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Originally Posted by BUP
(Post 4735563)
Your Alpha gear ratio is set up for a V6 190 hp stock mercruiser engine.
Gear ratio also effects where peak torque will land for rpms. Most marine engines peak torque lands around 70 - 75 percent of max load. |
Originally Posted by Team gone again
(Post 4735561)
hi I have a 24ft crestliner nortic, when fully loaded we are about 6,300lbs just shaped engine to a 383, with 425ftlbs from 2k and on rpms and 398hp at 5500rpm. We have an alpha one with 1.84 gears and a 14 5/8"x 23p 3 blade prop and get to 42 @ wot 5500 but have lots of throttle left? Any ideas on what prop I should get. Thanks
1" pitch is approx. 200 rpms....In your case going from a 23P to a 25P will drop 400 RPM, a 27P prop will drop 800 Rpm |
Originally Posted by speicher lane
(Post 4735567)
How can you be at WOT and have throttle left? Or, are you stating the engine is maxed out in "safe operating" RPMs well before Full throttle?
1" pitch is approx. 200 rpms....In your case going from a 23P to a 25P will drop 400 RPM, a 27P prop will drop 800 Rpm |
I would test a known stock Mercury 25 Mirage Plus and learn from that.
Brett |
Wrong gear ratio for the app. Like I said for an alpha outdrive Standard gear ratio for a V 6 190 hp is 1.84.
also the alpha gen 2 is rated for 300 hp only. The 6.2 L - 377 cid at 320 hp will not ever come with alpha outdrive. All the OEM Merc 6.2 s comes with Bravo s that are sterndrive apps. |
Well I just purchased the 1.5 upper with HD gears ill get back with some more info.
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Well did a test run with the new upper! With a 23p 3 blade we got to 43mph @ wot 4500rpm. With the 19p got to 38mph @5000rpm with throttle left. Both have about 35% slip any ideas on how to get slip lower. Gonna try a 21p this week to see what happens.
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You are more than welcome to call us and we can start from the beginning and give you our advice as to the best next move considering your performance goals.
Sometimes, forum discussions can't get to the point or the ending. There are always many variable involved. Brett |
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