Matching Cylinders at TDC?? (90 Degree method)
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
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Axle/Gears: 3.08 10 Bolt
Matching Cylinders at TDC?? (90 Degree method)
I am doing a leakdown on a build while its on the stand and would like to know what the PAIR TDC cylinders are.
My valvetrain is not in yet (minus the valves and springs) so I just need to know what cylinders will be at TDC with eachother.
IIRC #1 and #4 are???
This is what I want to do...minus the whole firing bit.
My valvetrain is not in yet (minus the valves and springs) so I just need to know what cylinders will be at TDC with eachother.
IIRC #1 and #4 are???
This is what I want to do...minus the whole firing bit.
To make it easier on yourself, make 4 marks on your balancer at 0, 90, 180 and 270 degrees. Turn the engine over to TDC and look at the position of the distributor rotor. If it's pointing at the #1 terminal, then you're at #1 TDC firing, and the #1 valves are both closed. If it's pointing to the #6 terminal, then you're at #6 TDC firing, and the #6 valves are both closed. Then turn the engine over to the next mark on the balancer, and lash the next cylinder in the firing order. If you started with #1, it's 1-8-4-3-6-5-7-2. If you started with #6, it's 6-5-7-2-1-8-4-3. Continue until you've done all 8 cylinders.
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Re: Matching Cylinders at TDC?? (90 Degree method)
1 8 4 3 6 5 7 2, pair them up:
1 8 4 3
6 5 7 2
1 & 6, 8 & 5, ...
Cylinders 1 8 4 3 fire on the first rotation, then 6 5 7 2 fire on the next rotation.
RBob.
1 8 4 3
6 5 7 2
1 & 6, 8 & 5, ...
Cylinders 1 8 4 3 fire on the first rotation, then 6 5 7 2 fire on the next rotation.
RBob.
Thread Starter
Supreme Member
Joined: Oct 2001
Posts: 3,155
Likes: 2
From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Re: Matching Cylinders at TDC?? (90 Degree method)
Thanks RBob. So to recap for myself and those searching:
At 0* 1 & 6 will be at TDC. 90* out will then have 5 & 8 at TDC, then 180* 4 & 7, and finally at 270* 2 & 3 will be at TDC.
At 0* 1 & 6 will be at TDC. 90* out will then have 5 & 8 at TDC, then 180* 4 & 7, and finally at 270* 2 & 3 will be at TDC.
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