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Carburation on overrun

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Basil

Well-Known Member
Supporting Member
Joined
Aug 19, 2017
Messages
55
Location
Countesthorpe UK
I have a Hirth F23 in my microlight. It runs well at throttle openings above about 1/4 and idles OK on the ground at about 1800 rpm. However when descending with the propeller being driven by the air stream and small throttle openings on cylinder cuts out. This is detectable from the low exhaust gas and cylinder head temps on one side.
My question is, at a throttle opening that would run satisfactorily at 1800 rpm on the ground but with the engine turning at 3200 rpm in the air, is the mixture weaker or richer due to the increased revs.
 
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