Originally posted by ChuckAuger
I tried to use a Macs 7.5cc pipe on a 46 VRDF and it ran terrible. I was not just blowing plugs, I was losing elements. I switched to a Nelson pipe per suggestion of Dave Shadel, he said he felt the Macs pipe didn't have enough volume to run at these RPM's. Then it ran, great, just perfect. I was turning 22K with a APC 7.4 X 8.25 CF prop. Not sure if you will get these R's with a 9X8, although the VX DF is stronger.
At 22K I ran no header..maybe 1/2" stub of header, the pipe hooked directly to the read of the engine.
Thanks Chuck
Just the type of info I needed.
It seems this engine comes with a bolt-on exhaust adapter. From the attached picture I see the adapter has a rubber O-ring. Did the Nelson pipe simply slide over this O-Ring?
Was this a perfect fit?
Thanks for your help.
