Comments by "crazypj" (@1crazypj) on "TIMING CHAINS vs. BELTS - Differences, Evolution, History and more" video.

@somerandoonline5852 Some motorcycles have used gear reduction to chain drive. They use a 'hunting tooth. spring loaded narrow gear to prevent gear tooth chatter by keeping gears loaded at zero clearance. On Suzuki TL1000 motor it's also used on gear primary drive (around 130bhp, 1000cc V-twin) Drive gear is about 24mm wide and 'loading gear' about 8mm wide as it isn't transmitting power just keeping drive gear teeth 'tight'
4
@jeffreygoss8109 no they don't, you do the reduction at the crank and can use small gears with idlers. I'm a motorcycle tech and have a real good understanding of piston engines of all types. A generalisation, major manufacturer car motors have only 'caught up' with motorcycle designs in the last ~20 years (it took motorcycle engines around 50 years to use 'ancient' (1930's) aircraft engine technology.
3
Roller chains are generally far more reliable then Hy-Vo (silent chains) with about 98% efficiency. Belts are generally about 95% efficient BUT maintain that 95% to end of life. Roller chains have a lot of parts so wear can be an issue but having wear spread overt more parts can increase reliability. Roller chains deal with shock loads pretty good compared to Hy-Vo where plates bear directly onto pins as lubricant also acts as a 'cushion' On Hy-Vo chain I've seen the plates crack at one end and centrifuge from the remaining 'hole' end cutting tensioners and anything else close enough to pieces, pretty much destroying all internal bearings Honda have belt driven OHC industrial engines where belt runs inside sealed crankcase, oil cooled belt !!!
2
@ghoulbuster1 The truck that won Pikes Peak a few years ago had solenoid valve operation. It isn't too great for high rpm and needs a lot of electrical power to operate(high amps at 24~48 volts). There are large capacity low rpm diesels using it (truck engines, 12 liter, etc) I haven't done any searching for it for over 10 years but there is a fair bit of information available
2
@Luminous65 been done on motorcycles. The bevel gears need to be accurate but basically last longer than any other form of drive. VERY VERY expensive though and need some sort of coupling that can compensate for thermal expansion (more expense during manufacture)
1
@buildingracingvideos4714 Not only the noise, the cost WHEN the bearings in gear drive wore out. The early VFR's had so many issues I still hate all the V-4 Honda's except the VFR400 as it's the only one that didn't give me problems (but as we only ever sold 2 it may not be a good representation) The shaft drive V-45 is probably the worst of the lot for cam drive/head problems
1
@jamesflores9456 Just because I don't make video's doesn't mean I don't know anything about mechanical parts and how things work. Sometimes additional comments can help people understand things better. but may be too technical for some other people. These are really good video's, because I mainly 'do' motorcycles, even I have learned a few things from them as automotive production methods are usually for much higher volume needing some different methods of manufacture
1
@ArneChristianRosenfeldt Gears of different sizes act as idlers so overall ratio in a simple gear train remains constant. (compound gear train with have two gears of different sizes 'pinned' together on same shaft) If you put all the centres in line, the mesh changes dramatically due to thermal expansion, either too tight when cold or 'loose' when hot (chains and belts have same problem but spring/hydraulic tensioner compensates) Look up Suzuki Burgman scooter final drive, it has some interesting 'features' with a pretty weird 'V' section 'chain'/belt in the CVT ( I think DAF used similar in the 1970's?)
1