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Author Topic:   REVENGE 25 WD: Re-power with Yamaha 225

grizzly posted 01-18-2007 11:17 PM ET (US)
[Give me comments] on re-powering [a classic Boston Whaler REVENGE 25 Whaler Drive] with twin Yamaha 225-HP fuel-injected two-stroke motors. These engines are new, non-current units, and are not the HPDI model. I think [a classic Boston Whaler REVENGE 25 Whaler Drive] is rated for 450-HP, so this power should be within maximum rating.
How would [a classic Boston Whaler REVENGE 25 Whaler Drive] perform with these [twin Yamaha 225-HP fuel-injected two-stroke motors]?
The current power is c.1980 twin Yamaha 150-HP motors.
cwyllie posted 01-22-2007 08:51 AM ET (US)
[Proposes that the boat should be re-powered with different motors that total 500-HP and offers to sell those motors--please use MARKETPLACE to advertise items for sale--jimh]
If you ask around you'll find that the horsepower transom rating is formula driven and is not a reflection of a safety factor.
jimh posted 01-22-2007 09:57 PM ET (US)
Boston Whaler boats tend to perform very nicely when powered at their maximum horsepower. With twin 225-HP motors you ought to be able to cruise at very moderate engine speeds, which should give you many benefits.
jimh posted 01-22-2007 10:03 PM ET (US)
Regarding "asking around" about powering a boat with more horsepower than the manufacturer's rating certificate allows, you can find a rather thoughtful discussion of that topic at
http://continuouswave.com/whaler/reference/ratedHP.html
I think it goes without saying that the entire purpose of having a boat carry a maximum horsepower rating is to provide SAFETY. The motivation for these ratings is from the Federal Boating Safety Act of 1972, not from some formula in a textbook. If you read my article you'll have a better understanding of the process.
grizzly posted 01-25-2007 05:38 PM ET (US)
Thank you for the edits Jim.
Can anyone comment on the classic 25WD hull with twin 225 2 strokes of any brand? I did a search on the site, but all I can see are references to twin 200's or twin 150's, which seem to be the most common set-up. It seems to me the extra weight of the Revenge (compared to the Outrage) and the whaler drive would benefit from some more power.
I don't really want the weight of four strokes, so another option would be e-tec 150's or 200's.
Tates posted 01-25-2007 10:42 PM ET (US)
Grizzly,
I have twin 200 optis on my 25 WD HT, WOT is 43-45mph , The only surprise was the whalerdrive & scuppers go awash often from the weight,( @ low speeds & in rough conditions) With two strokes you can get the max hp for the boat. ( mine is 400HP). If you went 4 strokes you would have less HP for the same weight.Probably twin 150's would work weight wise ,but you are a 100hp less.
Have fun
grizzly posted 02-02-2007 10:35 PM ET (US)
Tates, what kind of fuel usage are you getting with the twin Opti 200's?
Tates posted 02-05-2007 08:21 PM ET (US)
According to the smart craft gauges the best I've got is 2.4 MPG @ 3800 RPM 25 mph +-, the average is closer to 1.7 mpg. The smart craft gauges are not tied to the GPS though.
Tom W Clark posted 02-06-2007 12:00 AM ET (US)
Only 2.4 MPG? Are you kidding me? My Revenge 25 WT with old twin carburetored Mercury 150s gets 2.3 MPG at cruise. I would have thought a pair of Yamaha 200 HPDIs would do significantly better.
Peter posted 02-06-2007 08:48 AM ET (US)
Tom -- Two things to consider. 1) The fuel economy difference between a carburated/EFI 2-stroke motor and a DFI 2-stroke or a 4-stroke at cruising speeds often is not that great. Fuel economy at idle speeds is where the greatest difference lies between the conventional 2-stroke and DFI 2-strokes or 4-strokes. 2) Tates has a Whaler Drive.
Who mentioned Yamaha HPDIs? By the way, the HPDIs are the least efficient of the DFI outboards because they don't use stratified charging at low engine speeds.
Tates posted 02-09-2007 08:39 AM ET (US)
Tom Clark
The smart craft has been extremly accurate on total fuel consumption, Normally witin a .5 gallon on fill up.As far as mpg its always a toss up, depending on how accurate your distance is calculated.
AlexH posted 02-24-2007 01:38 PM ET (US)
I have a 1989 Outrage 25' Cuddy w/Whaler Drive with two 1998 225 Yamaha OX66 2-strokes. Here is a link to a previous descussion where the perfomance of this combination is metioned; scroll about two-thirds of the way down.
