Comments by "Makan Tahi" (@makantahi3731) on "driving 4 answers" channel.

  1. then donate some money to be legal
    47
  2. request money back
    36
  3. so the most efficient cylinder heads have no spark plugs(diesel)
    29
  4. i would not agree with you , i saw many cast iron manifold cracked , and cast iron manifold has ticker walls that is not good because difference in temperature that causes stress in material. i had long tube header and because i floored it is burnt and melted but not cracked on welds
    15
  5. it can be monitored on 2 ways: 1. burning efficiency-higher pressure, higher efficiency, and 2. expansion efficiency: as nearer to atmospheric pressure/temperature as more efficient, so max eff will be if both are high: high pressure on the end of compression(start of combustion) and longest/expansion to the lowest temp/press on the end of expansion stroke
    12
  6. it uses fuel too, it would be better to have coolant heater on ac220v and plug it in 15 minutes before drive(i made one from caffe machine, it has 2 heaters with 2x1400w and it heats up big engine very fast, 30seconds for 1 deg of C)
    8
  7.  @zipsuma6971  i do not drive normally, my summer tires last 25000km and then are slick
    6
  8.  @tijljappens7953  on any kind of jet engine, only place where gas is faster than speed of sound is exhaust, but because that gas is hot, it has high speed of sound so maybe on some aircraft , at supersonic flight, hot gas does not need to be on supersonic speed because of itself hot temperature it still is more faster than true airspeed of ac(for ex Ma1 for air at 15C deg is 1200km/h but for gas at 800C deg it is at 2370km/h) sa exhaust gas at 800C deg, can flow through nozzle at 2300km/h and it is still below Ma 1
    5
  9. i do not agree with you: 1. 02:47, you said that puls travels with local speed of sound what is 1400km/h, that means that temperature inside of exaust is 101c deg, what is very wrong, when engine works, after few minutes even if outside is polar coldness, it reaches temps over 300c deg, so speed of sound would be 1732km/h 2. i first part you explain how it works on single piston engine, but is more important how it interact on more piston engine 3. you chose wrong way to explain this topic, you should speak about volume of gases that leave cylinder , enters into primar tube and make low pressure behind when ex/valve closes and makes suction in collector in other primar tubes, x pipe would not even mention
    5
  10.  @igornoga5362  do not turn sew upside down, , speed of sound is equal to 20.1 times second root of termodinamical temperature of gas, , so if gas flows faster than 2582km/h with temperature of 1000c deg, i flows faster than sound
    5
  11.  @d4a  that is right except one thing wall ticknes is problem , more tick, makes stress when heats up, because inner part is warmer , outside is colder, can not be heated up simultaneously, but if is thin , it heats up imediately
    4
  12. it is interesting when have to buy 16 spark plugs and to replace it
    3
  13.  @martinsvensson6884  thanks, i invested some 30 euros in this project: 2 dolce gusto caffe machines-used "broken", but if i wanted to repair it i had just to clean scale, but i just needed heaters, i bought good water pump on 12v and 2 relays, that device is remote, i just pull off hose from expansion bottle on car and connect that device on and it starts to circulate coolant, every heater has its own cable so i can choose one or both to work because each must be connected on different plug because fuses are mostly on 15 amps and it could drain more, i use it on big engine(5.7) if outside temp is below 15 c (one) and if temp is below 0c /both)whatever , in 30 minutes engine has temperature of50 c , on second car with small engine i made permanent system with 4 diesel heaters that help to heat up coolant when engine is started, they drain 70amps, and speeds up switching from petrol to lpg for 30-50%
    3
  14. big ship engines has upper connecting rod that moves just up/down, and lower rod moves as in car engine
    3
  15. al connecting rods are used in rc 2 stroke glow engines, it rotates at 20000rpm
    3
  16. no, marginal gain
    3
  17. that is speed/velocity efficiency
    2
  18. yes, first is motocycle engine, second is car/truck engine
    2
  19.  @KinZZi  you both are right
    2
  20. i work with epoxy and i was curious is any other result then no cf connecting rod, koenigssegg told they tested titanium but they returned to steel
    2
  21.  @20somthingrealestate  what is your point, what is nonsense, what biography i mentioned, i did not tell that compression is same as a/f ratio , maybe you missed some lessons in school?
