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05-30-2011 01:36 PM  9 years ago
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dannyh5

rrApprentice

England

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OS 91 SZ-H help
Can anyone tell me what there needle settings are at.

I have 3/4 mid and 1&1/4 main. still seems under powered.

engine temps on landing are 23^c backplate 50^c on casing below head and 53^c on head, very very cool. Yes the backplate was below my own body temp and outside temp was 15^c.

Engine also has a healthy exhaust smoke trail. I'm just very worried about over leaning the engine.

The engine was a SZ-H PS. I have changed the back plate and fuel inlet to convert it to a SZ-H, I also changed all bearings as I bought it second hand with a trex 700 but didn't want to run a pumd reg system. Seemed over complicated.

Please post your settings and engine type

Thanks for your help
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05-30-2011 04:35 PM  9 years ago
MartyH

rrProfessor

USA

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If the backplate is that cool to the touch, lean the high speed needle. Use the mid needle just to take out any rich burble as you come off idle and are spooling up. The high speed needle (the one at the fuel nipple controls total fuel flow. Forget shooting specific temps at specific areas on the engine. Your thumb on the backplate is all you need. I'm running two of these engines. They ar easy to tune, make good power and gobble fuel like you'd expect a 90 would.

Marty
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05-30-2011 08:34 PM  9 years ago
dannyh5

rrApprentice

England

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Thanks for the reply Marty

The only reason I'm shooting temps is because the needle setting are already so low. I've been back out again with the mid at 1/2 and high at 1 1/4. Still loads of smoke and rich at high end. The head speed decays during climb outs and tic tocs. I will just keep leaning the top end. I'm thinking about putting the reg and pump back on but don't want to give up just yet.
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