2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Compression Question

Old Dec 4, 2006 | 09:35 PM
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Compression Question

Today I had a buddy of mine come over with a compression tester. I removed the egi fuse to keep the engine from firing then remove the top spark plug and put the gauge on it. It registered 100psi on both of the top ports. Then it registered 85psi on both the bottom ports. I'm not sure if I tested the compression right but i think that was how I was supposed to do it. Does this sound normal or are the low ports too low? Sorry for all the questions guys but there is no-one around here who knows **** about rotaries. So this is my only real source of knowledge. thanks again.
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Old Dec 4, 2006 | 11:05 PM
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not quite sure what you mean top and bottom port, unless the n/a test procedure is totally different from T2.
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Old Dec 4, 2006 | 11:25 PM
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I think he means the top and bottom spark plug holes.
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Old Dec 4, 2006 | 11:26 PM
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Arent you just supposed to use the top plug holes?
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Old Dec 4, 2006 | 11:32 PM
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Well, I have always done it with trailings (top) but the writeup on rotary ressurection says to use the bottom ones.
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Old Dec 4, 2006 | 11:34 PM
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hmmm. i dont see where it would matter too much. I used the tops cause thats what I read everywhere
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Old Dec 5, 2006 | 12:33 AM
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Ya I meant the spark plug holes when I mentioned ports. So if I was just going by the top half it's hitting at 100psi everytime and would be much better than taking the bottom readings of 85. Oh well i'm pretty sure it's the turbo after having everything torn down. That's my next move then after the dust settles I expect it to be up and running.
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