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Dieseling 440

B

bushwood

Contributing Member
Back from vacation and both my 440s (with Carter AFBs) ran great. At 1860 RPM consistently (8.5 kts) I averaged 6.7 gal/hr total. My question is, after a day's run coming into a harbor, my stbd engine would begin stumbling as if wanting to die. If I gave it a little higher throttle to keep it from dieing, I could still feel the stumbling/dieseling. RPMs would jump 620-680. If I left it at the same RPM as the opposing engine (530), it would surely have died and made the Admiral quite upset as well as me.

I should add; at cruising RPM, my rpm's would not fluctuate as they do when idling.

Carb cleaning?

Thanks
 
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Or adjustment. You would have gotten better fuel mileage at a lower speed, or on plane. THe speed you ran--going uphill all the time--is the worse!

Jeff
 
Thanks for the info Jeff! I was actually happy with my mileage, considering it's a 21000lb boat ('73 36' Uniflite) and if my math is 'kind of' close, I'm at hull speed, give or take a 1/2 knot. I will follow up on the carb issue!

We went out today and preparing myself for making adjustments on the throttle when docking, the engine was fine. Must be in the carb?
 
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