uneven compression

Jim Isler · Sep 7, 2008

I finished a ring/bearing job on my H and it runs well now, but I"ve got 80psi compression in cylinders 1 and 3 and 60psi in 2 and 4. did I mess up on valve timing?

Bob · Sep 7, 2008

Valve TIMING will affect ALL cylinders equally.

Have you run this thing long enough under load to break it in?

What is the problem that lead to the compression check?

teddy52food · Sep 8, 2008

Did you grind the valves?

james rumph · Sep 8, 2008

Hook it to a plow and use it or if you know some one with a dyno hook it up and work it .

You didn't tell us how much run time is on the rebuild so we are guessing the rings havn't seated just yet.

I had a motor in my Super M that had lower compression when cold but great #s when warm.

I had a great head on it so it wasn't it. We reringed it because the ring end gaps were rather large and out of spec.

I had bought one of those kits and not checked the ring gap, lesson learned.

When you reringed it do you run a ball hone threw the cylinders to remove the glaze or just put new rings in the old cylinders ?

Jim Isler · Sep 8, 2008

What led me to recheck the compression was the fact that it continued smoking after I'd run it for an hour pulling my spreader around. I haven't probably run it enough with a load, just about an hour. I'll try that some more. Thanks for your help.

uneven compression

Jim Isler

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Bob

Well-known Member

teddy52food

Well-known Member

james rumph

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Jim Isler

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