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  #11  
Old 11th February 2018
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Originally Posted by Truckedup View Post
... or more importantly have enough torque..?
Why does the torque matter?
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  #12  
Old 12th February 2018
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Why does the torque matter?
On a Superflow dyno, my 650 Triumph LSR bike makes 52 rear wheel HP at 7000 rpm...The maximum torque is 44 ft lbs at 5100 rpm and at 7000 rpm there's still 40 ft lbs...It is torque that moves the bike, HP is just calculation of torque at a given RPM? Well, maybe I'm just thinking too much ,lol.

My rider is going to look at several early 2000's Sportsters for sale locally..I certainly will remember you for crankshafts...
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  #13  
Old 12th February 2018
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Originally Posted by Truckedup View Post
It is torque that moves the bike, HP is just calculation of torque at a given RPM?
Yes, but rpm is readily convertible to torque. If you, for example, gear something shorter by one-half, you cut the rpm in half, but you also double the torque. Conversely, gear it taller by a factor of two, you double the rpm and halve the torque.

So at the end of the day, torque and rpm are the same thing, since one is readily converted to the other. They're both equally valuable.

That's why horsepower is the operative number. It's literally the torque times the rpm. It's the combination of how much torque and how much rpm you can make at the same time. It doesn't specify the makeup of the two, but that's not so important. Whatever the makeup is, it's readily converted to the combination you need by your gearing.

And in fact, that's exactly what the transmission does. It lets you change that makeup on the fly. In first gear, you've got tons of rear wheel torque. You can probably do a wheelie, you've got so much rear wheel torque. But you don't have much rear wheel rpm. Every time you upshift, you give up some rear wheel torque and trade it for some rear wheel rpm. By the time you get to top gear, you're probably not going to be doing any roll-on throttle wheelies. But you've got lots of rear wheel rpm. The horsepower stays the same whether you're in first gear or fifth gear. But at the rear wheel, it's makeup of torque and rpm is different.
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  #14  
Old 12th February 2018
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Ok ,thanks....It always comes down to money, figuring I can get a donar Sportster for $2000, then another $1500 for speed rated tires, the wheels they fit and assorted small stuff like steering damper, chain conversion and sprockets etc.I have a lathe and do make axles,spacers and various small parts...We have about $6000 to spend on the engine...I do all the assembly on my Triumphs but the Harley crank works should be done by you for example...
I'm thinking the 6 grand can build a decent reliable competitive 1000 cc engine?
In comparison, a competitive vintage Triumph engine costs me about four grand for parts and machine work, I do the assembly...$350 for pistons,450 for rods, 500 into the crankshaft for Tufftriding, machine work and balance,the head cost me about $1000 for parts and port modifications ( I don't do head work), 450 bucks for ignition and so on.....
I'm looking forward to this project....
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