Voo-doo/Merc 40

My Name Is Corey Pepper and I have a 91' VooDoo with a 4 inch manual jackplate and a 40hp Mercury 2 stroke 4 cyl. I need to know where to set the motor in relation to the bottom of the boat and the chunk cut out of the bottom. I also need to know what prop and where to get it. I tried a 10 3/8 X 14 vengeance last season and over reved the motor, I think I may have blown
the 3rd cylinder. Do you know of any repair shops in the toronto area? I also want to tweak the motor for higher RPM's, about 6000.




 Sorry to here of the possible blown motor. I doubt it was from high rpm's. You can turn the 4 cylinder Merc's at 6600 plus and they work fine. I'd start with the propshaft at 2" or so below the bottom and find a 15 pitch prop. You'll probably need the prop modified to see the ultimate speed but even stock it should work fine. Never been to Toronto so can't help there. Try and find a 50 or 45 Merc used. You should find one cheap and the block/powerhead is the same.

Good luck,




Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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