500 Engine Compression Test
500 Engine Compression Test
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Discussion

KevtheRev

Original Poster:

125 posts

98 months

Monday 8th April 2019
quotequote all
I carried out a compression test on My Griffith 500 engine today in a continuing investigation into increased oil consumption.
Engine is on 104k miles, original short engine, full top end rebuild 7k miles ago.
How do these results compare to other people's results for our engines? Any comments from people more experienced that me would be appreciated smile

Kev

Cyl psi
1 180
2 165 (Wet - 169)
3 180
4 183
5 176
6 183
7 180
8 183








Edited by KevtheRev on Monday 8th April 15:46

neutral 3

7,838 posts

191 months

Wednesday 10th April 2019
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My 98 boiled over a few times several years back and it's been using water, plus I noticed that the power was well down. We did a comp test and the two middle pots are Well down, but I wrote the numbers down in the copy of the Bible that Steve gave me with the car back in May 10, but I've lost the ruddy book!
From memory the two lowest ones were on circa 115 and the highest on circa 195, but my car just uses water, not oil ( it just leaks it ) I would say that your engine is getting tired, rings, pistons, rebore etc.