I searched TDC and TOP DEAD CENTER and came up with nothing close to what pertains to my situation. I had my new engine at TDC(or what i thought was TDC) with the crank sproket lined up with the mark on the oil pump AS WELL as I put my finger in the 1 cyl spark plug hole and at the end of feeling compression on my finger the piston was to be at TDC...Well i put marks on the crank pully and cam gear. I primed my new turbo and then tryed to put cyl one back at TDC. Well now when i rotate the engine and i get done with the compression stroke my marks dont line up....
TDC is after the compression stroke, correct? Is there another method to determine this???
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The purpose of ignition advance is to account for the lag time following spark ignition for combustion pressure to peak at 15 degrees AFTER TOP DEAD CENTER. A little fyi !
I searched TDC and TOP DEAD CENTER and came up with nothing close to what pertains to my situation. I had my new engine at TDC(or what i thought was TDC) with the crank sproket lined up with the mark on the oil pump AS WELL as I put my finger in the 1 cyl spark plug hole and at the end of feeling compression on my finger the piston was to be at TDC...Well i put marks on the crank pully and cam gear. I primed my new turbo and then tryed to put cyl one back at TDC. Well now when i rotate the engine and i get done with the compression stroke my marks dont line up....
TDC is after the compression stroke, correct? Is there another method to determine this???
turn it over a couple more times remember that piston is up there twice in one full crank revalution, exhaust and compression stroke you are probibly on the exhaust stroke
But you would agree that as soon as the compression stroke is over i should stop feeling pressure on my finger right? I was putting a stray in the plug slot and resting it on top of the piston that way i know exactly when its at the top...
But you would agree that as soon as the compression stroke is over i should stop feeling pressure on my finger right? I was putting a stray in the plug slot and resting it on top of the piston that way i know exactly when its at the top...
idk never stuck my finger in that hole
i know i need to spin the crank 4 times so all marks lign up
Well i was going to borrow DCR's cam setting tool from a local and got to talking about what i really need for it and decieded i didnt need it...He walled his dad(a local guru with engines) and he stated just get the #1 piston at the top of the cyl and the sensors cam and crank sensor will figure it out??? That doesnt make sense to me.
Not sure what you're trying to ask here. If cyl #1 is at tdc and you cam timing marks are lined up you should be good to go, and yes, that would be the compression stroke.
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You know, Brian, it occurs to me that this is like a Greek tragedy where a man must choose between himself and his children. Of course, you'll be playing the role of "Sans Testaclese."
at any time when you do cams/timing belt. initially you have the engine at tdc and the cams at tdc. to ensure your car both the block and cams are at tdc you rotate the crank clockwise twice and line up the marks on the second rotation. that is done to complete a full stroke..
if you rotate the crank once and try to line it up it wont line up. you have to turn it one more time and check your marks on the pump/gears. . you can watch the cam lobes open the valves and close valves as you complete a stroke. as long as you follow the turn crank twice check timing and your lined up your good to go.
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DBB 50Trim devilsown and diablosport with a few supporting mods
Last edited by GreaseMonkey69 : 08-27-2009 at 11:47 AM.
As long as you are lining up your marks there is no reason to worry about where the piston ends up. I believe your are over thinking it. Line up your marks and rotate the engine several times and check to ensure that they line back up. If you cannot get them line up after several attempts at rotating the engine then your out of time and you need to reset the timing belt. The marks are all you need to tell you if your TDC.
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Well i was going to borrow DCR's cam setting tool from a local and got to talking about what i really need for it and decieded i didnt need it...He walled his dad(a local guru with engines) and he stated just get the #1 piston at the top of the cyl and the sensors cam and crank sensor will figure it out??? That doesnt make sense to me.
Is it not at the top of the compression stroke?
yup you can log or do it real time by hand the cam/crank angle, i dont know exactly what parameters tp look at but if you open setup<sensors<cam/crank sensor<<advanced cam/crank<advanced pickups. the parameters screen will pop up you would just need to know what teeth to look for, to log i assume you would need the internal log on high speed
your just nervous and kinda weary of the way you did it. its all good man. all the guys who posted in here are putting you in the right track. your doing everything right like you said don't over think it.
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