Comments by "802 Garage" (@802Garage) on "driving 4 answers"
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eksine You really have absolutely no idea what you are talking about. First, factory bushings are typically 40-70 Shore A. He chose 60 Shore A. So while it is stiffer than a lot of factory mounts due to being solid, it is actually softer than most aftermarket mounts which are often 80 Shore A or even more. Second, this is the exact same material used by aftermarket companies to make mounts. What differs is the process of pouring and forming. Making mounts like this is literally a recommended use by the product manufacturer. Third, there is a huge difference between a Urethane rubber, as used here, and a Urethane resin, as used on skateboards. Lastly, RTV would be a terrible choice for this application. not only is it too soft, but it has a much lower tear rating than this material and would not hold up to twisting and pulling. If you actually looked up the specifications of the product, you would know that. And not to mention, the whole point of RTV is that it can dry without the presence of a lot of air. Literally everything you said is inaccurate.
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I just thought about something, more than before at least, that I have heard nobody discuss. How valves overlap effects your effective compression ratio. Now I know the Atkinson cycle takes advantage of this of course, but basically, you could have a super high compression ratio engine that has a low effective compression ratio if a valve is open for a significant portion of the compression stroke. So really, when people build an engine for a certain CR, if that isn't taken into account, they could be way off. Obviously it still has to be tuned however it needs to, but this is still significant. Am I missing something or overthinking? Why isn't this talked about more? I obviously knew this was a factor, just hadn't thought deeply, and rarely see it mentioned.
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eksine I never said RTV wouldn't work, I said it is not the correct material for this. I even spoke of specific reasons, two of the biggest ones being the stiffness and the tearing strength. Polyurethane is one correct material.
The fact that you had to look up the idea is exactly why you were full of shit, because you were talking out of your ass mate, you stated it like you knew better, but you didn't.
You can use any number of materials for this, but the one he chose is correct and superior to RTV for the job. People have used window sealants and gasket makers all the time, doesn't mean it is ideal, and the rest of what you said is still nonsense.
You are proving nothing except that you can Google something you previously knew nothing about and I already knew.
For $25 you can buy the correct materials, it will smell less, it will cure properly without special care, and will last longer.
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