What you've been told is correct. TDC, for testing purposes, generally
refers to the top of the compression stroke. At this point both valves
are closed.
For what it's worth, there is another TDC, when the piston is at the top
of the exhaust stroke. In this case, the exhaust valve will be closing
(but partially open),and depending on the duration of the cam, the intake
valve will be starting to open
The two TDC's are 360 degrees apart.
Rick Morrison
72 MGBGT
74 Midget
On Fri, 27 Feb 1998 14:25:37 -0500 (EST) bk996@freenet.carleton.ca (Eric
R. Stephen) writes:
>************************************
>While we at this, can anyone describe to me how one determines when a
>cylinder is at TDC? I've been told that to get cylinder #1 at TDC I
>should remove the spark plug, insert my hand crank and crank until
>both
>valve 1 & 2 stop moving and the screw driver that I have "carefully"
>inserted into the plug hole stops rising. Is this correct? At
>TDC,should
>one valve be fully open and one fully closed? Pardon the question but
>I've got to learn somewhere. Hope it's not too much of a bother.
>
><snip>
>>Which cylinder is to be at TDC??
>>
>>Bill
>
>--
> ' ' ' Great is the truth and mighty above all
>things;
> ( o o ) It endureth and is always strong;
><---ooO---(_)---Ooo---> It liveth and conquereth for ever more.
>1960 MGA Roadster The more thou searchest, the more thou shalt
>marvel.
>
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