TDC question

[spooldup]

Stupid question but i don't know the answer. While looking for tdc how do you know when you are on a compression stroke or an exhaust stroke?

 

[SY#2910]

Re: TDC question

Stupid question but i don't know the answer. While looking for tdc how do you know when you are on a compression stroke or an exhaust stroke?

Take out #1 spark plug (Front towards grill on the drivers side) and put your finger over the hole while turning over the engine a little at a time. You will feel it pushing air out while it is approching (0) on the timing mark.

 

[spooldup]

makes sense so i would imagine on the exhaust stroke you don't feel air when it's coming back up right?

 

[nightdiver]

or pull the Valve cover and see that the #1 rockers doesnt move when it comes to TDC

 

[SY#2910]

makes sense so i would imagine on the exhaust stroke you don't feel air when it's coming back up right?

Correct. Pressure on the compression stroke only.

 

[kentuc]

Remove distributor cap and see if rotor is coming up on #1 cylinder.This is used for tuning only.

 

[ItsMyTy]

the finger over plug hole is what I use
works every time

 

[#2875]

when attempting to start, mine wouldn't do shit but drain the battery when the rotor was 180 out. that's how i knew and that's the hard way. i had a 350 180 out and it started and ran.[/b]