richard.goode(at)russiana
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 Posted: Sun Oct 10, 2010 1:43 am Post subject: AK-14P Carburetor |
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I'm certainly not an expert on these carburetors,but would say that:
They are very complex,and sophisticated,but logical to understand.
There are 5 jets in it,3 of which can be changed for different sizes.
This is apart from other adjustments for fuel pressure;idle needle;metering needle;altitude control etc.!!
The compensating jet [which the Russians call the "suction jet"]affects ALL power settings above low speed running.
The hesitation that can occur on opening the throttle is caused by the acceleration jet being wrong-in my experience as often because it dumps in TOO MUCH fuel [causing a rich cut] rather than too little.
Correctly set,there will be no hesitation.
The M14P is designed to run VERY rich at all working power settings,simply to keep it cool.We fitted a test engine with a lamda sensor in the exhaust to get accurate figures for mixture,and it was way outside the automotive range-ie too rich even to measure with the instrument!
Very few engines that we see are running as well as they should,which means no excessive black smoke;no hesitation;very smooth low speed idle;no hesitation on pick up;running cool at high power settings.
No problem to operate in the yellow sector-the designers were very conservative and allow 220 degrees continuous,but I would try to keep under 205/210 for continuous.
Finally,the CHT gauges can be very inacurate-have you checked yours to see how accurate it actually is???
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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