On Thursday, January 6, 2005, at 01:28 PM, Russell Duffy wrote:

My p ports open at 78º BTDC and close at 75º ABDC. This drawing shows how much later the ports open in comparison with the Leman P Port and how they close at nearly the same time. According to calculations made by Rolf Peiffer who helped me a lot, my little port has sufficient capacity up to 8000 rpm. After that you would want to go bigger. The exhaust port was left stock with the splitters in. . Jerry 
 
Thanks for the info, and pic Jerry.  Do you have an estimate of how much HP you expect to make at 7500 rpm?  And can you get that thing running in the next month, so it will be easier for me to decide what to do :-)
 
Cheers,
Rusty

Rusty, The hp question???? A worse case scenario I feel would be 230 hp at 7500. I think around 250 hp is realistic if we can get it up to its potential. It depends on so many factors that will have to be ironed out on the dyno. I have a 2:17 drive and a 800 lb airplane so if I equal PowerSport's performance of 215 at 6000 that would be sufficient to get the heart pumping on climb out. That said, I think PowerSport's intake is too long and also they could benefit from ram air. So maybe I will do a little better then they have. My exhaust is a free flowing, zero back pressure design and I am hoping it will help too. Best thing for you to do is to haul that engine to Lynn"s and knock out a p port in a couple of days. Jerry