dahboat
New Member
Can anyone tell me the speed at which my 86 340 Sedan Bridge will plane? Also, at what RPM does the carb secondaries start to kick in on the Merc 454s? Thanks
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rondds said:hi alex
i find that i stay out of the secondaries at or below 3250 rpm. that keeps my speed at a hair under 19mph (17+ with a stiff headwind) and gph at around 26 total. i think the specs on our boats are different. i am 12.5' wide and 16500lbs dry.
i believe that prop pockets AID in planing. that is the advantage they have - they tend to keep the shaft angle lower so thrust is directed more outward than downward. this gets you up on plan faster and decreases your running angle.
when i first got this boat, i think i recall being able to hold plane at about 13 mph. boat was dragging a LOT but the wake was flattened out.