which TDC method should i use??
01-05-2005, 07:56 PM
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which TDC method should i use?? i've got the straw method, which i dont want to do because i might have to take the headers off; or i have the dot method, were i turn the crank 90* and do the springs on the corrisponding pistons., which i dont want to do because of the uncertainty.
which method did you use/ should i use and why?
which method did you use/ should i use and why?
01-05-2005, 09:23 PM
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Originally Posted by LSONE
i've got the straw method, which i dont want to do because i might have to take the headers off; or i have the dot method, were i turn the crank 90* and do the springs on the corrisponding pistons., which i dont want to do because of the uncertainty.
which method did you use/ should i use and why?
which method did you use/ should i use and why?
I used a 6 or 7 inch length of rubber tube. Thick enough so that I could feel the piston clamp down on it.
01-05-2005, 09:43 PM
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The dots are on the timing gears. When the dot on the crank gear is at 12:00 then either #1 or #6 is at TDC. You can poke a straw into the spark plug hole in #1 to determine which cylinder is up.
01-05-2005, 11:43 PM
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could also use a leakdown tester to find where tdc is, only have to do 4 pistons if somebody had a map(ls1howto.com ??) of which 2 were up at the same time it would be easy, for instance inject air into pistons 1,3,2,4 and find the corresponding pistons that are up with these ones make the marks on the crank and every time from there on out would be easy. I have used the dot method before and don't worry the valves wont fall far at all if the piston is at TDC.
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i need one though
01-06-2005, 01:50 AM
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Originally Posted by Bluehawk27
I just put a mark on my crank bolt with a black magic marker and rotated it like that. There is no uncertainty in that.
when it comes time to change the springs. No need to take the headers off unless you have some strange headers that don't allow you to change plugs. That would be ludicrious. I don't like the straw. I used it and it was flimsy. I couldn't really feel it clamp. I had the "dotss" for backup but I was experimenting, exploring etc. I will upgrade to rubber hose next time to find TDC on the first pair and then just go 90 degrees on each step.
