Spring Pylon Race at CCRC 06-13-09
06-17-2009, 07:23 PM
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RE: Spring Pylon Race at CCRC 06-13-09
ORIGINAL: BobHH: I did find out that removing the exhaust baffle drops the RPM about 300 to 600. So I make sure the baffle is in. Bob Harris
06-17-2009, 07:45 PM
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RE: Spring Pylon Race at CCRC 06-13-09
GSJames,
That 19,000 + number was a little inside joke. At the race this past
weekend, the best I saw on my engine was 16,280. And that was on kill.
I was leaving about 400 less than that. We used 15% Omega fuel, and
it was a typ. day in the South with a high of about 90 and about 10,000%
humidity.Believe me, it was hot and sticky. Just what 2 strk. engines hate.
Hope that helps, and good luck this weekend..................
John G.
That 19,000 + number was a little inside joke. At the race this past
weekend, the best I saw on my engine was 16,280. And that was on kill.
I was leaving about 400 less than that. We used 15% Omega fuel, and
it was a typ. day in the South with a high of about 90 and about 10,000%
humidity.Believe me, it was hot and sticky. Just what 2 strk. engines hate.
Hope that helps, and good luck this weekend..................
John G.
06-17-2009, 08:59 PM
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RE: Spring Pylon Race at CCRC 06-13-09
Thanks John, I knew the 19,000+ rpm was a joke (unless they were using a Cox 6-3 prop...) but I didn't know what other guys are actually getting and whether or not Iwas "in the ballpark". Now that I spent some time adjusting head clearances, plugs, fuel, etc. and have a reliable 16,800 on a MAS8-6 S1, I'll probably be alright this Sunday. Thanks.
06-18-2009, 04:52 AM
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RE: Spring Pylon Race at CCRC 06-13-09
Vic, he's talking about full throttle not idle!
I've seen the tach on your little .25 FX. You need to add about 3000 to that reading!!!!
GSjames, I too thought about the baffle removal before I did some testing. Seems these mufflers are also tuned pipes. Look at the exit hole of a Nelson or Jett. They look smaller than the OS hole!!
Bob Harris
06-18-2009, 06:37 AM
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RE: Spring Pylon Race at CCRC 06-13-09
10 years ago we raced Q25 up here and I remember low to mid 16's with 8x6 MAS props also. The prized ones were the older style that had a little wider blade, definately faster. I think I still have some 
Thats the class that hooked me good.
Thats the class that hooked me good.
