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ContinuousWave: Whaler Performance
1989 Revenge w/225 Yamaha Prop Article
|Author||Topic: 1989 Revenge w/225 Yamaha Prop Article|
posted 04-04-2004 02:57 PM ET (US)
There's a article in the April issue of Motorboating detailing prop selection after repowering a 1989 22' Revenge with a 225 Yamaha. Article has some stats that some of you guys might find interesting.
posted 04-05-2004 05:07 PM ET (US)
I checked out the website and you can read/print the entire article. Very interesting.
I compared the results to repowering my 1990 Revenge 22 WT with a 2003 Merc 225 Optimax DFI last year. I was surprised that my DFI 2-stroke gets similar fuel efficiency compared to the Yamaha 4-stroke. At least that's what the numbers look like. I always thought the 4-stroke was about 10% better. As a side note, my old 1989 carbed 225 Johnson 2-stroke got 2 mpg at 24 knots.
In only one case did the 4-stroke beat the DFI (with 19" Black Max aluminum 3-blade). That was with the 4-stroke using a Ballistic 14-3/4 x 17 stainless: 32.7 mph at 4500 RPM and 3.85 mpg. My Opti runs at 31.9 mph at 3740 RPM and 3.62 mpg. The 4-stroke tied the DFI with the 4-stroke using a Rapture 14-1/4 x 21 stainless. In that case the 4-stroke runs 31.5 mph at 4000 RPM and 3.62 mpg. In all other cases, the DFI beat the 4-stroke.
The author of the Motorboating article concludes that it is very expensive to test a number of props (unless you can get loaners).
posted 04-05-2004 06:33 PM ET (US)
I have a 1996 Johnson 225 carbed 2 stroke.....do you think Jimp's 2mpg at 24 kts for the 1989 version would be about the same for me?
posted 04-05-2004 07:59 PM ET (US)
That's about what I average with my rebuilt 1982 Johnson 235, but at 28 mph or so. Pretty good estimate.
I need to check out that article.
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