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Author Topic: Engine out of frame compression test  (Read 1305 times)

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Offline Burke

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Engine out of frame compression test
« on: June 01, 2009, 04:38:00 PM »
Would an engine out of a frame (no carbs or pipes) give the same compression reading that if it had everything on?

If not, how could you test it?
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Offline fmctm1sw

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Re: Engine out of frame compression test
« Reply #1 on: June 01, 2009, 05:27:37 PM »
Considering your're supposed to open the choke the whole way and have it at full throttle whe you're testing compression, I'd say having the carbs off is no problem at all.  Possibly even better?  Pipes I don't know about, but I don't imagine it would be much of a problem either.  I guess the only worry I'd have is keeping the engine still when doing it...
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Offline MCRider

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Re: Engine out of frame compression test
« Reply #2 on: June 01, 2009, 05:50:11 PM »
Quote from: Burke on June 01, 2009, 04:38:00 PM
Would an engine out of a frame (no carbs or pipes) give the same compression reading that if it had everything on?

If not, how could you test it?
Never heard of it being done. But if you absolutely feel driven, you'd need to know everything is oiled up. I mean there won't be any fresh oil going to the main bearings, can you live with that?

Oil down all cylinders thru the plug holes.  Spin it with the bolt on the end on the rotor, with a drill motor of some sorts.

There is such a thing as a leak down test, not sure of the details.
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Offline Burke

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Re: Engine out of frame compression test
« Reply #3 on: June 01, 2009, 06:00:27 PM »
I was able to rig the engine so it would not move and I had the kicker on, I hooked the compression tester, on #4 kicked it over a few times and it read nothing, 0, did not even move.
Maybe tomorrow night I will go out there and oil them up, and see if it gets a reading.
Since it read 0. no movement, I think something else must have been up.
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