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  Maybe not the heads?

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Author Topic:   Maybe not the heads?
'69PonyRider
Gearhead

Posts: 141
From: Hawthorne, CA
Registered: Sep 2001

posted 10-05-2002 02:33 AM     Click Here to See the Profile for '69PonyRider   Click Here to Email '69PonyRider     Edit/Delete Message   Reply w/Quote
Ok sorry i took so long to respond..but from my last post that my engine was overheating and you guys sudjested the head gaskets. I was going to do a compression test on the cylinders but i just did a vacuum test first, if the needle goes crazy that means something is wrong with the cylinders or somewhere in the heads right? well the needle stays at a steady 21 ?inches? of vacuum so i didnt bother checking the compression although I am curious to see what the results will be from that. But in regards to Pierre's curiosity, i didnt do the compression test. Question- If i have more vacuum is it better, or does it not matter? what does vacuum do for my engine?

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 10-05-2002 05:19 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Vaccum's level depend on how radical or stock your cam may be (the higher the reading the more stock it is). Stability is what you want. If the needle wanders it means trouble in the valve/valve train area (so you are OK and probably have a stock engine cam). It could also be a sign of a really weak cylinder I guess but this may not be the most accurate way to check it.
Just my humble 2 euros

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'69PonyRider
Gearhead

Posts: 141
From: Hawthorne, CA
Registered: Sep 2001

posted 10-05-2002 08:15 PM     Click Here to See the Profile for '69PonyRider   Click Here to Email '69PonyRider     Edit/Delete Message   Reply w/Quote
Ill do the compression test as well once i get around to it, i havent had much time to work on my car since i started school . but ill do it for sure and post the results so you guys can tell me how bad it is. or not.

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mustangboy
Gearhead

Posts: 670
From: Ont, Canada
Registered: Mar 2002

posted 10-06-2002 01:45 AM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
I'm not too confident with only vacuum reading results.My dads motorhome with a 454 Chebbie was blowing smoke out of the one side of his dual exhaust so I did a reading on it.It was around 25 inches and as steady as a rock.Did a compression check and he had two cylinders on the same bank with 0 compression.When we tore it down the rings and ring lands from the pistons were laying in the oil pan.

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