overheating advise please

[scooterboy]

I guess our problem at Shanny was we over heated the motor. It was the last race for that 650 motor but really dont want to do the same to the 750 going into it. I am putting a larger oil cooler on and I know the 750 kits have larger fins but my question to you guys is do any of you run any sort of ducting to direct airflow onto the motor or has anyone had overheating problems and found a good solution.
any input would be greatly apreciated
cheers
Vic

[Percy W]

Move slower.....(please).

[chairman]

WHAT ENGINE TYPE ARE YOU RUNNING

[scooterboy]

it was an xs650 will be putting in a 750 kitted XS

[Ray Roberts #115]

Hi Vic, My CB500 (big lump of a motor) would run very hot and I found Amsoil Synthetic oil made it run a lot cooler, every little bit helps.
Ray.

[scooterboy]

Thanks Ray, I am running Bradd Penn straight 40. Apparantly its the best there is according to Mike my engine builder, but thanks for the input, are you going to grand bend, if so i will bring that starter with me
cheers
ps hows your build coming along?

[turtlehub]

several things may cause overheating

carb jetting
timing

or perhaps you need a big honking earls oil cooler like those used on the old air cooled superbikes - and they look real cool... what oil cooler r u going to run?

[Michael Vinten]

My engine runs very hot but it seems to be the nature of the beast. Oil pans do not help as they remove all cooling air flow past the sump. I have ducts in the fairing but no directional ducts to the engine. The oil pump is small and consequently flow is not very large so large coolers make little difference. I have thought about wrapping the pipes to reduce heat in front of the engine. Don't listen to Miles...go faster to increase the cooling air!

[tintop]

As Mike says, these engines run hot, and the more HP you pull out of them the hotter they will get. Adding an oil cooler will definitely help. Just make sure its either in the direct air stream, or well ducted. Also as mentioned carb jetting (too lean), or timing can cause excessive heat.

[MGill]

Well, you could put one cylinder on each side of the crank case....

[gary holden]

"These engines run hot." But does anyone know how hot,like by measuring oil temp or cylinder head temp.I'd be interested to see if the aerodynamic penalty of an unfaired bike is offset by the greater airflow around the engine.Except for Mosport,I don't think that improved aerodynamics makes much difference at the tracks we run.

[tintop]

"These engines run hot." But does anyone know how hot,like by measuring oil temp or cylinder head temp.I'd be interested to see if the aerodynamic penalty of an unfaired bike is offset by the greater airflow around the engine.Except for Mosport,I don't think that improved aerodynamics makes much difference at the tracks we run.

I've thought about installing an oil temp gauge, just never got around to it. I did notice that after I put more venting below the screen the engine seemed cooler. However, it was definitely running hotter at the beginning of the last event. I put this down to a tight / fresh engine, as it seemed to improve as the weekend progressed. Does anyone have a thermal infrared gun? If so, maybe we could get the exit oil check guys to scan everyone's motors after a race.

[Ashton Bond]

I've got one you guys can use. It's always right in the top of my pit box.

[tintop]

Thanks for the offer Ashton. Should be easy to setup some kind of temp check to let everyone know where their at.

[Ashton Bond]

Grab it anytime you want, I really only use it for tire temp checks before races, and the occasional diag for misfires. Just remember to switch it to "C" if your into that one of thang...