Anybody clued up on airhead pistons? - Page 3

chasbmw · 12-19-2011, 01:26 PM

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

Charles

chasbmw · 12-19-2011, 01:32 PM

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

Rob Farmer · 12-19-2011, 02:47 PM

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

12-19-2011, 01:26 PM	#31
chasbmw Beastly Adventurer Joined: Feb 2006 Location: Bath Uk Oddometer: 1,025	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 Charles __________________ Charles http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg R90s 1070 replica, R90/6 1971 Commando Fastback

12-19-2011, 01:32 PM	#32
chasbmw Beastly Adventurer Joined: Feb 2006 Location: Bath Uk Oddometer: 1,025	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 __________________ Charles http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg R90s 1070 replica, R90/6 1971 Commando Fastback

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12-19-2011, 02:47 PM	#33
Rob Farmer ^OP Beastly Adventurer Joined: Aug 2002 Location: Loughborough, Leicestershire. England Oddometer: 3,793	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