RPM and Motor Height for Vegas

Randy 

I recently bought a 96 hydro-x Vegas with a 88 150 merc on the back. What I was wondering is what prop would be my best bet to buy. I was thinking around the 24pitch 3 blade area. I have a 24pitch 4 blade ski prop on it now but I am looking to get more out of it on the top end. I run 5300 on the tach so I think that's about right for RPM's. The next question I have is. How high should my motor be set at? The boat has a manual jack plate. The jack plate has about 3/4" of adjustment left to the top. The motor is bolted to the jack plate through the first hole. (The top) I am thinking about dropping it down one or two holes. Would this be a good thing to do or bad thing to do? The boat doesn't feel like it's up out of the water enough when it is fully trimmed up and on plane. Maybe it's just me? I am used to my old 77 viper with a 115 Johnson. Will bringing up the motor one or two holes make me a little quicker? What are some speeds I could expect to see with this setup?

Thanks much
Adam

Adam, 

Try raising it up one hole at a time. Do not buy a prop until the rpm gets to 5900 with the one you have. Hopefully, the speed follows and you pick up 8 - 10 mph. You should be in the mid to upper 60's with the engine in the high 5's for rpm. Based on the results, then a new prop can be figured out. 

Randy

 

 

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.

Thanks,
Mark C.

 

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