Motor head question
Unless you have a tuned intake tract (like the VRod) you can get horsepower improvements by lowering the resistance to air-flow on the intake side (works on the exhaust side too). Lots of folks using those A&N low restriction air filters on their motorcycles but you would never want to ride open (no filter). Particulates in the air are abrasive and damage your engine over time.
On the V-Rod the intake tract was designed by Porche Engineering Group -- one of only a few automobile manufactures that know how to create a tuned tract. The tract is sealed tightly and the two throttle bodies have velocity stacks of specific but differing dimensions all designed to time the intake from a high-pressure point at the front forks as the motorcycle moves through the air stream. This times the intake so one pulses pulls in the next and the intake tract becomes slightly pressurized (slightly over ambient). This is good for 6 HP on the Vrod. This can't be measured on a Dynometer because there is no high-pressure zone when the bike is sitting still. Many VRodders believe running "topless" (with the airbox open) provides some additional Horse Power (that REALLY can be measured on the Dyno but is actually a net loss).
On the V-Rod the intake tract was designed by Porche Engineering Group -- one of only a few automobile manufactures that know how to create a tuned tract. The tract is sealed tightly and the two throttle bodies have velocity stacks of specific but differing dimensions all designed to time the intake from a high-pressure point at the front forks as the motorcycle moves through the air stream. This times the intake so one pulses pulls in the next and the intake tract becomes slightly pressurized (slightly over ambient). This is good for 6 HP on the Vrod. This can't be measured on a Dynometer because there is no high-pressure zone when the bike is sitting still. Many VRodders believe running "topless" (with the airbox open) provides some additional Horse Power (that REALLY can be measured on the Dyno but is actually a net loss).
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Club Member
Joined: Jun 2009
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From: NJ
20 k later I'd like to run her again but never have. I since put V&H headers too. One day this summer I'll have her run again.
Ultimate HDF Member
Joined: Mar 2012
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From: Santa Cruz
I'd guess proper headwork will get ya 5-10tq and 10-15hp?? More compression and bigger cams would be some more. But ya start to really get into diminishing returns around there.
Last edited by 0ldhippie; May 12, 2014 at 08:19 PM.
Outstanding HDF Member
Joined: May 2008
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From: Ashland Ohio
The answer is NO, the bike should be exactly how it will be ridden on the street.
Tourer
Joined: Nov 2011
Posts: 466
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From: Montgomery, AL
Correct. A 2 into 1 exhaust would help a little bit as well.
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Club Member
Joined: Jun 2009
Posts: 5,323
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From: NJ
I hear ya. $1500.00 is alot for that.
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