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I did some more static engine testing today. Mounted an electric leaf blower in front of my P-51 style scoop to force air in the radiator and oil cooler. Warmed up the engine to 125F and did the "auto tune magic". I'm not quite sure if i was doing it right, But the high-power test later gave me 5750 rpm static (2650 prop) That's 250 rpm more than last night before the tuning.
During the test I had a visitor. The guy that rebuilt my engine came buy and said that my turbo-exhaust is very restrictive and I should go in to 2 in one pipes and get rid of the heavy turbo castings. Took me to his race 12-B that's set up for 9-10,000 rpm. It is across the street in a aircraft muffler shop and showed me his race manifold.
Looks like there are couple of hundred rpm to be gained from the exhaust change?
I remembered George Graham uses straight out flexible SS tubes without a muffler and his engine does not sound bad. Also it is 8 feet behind me and points away from the cabin. this weekend may try to get it airborne again?
Buly
On Jul 13, 2006, at 9:28 PM, Bulent Aliev wrote:
Today I had a chance to test my 2 blade 68" diameter Ivo Magnum electric prop at fine pitch about 50". With 3 blades I was getting 4700 (2160 prop) rpm static (2.17 drive). Two blade gave me 5500 static. About 2500 at the prop.
For some reason today, at low rpm the engine was surging up and down, but it was getting dark and I did not do any trouble shooting.
Bulent "Buly" Aliev
FXE Ft lauderdale, FL
http://tinyurl.com/s5xw8
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