I would be very interested in what your thoughts are on this. Ive got my own theorys on this, but un-shure if im on the right track.

 

Hmm........very interesting. Seems as though the guy that's about to build my engine believes in the super polished porting along with polishing out the rotors. He should be tearing down my motor before the weekend. I'll have to ask him to elaborate on his porting methods. He is running a 9 second Rx-3 with a 13B in it. So, he has tons of racing experience and has been building motors for about 12 years now. I'll let you know what he says about the porting.

 

BTW Judge Ito, my guy's name is David Biggers and he is in Orlando, FL. Have you...or anyone else here ever heard of him by chance ?

 

Not I, My thought son porting are to sand them down with some 120 grit and leave it at that.

I dont think that the runners need to be that smooth and I also think that the a/f mix gets atomized better on the rougher walls.

As long as the shape is good that is.

 

At leats that is what I did on mine.

 

I do some of the porting here at pettit racing. I know thats pretty far from you guys. But our porting is some of the nicest stuff I've seen. @ 15 psi we can achieve 500+ rwhp. And thats just a street port. One thing that is very important is surface finish. The rule that I have been taught is: Make it perfectly smooth. right up until the fuel injectors. Then the surface finish changes. I've heard ITO does very nice work. And I'm sorry to hear that someone had a bad expierence with pineapple. If you guys want a quote PM me and I'll be happy to get you one.



pettitman

 

thats like the rule of thumb with a carb setup, you want it rough where theres fuel mixed with the air.



mike

 

my guess on the roughness issue is having to do with the boundry layer of the charge? better atomization of the fuel that has dropped out of suspension?

 

Judge,yes he does have a back door number,but i forget to get it when i leave.i will try to remember on thursday.i am trying to get my first gen done by friday so i acn race it this weekend.should be an interesting ride i set the engine back 3in.into the chasis.the motor makes around 230 at the flywheel with out Nitrious(large streetport)and i have a 150 directport shot.I'll post some timeslips on sunday.

 

I can't say I have heard of him. Really rare because I try to know a little bit of every single rotary engine drag racer from east to west and north to south