100hp to 115hp powerhead = new prop pitch?

[cdoliver]

Hello, I'm in the process of replacing a bad powerhead. It's a 1979 100hp johnson that I'm putting a 1979 115 johnson powerhead on. Is there any need to change the prop pitch with this HUGE jump in HP??? (kidding) The old prop is in need of change/repair. Thanks for the advice.

 

[Bondo]

Re: 100hp to 115hp powerhead = new prop pitch?

Ayuh,..... There's Only 1 way to Know,.... Splash it,+ See......

 

[steelespike]

Re: 100hp to 115hp powerhead = new prop pitch?

Hello,Get your prop repaired Do some test runs and get back to us with Boat size and type,typical load,prop size(aluminum,stainless),max rpm and speed.
Only way to tell what you need.

 

[Dhadley]

Re: 100hp to 115hp powerhead = new prop pitch?

You've got the same bore & stroke, same intake & reeds, same pistons, rods and crank, same ignition and same gear ratio. You may be using the same carbs. The port timing may be the same or only a tiny bit different at best. Same exhaust, same tuner, same adaptor plate.

My guess is that you'll not see any difference.