Quote:
Originally Posted by "QUICK-SILVER"
Was fixing vacuum leaks the only contributing factor for the temp swing?
If so, I'd have to guess the vacuum advance is hooked to a full time source.
Now if that's true, the big temp swing would indicate your base timing and mechanical advance aren't right for the combination of engine parts you're running.
That's all a 'BIG IF' run time, ambient temps, engine RPM, etc., were the same.
If base timing is too low and/or not enough mechanical advance for the RPM's...it does make engine's run hotter than they should.
Just thinking out loud
Clay
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It did run cooler after I fixed the vacuum leaks and replaced the vacuum advance, so it looks like they were definitely a contributing factor. The advance is hooked up to manifold vacuum with advice from a very reliable source. Paul Carter aka "GTOFREAK" helped me with the entire recipe and machine work for the build and again with the timing and air/fuel mix. The base timing is 14 advancing to 30 I think. The mechanical was re-curved and set up without the vacuum advance hooked up although we didn't realize that the transmission hose was unplugged so the air/fuel mix and idle need some readjusting. It was just idling in the garage yesterday but last week it was idling at 230 degrees. I have to get it out on the street and check the temp to be sure.