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Discussion Forum

Farmal C Compression

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Kent VanTimmeren

05-08-2001 07:59:48

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What is the acceptable range of psi per piston?

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Bama Binder

05-08-2001 13:26:36

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 Re: Farmal C Compression in reply to Kent VanTimmeren, 05-08-2001 07:59:48  
Each cylinder should be within 10% of eachother. So if you have readings between say 90 and 100, you are OK. If I remember correctly, the C should have a 6:1 ratio, so 110-120 would be right. The repair manual will give you the factory specs.

While making a determinaation as to the health of an engine based on compression is not an absolute, the actual test and the correct factory specs ARE absolute.

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05-09-2001 05:35:55

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 Re: Re: Farmal C Compression in reply to Bama Binder, 05-08-2001 13:26:36  
Bama: Average person doing a non-leakdown compression test is far from an absolute. Its a quick easy cheap general test with "approx" numbers. ralph

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Denny Frisk

05-09-2001 10:46:56

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 Re: Re: Re: Farmal C Compression in reply to Ralph, 05-09-2001 05:35:55  
I always read where your supposed to loosen the plugs 2-3 turns, replace the plug wires and restart the engine and run for a couple minutes to blow any carbon particles out of the combustion chamber that may cause the exh. valve to leak a little. Then pull ALL the plugs, and test each cyl. preferrably with a screw-in gauge for 5-6 revolutions of the engine with the throttle wide open. Any low cylinders give them a squirt of engine oil and retest to see if they come up to pressure. If they do it's probably rings leaking. If it doesn't, it's valves. This gives a repeatable test while the engine is still warm.

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05-08-2001 10:49:30

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 Re: Farmal C Compression in reply to Kent VanTimmeren, 05-08-2001 07:59:48  
all cyls about the same is better than having one or two quite different. Compression test is general test rather than an absolute

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05-08-2001 09:14:43

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 Re: Farmal C Compression in reply to Kent VanTimmeren, 05-08-2001 07:59:48  
Standard rule for gas engines is 80 to 120 lbs.

That's 5.4 to 1 on the low end and about 8 to 1 on the high end. Tractor engines are generally low compression engines but lower than 5 to 1 is going to be difficult to start.

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