Hello Lee, for more than 2 years I have been working on 4 cilinders to found some HP. For the moment I have 33,8 hp on the wheels and a engine with a width power band. Engine has now 15 houres , no problem at all. It’s a real pleasure driving it.
First of all ==> writing about HP is much easier than having them realy on a testbench. Believe me it’s a lot of trail and error. Bigger ports doesn’t always mean more power guys, it’s not that simple. I had more power with a smaller exhaust port than a bigger….. you don’t want to have all your fresh gases going without burning into your exhaust pipe and cool it down….
The Krauss max doesn’t have a reliable image in europe and not very popular.
The Polini kit has the same problem ( mine had 3h and boemmmmm :-(
The DD2 cilinder or supermax only has high rpm output , I was not impressed because of the lack of bottom and middle power.
What I have done :
I have the ignition you have mentionned but directly from the OEM without rev limiter.
Modified cilinder ( additional booster ports, modified A, B, C ports )
Other cil head & piston
other conrod
balanced crank
Handmade exhaust & muffler.
I will try to post some pictures to make it more visuel.
just a question : what’s the price of a Rotax max cilinder in your country ?