    2
  22.  @20somthingrealestate  20:1 is overall a/f in diesel engine, did not know?, it works with lot of air, so exhaust gas is colder than from petrol engine, all my notes have point with video because video is incomplete, it explain only one smaller part of exhaust flow, so you should educate yourself , because your knowledge about this topic is more incomplete than this video
    2
  23.  @20somthingrealestate  you speak about race diesel engine? who drives diesel as petrol,btw,800 f is about 420 c, and you think it is big deal,petrol engine has that temperature on idle,if we speak about highly modified tuned diesel engine,take a look on gale banks channel,he made ultimate engine that works with 14:1 a/ f ratio at top power, so diesels for general use have half exh temperature of petrol engines for same powre rating and way of use,and second btw do not tell me to learn english because if try to speak in my language,you would sound like bigger ignoramus than you are
    2
  24. 6:33 you skipped diffusor, where air slows down and stabilize before enters into combustion chamber
    2
  25. 6:53 wrong, no increase in pressure, highest pressure is in diffusor, after that pressure is dropping otherwise you will have surge
    2
  26. have you tested the oem exhaust with your . I deal with aircraft models with 2-stroke glow engines, 4ccm and I was thinking about a different exhaust with an exhaust valve that would limit the flow of exhaust gases as a function of efficiency: I noticed that with the oem exhaust the engine consumes a lot of fuel in all modes, especially at idle up to 50 % of power, so I put a 2-3 cm long pipe with a smaller diameter on the exhaust opening, and with that I significantly reduced fuel consumption at lower powers, but I also limited the max power by 20%, so it would be good to have a valve that would open at full throttle
    2
  27. 4:07 yes, rotor speeds up air(static p falls, dynamic rises,) and stator slows down air(static rises , dynamic falls) and overall pressure rises
    2
  28. ai20d engine on an32 has single shaft turboprop and to start up it is heavy job
    2
  29.  @bennyz1971  but on idle, even with higher cr, in combustion chamber is small amount of mixture so pressures on tdc will not be too high, big stress on engine will start on low rpm and wide open throttle(high pressure on tdc and low oil press because low rpm)
    2
  30. can you compare 2S/4S diesel engines, it seams that 2S diesel has less disadvantages to 4S diesel than 2S petrol to 4S petrol engines
    2
  31. what about overheating engine
    2
  32. 8:56 older engines have that temperature, last 20-30 years on modern engines that is between 1200-1800C
    2
  33. what did you work on aircraft?, there are 2 magnetos, each gives spark on one plug on each cylinder , so if one die, other gives spark on second plug, there is ground engine check-magneto check where at some higher rpm , unplug one magneto and rpm must drops for some rpm(200) both magnetos are checked
    2
  34.  @StupidBlokeStupidVideos  you are wrong ,both magnetos have same timing and it is better combustion with 2 spark plugs than with one
    2
  35. 5:50 wrong again, with 3 stages of axial compressor you can not get 70PSI, because 1 stage can gain only up to 20%, you should have 7-10 stages or centrifugal compressor
    2
  36. ok then you make riding videos,
    1
  37. 8:21 jet engine rpm is specified by speed of sound on compressor blades, smaller engine can have more rpm
    1
  38. they should made big bore ,short stroke(like f1 engine) and they would had space for bigger valves
    1
  39. and geared-alf on bea146
    1
  40. nice for knowledge refreshment
    1
  41. yes
    1
  42. video is the best you can get in 14 minutes
    1
  43. same thing with škoda felicia: mk1 has aluminium thermostat housing but mk2 has plastic, (in time when škoda started to make mk2 , vw overtook škoda)
    1
  44. 32:28 meho pali, gasi meho, gasi
    1
  45. 7:12 something like zastava 101 with good engine and better finishing
    1
  46. pure abs just prevents wheel from locking, in combination with stability and traction control it can use bakes to direct car in desired direction(where is steering wheel pointed) or prevent any wheel to burn rubber, braking system uses underpressure from intake manifold to bust brake power,
    1
  47. who cares, my uses 20litres of lpg and i floor it when and where is possible
    1
  48. 3:50 yes it can be ignited two times, that was told in chrysler: first time to burn most of fuel mixture, second time in exhaust stroke to ignite and burn rest of unburned fuel mixture, that is why 2005. 300c 5.7 has 2 spark plugs, but it can be rearranged to give spark at same time, and that has 1% better fuel economy
    1
  49.  @d4a  ma di si jarane!
