Vector/Merc 150 V6 needs Speed


I am an IHR member and own a '78 Vector with a 2.0L 150 V6 Merc.  The motor has been completely rebuilt top to bottom.  Bored .20 over forged pistons etc. etc. All electronics have also been replaced.  Motor runs very well. I have the motor on 6" Bobs Hydraulic Jack plate and am running a 27" Laser 2 Propeller.  Motor turns 6,000 rpm at full tilt. 

I recently purchased a GPS and was extremely disappointed at the speeds that I was attaining.  No matter what I seem to do I can't get the boat above 64 mph even with a very small amount of fuel in the boat.  There seems to be an awful lot of the boat still in the water even at high speed.  Friends have watched and say there is a good three ft of boat still in the water.  I had read that this was a great prop for this boat but now am not sure if that's the case. 

Just wondering if had any advice for me.

Thank you
Brett Cleverdon

Ajax, ON Canada


Try finding a small hub 26 pitch Lazer II or a 26" or 28" Merc Chopper. The 27 Lazer II has small blade area and the large hub combined with that is not lifting the boat. I would expect 72-75 mph with your combo. The small hub Lazer has a much better pitch layout and parabolic make just like the choppers. This works better on the boat you have. Lastly, make sure the boats balsa core is not wet. If the hull is flexing, the speed will never come. Hope it is just the prop. 




Please submit whatever questions you have to  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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