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Old Aug 27, 2012, 08:43 PM
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Joined Jul 2012
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Results from larger pulse fittings

I installed the 8/32 threaded fittings to the back plate and pump on my engine, following earlwb's suggestion. Before, the engine would sag if the throttle was opened more than about 80 percent.

With the new fittings and a short 1/8 inch id pulse line, the engine now runs fine wide open. I attached a long line to the fuel tank and found that when I moved the tank down so that the fuel level was 32 inches below the needle or if I raised it 32 inches above it made no difference. I imagin I could have lowered the tank even more, but was limited by my test stand and the tube I had handy.

In addition, the idle was better. I could get it down to 2.2k rpm without surging with a 12x4 APC prop.

Excellent work!
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