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Tractor Talk Discussion Forum

compression farmal cub

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nhboyd

10-08-2003 18:17:14




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I have a cub I haven't been able to get to run. I took a compression test two cylinders is 90 the others are 80 and 60. Anyone know what a good cub engine would read. Thank you




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Bigdog

10-08-2003 19:05:46




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 Re: compression farmal cub in reply to nhboyd, 10-08-2003 18:17:14  
Should be at least 100, but what's more important is the large variation among the readings. Squirt some oil in each cylinder and re-read the compression. If the readings improve, you likely need rings. If they remain nearly the same, it's the valves.



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Rob

10-08-2003 18:48:44




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 Re: compression farmal cub in reply to nhboyd, 10-08-2003 18:17:14  
Most gas engines have similar compression 150- 175 psig. - it's the nature of the beast. Your numbers are low. Did you have the throttle wide open and all the plugs removed to increase cranking speed? If so, you can do a leak down test to find out where it's losing compression. HTH.



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