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Old 12-19-2011, 01:26 PM   #31
chasbmw
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Peak torque on many airhead engines is at around 3-4K rpm......I somehow don't think that an airhead engines flows less air at 3500 rpm than at 6000rpm

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Old 12-19-2011, 01:32 PM   #32
chasbmw
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To go back to the original query, when Jim Cray did the first tuning work on my 82 euro RT engine, he fitted low compression pistons, then machined the cylinders to produce a proper squish band at around 9.5 CR. it was a very good engine and was perhaps part of the most cost efficient tuning package.

He also drilled 4 X 1.5inch holes in the top of the square air box and reduced the length of the intake snorkels by 50%. The K&N air filter dealt with the rainwater issue.

Charles
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Old 12-19-2011, 02:47 PM   #33
Rob Farmer OP
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This is an old thread.

I went with the early 80's euro pistons and heads with a moorespeed rework of the heads with oversized valves. Very pleased with the setup which has a lot more umph than my standard pd
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