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Jet Boats
General Jet Boat Discussions
Mercury 60/40 4 Stroke 4800 RPM WOT right?
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<blockquote data-quote="LarryMc" data-source="post: 425131" data-attributes="member: 13895"><p>According to Mercury, the 4 stroke dry weight is 267 lbs. The 2 stroke weighs 233 lbs. Not enough weight difference to make that much difference in the speed. The 4 stroke motor is just not strong enough to run the standard 6 7/8" impeller at 5200 rpm which is what I got with the 2 stroke. Mercury had to cut the trailing edge of the impeller back in order to get the motor to rev up to 5200 rpm. I tried running my old impeller in the 4 stroke and it would only get 4900 rpm. The hole shot was a little better, but max speed was only around 24 mph in still water.</p></blockquote><p></p>
[QUOTE="LarryMc, post: 425131, member: 13895"] According to Mercury, the 4 stroke dry weight is 267 lbs. The 2 stroke weighs 233 lbs. Not enough weight difference to make that much difference in the speed. The 4 stroke motor is just not strong enough to run the standard 6 7/8" impeller at 5200 rpm which is what I got with the 2 stroke. Mercury had to cut the trailing edge of the impeller back in order to get the motor to rev up to 5200 rpm. I tried running my old impeller in the 4 stroke and it would only get 4900 rpm. The hole shot was a little better, but max speed was only around 24 mph in still water. [/QUOTE]
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Jet Boats
General Jet Boat Discussions
Mercury 60/40 4 Stroke 4800 RPM WOT right?
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