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Help building,tuning a Strato, Husqvarna 445
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<blockquote data-quote="drkptt" data-source="post: 3068410" data-attributes="member: 21543"><p>I've got a steady-state dyno running under speed control, a precision fuel-flow meter, and a 5-gas exhaust analyzer that resolves AFR (both overall and trapped for stratified-charge engines). I can't confidently make observations about carb tuning until I plot the data and study it. It seems to me that it would be extremely difficult to evaluate mixture at peak power and torque without those tools. </p><p></p><p>Typically I'd set the desired mixture at peak power and sweep through other speeds looking for little change in AFR. A flat response or enriching at lower speeds is desirable--when you dog a saw and slow it down you would not want it going lean. Playing with the size of the airbox inlet holes is the best bang-for-the buck to flatten the AFR/speed response.</p></blockquote><p></p>
[QUOTE="drkptt, post: 3068410, member: 21543"] I've got a steady-state dyno running under speed control, a precision fuel-flow meter, and a 5-gas exhaust analyzer that resolves AFR (both overall and trapped for stratified-charge engines). I can't confidently make observations about carb tuning until I plot the data and study it. It seems to me that it would be extremely difficult to evaluate mixture at peak power and torque without those tools. Typically I'd set the desired mixture at peak power and sweep through other speeds looking for little change in AFR. A flat response or enriching at lower speeds is desirable--when you dog a saw and slow it down you would not want it going lean. Playing with the size of the airbox inlet holes is the best bang-for-the buck to flatten the AFR/speed response. [/QUOTE]
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