    1
  50.  @bicylindrico  yes, but i reconnected it to be twin spark
    1
  51. easy to understand!
    1
  52. 13:40 because people are stupid
    1
  53. da bi ga zadriftao s gasom treba raditi : davati oduzimati tako da se težište prebacuje nazad naprijed, kad ode naprjed dati više gasa i okrenuti volan i to je to,
    1
  54. invented/diesel
    1
  55. it would be easier to set waste gate on compressor side
    1
  56. first, at same gear ratios, toque is same but in real world if you have big load on gears is better to have bigger or wider gears to to ensure sustainable pressure between teeth of gears or have more teeth in engagement to reduce load per teeth second for petrol engines if assume that it works at fixed a/f ratio, more fuel is injected as engine speed up at WOT, because raises cylinder fill up with mixture because of higher speed of air that travels through engine(up to max torque rpm, after that mass flow of mixture decreases per cylinder per cycle, but mixture starts to be richer and then efficiency falls down, but power raises up to rpm of max power)
    1
  57. it is theoretical difference, engine masters played with many long tube headers and some they bashed as would be in real life, it had dents and no difference on dyno
    1
  58. yes but this can be explained on other way, for same fuel flow, you can get small thrust with/for high speed or lot of thrust with/for low speed
    1
  59. dobra fora, a da li ima izmjenjivać topline ulje-antifriz, jer uvjek se prije ugrije antifriz nego ulje
    1
  60.  @driverjamescopeland  it is not matter are ground or aero turbine, you can not make turbine blade thick as brick with no cooling and think it can go on higher temps, it will melt down few minutes later in compare to thin blades, it is up to material that can hold temps with or without cooling, btw ground turbines are not made for thrust, so turbine must take all possible power from gas, on aircraft not, some energy must be left for propulsion
    1
  61. 6:44 spark plugs are used only for starting up(and in bad weather conditions to prevent flame out)
    1
  62. make videos how you modify your car
    1
  63. it looks that you sleep with this header
    1
  64. because fluid has more energy, better charging of cylinder, more mixing of a/f
    1
  65. very good graphics!
    1
  66. no, jet engines of any kind make no reactive momentum like piston engines
    1
  67.  @harrysummers9858  it is written that way in every professional literature, i can not check it by keeping engine in hand to feel stability and precession
    1
  68.  @harrysummers9858  maybe not at all because n1 andn2 spool have different mass and speed
    1
  69. on turbo car, difference would not be big, because turbo makes pressure
    1
  70. jarane, šta nisi rekao da si iz bugarske
    1
  71. 11:28 because people are stupid
    1
  72. I have auto gas installed on the MPI engine, which in the end comes to the same thing for the intake valve. but the intake valve is not dirty because it does not suck air from the engine housing and there is no EGR
    1
  73. 15:02 you could have piston engine to propel something like fan on high altitude but for same power rating, jet engine is multiple times lighter, a400 has 4 turboprop engines with 10000hp each, how much would weight the lightest piston engine with same power?
