As previously noted in this thread.....how fast an 18x6 will spin is pretty meaningless for pattern applications....not enough pitch to be useful. Static RPM of 9300 is also pretty meaningless for pattern since the noise is going to be pretty loud - certainly over 96 db (AMA) or 94 db (FAI).
And as most people learned who ran piped 2C setups in pattern, comparing ground RPM is of little use. Far more important is how well the engine "behaves" - how it transitions on/off the pipe, and how much power it makes it the air when the pipe is set for smooth throttle response. Best example of this was/is the Webra 160 MC, which when setup "best" for pattern often turned fewer RPM on the ground than a Webra 145.
Matt and Ed both have plenty of experience with piped 2Cs....so I am sure the setups they settle on will be flyable for pattern, and not just static numbers.
Regards,
Dave
ORIGINAL: PlaneKrazee
ORIGINAL: rcpattern
On post 37 here, the Syssa is turning an 18X6 Vess at 9300, which to me would indicate the Syssa is stronger. I can't believe a pipe would make a 1200 RPM difference.
Arch
rcpattern,
Ya, and I can't believe it's not butter
Depending on the porting and the length of the tuned system, even greater rpm gains could be achieved. Some engines respond dramatically to a pipe and some don't do to the porting.
I am posting the finding of engine owners, not speculating.
In Todd's engine manual with the engine running without exhaust restrictors the max rpm is rated @ 8750 rpm with the Vess 18X6. No one running the Syssa has acheived that rpm with the stock exhaust, yet.