100 hp KZ650

Low 13's maybe. On a good day with a good rider.

kxhonda wrote:

Hmm, kinda seems like the angle leading into the chambers would really screw with the squish area. Almost seems like that chamber wouldn't be as efficient as the KZ's perfect hemispherical chamber. Where's LarryC when ya need him?

You have to remember that it's a GPz750 head

The GPz750 pistons have a dome that matches that bevel, and if the engine is assembled at zero deck height, the piston will contact that bevel, or be within a very few thousandths of doing so.

Looks to me like it is a squish area, but instead of shooting the mixture across the top of the piston it sends it through the middle of the chamber, a good thing in my opinion.

I think I am either going to shave the head right up to the edge of the 45* angle of the intake valve seat and re-cut that angle, or shave the block to bring the piston up to zero deck height, depending on the results of some measuring when I test assemble the motor.


My current thinking is to have .030" between the piston top and that bevel, but I might reduce the clearance after taking measurements during the trial assembly, and I still need to figure out how much the motor expands when warmed up.

It gets tough when you run the ragged edge

Almost seems like that chamber wouldn't be as efficient as the KZ's perfect hemispherical chamber

Show me one modern high hp sport bike that uses a hemispherical combustion chamber

There has been a lot of research into combustion chamber effects since the days when the hemi was king, and it's been dethroned

A hemi chamber is actually terrible for making power, and Kawasaki started moving away from it in 1983 with the GPz1100 (and now it looks like the GPz750 also) head. Both the GPz1100 and the GPz750 chambers leave a lot to be desired, but at least they're a step in the right direction.

steell wrote:

What 750 race bikes? As far as I know the Suzuki GSXR 750 killed 750 racing, they were winning every race. Kawasaki doesn't even make a 750 sport bike any more.

What's the displacement on the GP bikes now? I thought it was about 750.

I guess it's 800cc now:

FIRST SHAKEDOWN TEST FOR THE DESMOSEDICI GP7


Factory test-rider Vittoriano Guareschi carries out the first shakedown test of the Ducati Desmosedici GP7, fitted with a new 800cc engine in compliance with 2007 MotoGP regulations.

steell wrote:

Unless you are talking drag racing, and even there a 200 hp non turbo 600 or 750 would have about as much in common with a street bike as Lorcan's new 1500cc Pro drag bike does.

I never said 200HP from 45CID is typical for a street bike, I said (clearly) it was the limit if you want to throw a ton of money at it.

steell wrote:

You have a link for this 220 hp 750?? That's close to Formula One technology (1500cc 600 hp)

They claimed over 200HP from the 750 superbikes Kawi ran a few years back (about 5HP/CID). I didn't personally witness the testing. Yes, it is similar to F1, except that F1 is 2.4L which is 146 CID putting out over 900HP (normally aspirated) which is over 6HP/CID.

How much horse power does a Formula 1 race car have?


Answer

Formula One engines have anywhere between 800-1000 horsepower. It depends on the constructor. They also put out about 17000-19000rpm.

wiki.answers.com/Q/How_much_horse_power_...mula_1_race_car_have

Damn, am I out of date

I only know of one 600 late model water cooled Kawasaki turbo bike thats been dynoed at 200hp. That belongs to Jon Amo and will be running at Bonneville next week or Bub's Bike Week if it isnt done in time. There may be others but thats the only one I know of and its a land speed bike with aerodynamic body work, a long way from a street bike. There is no 750 class so they have to run in the 1000 class, 1000 cc's being the upper limit. They may be enlarged up to that number if possable. His brother Joe runs a 245 mph Zx10 turbo and holds the record and is faster then most turbo Busas. I believe Jon has run 198 but broke trying to back the record up

Is Bub's Bike week the one on the East Coast? If not, do you know the name of the East Coast Land Speed event? I really want to take the 750 Turbo there in it's current tune to see what it will do before we upgrade it over the winter.

201 mph is all I ask, I just "have" to break 200

Water cooling makes things so much easier


Edit:

Found it! ECTA, runs at Maxton North Carolina, 508 miles from here according to Google Maps.

Thats it, Bubs is run at Bonneville 3 weeks after Speed Weeks, a bike only event. Ill be going to Speed Weeks but just for 2 days, the heat makes me sick to my stomach after that. Its the worlds greatest car & bike show and I highly advise putting it on your bucket list. Theres also the World Of Speed and the World Finals that usually get rained or snowed out. I have seen a producion supercharged class GPZ750 turbo that runs there and is pretty fast. Plenty of fast bikes at the ECTA events but Ive never been there. Several 250+ turbo Busas

Guys, this has been really interesting. I still can't imagine 200 hp is possibly out of any 600 but at any rate it would be NOTHING like the original KZ650 motor, which is what I was posting about. Since 800cc MotoGP bikes are putting out 230-240 hp, a 600 putting out 200 hp seems a stretch. It's 25% smaller, so it should put out about 25% less hp. I would guess 180 or 185 max. And could it live turning 20,000 rpm under racing conditions? I think it would act like a grenade! Could NOS and a turbo make this sort of HP? Certainly but, again, it's not a bike I would care to road race.

Anyway, this thread got mucked up by Harley trash! C'mon, we're talking real Kawis here. Bikes that can make serious hp!

Well, we corrected a mistake in your original post (about the GPz750 head being a bolt on mod for a 650), and except for one brief excursion into Fantasy Land by a Harley owner, we've stayed more on topic than we usually do

And we haven't even talked about increasing the displacement to 880cc yet

If you wan to see what's possible out of a GPz750 motor, check out Lorcan's 250 rear wheel hp GPz750 Turbo at www.750turbo.com , I think his best run was 211 mph.

The regular GPz750 motor is basically a 650 with a bigger bore, the GPz750 Turbo motor is a lot different due to the higher hp levels.


And a real thrill ride when the boost gauge hits the last mark :woohoo:

Hey Hog fish I'll run ya with my H1 500, it's near stock, might be close but you will be reading my plate at the end,and I still have some cash in my pocket "harlies been there done them" 75H1 500 +.020 slight port jetted carbs stingers