    1
  74. will see
    1
  75. on te kuži ali se pravi englez, ne odgovara jaranima na balkanski
    1
  76. i knew/know diesels are dirty
    1
  77.  @d4a  mostly, people with stock car does not races, but i saw many cast iron collectors cracked, maybe because there are plenty, if you try to weld cast iron you have to preheat it slowly, to avoid big differences in temperatures in material, and big collector on truck is not loaded by temperature as on petrol engine, because it has lower ex temperature because diesels work with plenty of air, more than 20:1
    1
  78.  @morpheus_9  i see you are specialized in spewing bullshits , listen to me , you bullshits specialist with limited knowledge: do you know why if mixture is lean exhaust gasses have hotter temp , if you know, you should not mentioned it , in petrol engine , lean mixture has extended time of combustion , what means it still burns in exhaust, next fact that you do not know is that in diesel engine, locally mixture is rich but overall is lean because diesel engine works with excess of air , so that is why same power rating diesel engine at same power has less temp of exhaust, next thing that you do not know is when petrol engine has best power: it is when combusted gasses in cylinder have the highest temperature because best/the highest mean indicated pressure is on the highest temperature in cylinder, and that is at rich mixture, but why rich, not stoichiometric?, because petrol falls apart due to dissociation of some amount of fuel, so need to be some more fuel , and a little richer mixture prevents knock, so in this comment is more new facts for you than you know at all,
    1
  79.  @changsangma1915  you are right, english language is problem because i am not natural english speaker and it is hard to explain something to people that think they know much, but they do not know much, but they speak english language good, so we can do it on 2 ways, 1. get use on broken/international english or 2.we can discuss in my language, so you could learn my language or you could use google translator, but in both cases , you would soon realized that my broken english is not so much broken as would be your attempt to speak in my language, if you wanna try, ask me in english i will answer in croatian. Next thing , what skills you have that you can recognize if somebody is engineer or not, i can , because after all i wrote just in this comment on comment reply, you did not recognize misconceptions and shallow knowledge guys that discussed with me, so maybe you and they are engineers but not for engines, cars, materials and technology, (they are maybe cheefs, cowboys or just regular guys that like cars but do not have wide theoretical and practical knowledge about things they like), ok, i am waiting for your question, to see how it will go
    1
  80.  @d4a  it is not accurate engine model
    1
  81. they were the first to think outside the box, until then only solid fan blades were used, which brought into question the increase in fan diameter due to the large centrifugal forces due to the large mass of the blades
    1
  82. nice, but: 1. the outer tire should not slide on the rim 2. the valve does not serve to keep the inner tube in place when you apply these two things, it almost doesn't matter where the nuts are, the important thing is that the lower nut is tight enough so that air does not pass between the tire and the valve, and the upper nut serves to prevent the lower one from loosening, and it's even better if both are outside because the inner tire would have to fill the space because of the nuts that are inside the tire, so it would have to stretch and deform around the valve. Otherwise, damage to the inner tire on bicycles is caused by the rough surface of the outer tire. tip: use tubeless
    1
  83. engines maximal fuel flow per minute is in 2. gear on WOT when accelerating toward max rpm
    1
  84. a little more east,
    1
  85.  @TiagoAlmeidalive  more east, 1800km from spain
    1
  86. 9:41 wrong, primary air is used for beginning of combustion, secondary air is for optimization of air/fuel mixture to prevent too rich and to insulate combustor walls if high temps, and third zone is to finish combustion and insulation, and as much air is in 2. and 3. zones, as temperature is lower
    1
  87. 6:00 because people are stupid
    1
  88. 6:15 compresso stall/surge is because air stream pitch over compressor blades is too high
    1
  89. 8:28 not completely right: at compressor stall/surge , in the worst cases , flames can go out through compressor and you can hear bangs, on yt is many videos where passengers recorded that
    1
  90. to fly you need thrust, to have thrust you need speed difference between exhaust and local air, if you wanna be effective that difference must be minimal, so, if exhaust speed is high, that engine will be more efficient on higher speeds, but over 3Ma ram effect is so strong that you do not need compressor.........
