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  #1  
Old 05-08-2023, 11:23 AM
R Bedell R Bedell is offline
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Default KT Compression
I am working on a KT-17 II and doing a Compression Check. The Service Manual states a minimum of 90 PSIG.

I was wonder what is considered "normal or typical".

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Old 05-08-2023, 07:16 PM
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ol'George ol'George is offline
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Originally Posted by R Bedell View Post
I am working on a KT-17 II and doing a Compression Check. The Service Manual states a minimum of 90 PSIG.

I was wonder what is considered "normal or typical".

Normal and typical, I've not seen much more than that unless freshly bored/rings and broke in.
They have a low compression ratio, so low pressures are expected.
Also gauges vary. Can't say I've seen much over #95
FWIW:
John Deere specks different cyl. heads with a larger volume in the heads.
so a little less compression ratio but not much.
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Old 05-09-2023, 08:22 AM
R Bedell R Bedell is offline
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The reason I asked, I thought I read somewhere, that 110-115 area was the norm. But that is what I recall. And these days, I just don't know for sure.
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Old 05-09-2023, 09:48 PM
yettrbomb yettrbomb is offline
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I’ve always been taught that at least 100 psi is needed. 95 seems low, but if that’s what the manual says??
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Old 05-10-2023, 07:32 AM
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1711Cub 1711Cub is offline
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Per Kohler, minimum of 90psig, and no more than 15% variation between cylinders.
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Old 05-10-2023, 07:41 AM
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I’ve always been taught that at least 100 psi is needed. 95 seems low, but if that’s what the manual says??
One has to remember the compression ratio is 6 to 1
About the same as the old ford flathead engines of 75 years ago.

A lot of todays Gasoline engines are about 9 to 1
and diesel compression ratios are about 22 to 1.
So that accounts for the lower pressures in the KT series.
They can run low octane fuel and not overheat and not suffer "spark knock"
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