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Old 09 November 2010, 10:48   #11
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Hold out for the F115, the F100 I think was never fuel injected or ECU controlled just carbs. The F115 should be more economi with a modest hp gain for not that much extra weight. It's only a bragain if you were shopping for it to start with.
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Old 09 November 2010, 10:53   #12
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Weight wise, the yammie 100 is 170, the etec 115 is 170, the opti's are 170, so there isnt much difference and all around the 188 i have on the back now.

Power wise, isnt a 100hp always a 100hp whether its 2 stroke or 4 stroke? Surely its just the torque that differs?

If i were buying new that would be a completely different argument, and my opinions on type would differ and i think id probably join the etec club.

Out of interest, anyone know why does a 150 verado costs nearly 4k more than a 150 Opti?
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Old 09 November 2010, 11:02   #13
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And the fuel economy of a 4-stroke only significantly comes into play when you spend a lot of time at low revs...... Bottom line is if you want 100 HP, you need to burn a certain amount of fuel, coz the laws of nature & themal efficienncy kick in.


Ed,
You don't have Clamshells if they clock in at 114KG each! (Clamshell is the "street" name for the old Merc / Mariner lumps with a wraparound cowl). The early ones had their problems, (as I have since demonstrated! ) but they were remarkably light for the horsepower.
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Old 09 November 2010, 11:16   #14
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Originally Posted by ed_dash View Post
Weight wise, the yammie 100 is 170, the etec 115 is 170, the opti's are 170, so there isnt much difference and all around the 188 i have on the back now.

Power wise, isnt a 100hp always a 100hp whether its 2 stroke or 4 stroke? Surely its just the torque that differs?
Now, you're really spoiling the fun.

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Out of interest, anyone know why does a 150 verado costs nearly 4k more than a 150 Opti?
I think it's on the theory of 'if you can afford to fuel it, you can afford 4k extra to buy it'
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Old 09 November 2010, 11:40   #15
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not that i like disagreeing with the vast knowledge on here, but mine have a weight of 94kg stamped on the id plates along with the serial numbers, even if thats before the oil tank is filled, that is only a few kg.

Here is a pic i found on here:

http://www.boatsplus.com.au/mariner-...e/prod_54.html

i dont have the bigfoot gearbox thats on the spec sheet so the weight wou;d be a bit less.
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Old 09 November 2010, 11:42   #16
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Power wise, isnt a 100hp always a 100hp whether its 2 stroke or 4 stroke? Surely its just the torque that differs?
And torque is everything
Torque gets you on the plane
Torque pulls up the skier
Torque is the kick in the pants when you bury the throttle(s)
Torque gets you up the face of that fkin big wave
Torque is king
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Old 10 November 2010, 04:07   #17
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not that i like disagreeing with the vast knowledge on here, but mine have a weight of 94kg stamped on the id plates
And that is why rules of thumb have their place, but you just can't beat good old reality!
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Old 10 November 2010, 09:34   #18
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You know very well that on the whole a 2/ rated to 100 will produce more power that a 4/ rated to the same power output, not only in terms of torque but horsepower too.

Obviously this is a generalisation (especially in the case of horsepower), but the basic concept of the two stroke motor results in greater power over a 4/ of the same ccs. The E-tec 130 for instance, although undoubtably one of the weaker engines in the e-tec stable, will provide significantly greater power than the weak Suzuki DF140 (128hp what). However there is no way it could keep up with the big block DF150's torque. In a marine application, torque (as played upon by Evinrude and Pikey Dave) is the biggest player.

I am a firm advocate for 2/ DI, but even I know that in many applications 4 can be better than 2. The reason I tried to make a point here was because the OP was worried about the performance aspect compared to his current engines.

To answer the OP's question, I agree with 9D280, just replace the twins with modern 2/ and save the hassle of all the work involved in changing to a single

I see no point in trying to explain my point further, since I know you believe in the same principles, seeing as your two boats are both 2/.
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Old 10 November 2010, 09:42   #19
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You know very well that on the whole a 2/ rated to 100 will produce more power that a 4/ rated to the same power output
No, it won't.

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The E-tec 130 for instance, although undoubtably one of the weaker engines in the e-tec stable, will provide significantly greater power than the weak Suzuki DF140 (128hp what).
No, it won't.
(unless the 128hp claims are accurate and you consider 2hp to be significant)

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I know you believe in the same principles
No, I don't

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your two boats are both 2/.
No, they're not.
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Old 10 November 2010, 10:39   #20
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Normally I would argue back, but unfortunately I'm too busy. Controlled Assessment and all that

Onwards Blackpig!!
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