stunthanger.com
Engine basics => Engine set up tips => Topic started by: steven yampolsky on July 02, 2007, 07:22:47 AM
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I have a couple of dumb Q's:
1) How much fuel should I put through a brand new PA61 on the test stand before it's ready to go into a model? 1/2 gal, 1 gal?
2) How much fuel does a typical does a PA51/61/65 use for a pattern?
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Hi, Steve,
On my PA engines, I try to run them 1.5-2 hours on the bench, short runs, varying speeds. Both seemed to become "friendlier" at about the 1 hour mark. Outstanding engines! The PA 61 side exhaust is using about 6 ounces for a pattern, with comfortable time after. Noel's PA 65 side exhaust, as I recall, is using a little more...maybe 6.5 ounces or so. With Randy's guidance, we are running these a little below the "pipe style" run, with very good success! Great 4/2/4, super power. Using the newer Pro Zinger 13/4 and 13/5 props is working well.
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Bill,
Could you please tell me what kind of tank you are using and what is the tank shim height?
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Hi, Brad,
I'm using either Brodak or GRW 6 oz uniflow/all tubes forward, no muffler pressure. Tank shim is about 1/8" off mounts, same as the engine pads. Might go another 1/32" if I get motivated...
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I usually run about a gallon on the bench. 4 to 8 oz at a time. Yeah it is excessive but you have to go through it. Then it will take about another 20-30 flights to "cycle" in and it should really start to smooth out and get very easy to needle and run on a day to day basis.
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Steve,
You got good solid answers.
My only quibble is your thread title: The ONLY dumb Q's are the ones you SHOULD have asked, but didn't... ;)