Prop Selection 22'2" with 89 Johnson 225

[Teapot]

Trying to dial the prop in for Fuel ecomony and bow lift

currently

3 blade 14 1/2 X 19p dinged up a bit

wide open throttle 5200 rpm WOT seems low?

top speed 37.5 mph

about 1.3 miles per gallon at vering spedds with a 6gallon tank and gps for
miles covered

i like cruise in the 25 to 30 mph 3000 to 4000 rpms
fish in galveston bay and near shore gulf of mexico

was thinking a 4 blade 14 X 20p or ? ideas input is welcomed i dont want to waste all my money on the gas pump would rather buy new fishing gear:redface:

Teapot

 

[Dhadley]

Re: Prop Selection 22'2" with 89 Johnson 225

That's usually the pitch we use on that combo but you're down on top rpm by quite a bit. Are you sure the motor is running right? How's the set up? Can the motor be raised any?

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

How should the foot line up to the bottom of the boat?

The horizantal fin even with the bottom of the boat? or ?

Thanks Teapot

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

here is a pic of my setup

engine is all the way down
http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00335.jpg

reffence to how the horizantal fin is to bottom of boat engine all the way down
http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00336.jpg

and about where i run at
http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00337.jpg

got lots of room to move up just just have to move to different mounting holes on engine

so thoughts are the engine is to low?

Thanks teapot

 

[hwsiii]

Re: Prop Selection 22'2" with 89 Johnson 225

Teapot, your motor is wayyy too low, and Dhadley will get your setup right for you.



H

 

[Dhadley]

Re: Prop Selection 22'2" with 89 Johnson 225

Yep, looks low to me too. Can you post a pic of your prop?

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

Here are some pice with the engine down

http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00345.jpg

http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00348.jpg

http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00349.jpg

http://gi168.photobucket.com/groups/u184/K15328JXO4/DSC00350.jpg

so about how low do you estimate it is or where is the sweet spot for mounting ?

Thanks Teapot

 

[Dhadley]

Re: Prop Selection 22'2" with 89 Johnson 225

You may be able to go up a little with that prop but probably not much. Looks like the tip cup is pretty well worn. I might be inclined to try it up a little but if you were considering another prop I'd probably get the prop first.

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

so what would you recomend for size and pitch? i was thinking smaller diamter and higher pitch currently it has a 3 blade 14 1/2 X 19p. have read that a 4 blade has better mid range ecomony and bow lift.

input is welcomed


Teapot

 

[Dhadley]

Re: Prop Selection 22'2" with 89 Johnson 225

We've had good good success with the standard Stiletto or Turbo 3 blades on those boats without jackplates. With jackplates we use the Turbo 4 blade.

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

Had my buddy take the helm while i was looking at the foot the Horizantal fin is underwater when running by little over a inch i would say. Figure i will get a manual Jack Plate and try to dial in the corect engine hieght. Could that be the reason for the low WOT rpm still 5200 is all she has ideas?

Teapot

 

[Dhadley]

Re: Prop Selection 22'2" with 89 Johnson 225

At this point I might start looking at the motor itself. Raising the motor is going to / needs to happen but while you're establishing your baseline you need to make sure the motor is giving you 100%. Even if the motor is a little low there's a possibility it should be at more than the 5200. A healthy 3 liter open deck looper should turn a bit more than 5200 with a standard 19" prop on that boat even if it's low.

There may be other factors but now would be the time to confirm the motor is all it can / should be.

 

[Teapot]

Re: Prop Selection 22'2" with 89 Johnson 225

Raised the engine 2 bolt holes not quiet enough though 1 more should be it.
Engine WOT rpm unchanged considering a carb clean/rework fellas at alvin marine want 600 for the service . Went through the entire electrical system recently on this thread http://forums.iboats.com/showthread.php?t=368353 so carbs will be the next step right?

Thanks
Teapot