225 Honda v. 250 HPDI: Performance Numbers

[zup]

Just got the boat back after the changeout here is how the number stack up.

Honda
Prop 15X15.5 Mirage Plus
Cruise 4200 RPM, 29 MPH
WOT 5900 RPM, 39 MPH

HPDI
Prop 19x15 Yamaha Saltwater Series
Cruise 3300 RPM, 30 MPH, 8.2 GPH
WOT 5100 RPM, 48 MPH, 20.7 GPH

All MPH are per GPS and are the average of the with v. against the tide. One person on board, 120 gal. fule and minimal equipment.

I loved the Honda as far as smoothness and quietness. But the HPDI feels more like an extra 50 hp instead of the 25 hp difference in the rating. The boat plans considerably faster and punching it once on plane will sent your occupants flying.

[HOTSPOT]

What were the fuel numbers on the Honda ?



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HOT SPOT <'})))><<

Sea Pro SV2300 Yamaha F200
Ford F250 SD 4DR 4WD PowerStroke

[zup]

I ment to put that above. I did not have a Fule management guage on the Honda, so all I can do is give you my best guess, based upon filling the boat up after a trip and the Honda performance sheets.

The Honda is better from idle to 2000 RPM, the same from 2000 until about 4250, and better from 4250 to WOT. Over all based upon RPM the Honda is about 10% more fuel efficent. Based upon MPG i think they are very close, with the edge going to the Honda in the 2000 RPM and under range.

Don't get me wrong i love the Honda. But for a 22' and up boat with a single engine i think the 2 stroke is still the way to go. Once the bigger 4's and the supercharged versions come out the decision would be much harder.

In my oppinion if I were rigging a single engin on a boat over 2600 lbs it would be a 2-stroke. If I were rigging on a lighter boat it would be a 4 stroke unless performance is critical (i.e flats boat, bass boat etc). For twin application where perfromance is not critical it is 4 stroke all the way.

[HOTSPOT]

Thanks for the info !!



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Sea Pro SV2300 Yamaha F200
Ford F250 SD 4DR 4WD PowerStroke

[fish factory]

"...and punching it (HPDI) while on plane will send occupants flying" My sentiments exactly. Not bashing 4-S, I have one now.

There's a lot to be said for HPDI. Yamaha mechanic recently described it "That's Yamaha's hot-rod motor"!

TURN UP THE PRESSURE!

[sundancekid]

The DFI 2-strokes definately have a lot more power than the 4-strokes. I would try a 17p prop on that because 5100 is definately a little low, 5600 is optimum so a 17 should get you pretty close. Anyway, good luck with the new motor and enjoy!


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[KevinM]

The HPDI is rated from 4500 to 5500 with max HP at 5000rpm, you are fine with the current prop.