WOT on 84 evinrude 115 ????

[crazy charlie]

I recently bought a 17ft. Mako with a 115 evinrude 1984.It runs great and the compression is great.I think it may have the wrong prop on it because it takes a little while to get on plane and then goes like a rocket and runs at about 4200 rpm but has way more left to go,over 5000 I would say.At about 37-3800 it can begin to come off plane.Cant find #s on prop and I tried a doel fin.Any Ideas on the wot range??? Charlie

 

[DJ]

Re: WOT on 84 evinrude 115 ????

Crazy,<br /><br />The operating range for that engine is 4500-5500.<br /><br />You do not want to "lug" it, as you are doing.<br /><br />I would prop it to run about 5500 with a very light load. That will put you around 5K with a moderate to heavy load.<br /><br />You can figure that each inch of prop is worth 200 rpm's.<br /><br />I would start with a 13 1/4" X 15". That is a heavy boat.

 

[KennyKenCan]

Re: WOT on 84 evinrude 115 ????

Do what djohns19 say's, because you definitly have the wrong prop on there!

 

[crazy charlie]

Re: WOT on 84 evinrude 115 ????

Thanks for the reply guys,I did not realize the 115 was designed to run at that high rpm.My other boat is a larger i/o and at3400 rpm I am moving nicely.The problem may be me .I usually back off the throttle when it gets near 4500.I guess I shouldnt.I will have to peg it to see if I top out at 5500. Charlie