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Horse Power (HP) in new promotional releases

6.3K views 61 replies 20 participants last post by  IMARIDER  
#1 ·
I thought - and please educate me - there were too many factors in the mechanics and engineering of a motorcycle engine to determine an accurate rating of horse power. The press releases I’ve seen recently for the new Indian PowerPlus 108 v-twin read like this: “This liquid-cooled beast raises the bar for American bikes, offering 122 horsepower and 128 lb-ft of torque. It is the centerpiece of their new Challenger motorcycle.”
I was told torque was really more accurate in rating a mc engine. Why are they bringing up hp now?


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#55 ·
Long ago a local engine builder told me that HP was Ali rabbit punching you and TQ was Frazier following through with a hit to the kidney.

TQ is determined by mechanical means. HP is a calculation. At least thats what I was always told.
 
#31 ·
That is a stock bike @ New York Mike [emoji57] The bike doing the wheelie is from George Bryce Star Racing bagger 9 second bike in the quarter mile. Yeah there's a reason why they tear down dragsters after every run


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#53 · (Edited)
They posted HP numbers on the V-Rod . Indian doesn't post HP numbers on the TS111 and the TS116
I think the reason why Harley and Indian don't publish HP mumbers on the big pushrod engines is because they are all about the torque which both companies freely publish.


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#57 ·
Torque is what you can measure on a roller test bench with the engine installed in a vehicle or on engine break test bench without installed in a vehicle.
Power is the result of torque multiplied by rpm.
So there is always a corrolation between torque und power
 
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#59 ·
To quote Caroll Shelby: "Horsepower sells cars, torque wins races". I am excited about this platform as the base torque is on spot with a 111 with cams. The potential is going to be awesome.
 
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#60 ·
Horse power has been talked about in promotional releases since forever by motorcycle companies. Just not Harley. I wonder why...
 
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#61 ·
The Harley motors suck at horsepower and just talk about torque. Couple of reasons, they don't have any numbers for horsepower that anyone would be proud of so they have numbers that you can't directly compare to most competitors. Second it sounds big when compared to other motors, if you do see torque numbers for a crotch rocket you can be happy with your bike that it makes more torque.

Harley has low horsepower bikes because they want to focus on the experience. The liquid cooled higher revving motors that KTM and Ducati make don't sound like a Harley. If you want the sound, you need to get the power as low as possible so you can better hear the individual cylinders firing.

The Caroll Shelby quote is referring to area under the curve. If you have a vehicle with a very peaked horsepower rating versus a vehicle with good torque (and thus hp) through the RPM range, the broader power band will win a race. Another way to look at it, if you have a motor making 100ft-lbs at 1500 RPM and I have a motor making the same 100ft-lbs at 5000 RPM, I will win because I can get more work done.

Remember, horsepower is a calculated number based on torque and RPM.

HP = torque X RPM
5252​
This is the reason that when looking at a dyno chart where the HP and the torque are on the same graph and the standard English units are used, the torque and HP will always cross over at the 5252 mark.
 
#62 ·
The Pushrod engines from Indian are following the same formula that you’re citing Harley for. The 107 has more HP than the TS111 as well as the 114. Indian also doesn’t publish HP numbers on its pushrod engines either hmmm I wonder why ? I’d like to see the dyno numbers on the factory TS 116 .


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