I checked my port timing on my 535 10mil motor. Looks like I got 198 degrees of exhust port open time and 127 degrees of transfer port open time. Anyone get similar results? I is a stock, unported cyl.
Thanks!

no one has done port timing on a cheetah cyl

that sounds like as cast( they are usually a bit higher on transfer numbers but trinity sets the cheetahs) i would raise the transfers to 128-130 and get some better torque. if the exhaust is higher in time area in the blowdown phase the engine will be peaky and a raise in the transfer TA will balance it out and broaden the curve

Thanks Tim, you have a PM

There are guys out there who make a living porting. Your best results are gonna be paying for a port job and copying it if you can. As a guy who makes a living doing it its not easy nor would I be excited about telling someone else how to do it..... Properly... IMO Pay rdz or someone to do it and then degree it if you want numbers.. Like everyone else had to do

talk to as many professionals as you can. read as many books as you can. do alittle r&d of your own. its best to have knowledge from all angles and not just one source

I agree,

some things you wont be able to copy and the timings are just one part of the layout, and In the post he didnt mention the turbo, that changes everything.

Alls I know is that all the best of the best at porting have made a stack of junk cylinders in the back of the shop before hittin the nail on the head. Porting is an art... You can either feel what your trying to do or not.

the old timers most likely learned by hands on. the new up and comers are probly relying heavily on computers to figure most of the calculations, which is fine and dandy but computers are only as good as the programmer and his information sources. i doubt theres a 2stroke program in the world that doesnt have flaws in it somewhere. without atleast some hands on knowledge its going to diffucult to identify computer miscalculations