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drjohn71a
Joined: 15 Jul 2004
Posts: 1820
City/Region: Wichita
State or Province: KS
C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: Tom-a-Hawk
Photos: Tom-a-Hawk
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 Posted: Thu Oct 25, 2007 9:41 am Post subject: |
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I am thinking that your manner of use would have a greater effect upon the carbon footprint than the choice of engine. Technology advancement in efficiency renders very efficient designs in all the major players of outboard manufacture.
As Dr. Bob has mentioned elsewhere, you generally are going to burn a certain gallonage of gas per horsepower per speed per boat shape, period. The larger displacement Suzuki 150's might give you very slightly less efficient low load economy, but the Honda 135-150 VTechs might give you slightly less efficiency at high loads. As above and as in many autos, your manner of piloting would have greater carbon footprint impact than buying a different brand name of similar sized (HP) engine.
When I was looking at Mercuries they were quite a bit heavier than either the Suzuki or Honda 150s, and that is a big deal on the aft end of a TomCat.
John |
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tsturm
Joined: 01 Nov 2003
Posts: 1134
City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
Photos: JMR-TOO
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| Posted: Thu Oct 25, 2007 11:42 am Post subject: |
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YAMAHA  I have had Mercury & Honda. Yamaha first, if not available Honda. A cam chain & assorted guides, tensioners etc will wear lots faster & require more maintenance, that is why most have gone to Belts!   |
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Doryman
Joined: 03 Oct 2006
Posts: 3807
City/Region: Anacortes
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Lori Ann
Photos: Lori Ann
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| Posted: Thu Oct 25, 2007 1:15 pm Post subject: |
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| tsturm wrote: | | YAMAHA I have had Mercury & Honda. Yamaha first, if not available Honda. A cam chain & assorted guides, tensioners etc will wear lots faster & require more maintenance, that is why most have gone to Belts! |
Tim, Ah -- another Yamaha owner! We are definitely in the minority, for some reason. I wanted Hondas but the Tom Cat dealer (Master Marine) made me a good deal on Yamahas, plus they don't stock them (could have gotten them, though.) So I decided to try them. Have been quite happy with them.
I have a question about your experience with these engines. I have two 150s and I know you have a 100, but maybe there is some commonality. What I have discovered is that if I run my engines over about 4000 RPM for a sustained period the temperature gauge goes up a couple of notches. On my Yamaha Command Link gauges, under sub-4000 operation, the temperature indicator is lined up with the pointers for oil and battery (I think that is what they are.) Running at faster speeds moves the temp indicator to about half-way between middle and maximum.
Do you see the same thing or does your motor remain at midpoint regardless of the RPM? Would be interested what the Honda and Suzuiki owners experiences are also.
Thanks,
Warren
_________________
Doryman
M/V Lori Ann
TomCat 255, Hull #55, 150 Yamahas
Anacortes, WA
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tsturm
Joined: 01 Nov 2003
Posts: 1134
City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
Photos: JMR-TOO
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| Posted: Thu Oct 25, 2007 2:14 pm Post subject: |
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| Lori Ann wrote: | | tsturm wrote: | | YAMAHA I have had Mercury & Honda. Yamaha first, if not available Honda. A cam chain & assorted guides, tensioners etc will wear lots faster & require more maintenance, that is why most have gone to Belts! |
Tim, Ah -- another Yamaha owner! We are definitely in the minority, for some reason. I wanted Hondas but the Tom Cat dealer (Master Marine) made me a good deal on Yamahas, plus they don't stock them (could have gotten them, though.) So I decided to try them. Have been quite happy with them.
I have a question about your experience with these engines. I have two 150s and I know you have a 100, but maybe there is some commonality. What I have discovered is that if I run my engines over about 4000 RPM for a sustained period the temperature gauge goes up a couple of notches. On my Yamaha Command Link gauges, under sub-4000 operation, the temperature indicator is lined up with the pointers for oil and battery (I think that is what they are.) Running at faster speeds moves the temp indicator to about half-way between middle and maximum.
Do you see the same thing or does your motor remain at midpoint regardless of the RPM? Would be interested what the Honda and Suzuiki owners experiences are also.
Thanks,
Warren |
Heat definatly increases with load / RPM, but in my case 27 to 50deg water I hardly notice. One thing I did notice switching from Honda to Yamaha is the Yamaha is one notch better / faster warming up during the winter (less carb icing) 
This may have been addressed with FI in the newer yrs. Also the Yamaha F 100 (99) is far more corrision resistant than the 98, 90hp Honda. Maybe they fixed that too!! |
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