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650 single VS 650 twin.... (Read 599 times)

KwakNut

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Re: 650 single VS 650 twin....
Reply #30 - 05/30/08 at 13:12:16

furious70 wrote on 05/30/08 at 13:00:49:

The point I was trying to make was that you measure tq and you calculate horsepower. The reverse is not true. So while you can manipulate the formula to solve for TQ if you know HP and rpm, it's a moot point because you had to know the tq value to get HP in the first place. That manipulation of the formula is only useful for determining what tq an engine would need to produce at a given rpm for a theorical HP goal in mind or something.

Ok, with you on that!

If everyone is thinking alike, then somebody isn't thinking.
--General George S. Patton

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furious70

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Re: 650 single VS 650 twin....
Reply #31 - 05/30/08 at 13:19:46

sorry for the fuzzy language in my first post. I do prefer to be precise about this stuff, as fuzzy language allows concepts to go on misunderstood, and that doesn't help anybody. Sorry if we hijacked a bit, but this technical conversation is key to understanding why a Savage might feel powerful to some of you yet anyone with a Ninja 250 would blow your sidecovers off.

And more power to you if you can 2 up and be comfortable. I can't ride my wife's bike for 20min without being ready to get off it, because of the ergonomics and the engine.

2002 Kawasaki Mean Streak (mine)
1999 Suzuki Savage (hers)

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KwakNut

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Re: 650 single VS 650 twin....
Reply #32 - 05/30/08 at 13:23:37

furious70 wrote on 05/30/08 at 13:00:49:

Quote:

I wrote an Excel spreadsheet a few years ago into which you can enter your power (or torque) curve, gearing details and vehicle weight, and it will work out your tractive force at the wheels and give you 0-60 and quarter times – it is very accurate too against real world tests and manufacturer’s figures. I’ll dig it out and post a link to it on here somehow (it’s quite a big file, something like 300 lines of iterative calculation for each point on the curves).

Very interested in playing around with this!

I'll dig out a copy, might take me a few days to 'undevelop' it - been adding a lot more features and it's a bit of a mess at the moment.

If everyone is thinking alike, then somebody isn't thinking.
--General George S. Patton

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rigidchop Serious Thumper Offline don't feed the drama llama Posts: 1105 ravenswood wv Gender:	Re: 650 single VS 650 twin.... Reply #33 - 05/30/08 at 20:30:37 i think i'll just ride mine, and leave the techy arguing to all of you.
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