We were able to idle the carb p-port RX8 engine down to
   1200 RPM unlike the p-port 13B at 2000 to 2500 RPM.

   The noise with the header and the straight
   through muffler was very tolerable. My guess not more
   that 110 db standing right next to it. I have an 8 meg video
   I'll upload to the web site.

   The EGT's were in the 1500 to 1600 degree F range
   as opposed to the 13B p-port in the 1600 to 1800 degree F range.
   --
   Paul Lamar ...No rotor no motor.



I got a sound level meter at Radio Shack for less than $10 on sale. I
doubt it is super accurate, but IMHO, much better than trying to
estimate sound level by ear.

Mark Supinski's engine read 104 dB at the wing tip.

Doc Custer
Retired software engineer and sometime Audiologist


I forgot to bring my sound level meter but it was in a steel
building standing right next to the exhaust.