JBS 700 Kit on welded 80mm Crank

jon andersson · Mar 17, 2015

I just wanted the discussion to start, always something to learn

What I do know is that it's not about peak HP, it's all about the curve. A 2 stroke 125cc can have relatively high peak HP but the power delivery is another story.
And as power is torque x rpm the result is that the more torque you have at a certain rpm the more hp you will have at that rpm too. That 2 stroke 125 compensates lack of torque with high rpm's to achieve that peak hp it lives on.
So even if the torque is a static measurement it's the rpm that makes it useful.

berglsmerg said:
Ahh nuts to hp anyway, tq makes it go.

"tq makes hp which makes it go."

Dr_C · Mar 17, 2015

Here is also some useful information on the topic: Power and Torque: Understanding the Relationship Between the Two, by EPI Inc.

The maths are not difficult. Whats interesting though, is that the capability of an engine to uphold a speed at a certain load (definition of power), doesn't say so much about it's performance in actual racing. Being able to uphold a speed with an increasing load is interesting for static engines in generators/hybrids and such. What does count is how the engine picks up revs during load! Then mechanical inertia, valve timing, inlet design, ignition advance, gearing ratio and so on, makes all the difference to the whole performance. Yes, a smooth and sensitive delivery is very important! But hey, at the end of the day, who crosses the finish line first is what REALLY matters! :happy:

berglsmerg · Mar 18, 2015

So tq and hp make work, the more work you get out of it the faster you can be.

bushmechanic · Mar 19, 2015

spanner · Mar 19, 2015

Wot have you done Bushie?

bushmechanic · Mar 20, 2015

me? just watching mostly

its my brothers hillclimber. really is an awesome machine, hes done respectable laps around the MX track with it including 40ft jumps

i was thinking about the tourque vs HP stuff ... lets have both ... just take 1300cc with a 13500 rev limit and make some dust

spanner · Mar 21, 2015

Can we get a 1300 single to rev that high

berglsmerg · Mar 21, 2015

140mm piston on a 80mm crank made out of negative mass depleted unobtainium?

bushmechanic · Mar 21, 2015

be fun to watch

600cc with a desmo head could do it .. maybe not the most practical use of money

still firecrackers are gone in an instant .. "oooohhh ahhhh oohhhh"

250cc singles

https://www.youtube.com/watch?v=vcyT18qk8ls

spanner · Mar 21, 2015

Looks like the valve springs are dodgy....

JBS 700 Kit on welded 80mm Crank

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