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Topic: timing and overheating

in Forum: C3 Engines

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timing and overheating (1/3)
11/6/11 6:18pm

theycallmered
Former Member
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, - Australia

Vette(s):
Second-month production Shark, this 1968E was built up by original owner into 1969 ZR1 (L88 body with LT1 engine) for Club Racing. Body styling is from Maglioli's 1968 L88 "Le Mans" racer

Joined: 10/27/2010
Posts: 54

I'll try not to overcomplicate this:

Thought I had my LT1 including Holley 4555 idling nicely with 10 static advance, and no apparent overheating (temp sender not hooked up, but also with just a bit of overflow of coolant, such as overfilling the catch tank).

Realised I hadn't disconnnected/plugged the vac advance canister when setting static timing.

Do so, and now static timing is retarded substantially. No worries, fix that right up.

Can only get it to 4 degrees static now because of dizzie interference, but it idles smoothly at 800 rpm. Hook the vac hose back up to the dizzie, advance increases; turn down idle speed again, shut it down.

Then it overflows big time from the catch tank.

Thoughts? Dizzie is hei.

Thanks in advance.

|UPDATED|11/6/2011 3:18:19 PM (AZT)|/UPDATED|

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1968E (2nd month production) convertible first registered California 1967 and a retired SCCA race car. It is still race prepped and built up as a '69 ZR1 (announced '69 but not built until '70); i.e., the L88 car with LT1 motor.

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Re: timing and overheating (2/3)
11/6/11 8:46pm

F4Gary

Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1409

I think I timed my LT-1 to 16-18 BTDC with the vacuum plugged. I'm using straight vacuum, not ported. I used to have overheating probs especially with the a/c on. Cured that with a DeWitt's aluminum radiator.

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Re: timing and overheating (3/3)
11/6/11 10:03pm

Thanks for that; I believe I'm using ported vacuum (the tube at the front of the Holley's base).

______________
1968E (2nd month production) convertible first registered California 1967 and a retired SCCA race car. It is still race prepped and built up as a '69 ZR1 (announced '69 but not built until '70); i.e., the L88 car with LT1 motor.

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