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Compression Test Numbers... #684589
04/30/10 08:41 AM
04/30/10 08:41 AM
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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OrangeProwler Offline OP
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OrangeProwler  Offline OP
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The engine is a 68 318 with supposedly around 182k miles on it? Let me know if you have any feedback. My results were as follows:

Cylinder
1= 135
2= 135
3= 145
4= 150
5= 135
6= 145
7= 140
8= 150

Thanks in advance

Re: Compression Test Numbers... [Re: OrangeProwler] #684590
04/30/10 09:37 AM
04/30/10 09:37 AM
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Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Fairly high consistent readings. You're in good shape esp w that many miles


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Re: Compression Test Numbers... [Re: RapidRobert] #684591
04/30/10 10:09 AM
04/30/10 10:09 AM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
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Dodgem  Offline
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Posts: 5,746
Ontario, Canada
Great I once put 360 heads on a well used 78 318 in my truck and it had 100 to 110 would pull my car and trailer with ease and run 15's in the quarter. LB4B intake 750 Vacuum holley headers and an erson cam.
Do the timing chain for sure.

Re: Compression Test Numbers... [Re: Dodgem] #684592
04/30/10 06:07 PM
04/30/10 06:07 PM
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Posts: 1,819
Middle of A Field
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OrangeProwler Offline OP
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OrangeProwler  Offline OP
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Thank you. I just wanted to make sure I didn't have too much variation on the two cylinders. I guess while I'm at it; what type of numbers does a freshly rebuilt engine have for compression just out of curiousity?

Re: Compression Test Numbers... [Re: OrangeProwler] #684593
04/30/10 06:15 PM
04/30/10 06:15 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
Quote:

what type of numbers does a freshly rebuilt engine have for compression just out of curiousity?


maybe ~160-200 depending on the static CR and the cam


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Re: Compression Test Numbers... [Re: OrangeProwler] #684594
04/30/10 07:11 PM
04/30/10 07:11 PM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
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Kern Dog  Offline
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
As mentioned above, the compression numbers for a fresh motor can vary. The numbers will be high with a 10 to 1 motor with a totally stock cam. Put in one designed for performance, and the overlap and long duration bleed off pressure and the compression test will show lower numbers. ALSO..... Most repair and service manuals state that anything LESS than 10% variance between the highest and lowest cylinders is acceptable for a street engine, and is a better guide to an engines condition than any specific number.







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