Cyinder pressure???

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Cyinder pressure???

Post  1951 ford on August 14th 2013, 8:26 pm

Hey guys just did a compression test on my build . Dont think i even have an hour of run time on the engine and i'm seeing about 165 psi and all cylinders. Is this good and will it increase once engine is broken in ?
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Re: Cyinder pressure???

Post  kim on August 14th 2013, 9:16 pm

Good or bad depends on cam, ring gap, and most importantly, was it warm and sealing or cold? Was the throttle held wide open? Lots of variables affect that reading, the most important thing is that all cylinders seemed equal.

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Re: Cyinder pressure???

Post  Dave C. on August 14th 2013, 9:29 pm

Yep

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Re: Cyinder pressure???

Post  1951 ford on August 14th 2013, 11:31 pm

engine was cold throttle wasn't open .new to this whole thing . cam is an comp cams XE274h
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Re: Cyinder pressure???

Post  69F100 on August 14th 2013, 11:43 pm

1951 ford wrote:engine was cold throttle wasn't open .new to this whole thing . cam is an comp cams XE274h

When I had the same cam in my 460 with the stock dish pistons and dove heads it had around 170psi
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Re: Cyinder pressure???

Post  dfree383 on August 15th 2013, 12:51 am

Whats the Mechanical compression?
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Re: Cyinder pressure???

Post  1951 ford on August 15th 2013, 9:08 am

flat tops with dove-c's so 10.5:1 ish i think
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Re: Cyinder pressure???

Post  IDT-572 on August 15th 2013, 9:59 am

Warm it up and open the carb and it will be a good bit higher.
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Re: Cyinder pressure???

Post  LivermoreDave on August 16th 2013, 9:56 am

Just curious, what initiated a cranking compression test?

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Re: Cyinder pressure???

Post  rmcomprandy on August 16th 2013, 10:36 am

If you advance the camshaft you will get more cranking compression however, that certainly doesn't mean it will make more power; maybe even less.

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