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Old 01-06-2006, 02:14 PM
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True TDC / using a piston stop


I have a SBC, 350, Edelbrock injection using a Mallory electronic distributor. Its in this car (Pictured). Clearly no room for a timing pointer here or viewing. Could I find TDC and mark the flywheel? I do have room there to view a mark. The issue of finding TDC is my next project. I think I understand how to use a piston stop however I am not sure using the flywheel will work. I don't see a reason it wont but I really would like to have another opinion. If I can, when using a piston stop aren't we really trying to find the middle of the float at TDC? Could someone explain the process?? You guys know timing is critical and with my Edelbrock EFI I have to get the base settings correct before I start tuning.. This thing is a hand full and craping out in traffic is a real pain (way to old to push) ..

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Old 01-06-2006, 02:22 PM
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IF you do establish TDC you can set the mark any place on the balancer or flywheel you want.

I remember timing an engine using marks on the flywheel.

Just make sure you clearly mark the chosen spots and that the marks will LAST.
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Old 01-06-2006, 02:55 PM
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Using the piston stop rotate the engine carefully !!!

Find something to use as a pointer. Does not matter where if making your own TDC mark so pick something strong and easy to see with a timing light.

Roll the engine tiill it hits the stop, make a mark at your pointer
Roll the engine in the opposite direction till it hits the stop, make a mark at your pointer.

EXACT TDC will be in the center of those 2 marks. You will not be able to roll the engnie there until removing the stop.

The reason you have to stop the piston before TDC is that the crank rotates a few degrees while the piston is stationary at TDC. So you cant just run the piston up top and set it.

Same with finding a cam lobe centerline. the cam rotates a few degrees with the lifter all the way up top.

Last edited by Infomaniac; 01-06-2006 at 03:02 PM.
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Old 01-06-2006, 02:58 PM
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Then use a timing light that has an adjustable advance to check your ignition timing once you have given the computer it's ref.
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Old 01-06-2006, 03:31 PM
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Yes, but if you're marking the back-side (clutch-facing side) of the flywheel, and planning on using the edge of your bell housing as reference, it would be good to mark both sides of the flywheel at TCD. That way, if the (driver's side) mark is hidden (up inside the bell housing) at your timing light's advance setting on one side, at least you'll be able to see something on the opposite (passenger) side.

BTW -- Congratulations on getting the Chevy into the 914. I've never seen that before. Ive heard of Buick 215 Aluminum V8s, and Small Block Fords are pretty small, so probably also doable, but the SBC looks like a monster in there!!

Pat
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Old 01-06-2006, 05:26 PM
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You guys are the best!
The car is a blast to drive, but to make things work correctly I just have to get this timing issue behind me.. The car is a load at wot..
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Old 01-07-2006, 12:44 AM
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Might have to make a pointer underneath if you can see better that way.
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