Johnson 115 prop selection

[oscar boy]

I have a 94 115 Johnson an I am looking at a raker propeller. (13.5 x 18.) What is the advantage or a Raker prop compared to an regular stainless steel prop. I have found one in good shape an for a good price.<br /> Does the raker prop affedt the rpm of the motor differently than the regular stainless steel of the same pitch.

 

[marinemech]

Re: Johnson 115 prop selection

rakers r high preformance bow lifting props<br />try it on your package and look at max rpm if in range and preformance good you r ok if not in range too bad

 

[Dhadley]

Re: Johnson 115 prop selection

Rakers are great props that require a slightly high X dimension and can be a real help in getting better efficiency. The road to better performance or efficiency is like taking a trip. We need a map. We have to know where we are now to figure out how to get where we want to be.<br /><br />Tell us more about your present set up and numbers. We'll see where youre at as far as slip % and go from there.

 

[jimmbo]

Re: Johnson 115 prop selection

I ran a Raker on my 150 v6 on a Glastron GS180. My Alum prop was a 14.25 X 19in, and ran 5400 - 5500 and about 49 mph. I put a 14.5 X 22 Raker on, speed went up to 54 mph and rpm droppred to 4800. I then tried a 14.5 X 20 Raker, Speed stayed the same and Rpm went to 5350 rpm. The boat rode higher in the water and was also felt much less like it was plowing.<br /> When I traded this boat and motor in on my current package I kept the prop and had it rehubed so it would fit my Volvo outdrive. I current own 3 rakers for this boat. Just bought 2 a couple of weeks ago

 

[oscar boy]

Re: Johnson 115 prop selection

The prop I am now using is a 13 x19 stainless steel (SST II). The motor only has 16hrs on it after I rebuilt it. I was told by several people to set the timing at 24 deg. not 28 deg. for the break in period. I was also told it was eaiser on the motor if I left it there after break in.<br /> Set at 24 deg the motor will turn 5600 rpm and run abour 43 mph. I never run this fast except to check the prop. My usual running speed is 30 to 35 mph. At 30 mph the rpm is 4000, a speed I find very comfortable for the conditions I usually run in.<br /> The boat is an 18.5 Kenner center console bay boat, the motor is mounted with the ventilation plate about 1 inch below the bottom of the boat.<br />I sometimes have to trim down in turns because the prop seem to lose bite if I don't.<br /> Will the Raker 13x18 give me increased ofer all performance. I am not intrested in gaining a few mile per hour at the top end as it seem many want to do.<br /> I am looking at buying a raker prop that looks in excellent condition for $100. Which is just a little more than what it will cost to repair my old one.<br />thanks for your imput

 

[jimmbo]

Re: Johnson 115 prop selection

The raker is a high speed prop designed to to provide increased bow lift while mounted at high transom heights. It has bigger blades and more rake than the reg SST or Viper to allowing to perform well while not being completely underwater. It responds well to engine trim and holds well in turns. Running really deep in the water is not what it was made for. You would have to raise the engine 2 to 3 inches for best performance of this prop. <br /><br />If the Raker is truly in good shape $100 is a very good price. So low in fact just buy the damn thing and try it. If you aren't happy you haven't spent much to find out a lot about props and you could resell it too.

 

[CalicoKid]

Re: Johnson 115 prop selection

You could do a lot worse than that Raker you're looking at now. It shouldn't change your speed or RPMs much at all but will surely change your handling. I'd guess you'd be able to raise your motor a couple of inches due to the increased "grip" of the Raker. You also might find that you can raise the bow of your boat with less trim than you need now, or that it stays hooked-up better in the turns. You could get a better holeshot due to the exhaust ventilation holes in the Raker.<br /><br />The above is pretty much my experience on my Baja 16' Bowrider and Johnson 110. I went from a Stainless OMC 13 x 19 like yours to a Raker 13 X 20. I also raised my motor up one hole. I am very happy with my current setup and I can do 50mph @ 5800 RPM or I can cruise around at 40 mph all day and get good mileage. I paid around $250 for mine I think. 100 bucks is great!

 

[bassman_n44]

Re: Johnson 115 prop selection

What did you run the Stainless OMC 13 x 19 for rpm?