[ur]http://continuouswave.com/ubb/Forum4/HTML/003031.html[/ur]
AlexH posted 02-24-2007 01:39 PM ET (US)
the link:
http://continuouswave.com/ubb/Forum4/HTML/003031.html

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Author	Topic: REVENGE 25 WD: Re-power with Yamaha 225
grizzly	posted 01-18-2007 11:17 PM ET (US) [Give me comments] on re-powering [a classic Boston Whaler REVENGE 25 Whaler Drive] with twin Yamaha 225-HP fuel-injected two-stroke motors. These engines are new, non-current units, and are not the HPDI model. I think [a classic Boston Whaler REVENGE 25 Whaler Drive] is rated for 450-HP, so this power should be within maximum rating. How would [a classic Boston Whaler REVENGE 25 Whaler Drive] perform with these [twin Yamaha 225-HP fuel-injected two-stroke motors]? The current power is c.1980 twin Yamaha 150-HP motors.
cwyllie	posted 01-22-2007 08:51 AM ET (US) [Proposes that the boat should be re-powered with different motors that total 500-HP and offers to sell those motors--please use MARKETPLACE to advertise items for sale--jimh] If you ask around you'll find that the horsepower transom rating is formula driven and is not a reflection of a safety factor.
jimh	posted 01-22-2007 09:57 PM ET (US) Boston Whaler boats tend to perform very nicely when powered at their maximum horsepower. With twin 225-HP motors you ought to be able to cruise at very moderate engine speeds, which should give you many benefits.
jimh	posted 01-22-2007 10:03 PM ET (US) Regarding "asking around" about powering a boat with more horsepower than the manufacturer's rating certificate allows, you can find a rather thoughtful discussion of that topic at http://continuouswave.com/whaler/reference/ratedHP.html I think it goes without saying that the entire purpose of having a boat carry a maximum horsepower rating is to provide SAFETY. The motivation for these ratings is from the Federal Boating Safety Act of 1972, not from some formula in a textbook. If you read my article you'll have a better understanding of the process.
grizzly	posted 01-25-2007 05:38 PM ET (US) Thank you for the edits Jim. Can anyone comment on the classic 25WD hull with twin 225 2 strokes of any brand? I did a search on the site, but all I can see are references to twin 200's or twin 150's, which seem to be the most common set-up. It seems to me the extra weight of the Revenge (compared to the Outrage) and the whaler drive would benefit from some more power. I don't really want the weight of four strokes, so another option would be e-tec 150's or 200's.
Tates	posted 01-25-2007 10:42 PM ET (US) Grizzly, I have twin 200 optis on my 25 WD HT, WOT is 43-45mph , The only surprise was the whalerdrive & scuppers go awash often from the weight,( @ low speeds & in rough conditions) With two strokes you can get the max hp for the boat. ( mine is 400HP). If you went 4 strokes you would have less HP for the same weight.Probably twin 150's would work weight wise ,but you are a 100hp less. Have fun
grizzly	posted 02-02-2007 10:35 PM ET (US) Tates, what kind of fuel usage are you getting with the twin Opti 200's?
Tates	posted 02-05-2007 08:21 PM ET (US) According to the smart craft gauges the best I've got is 2.4 MPG @ 3800 RPM 25 mph +-, the average is closer to 1.7 mpg. The smart craft gauges are not tied to the GPS though.
Tom W Clark	posted 02-06-2007 12:00 AM ET (US) Only 2.4 MPG? Are you kidding me? My Revenge 25 WT with old twin carburetored Mercury 150s gets 2.3 MPG at cruise. I would have thought a pair of Yamaha 200 HPDIs would do significantly better.
Peter	posted 02-06-2007 08:48 AM ET (US) Tom -- Two things to consider. 1) The fuel economy difference between a carburated/EFI 2-stroke motor and a DFI 2-stroke or a 4-stroke at cruising speeds often is not that great. Fuel economy at idle speeds is where the greatest difference lies between the conventional 2-stroke and DFI 2-strokes or 4-strokes. 2) Tates has a Whaler Drive. Who mentioned Yamaha HPDIs? By the way, the HPDIs are the least efficient of the DFI outboards because they don't use stratified charging at low engine speeds.
Tates	posted 02-09-2007 08:39 AM ET (US) Tom Clark The smart craft has been extremly accurate on total fuel consumption, Normally witin a .5 gallon on fill up.As far as mpg its always a toss up, depending on how accurate your distance is calculated.
AlexH	posted 02-24-2007 01:38 PM ET (US) I have a 1989 Outrage 25' Cuddy w/Whaler Drive with two 1998 225 Yamaha OX66 2-strokes. Here is a link to a previous descussion where the perfomance of this combination is metioned; scroll about two-thirds of the way down. [ur]http://continuouswave.com/ubb/Forum4/HTML/003031.html[/ur]
AlexH	posted 02-24-2007 01:39 PM ET (US) the link: http://continuouswave.com/ubb/Forum4/HTML/003031.html