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....And he said low compression???

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08-09-2004 08:18:00

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I was told that the motor in my H was built for low or lower compression...but it kicks out 250psi at cranking speed cold. Anyone have any idea what the compression ratio would be? 11 to 1?..... thanks, AC

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ChadS

08-11-2004 08:01:19

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Re: ....And he said low compression??? in reply to AC, 08-09-2004 08:18:00

Sounds like,, it is not broke in all the way just yet,, could be the reason for uneven cyl pressures,,,, LOW compression my tail feathers,,,, LOL!! U coming to Westville? Chad

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BushogPapa

08-11-2004 06:37:46

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Re: ....And he said low compression??? in reply to AC, 08-09-2004 08:18:00

With those pressures, you gotta tune it very carefully, and listen for any "pinging" or detonation...!! Don't let it ping, or you will be building a new engine..!! Ron.

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buickanddeere...cylinder

08-09-2004 11:01:41

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Re: ....And he said low compression??? in reply to AC, 08-09-2004 08:18:00

Cylinder pressure would be a better measurement than mechanical compresison ratio. You can take a modest 7 to 1 engine with a very short cam, have lots of low end torque, very little high rpm HP and require premium fuel. A 9 to 1 ratio with a long wild cam may have lower cylinder pressure, not require premium fuel and make decent high rpm HP.

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08-09-2004 10:26:45

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Re: ....And he said low compression??? in reply to AC, 08-09-2004 08:18:00

Also, I worked with the valves today during my lunch break, and 3 cylinders are between 245 and 250. One is 275....They all are set properly...what gives?

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G-MAN

08-09-2004 10:51:40

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Re: ....And he said low compression??? in reply to AC, 08-09-2004 10:26:45

The higher hole has better ring sealing than the others, or the others have slightly leaking valves, etc. 10% maximum variance is usually okay, so you're pretty close. I don't think I'd lose any sleep over it anyway.

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08-10-2004 05:36:13

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Re: ....And he said low compression??? in reply to G-MAN, 08-09-2004 10:51:40

Thanks, guys.....

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