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Old September 26th 2006, 17:53
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Moog Moog is offline
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Location: Brighton, UK.
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I would say those readings are OK as far as making sure the pistons are not going to tap the heads while revving, BUT...

Variation from piston 1 to 2 is quite a bit - why is this? Is it piston variation, or are the cylinders sitting at different heights. Both cylinders on each side must be perfectly matched in order that the head sits square - if not then it sits askew and you blow out of one side of each chamber - as at least one of the heads seems to be blowing on one side of each cylinder only, maybe this is part of the problem?

With these deck height readings what does the compression ratio work out at - have you cc'd the combustion chambers to work it out?

Of course, there is still the possible issue of coil bind, and at least one valve tapping a piston - put some thin layer of plasticene / blu-tack on each piston crown, do a dry build, turn the engine over by hand, then take it apart to see the marks the valves leave in it - slice it carefully and you can measure how close the valve is getting to the piston crown.

Hope this helps...

Moog
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