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Name:	Maverick -	Reply
Subject:	Psycho - 4 Stroke vs 2 Stroke Fule Consumption
Date:	5/27/2010 9:54:15 AM

Yamaha 250 hp on a Ranger Z520

4 Stroke
RPM MPH GPH MPG
1000 5.8 1.4 4.14
1500 7.9 2.7 2.93
2000 8.9 4.0 2.23
2500 24.7 4.9 5.04
3000 31.6 6.5 4.86
3500 36.8 8.9 4.14
4000 43.4 11.8 3.68
4500 53.3 14.7 3.63
5000 61.9 16.1 3.85
5500 69.2 20.0 3.46
5800 73.2 22.3 3.28
Seconds to Plane 4.10

2 Stroke Performance Data
RPM MPH GPH MPG
1000 5.7 2.3 2.48
1500 7.1 4.0 1.78
2000 8.2 6.0 1.37
2500 10.2 8.7 1.17
3000 33.8 8.2 4.12
3500 39.0 11.2 3.48
4000 46.2 12.8 3.61
4500 54.3 15.2 3.57
5000 62.3 18.2 3.42
5500 68.9 25.2 2.73
5700 70.9 25.2 2.81
Seconds to Plane 4.75

URL: Yamaha Performance Bulletins

Name:	Psycho -	Reply
Subject:	Psycho - 4 Stroke vs 2 Stroke Fule Consumption
Date:	5/27/2010 12:35:58 PM

Hey thanks Maverick!...thats what I wanted to know.

Name:	Kizma Anuice -	Reply
Subject:	Maybe Cat can explain
Date:	5/27/2010 4:41:07 PM

the numbers for 2500 rpms. It seems almost impossible that they can be correct.

Name:	Osms -	Reply
Subject:	KA
Date:	5/29/2010 9:45:08 PM

At 2500 the 4 stroke has the boat on plane probably because the prop has a 2" greater pitch than the 2 stroke--look at top end speeds to see prop difference. 2 stroke is not on plane at 2500. Notice how much better gas consumption is at low RPMs on the 4-stroke. Surprised that 4 stroke is quicker to plane than 2 stroke--that's supposed to be the last strong reason for buying a 2 stroke.

Name:	Kizma Anuice -	Reply
Subject:	KA
Date:	5/30/2010 7:00:04 AM

I would be extremely surprised if the horsepower measured at the prop shaft of these two motors is the same.

These test results would indicate to me that the 4stroke is greater horsepower with a different prop.

Or the boats were different or rigged differently.

Name:	Ulysses E. McGill -	Reply
Subject:	Psycho - 4 Stroke vs 2 Stroke Fule Consumption
Date:	5/30/2010 10:57:06 AM

Here are performance sheets for a Yamaha and etec on a Manitou explode.

http://www.evinrude.com/Content/Pdf/neutral/performanceReports/PE692.pdf

http://www.manitouboats.com/uploads/MAN-24XplodeCruise-VF250LA.pdf

URL: http://www.manitouboats.com/uploads/MAN-24XplodeCruise-VF250LA.pdf

Name:	GoneFishin -	Reply
Subject:	Psycho - 4 Stroke vs 2 Stroke Fule Consumption
Date:	5/30/2010 11:39:24 AM

The 4 stroke that was tested is Yamaha’s new VMax SHO high-performance 250 HP four-stroke outboard that was designed to break the two-stroke stranglehold on the bass-boat market. At 505 pounds, they are the lightest outboards in their class. That equates to the weight of a Mercury OptiMax Pro XS 250, and is slightly lighter than an Evinrude E-Tec 250 HO. It’s a whopping 34 pounds lighter than Yamaha’s own 250 VMax HPDI two-stroke.

Check out the URL below.

URL: http://www.yamaha-motor.com/outboard/vmax_micro/testdrive/

Name:	GoneFishin -	Reply
Subject:	How To View The URL Video
Date:	5/30/2010 11:58:31 AM

After you open the URL, scroll down and on the left you will see Play New Reveal Video. Open it and watch.

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