Just my 2 cents but we are talking about lawn mower engines. I would think they only way to accurately measure this would be on a dyno with egts, O2 sensors etc. Then when all is said and done then what?
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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