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How fast before blowout??

Old 07-10-2003, 04:32 AM
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Join Date: Oct 2000
Location: Norway
My Boats: Phantom 25 (1985) w/Verado 400R
Posts: 600
Default How fast before blowout??


I will try out an experiment next year - adding another Promax 300 (SVS) to my Phantom 25. We have measured and I have spoken to the builder, and it should be fine.

At this moment I have a torquemaster lower unit on my current engine. Current top speed is 76-78 mph. Expected top speed is 85-88 mph.

According to Merc Hi Performance the Torquemaster is safe into the low eighties. Should I swop to a nose coned unit? And if so - a Sportmaster with straight skeg or a Bobs nose coned unit (I have one spare). Which is fastest?

Have a nice summer!

Cheeers, Toffen G
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Old 07-10-2003, 07:22 PM
Join Date: Dec 2002
Location: chesapeake bay md
My Boats: 30 motion ob
Posts: 959

Toffen I am not sure about the Bobs unit but my stock 300pm sportmasters have seen over 109mph with no problem. Depends a lot on motor height. I do think you would be much better off If you could trade that 300pm for a pair of280hp 2.5s due to the size and weight of your boat . I know you have worked hard on this project and I wish you the best of luck.
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