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Ford 860 ---compression diagnosis

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8N'r--WI

07-18-2007 06:24:21




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Test results dry are between 118-124. Would these results indicate a "good" used engine, or would they tell me someting else?

No smoke, sounds good, starts and runs good.

I know a bit about the N's, but never owned an 800 Series.

Thanks, Tim




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Jeff_G

07-18-2007 09:12:02




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 06:24:21  
Run the motor for at least 3 minutes to warm the motor and lube then do a compression test. Dry tests are worthless. Keep in mind most gages will vary, some quite a bit. Your 124# may be another's 150. What is more important is the difference between cylinders. No more than 15# on a warm engine.



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old

07-18-2007 07:45:29




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 06:24:21  
Dry they look to be right in the ball park maybe just a tad low but still not all that bad



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8N'r--WI

07-18-2007 07:56:09




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 Re: Ford 860 ---compression diagnosis in reply to old, 07-18-2007 07:45:29  
Thanks Old---was hoping to here that, but don't know what the new engine compression should be--Tim



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old

07-18-2007 09:30:43




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 07:56:09  
I've seen a brand new engine with numbers in that range but thats because the rings hadn't seated in yet. A real good engine will have numbers above 150 but again it depends on the engine and what may have been done to it



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RodInNS

07-18-2007 06:36:40




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 06:24:21  
Not new by any means, but those are good figures for a used engine, and the spread between them is fine. If it sounds good, go with it.

Rod



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8N'r--WI

07-18-2007 07:54:42




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 Re: Ford 860 ---compression diagnosis in reply to RodInNS, 07-18-2007 06:36:40  
Thanks---do you know what a new engine compression should read---Tim



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Fordfarmer

07-18-2007 08:02:19




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 07:54:42  
Book spec for a new engine is 205 @ 1000 rpm.



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Lumpy

07-18-2007 10:12:53




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 Re: Ford 860 ---compression diagnosis in reply to Fordfarmer, 07-18-2007 08:02:19  
I would like to know where you guys are getting your compression specs from. All the local engine builders in my area are saying 150 psi TOPS for that gas engine.



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Fordfarmer

07-19-2007 07:32:42




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 Re: Ford 860 ---compression diagnosis in reply to Lumpy, 07-18-2007 10:12:53  
That is right out of the 1955-1960 Ford service manual, page 52. I personally have never seen one make that much compression, though.



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GlenIdaho

07-19-2007 15:12:11




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 Re: Ford 860 ---compression diagnosis in reply to Fordfarmer, 07-19-2007 07:32:42  
Yep, right out of the shop manual!



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GlenIdaho

07-18-2007 08:01:43




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 Re: Ford 860 ---compression diagnosis in reply to 8N'r--WI, 07-18-2007 07:54:42  
The compression new is 205 psi at 1000 rpm.



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john_bud

07-18-2007 09:39:40




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 Re: Ford 860 ---compression diagnosis in reply to GlenIdaho, 07-18-2007 08:01:43  
Exactly. The procedure is to pull a plug and test the cylinder while the engine is running at 1000 rpm.

I wouldn't bother given it is running well now.

jb



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