70hp evinrude prop

[miichael18]

I have a 1974 70HP evinrude and i bought a tach and put on it and at wide open throttle it tachs 5600RPM. Reason i Purchased a tach was because i am in need of a new propeller. Mine is aluminum and is in very rough shape. Is taching 5600 rpm fine for this motor or should i try to get a different size/type of prop? I was going to just change the prop to a stainless steel same pitch and diameter but i wasnt sure what my wot rpms was. Right now the boat run 29mph on water if i add a stainless steel prop with the same pitch and diameter will it increase my speed? or should i just go with another aluminum?

 

[tashasdaddy]

Re: 70hp evinrude prop

not a prop specialist, but if you are getting good performance with what you have, just replace it. save the bucks for gas. to me that shiny prop is just more BLING.

 

[JB]

Re: 70hp evinrude prop

Moving to the Prop forum.

 

[miichael18]

Re: 70hp evinrude prop

how do i tell what pitch/diameter prop mine is? i havent took it off but i looked it over and seen no numbers or anything.

 

[rickdb1boat]

Re: 70hp evinrude prop

Once you remove it, hopefully there will be some numbers stamped into the hub. Otherwise, if you can post a picture of it, there are those here that can narrow it down pretty good...

 

[rickdb1boat]

Re: 70hp evinrude prop

 

[Texasmark]

Re: 70hp evinrude prop

I agree on keeping what you have if you are happy with it...i.e. buy an exact replacement.<br /><br />Mark