    1
  91. yes
    1
  92. super je za po gradu ali na autoputu je živa dosada jer jedva gmižu, prošao sam 1-2 tesle od rijeke do zagreba sa barem 100km/h razlike(u mojem v8 ameru)
    1
  93. jarane, za ovaj video imam neke repove jer raja nema blage veze ili zna nešto malo o temi ali im ide engleski pa moj tarzan engleski doživljavaju kao da sam iz prašume
    1
  94. i u bosni je vruče
    1
  95. 2:28 brojke i slova, to već znamo
    1
  96. how
    1
  97. when you mentioned bicycle brakes: some guys tested same bikes, only difference was: one had wheel cable brake and other hydro disc brakes, and what you think which bike had less braking distance, of course, disc brake, why because in first second of braking, hydro brake makes more braking force than cable brake because inner and outer cables are stretching and act as spring but when it reaches full power on both bikes front wheel can be locked.
    1
  98. 14:00 on glow 2S engines(rc aircraft) a/f mix comes through hollow shaft that has hole on one position so it does not need one way valve
    1
  99. no it is god work🤣🤣🤣🤣🤣🤣
    1
  100. it seams your engine has many restrictions in intake and exhaust, take a look on gale banks channel-"boost gauge is dead for me",
    1
  101. morao sam se napiti da te gledam u tesli
    1
  102. because piston engines make power, jet engines make thrust, power is thrust times speed, so if jet airplane is not moving it makes 0 power but can make thrust
    1
  103. 15:40 never again, my aisi304 rusted under wrap because it collected salt from road
    1
  104. no
    1
  105. 7: 50 škoda favorit was 960kg
    1
  106. what torque? on turboprop?
    1
  107. 0:29 izgleda ko kulenova seka
    1
  108. no, modern jet engines have systems that prevents stall/surge
    1
  109. on my v8 every 90 deg is combustion, so i have combustion in every moment
    1
  110. 2 stroke glow engines have low efficiency, particularly at low rpm
    1
  111. no, no
    1
  112. živio auto plin
    1
  113. only for forced induction engine, for n/a no difference, i have lpg with 104ROn and had to increase timing to prevent valve burn, but no power gain
    1
  114.  @dlb83082  yes, unnoticeable gain
    1
  115.  @dlb83082  at 250km/h i was switching between petrol and lpg, no difference , no faster no slower
    1
  116.  @dlb83082  good for you, i tested my car before and after tuning, same time 0-60, 5.9 sec, more noticeable difference is with outside temperature, day/night
    1
  117.  @dlb83082  yeah, i know that, that is why i made tune by spark plug advance, because to compensate higher octane number of lpg, it is overheated by coolant in evaporator, although lpg evaporates below 0 deg of C , i drove car with lpg vapour temp at 25 C deg and everything was ok
    1
  118. 9:04 at start up procedure if timing is wrong from some reason , it can happen hot start, or slow rpm rise, because is too much or too little fuel , too early or too late and then pressure in combustion chamber can be near or above compressor pressure
    1
  119. on light airplanes, that are powered, by 4/6 cy piston boxer engines, difference in rpm are about 200 between 1 and 2 spark plug working(magneto check)
    1
  120. rc aircraft/car glow/nitro engines produces 1hp from 4ccm at 18000rpm
    1
  121. what engine/airplane of nazi had turbo fan ?
    1
  122. depends on amount of used fuel, older engines were weak and not big fuel flow
    1
  123. hottest air is on higher altitude, that is why is up, not down , because is lighter, if you take 1 cubic meter of air from 12km in sealed syringe, on sea level it would have less volume and higher temperature than local air on sea level
    1
  124.  @ehb403  on meteorology lesson, teacher confirm me that what i said, it is basic principle, lighter gas goes higher, so air must be warmer to go higher,
    1
  125.  @gort8203  why that air would have less dense(what forces that air to have less dense in compare to air on sea level)
    1
  126.  @NavyVet4955  you think that because you do not understand fluid thermodynamics, explain why that air has less dense(gravity is almost the same as on sea level, so what left?
