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Jasonserb

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In addition
« on: September 08, 2020, 07:41:46 PM »
I'm running a 455 olds bored 30 over
10:1 compression.
I did a compression test in it. The back 2 cylinders are weak compared to The other 6. The front 6 are running between 100 & 110 psi. The back left is @ 75 psi and the back right is @ 95 psi. At an idle I have 40 lbs of oil pressure.

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76Mantra455

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Re: In addition
« Reply #1 on: September 08, 2020, 09:10:33 PM »
What issue are you having with it? How many hours are on it? Have you done a leak down test on it?
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Flusher

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Re: In addition
« Reply #2 on: September 08, 2020, 11:05:24 PM »
Also try squirting a shot of oil into the low cylinders, through the spark plug hole, and run the test again.  If it picks up, it indicates rings.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

Jasonserb

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Re: In addition
« Reply #3 on: September 09, 2020, 04:00:02 PM »
Quote from: 76Mantra455 on September 08, 2020, 09:10:33 PM
What issue are you having with it? How many hours are on it? Have you done a leak down test on it?
It has a knock to it.

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