S&S New Product
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Road Master
Joined: Feb 2008
Posts: 903
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From: California
S&S New Product
For those of you who love speed, S&S has come out with a new product. It's not for me as my bike goes as fast as I need but for some this product may be of interest. By the way, I have nothing to do with S&S.
http://www.sscycle.com/feature/featureview.php?s_id=58
http://www.sscycle.com/feature/featureview.php?s_id=58
Cruiser
Joined: Oct 2009
Posts: 109
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From looking at the dyno chart they show, I see no value added unless you like to drive around at >5000 rpm.
Below that, it is much the same as the stock throttle body, if fact slightly less TQ through most of the RPM range.
They only gain 1 ft/lb of torque and 5 hp in the upper ranges.
Am I missing something here?
Below that, it is much the same as the stock throttle body, if fact slightly less TQ through most of the RPM range.
They only gain 1 ft/lb of torque and 5 hp in the upper ranges.
Am I missing something here?
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
the reduced low rpm performance is typical of "too large" a TB- the velocity of the incoming air is lower than other wise.
possibly resulting is less cylinder fill, less turbulent mixture in the cylinder.
but gains from 4800- 6500 RPMs.
for any performance gee-gaw the question must be asked "in what rpm range do I do most of my riding"
unfortunately S&S does not give other details of the motor build dyno'd
the "too big" was often a problem on carb vehicles as well whether a harley or a car, in this case the air velocity was too low to draw fuel from the float bowl- so oversize jets were used to supply more fuel- which would not atomize and would burn unevenly. Once the rpms were up and the air moving the jets would now be too ;large and the mixture over-rich.
(the beauty of the constant velocity carb like the SU or Keihin CV is in the design)
possibly resulting is less cylinder fill, less turbulent mixture in the cylinder.
but gains from 4800- 6500 RPMs.
for any performance gee-gaw the question must be asked "in what rpm range do I do most of my riding"
unfortunately S&S does not give other details of the motor build dyno'd
the "too big" was often a problem on carb vehicles as well whether a harley or a car, in this case the air velocity was too low to draw fuel from the float bowl- so oversize jets were used to supply more fuel- which would not atomize and would burn unevenly. Once the rpms were up and the air moving the jets would now be too ;large and the mixture over-rich.
(the beauty of the constant velocity carb like the SU or Keihin CV is in the design)
Last edited by mkguitar; Jun 15, 2012 at 01:28 PM.
I have a SE 58mm TB that I'm not using right now because I was told by the builder I would loose some low end torque, funny thing is I paid less for my TB than S&S wants for exchange, go figure.
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the*bear
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Sep 7, 2008 10:17 PM
