500cc 2stroke GP bike enigines, what are their power outputs?

[Robin Plummer]

Can someone here tell me what the approx horsepower outputs are on the current 500cc V2, V3 and V4 Grand Prix bike engines are?

[Leo]

The output of a Honda 500cc V4 2stroke is about 200 horsepower. The 1998 version was slightly more powerful (over 200hp), because it ran on special fuel. This year only unleaded fuel can be used.

[Robin Plummer]

I heard a rumour that the 99 Yamaha was pusing out 240bhp which to me seem's unbeliveable!.

[Sparky]

Welcome to the Forum Leo!!

I'm afraid I'm not too familiar with 2-stroke engines, let alone the Grand Prix stuff, but I would imagine that power development would keep pace with the reduction in fuel quality. Improvements in the quality of materials, engine design and induction / exhaust systems should mean that the 240bhp that Robin mentions would be quite possible, even on current low-octane fuel.

[Leo]

Thanks, Sparky!

As in F1, manufactures keep the output of their engines as secret as possible. But the 200+ Hp for the 1998 season, I'm quite sure about. I think it was the first year the 200hp barrier was broken. I'm also quite sure the 1999 engines were less powerfull, because all riders and engineers said so!
240hp is too much, I think.

[THR]

240? no way

so what is a usual HP for a 1200cc bike? that is tuned?
A ford Hart 1600cc BDA is only about 240-280 BHP @10200 rpm

[Robin Plummer]

THR, a 1600cc BDA is a 4cyl, 4 stroke twin cam 16v engine. A 500cc V4 2-stroke with 4 cams has effectively twice the potenial power output of a 500cc 4-stroke so yes 240bhp is within reach to an ultra efficient 500cc 2stroke engine reving to about 12,250rpm. Honda's 1999 750cc V4 4cam 4-stroke superbike engine in the RC-45 produces 180bhp at 15,000rpm.

[THR]

um,
180 is a bit less than 280?
The BDA is a comparison,
bike engines are approaching them but not quite there yet.
U think that a 500cc is as powerful?
not a chance in my view.
even if it is as powerful, the application depends i believe.

[Robin Plummer]

180bhp is a lot less than 280bhp but then 750cc is a lot less than 1600cc!!

Therorically if the engine was bored out to 1500cc or more likly two 750cc engines joined by a common cranshaft then the potential power output is 360bhp! from 1.5 litres. A 1.5 litre V4 2 stroke based on GP bike technolgy has the potential to produce 600bhp!! so it would blow a 1600BDA into the weeds.

[THR]

Power is in now way proportional to the size of the engine you know!
a 3litre v10 say about 700bhp, a 750 say 180.
not proportional!
more losses with bigger engines.
uncomparable really, more power is not always faster

[Sparky]

Actually THR, the power to engine capacity ratios for both engines you mention are IDENTICAL!!

You said: "3litre v10 say about 700bhp, a 750 say 180"


A bit of maths...

700 divided by 3000 = 0.24bhp / cc

180 divided by 750 = 0.24bhp / cc

Perfectly proportioned!!

I still think 240bhp from a 500 cc 2-stroke is possible

[THR]

700/3000=0.233
180/750=0.240

Quite a big difference really

Anyway, a hyabusa engine is for sale. rebored and Cosworth pistons, properly done by a engine dude.

puts out 240BHP no less! and wow this is a 1100ish cc engine (rebored bigger i think)

so no chance of a 750 being 240BHP

[Leo]

And again, this is how it is:

GP500 4cyl.: around 200hp. (If the Yamaha really had 240hp they'd won every GP last year!!)
Superbikes (both 1000cc V2, and 750cc 4 cyl.): slightly less than GP500, but not much. I guess 180-190hp. Just take a look at the laptimes from tracks used by both series.
Hayabusa; a street legal version has 180hp. You can't tune it to 240hp without serious reliability problems.

F1 3.0 V10: over 800hp, with the most powerfull engines for next year around 840hp.

[Robin Plummer]

It's hard to tell the horsepower differneces between GP bikes and Superbikes as SB's weight at least 32kg more. SB teams tend to advertised their power more openly than GP teams. For example Ducatti say the their 99' 1000V2 4 stroke puts out 163bhp @ 11,500rpm. Where as a Suzuki,Honda, Yamaha 500c V4 strokes are advertised as "more than 180bhp". These same teams in 1989 said "more than 160bhp" 10 years ago, so I would expect the development to have surpassed this even with unleaded fuel.

As for the Suzuki Heyabusa engine THR it's a 1300cc in normal trim kicking out 173-180bhp depending on what country you live in! @240bhp it would probably self distruct quite quickly!!.

As for the Yamaha 500cc V4 2stroke being 240bhp that quote was from Max Biggai in Autosport mag this year.

[THR]

240 is possible from a hyabusa!!!!!!

if you can get 240 (so u say) from a 500cc
what makes you think you cant get 240 from a 1300?

superbikes arent that much quicker even cos of the power, because of that extra weight they carry throu the corners.
weight is everything!

Superbikes arent quite as devolped as GP bikes. but, the haybusa uses pretty much all the technololgy availible. so it can easily produce 240bhp. a bit of beefing up the drive train may need to be done, but that is to be expected as the engine was only designed for 180.