davidni Posted August 15, 2006 Author Report Share Posted August 15, 2006 Sorry to bring up the topic again here but could anyone tell me what bhp a 2004 sherco 2.9 would be. I'm kinda half dissapointed here cause I was thinking the power output would have been higher seeing a cr85r scrambler is 25 bhp in only 85 cc! Quote Link to comment Share on other sites More sharing options...
neonsurge Posted August 15, 2006 Report Share Posted August 15, 2006 Not sure why you're so obsessed with BHP, dude. It's really pretty irrelevant as far as trials bikes go (and pretty meaningless generally since there are so many variables and "IF"s and "BUT"s to consider). What's important in trials is torque and I guarantee you that a 250cc trials bike will out-torque a 250cc 'crosser any day of the week. Put it this way: I'm heavy (17st) and my 250cc Beta scares me all the time. I used to own a 270 and in the wrong hands (ie, mine) that thing was potentially bloody lethal. A Sherco 290 has far, far more power and TORQUE than you'll be able to use effectively unless you're Albert Cabestany, I guarantee it. Forget all these silly BHP comparisons and go ride a 270 Beta, 280 Gasser or 290 Sherco. THEN come back and say they're not powerful enough! Unless what you're really looking for is a field/play bike in which case you're probably better off with a 'crosser anyway. "The Fast and the Furious" has a lot to answer for..... Quote Link to comment Share on other sites More sharing options...
the addict Posted August 16, 2006 Report Share Posted August 16, 2006 David, as neon says bhp has just about nothing to do with trials bikes, what you need is torque, the 85cc crosser has more bhp because it revs high at the expense of torque. If you look at the crosser torque spec bet its got next to bugger all. There is a calculation of torque/bhp and rpm but cant remember it now, you cant have big bhp,big rpm and big torque without a massive engine. If you want something to bomb round the fields get a crosser not a trials bike. Its the same for Ducati's and Harleys, bugger all bhp and revs but bucket loads of torque, Jap bikes lots of rpm, lots of bhp but not as much torque, cant have it always Quote Link to comment Share on other sites More sharing options...
atomant Posted August 16, 2006 Report Share Posted August 16, 2006 Horsepower and Torque are mesurements of an engines performance and are directly related Hp is more relevant when the engine is rotating at high speed whilst torque is more relevant whilst the engine is at slow speeds If you know the HP then you can work out the torque at any given rpm using this calculation. Torque = 5,252 x hp ------------ Rpm And if you know the torque then for the HP its : Hp = rpm x torque --------------- 5,252 p.s. The SI unit for torque is newton metres Quote Link to comment Share on other sites More sharing options...
bikespace Posted August 16, 2006 Report Share Posted August 16, 2006 Hp = rpm x torque --------------- 5,252 p.s. The SI unit for torque is newton metres But doesn't your equation work it out in lb-ft? Can we cancel the two 5252's out then and say that at 5252 rpm horse power equals torque? Don't seem right? Educate me Quote Link to comment Share on other sites More sharing options...
atomant Posted August 16, 2006 Report Share Posted August 16, 2006 Hp = rpm x torque --------------- 5,252 p.s. The SI unit for torque is newton metres But doesn't your equation work it out in lb-ft? Can we cancel the two 5252's out then and say that at 5252 rpm horse power equals torque? Don't seem right? Educate me yes, the toque in this equation is calculated as ft-lb The 5252 is a constant so yes, if you want to know HP at 5252 rpm then cancel them out .. But you knew that Quote Link to comment Share on other sites More sharing options...
bikespace Posted August 16, 2006 Report Share Posted August 16, 2006 yes, the toque in this equation is calculated as ft-lbThe 5252 is a constant so yes, if you want to know HP at 5252 rpm then cancel them out So why aren't torque graph's always a straight line? Quote Link to comment Share on other sites More sharing options...
atomant Posted August 16, 2006 Report Share Posted August 16, 2006 Your talking about torque curve graphs like you get from a dynamometer? have a look at here if you really really want to know. Quote Link to comment Share on other sites More sharing options...
the artist formerly known as ish Posted August 16, 2006 Report Share Posted August 16, 2006 All this torque about HP and equations, the Silsden formula, is! will it get up that bloody hill afore pub opens or not Quote Link to comment Share on other sites More sharing options...
atomant Posted August 17, 2006 Report Share Posted August 17, 2006 All this torque about HP and equations, the Silsden formula, is! will it get up that bloody hill afore pub opens or not Quote Link to comment Share on other sites More sharing options...
davidni Posted May 14, 2007 Author Report Share Posted May 14, 2007 Ok its been a long time since i've been on here and I can now see that no-one obviously cares about the BHP of trials bikes for good reasoning. When I was getting a new bike back then I basically wanted a rating to compare the power of various bikes and BHP was the measurement I was familiar with. The reason I wanted this rating was because I thought what I needed was a much more powerful bike. Anyhow since then I bought a Sherco 290 rode it for a couple of months then sold it because I then figured it wasnt actually power that I needed. I then bought a 2000 beta techno 200 which has served me well ever since and has stacks of power for the type of riding I am used to. The beta seems much more smooth and far lighter than the old yamaha yet isnt overpowered like the sherco was for me. Quote Link to comment Share on other sites More sharing options...
weet Posted May 20, 2007 Report Share Posted May 20, 2007 i hope this helps, i know nothing about trials bikes.... but i do know tractors. my 1951 farmall (H) is only 18 horse-power, but can pull a two bottom 16'' plow. in hard ground. i love flying low n' slow !! weet Quote Link to comment Share on other sites More sharing options...
atomant Posted May 20, 2007 Report Share Posted May 20, 2007 ...... and I can pretty much guarantee a Rev 3 will progress your riding so much! What!! you mean like this? Quote Link to comment Share on other sites More sharing options...
betatrials99 Posted May 25, 2007 Report Share Posted May 25, 2007 20??? I would have said a 250 would be about 11 or 12?? Dyno run needed! Quote Link to comment Share on other sites More sharing options...
scottt Posted June 6, 2007 Report Share Posted June 6, 2007 20??? I would have said a 250 would be about 11 or 12?? Dyno run needed! 125 Montesa 12hp, going off that i would say a new 250 would be around 20hp with 290-300's 25hp Quote Link to comment Share on other sites More sharing options...
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