Alpha One Gen II RPM Limit
11-07-2005, 07:17 PM
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Alpha One Gen II RPM Limit
I am considering running a supercharged marinized Mazda rotary engine (240 hp) into a new alpha gen II drive. This engine is rated for 6500 rpm continuous-duty. Certainly the Alpha will handle the 240 hp with no problem. These engines are also not very torquey, again not a problem.
However, will the drive live at 6500 rpms sustained? Certainly there is a design rpm limit to these drives, for example, 10,000 rpms would destroy the drive I would be very certain. I cannot get information on the drive rpm limit from Mercruiser. I can speculate, though. My guess is that the drive will be ok, but I would like some hard facts or experience before pursueing this project.
However, will the drive live at 6500 rpms sustained? Certainly there is a design rpm limit to these drives, for example, 10,000 rpms would destroy the drive I would be very certain. I cannot get information on the drive rpm limit from Mercruiser. I can speculate, though. My guess is that the drive will be ok, but I would like some hard facts or experience before pursueing this project.
11-07-2005, 08:23 PM
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Re: Alpha One Gen II RPM Limit
I bought a 242 formula that has the old 454 and alpha in it. The former owner turned up the hp to 400 and ran the eng at 5200. This alpa is still alive and he didn't run a shower on it. I'm going to get rid of it for a bravo if I keep this boat.
For more rpm a shower might help cool it down so the gears don't cook. i really don't know. Just passing on what I found with my alpha.
For more rpm a shower might help cool it down so the gears don't cook. i really don't know. Just passing on what I found with my alpha.
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