compression ratio on 95 7.3??? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 06-13-2010, 09:14 PM Thread Starter
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compression ratio on 95 7.3???

i heard it was over 400 but i saw a engine today with a consistant 350 on all 8 cylinders and it was a new(rebuilt) moter,whats the consensus? i do say ol'chap will you be haveing a totty with me tonight??? i guess ill go back to my roots and post like a freakin scholar since people cant read anything without correct punctuation and grammer...freaks
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post #2 of 13 Old 06-14-2010, 02:38 PM
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IIRC 400-425 is Ford's spec. 350 is a bit low but if the rings haven't yet seated (you said it was recently rebuilt) that would be expected. It takes a little while too. That being the case the uniformity is the big thing and the pressure will come up when the rings get seated. The compression ratio is 17.5:1.

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post #3 of 13 Old 06-14-2010, 03:36 PM Thread Starter
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kay,thanx dude.i meant to update this today,we did a compression test on one that has 305,000 miles today and all 8 cylinders were consistant and in the area of 350,
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post #4 of 13 Old 06-15-2010, 09:49 AM
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Originally Posted by harley1rocker View Post
kay,thanx dude.i meant to update this today,we did a compression test on one that has 305,000 miles today and all 8 cylinders were consistant and in the area of 350,
I guess if it starts easily and runs good, then "let her go"! The consistency is the important thing.

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post #5 of 13 Old 06-16-2010, 11:34 AM
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I was told at one time and can't remember where that the compression was 30 to 1 on these trucks.

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post #6 of 13 Old 06-16-2010, 12:34 PM
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Originally Posted by bucwheat View Post
I was told at one time and can't remember where that the compression was 30 to 1 on these trucks.
Just a little more than half of that. Check out this article: Ford's Power Stroke Diesel History - Diesel Tech - Diesel Power Magazine

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post #7 of 13 Old 06-16-2010, 01:11 PM
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the 6.5's run soemthing like 22.5:1 or there abouts. a popular rebuild mod is 18:1. i would imagine the 22:1 certainly helps cold starts though!

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post #8 of 13 Old 06-16-2010, 04:54 PM
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yea my buddys got an old 6.5 and a 6.2 and hell fry the head gaskets if his boost gets to high


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post #9 of 13 Old 06-17-2010, 06:07 AM
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Originally Posted by ryandamo View Post
yea my buddys got an old 6.5 and a 6.2 and hell fry the head gaskets if his boost gets to high
yeah stock is about 7 psi max borderline mod is about 12. the guys who put in 18:1's generally run up to 18.

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post #10 of 13 Old 06-17-2010, 06:30 AM
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wow those good old useless GM motors

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