Bigger is not always better.

[CastleMGBV8]

A very interesting article by Sean Brown a highly respected US cylinder head modifier on how to make a head flow efficiently.

Ok i'ts a Lotus twin cam head, but the port and seat work are relevant to almost any type of head.

Kevin.

http://www.flowspeed.com/brady-tc.htm

[sidecar]

A very interesting article by Sean Brown a highly respected US cylinder head modifier on how to make a head flow efficiently.

Ok i'ts a Lotus twin cam head, but the port and seat work are relevant to almost any type of head.

Kevin.

http://www.flowspeed.com/brady-tc.htm

Good stuff, cheers for the link!

Pete

[crayefish]

Very interesting article. Goes to show that bigger valves isnt always better... especially if you do a bodge job of instaulling them. I can believe the guy didnt even bother to match the larger carbs to the inlet manifold!

On the subject of "too much power"... A company I have worked with before made an amazing v-twin 2 stroke motorcycle engine for competitions a few years ago. However in testing the test driver wasnt getting very good lap times... until suddenly the lap times went up. It turns out one of the cylinders failed so the engine was running on only one cylinder. The rider said that once it was running on only one cylinder, the bike became much more controlable and was much easier to ride, resulting in better lap times. Before, due to the engines huge power, throttle control was very difficult which made it much more tricky in the turns