Valero/Merc 175 Setup

Randy,

I spun my prop last fall and need info on recommended props to replace it. I had a round eared 29 pitch that turned hi 7000rpms.

The motor is solid mounted 3"above transom so that when the engine is all the way trimmed down the prop is flush with the bottom of the hull. I would like to get the rpms lower where they should be...58-63. Any help or advice will be great. Some say a Mazco re30 would lower the rpms but my 175 wouldn't turn it?

What do you think? 

Kurt J. Schroeder

 

Kurt, 

    Almost every Valero I have ever set up with a 175 works very well with a 14 1/2x26 Merc Chopper or Chopper II. If the boat is setup properly, you will only be able to spin that prop in the low 6's. The Valero has a 24 transom height to begin with. If you are 3 inches above this, you are at 27 inches. This would explain your excessive RPM with the 29. You need to be set at about 25 or 1 inch above the transom. This will give you good overall performance with the 175. Not only will you be quicker, but your arms will be happier too (less torque in the wheel). Try this setup as I have used it on over 25 Valeros. 

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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