    1
  127.  @NavyVet4955  you are attempting to sound intelligent, mentioning it, ok, you have deep lake, where is warmer water, on bottom or near surface, , i am guessing you can not grasp how density changes by temperature😂
    1
  128. 7:20 it is possible on lpg on cars with carburetor, just turn off lpg leave it in gear and engine is rotating and does not use fuel
    1
  129. lpg has 104 RON
    1
  130. 4:49 no, wrong, inlet guide vanes can not protect from any foreign object
    1
  131.  @d4a  no, no, energy of any sucked object will damage inlet guide vanes, if engine is bigger, inlet is bigger so it could suck brick , so if you will have cage strong enough to stop brick, it should be made from steel bars 1 inch thick, but brick would fall apart so again no use, my suggest to you to stay on topic you are good, jet engines are wide area and you should study it a little more 😀(mentour pilot channel in one video explained that if you do not believe me)😀
    1
  132. very well
    1
  133. could you do a dyno test of that motorcycle with this exhaust and the exhaust as if it were a 4 stroke engine
    1
  134. no any word about compression ratio difference(0.1), skoda felicia has 1.3 engine with 42 and 46kw, only difference is in compression ratio that is achieved by grooves on piston , bigger groove is on engine with less compression ratio and less power
    1
  135. usually you are well prepared for topic but this time you missed some facts: 1.bigger disc usually needs bigger caliper that has bigger pistons or more of it. so it can make higher braking force. 2.brake on stock car can not make braking force that could lock wheels at high speed for first few seconds, it has no such power to do it, bigger brakes could and then overtakes abs and it means that bigger brakes shortens braking distance 3.yes , there is that famous formula, but except all you said , more important thing why wider tire gives higher friction force is shape of contact area: narrow tire has long track pattern (contact area) where is bad distribution of pressure on contact surface, wider tire has wider track pattern that has better distribution of pressure(or more even pressure over whole contact area). so when you start to brake hard, narrow tire can not take more pressure that comes with inertial movement, but wider tire has more capacity to take additional force/pressure on contact area before it exceed point where friction breaks( no more friction force by higher normal force), so that is why wider tire can produce higher friction force
    1
  136. in WORKING VOLUME in piston engine actions are in cycles in jet engines are continuous, that is official definition ,comply with it, it will be easier for you
    1
  137. 16:12 on this vehicle are front and rear wings, not a spoilers
    1
  138. test two cars: one "supercar" that has less braking distance and everyday car, for ex your aygo, thest them at :20/40/60/80/100 km/h panic braking and you will see that both cars have same stopping distance till some speed, after that aygo will have longer stopping distance
    1
  139.  @arcanevoid9199  no fade, test must be done in same condition for every speed and every car, no overheat, same temp
    1
  140.  @arcanevoid9199  did you?, where is distance for 20/40/60/80km/h
    1
  141. 10:40 i use it on bicycle and best air wake is on 2-3m behind , on 5 m irrelevant
    1
  142. this video is about stupid people
    1
  143. no
    1
  144. only if you have complete weight transfer to front wheels, if not, rear wheels push ground with some force so you waste its ability for braking
    1
  145. buy ev
    1
  146. for what, for special effects?,
    1
  147. it would be the best to install throttle body in front of compressor, no need for bov, and turbine keeps to rotate
    1
  148.  @DriftNick  thanks, but all screw/root superchargers have throttle body in front of s/c, and that seams better because it can be controlled how much of air will be sucked in and better efficiency because no air is wasted
    1
  149. in understeer you go on tangenta-straight, but on oversteer you go in some kind of cycloida, you still go in circle but you are rotating too
    1
  150. brake horse power- engine is connected with some kind of brake -and then measures force on brake for any rpm considering loss of braking, clear?
