GPZ750/810 racer running....
- CoreyClough
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Re: GPZ750/810 racer running....
17 Mar 2011 08:59
turboguzzi wrote:
I hear you on the development. I progressed my bike almost every race weekend last year, and that was 5 rounds changing carbs, jetting, and big bore. 4 dyno runs as well. You have done a lot to that machine, so leaving things as they are, and concentrating on actual racing, is another thing.
Making a breathable airbox protected from heat will still let the engine breathe.
Are you running an oil temp gauge on that beast? If so, what temps are you getting?
yep, thats one solution, Yoshi used to do that, Schwantz's early 750 GSX's and GSXR's had that kind of carb heat shielding.
My plan is to go beyond that and build an actual airbox so that carbs not only suck non-heated air but also air that is still and non-turbulent.
Get the airbox and runner volume right and you can even get a boost from that too. Open carbs are very old school today....motogp and WSBK run airboxes.
I am just at the beginning of the development process for my racer, have plenty of plans and areas for improvement, hei! havent even ported the head yet
just taking some time off being in the garage every night. will pick up development again in the two month break i have mid season.
I hear you on the development. I progressed my bike almost every race weekend last year, and that was 5 rounds changing carbs, jetting, and big bore. 4 dyno runs as well. You have done a lot to that machine, so leaving things as they are, and concentrating on actual racing, is another thing.
Making a breathable airbox protected from heat will still let the engine breathe.
Are you running an oil temp gauge on that beast? If so, what temps are you getting?
'85 GPz550(ZX550-A2)
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- turboguzzi
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Re: GPZ750/810 racer running....
17 Mar 2011 09:44
nope, not measuring temp, not worried about it either.
if i'll start hearing the motor pinging I'll know it's getting too hot
its definitely not.
build a good working squish area that gives quick burning = less time to heat up the combustion chamber = motor runs cooler
I'm down to only 28 degs full advance right now and the torque peak is still a very healthy 58 lb/ft, as good as a current GSXR750 with four valves and water cooling (just at lower revs, dang!) Stock GPZ750 was 41 lb/ft just to give you an idea, so you can get good torque with late timing too if you have the right turbulence inducing squish in there
TG
if i'll start hearing the motor pinging I'll know it's getting too hot
its definitely not.build a good working squish area that gives quick burning = less time to heat up the combustion chamber = motor runs cooler
I'm down to only 28 degs full advance right now and the torque peak is still a very healthy 58 lb/ft, as good as a current GSXR750 with four valves and water cooling (just at lower revs, dang!) Stock GPZ750 was 41 lb/ft just to give you an idea, so you can get good torque with late timing too if you have the right turbulence inducing squish in there
TG
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- larrycavan
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Re: GPZ750/810 racer running....
19 Mar 2011 14:59
how much piston to head squish clearance are u running? i ran my 1327cc kz motor at .036" and had no problems.
turboguzzi wrote: nope, not measuring temp, not worried about it either.
if i'll start hearing the motor pinging I'll know it's getting too hot
build a good working squish area that gives quick burning = less time to heat up the combustion chamber = motor runs cooler
I'm down to only 28 degs full advance right now and the torque peak is still a very healthy 58 lb/ft, as good as a current GSXR750 with four valves and water cooling (just at lower revs, dang!) Stock GPZ750 was 41 lb/ft just to give you an idea, so you can get good torque with late timing too if you have the right turbulence inducing squish in there
TG
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
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01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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Re: GPZ750/810 racer running....
21 Mar 2011 15:48larrycavan wrote: On an air cooled bike, those heat barriers are IMO, not effective to any great extent. They could even be detrimental.
They're going to block air between the cylinders and trap more heat in motor anyway. That trapped heat will transfer to the intake ports...etc.
A correctly sized airbox would be more effective to feed the engine cooler air.
If a shielding device were to be attempted, it might best be designed to shield the float bowls front and bottom. The idea being to allow air through the block between the cylinders and guide it underneath the carburetors.... JMO
An air box that completely enclosed the carburetors would be worth the attempt...again JMO.
Larry C
this pic shows the under the float bowl deal.
leon
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1976 kz 900 x 3
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1976 kz 900 x 3
i make what i can,and save the rest!
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