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Author Topic:   1992 21 WALKAROUND Engine Mounting Height
acseatsri posted 02-22-2014 02:56 PM ET (US)   Profile for acseatsri   Send Email to acseatsri  
How high up are other owners mounting the engine on a 1992 Boston Whaler 21 WALKAROUND? The dealer mounted it one-hole-up after I explicitly told him two-holes-up. It looks like it could easily go at least one setting higher. On my OUTRAGE 22 with E-TEC 225-HP, the engine is mounted on the highest set of holes. [Three-holes up]
Tom W Clark posted 02-22-2014 03:02 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
What motor?
martyn1075 posted 02-22-2014 04:34 PM ET (US)     Profile for martyn1075  Send Email to martyn1075     
I think I remember another thread on Continuous Wave about a fellow who mounted his to the highest hole possible was best. It was a 225-250 Etec and it was originally mounted one down from the top but it apparently was not operating all that well. Prop was 19p

I would think the top holes would be the correct way on mounting a V6 25 inch shaft motor to this model.

acseatsri posted 02-22-2014 05:18 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
Sorry, Honda BF250.
Tom W Clark posted 02-22-2014 05:25 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The BF250 has five (5) sets of mounting holes. The motor should be mounted at least Two Holes Up if not Three Holes Up.

It is currently only One Hole Up.

What propeller are you using?

acseatsri posted 02-22-2014 05:34 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
The propeller that came with is is a Michigan Wheel 19P. I'm looking at swapping it out for either a REV4 or one of the new Enertia ECO props. Still 6 weeks away from a sea trial (due to a foot of snow on the ground.
Tom W Clark posted 02-22-2014 06:10 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
BF250s do not come with anything. The dealer may have stuck a Michigan propeller on there but it's not from the Honda Propeller catalog.

If using a Revolution 4, mount the motor three holes up:

o <--Mounting bolts through this hole

acseatsri posted 03-06-2014 06:11 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
If I were to order an Enertia ECO 16 x 19, would you still go this high, or would you drop down 1 hole? I'll know how the Apollo 14 5/8 x 19P performs in another month or so and don't feel like hauling it a 2nd time to lower the engine if it's too high.
Tom W Clark posted 03-07-2014 10:24 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Bill -- I cant answer that. I've never tested an Enertia ECO, not have I even heard of anybody who has. In fact, as far as I know it is not available to purchase yet, even though it was announced last fall.

Given its large diameter one might speculate that the motor ought to be a tad lower so the blade tips do not come out of the surface of the water too much, but my personal experience with propellers is that you will not know how they perform, event though you may have read and heard of all sorts of claims and regurgitated marketing bluster, until you try them on your own boat.

acseatsri posted 05-27-2014 08:14 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
The engine is now mounted in the hole that Tom suggested (3 holes up) and running the original Michigan Wheel Apollo 15 1/4 x 19P prop. It tends to break loose sometimes when running in heavier seas, probably needing to go back down 1 hole. Tops out around 47-49MPH, best economy is about 20-30 MPH with numbers running 4.1-4.5 MPG. This Honda BF250 is absolutely AWESOME in both economy and noise level, the most prevalent sound is gear/belt noise.

After a decent amount of running, I've also determined that this boat NEEDS about 200 lbs of weight in the bow. With a 200 lb friend standing on the anchor locker, the bow is about 10" lower, the splashwell drains are out of the water, it drifts in a better attitude, and it doesn't need as much trim tab when running at lower speeds. More importantly, the rear access plate in the splashwell isn't submerged all the time with a near full tank of fuel. I'll post more performance numbers when I get a calmer day.

Tom W Clark posted 05-27-2014 08:30 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Before you adjust the motor height again, I encourage you to try a Revolution 4 and/or Enertia. You may be surprised.

Michigan Wheel does not make a propeller to fit a 250 HP outboard that I can recommend.

Teak Oil posted 05-27-2014 09:25 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
I ran an Enertia Eco with a motor mounted high on my Outrage and it ventilated pretty badly. The huge blades grab air pretty easily when mounted high.

Also, depending on your gear ratio, the 19" Eco may be too tall. These props run with 0% slip.

acseatsri posted 05-28-2014 05:02 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
Teak Oil,
I'm already close to the 6300 rev limit (6150-6200) with a fairly heavy load. For now, I'd like to get the boat balanced more evenly with the 200 lbs of lead in the bow and do more testing.

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