    1
  151. what, what?
    1
  152. 2:15 matters when it is overloaded
    1
  153. nothing new, on safe driving course, there was shown that for some steering wheel angle is only one speed that keeps same radius of corner/circle
    1
  154. 7:47 75% of turbine power is sending to compressor, so for thrust or free turbine is available 25%
    1
  155. nemoj ga baš hvatati za riječ, ima tu dosta polu netočnih stvari
    1
  156. problem with knock is on wot not on cruising
    1
  157.  @StupidBlokeStupidVideos  when i flew small aircraft , there were 2 magnetos, left and right, both are main and must be adjusted to work together
    1
  158.  @StupidBlokeStupidVideos  no, in video was told too, that there is no benefit if 2 plugs fire sparks with delay
    1
  159. 02:40 still not good, return it on first setting
    1
  160.  @d4a  yes it is not your fault
    1
  161. 12:00 maybe it happened to dino diy
    1
  162. ok, I forgive you everything
    1
  163. 18:00 napušten jna objekat
    1
  164. wrong : mean means a+b=c divided by 2
    1
  165. me too, i am just waiting for ss316 tubes
    1
  166.  @kaisertrinityt.m.i.s1607  ha ha, in my country even 1 single nut must not be replaced by some aftermarket without certificate that gave oem that guarantie it is good, so ofcourse, my long tube header will be on other side of law, but who cares if pay on annular check to pass
    1
  167.  @kaisertrinityt.m.i.s1607  some money came to me so i bought tig equipment, i practised and no big deal, easier than with shielded electrode, i calculated that whole exhaust plus tig welding machine will cost same or less than i ordered from "specialized" shop that make this
    1
  168.  @kaisertrinityt.m.i.s1607  on chanel burns headers, stainless steel, they adviced to use inconel but it is to expansive, second was AISI321 it is unavailable for me and third was AISI 316 that i can find but is double price than AISI304, 15€ per metre for 42.4mm diametre , 1.5 mm wall tickness, i have old header as template that was made with 40mm diametre tubes, that was to narrow, welds were made too rough, with no cone/spike in 4in1 collector, etc, and benefit was on rpm 2500-3500, after that it choked engine, so much that o2 sensor was bent inside of collector
    1
  169. I'm not really sure if only sound waves are at play here or pressure-underpressure impulses that also occur with long tube headers on 4-stroke engines, with the fact that they can also use only sound waves, but with a sharp so-called stepped transition, where the tube with a smaller diameter enters the pipe with a larger diameter without a smooth transition, thereby creating a reflective surface that reflects the sound wave towards the exhaust outlet, creating additional negative pressure
    1
  170. holy cow!!!!
    1
  171. you mean propeler with 2-8 blades in compare to fan with 50 blades-they are in cowl that slows down speed before fan, can be unducted fan with 20blades , clean blades make big noise
    1
  172. if you want something much more different, watch video about sr71 engines and how it works in depend of speed, 180deg opposed to normal jet, somebody was on heavy drugs to imagine that
    1
  173. good idea, now is time for that
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  174.  @igornoga5362  one lesson from aerodynamic, if you have ad tunel with smaller diametre,in middle and after expands,(venturi tube) and forces some gas(air) to flows , as raises pressure , speed raises , until pressure reachs 1 bar , in smaller diametre, speed reaches 1Ma, if pressure raises more, speed in smaller diametre is still 1 Ma, but in part of tunel where diametre expands, speed starts to raise over 1 Ma, so you have supersonic speed, same is in exh primar tubes, gasses from cylindre are under pressure and when exh valve opens it expands into primar tube or collector with supersonic speed, with no muffler you will hear bangs-what is supersonic expansion
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  175.  Snowman88  not density, speed of sound of air/gas is in direct relation with termodinamic temperature
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  176.  Snowman88  thanks , i remember a few things from highscool and one is that formula, shorter, speed of sound in m/s =20.1 times second root of temperature in Kelvins
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