ORIGINAL: DagTheElder
Hi Matt,
Reading about the SAP 180 and digest the results, one thing comes too my mind re tuned pipe. As I understand you are now using a pipe for high revs? What comes to my mind are making a pipe that is especially tuned for low rev. so-called Enduropipe. This will have a different shape and maybe a larger diameter.
If it is possible to make such a pipe one will probably get a lot more grunt at low revs. Maybe this will solve your quest for power???????
However, do you know the timing of the exhaust port opening at dgree and the stroke? Rainy days maths maybe??????
Regards
Dag,
Exhaust duration is just about 170 degrees. It is very long duration that really takes advantage of lower loads in piped set-ups. Something like an 18x8 that is used in sport jobs extensively, will rev into 94-9500 or so on pipe. Same prop on muffler is 800 rpm less.