Johnson. Factory prop vs aftermarket size difference

[9758JB]

Hello. I have a jonhson 70 and current prop is a 13 3/8 x17. I noticed I can only find new props that are 13 1/4 x17. I figured this is a omc thing where the after market cannot be the same? Will this 1/8 inch difference show any noticeable performance issues? What about increase in rpms? Thanks

 

[jimmbo]

5 - 10 rpm difference if that
As said many times before, Let the Prop engineers worry about Diameter

 

[9758JB]

Right.. I didn't
know if it would be worth getting an Omc or trying to find one. But it sounds like its nothing to worried about

 

[jimmbo]

BRP makes some very good Props. They have to, if a motor performs poorly because of a Poorly Designed Prop, what going to get Blamed? The Motor, not the prop, unless the engine was run Prior with a well performing Prop.
Mercuy for years, has been one of the World Leaders in Propeller Design. I myself. run a Mercury Prop on my Volvo Penta Stern Drive, Prior to it, I used OMC Props on it.

 

[9758JB]

My local marina sells SOLAS props. Are those any good, or better off ordering online?

 

[jimmbo]

Solas sponsors this particular Forum...
Some people swear by them, other will swear at them. The Solas Props that I’ve seen, looked like Decent Props. My cousin had one on his boat, appeared to perform as well as any 3rd Party Prop