Hey im back lol. I got tons of work to do before im back to testing. I cant wait to get started again. on my way back I stopped in goodland and had a great visit with Flathead. Thanks for lunch by the way. I learned a bunch looking at his engines and talking to him about all this. He brought it to my attention that I really do need to call frank bowman and talk to him bout rings. I think there are some things to experiment with there.

Dieco thats some pretty interesting results. it looks like increasing the flow helps but it also looks like there is a point that no matter how much bigger you make the outlet it wont flow anymore and will hit a top end. I am wondering is this is due to the volume of this engine just wont flow anymore and hence at a certian point a larger exshaust outlet wont help. I do remeber when I was playing with motorcycles in colorado and i had built my own exsaust pipe for an old 73 suzuki that i could not find an exhaust pipe for anywhere. It would run like crap till i started welding washers over the outlet reducing the size and it ran better with each reduction in size till i reached a point where the reduction was detrimental. just a little larger than this point is where i stopped at and the thing ran great. I think what was happening was the reduced size gave it just enough backpressure so the fuel air charge would be somewhat held in the cylinder and not follow the exhaust out the port. Objects in motion stay in motion principal. this dosent seem to be the case with the ryobi however as you can keep opening up the exhaust and it dosent seem to increase power. except when you open up a stock muffler as they sound pretty restrictive. once the point is found where increasing the exshaust opening has no affect reducing it has a detrimental affect so i dont think the principal i found on the motorcycle applies.