Hi All!
I re-did the compression check last night (the right way - last year I
didn't turn the engine over enough) and I also hooked up a pressure
guage. I got 125 lbs in 1,2, and 3, and 120 in 4. The engine has
125K miles without a head rebuild. It also has a hot street cam.
The pressure guage did indeed fluctuate! I have another engine which
I am working on a rebuild because I know that this one is only getting
worse!
I did find that by pinching off the vaccuume hose I was able to steady
the fluctuations, but still get vaccuume. Essentially, a small hole
acts like a low pass filter.
I think I'll step up my efforts on the rebuild to put into this car.
Thanks for the reply!
Dave Hall
http://www.pacifier.com/~dlhall
72 B GT
74 Midget
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From: britcars@juno.com
Sent: Monday, March 03, 1997 5:20 PM
To: dhall@hp-vcd.vcd.hp.com
Cc: boballen@sky.net; mgs@autox.team.net
Subject: Re: Vaccuume Advance
On Mon, 3 Mar 1997 10:14:16 -0800 David Hall <dhall@vcd.hp.com> writes:
>Interesting...
>I did a compression test about a year ago and got around 110-120
>per cylinder. I'll try the vaccuum guage and see what it
>says.
>
Dave....
If you had 110 to 120 lbs. per cylinder a year ago and have been using
the car, I'll wager you've got a lot less in at least one cylinder now!
Even the late B's should read 135 lbs; 110 suggests burnt valves. If you
have a burnt valve it will cause noticeable pulsations in your vacuum
readings. Sounds like time for a valve job....!
Lawrie
British Sportscar Center
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