TOPIC:

turboguzzi wrote:

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?

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

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

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 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

mark1122 wrote: how much piston to head squish clearance are u running? i ran my 1327cc kz motor at .036" and had no problems.

.030"

larrycavan 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

with you on this larry, an airbox rather than open barrier is my plan indeed.

larrycavan 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

Dang that is a sweet looking bike. Nice belly pan too.

Dutch, you looking at this???

haha come on sander,make us some belly pans!

i have been searching for a belly pan.
it could be the only un-needed piece that a street bike could have that i want.
i guess it is the wannabe racer boy in me ,haha.

leon

anyone ever seen a link to pans???

great pics guzzi!!!!

wannabe racer boy....here we go again banshee.

trianglelaguna wrote: anyone ever seen a link to pans???

great pics guzzi!!!!

wannabe racer boy....here we go again banshee.

it's me and you tri!

till the bed collapses,or the wheels go square .

leon

Oh I really want a belly pan for when I do my turbo build. I think my 650 doesn't need one.