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Author Topic:   Yamaha HPDI vs 4-Stroke
Outrage2795 posted 06-30-2004 08:33 AM ET (US)   Profile for Outrage2795   Send Email to Outrage2795  
I have seen discussion concerning 4 strokes, but I rarely see mention of the Yamaha HPDI engine from Yamaha. What are the pros/cons of repowering a Whaler with a Yamaha HPDI? In my case, re-powering a 1986 Outrage 18 with a 150 HP.
macfam posted 06-30-2004 09:42 AM ET (US)     Profile for macfam  Send Email to macfam     
My brother has a 2000, 200hp Yamaha HPDI on a 22 ft.
Flawless so far.
Quiet at idle, but not nearly as quiet as a 4-stroke.
Very little if any blue smoke at start-up, after that none detected.
Runs smooth as silk at all ranges.
Quick acceleration as expected. Excellent fuel/oil economy.
A very nice motor.
At the price of modern outboards, this is exactly what one should expect.
Bigshot posted 06-30-2004 10:55 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
If I had to repower today, it would be a hard decision between a 225 Ficht and a 225 Suzuki/Johnson 4 stroke.....real hard.
Rick U posted 06-30-2004 11:49 AM ET (US)     Profile for Rick U  Send Email to Rick U     
Many people making that decision compare the weights. If the heavier 4-stroke engines are a concern, look at the battery requirements for the HPDI engine. They require high reserve amps, which means bigger (heavier) batteries. I have seen lots of threads comparing the technologies but no one mentions that the HPDI are not much lighter when you include the batteries.
Salmon Tub posted 06-30-2004 12:33 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I would say [the preference for HPDI over 4-stroke] depends on the use. For fishing, I would lean toward a 4-stroke, for general boating, skiing, I would go with the [HPDI].
lae posted 06-30-2004 04:09 PM ET (US)     Profile for lae  Send Email to lae     
I am running an Yamaha 250-HP HPDI on an 1982 Outrage 25. With 40 hours on it, I am very happy. It runs close to 50-MPH and loping along in the zone gets better than 3 MPG. The MPG figure is based upon a 100 mile round trip river run, so should be close. While not as quiet as a four-stroke engine, the HPDI engine is amazingly [strong] and [the boat] jumps on step with 14 people and runs alomost 40 with that load.
jimh posted 07-01-2004 12:12 AM ET (US)     Profile for jimh  Send Email to jimh     
[Administrative post]
gf posted 07-01-2004 08:35 AM ET (US)     Profile for gf  Send Email to gf     

I love my Yamaha 150 HPDI. It's quiet, unbelievably fuel efficient and has performed flawlessly.

That said, however, if I were shopping today, I would purchase the Yamaha F150 4-stroke.


The F150 is actually a few pounds lighter (it's a 4 cylinder engine versus the V-6 HPDI), it's also about $500 less expensive. More importantly, however, resale value will strongly favor 4-stroke engines in the future.

handn posted 07-11-2004 06:31 PM ET (US)     Profile for handn  Send Email to handn     
No question, choose a four stroke. 4 stroke Advantages: quieter and cheaper to run. Disadvantages: four strokes weigh a little more and have slightly less power.
I have run both: a 225 Optimax on a 23 ft. Conquest and twin 225 Mercury (Yamaha) four strokes on a 305 Conquest.
With four strokes I can carry on a coversation at planning speed, don't have to use a gallon of $22 Optimax oil every 100 nautical miles or use $20 platnum spark plugs. As a hidden bonus, there is much less vibration with four strokes and I don't have to go through the boat every ten hours and tighten all the loose screws.
MyOutrage posted 07-12-2004 12:57 PM ET (US)     Profile for MyOutrage  Send Email to MyOutrage     
For what it's worth, I'm in the 4 Stroke camp. I think it's a superior product with proven technology and the future of outboards. That said, I just went through re-powering my 18' Outrage and opted for a used 2 Stroke. I'm looking for a little more time to pass to see what happens w/ weight and "out of the hole" speeds. Unlike some, I'm a very slow adopter of change...
Ketch posted 07-12-2004 09:32 PM ET (US)     Profile for Ketch  Send Email to Ketch     
I recently sold an Edgewater 185cc with a Yamaha 150 HPDI. I have nothing but great things to say about the engine. The HPDI is extremely quick, reliable, fuel efficient and exceptionally quiet for a 2 stroke. That being said, the new Yamaha 150 4 stroke is lighter and quieter. While the HPDI is quicker out of the hole, the 4 stroke actually has a slightly higher top end speed. I agree with the prior comment regarding the resale advantages of a 4 stroke. When selling the Edgewater, the first question every potential buyer asked was whether the engine was a 4 stroke and almost every potential buyer was turned off when I informed them that the HPDI was a 2 stroke. My experience was that the more fishing/water sports oriented buyers were attracted by the HPDI engine. I recently purchased a new boat with a Yamaha F225 and am very happy with the engine and truly appreciate the 4 stroke technology. However, I'd be lying if I said that I didn't miss the acceleration and power of the HPDI.
jimh posted 07-14-2004 09:49 PM ET (US)     Profile for jimh  Send Email to jimh     
Do you miss not having to change the oil on the HPDI?
Ketch posted 07-15-2004 12:31 AM ET (US)     Profile for Ketch  Send Email to Ketch     
Not having to worry about the oil level is definitely an advantage of the 4 stroke, but the HPDI's are far less thirsty when it comes to oil than the Yamaha Saltwater Series engines. As much as I like the 4 stroke, I wouldn't hesitate to buy another HPDI if I planned on keeping the boat for a while and resale value was less of a consideration.
Peter posted 07-15-2004 07:37 AM ET (US)     Profile for Peter  Send Email to Peter     
Don't you still have a worry about oil level in a 4-stroke? If I remember correctly, in some cases a few 4-stroke users have had some worries not about decreasing oil levels but increasing oil levels.

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