Brazilian Team (CBR 600 F4i Lubrication issues)

[Cobra EESC-USP]

Hi guys,
I´m a member of a brazilian team. Next year will be our first Formula SAE Competition on Pontiac, MI. We are using a CBR 600 F4i 2001 and we need help on the modification of the lubrication system. I´ve been reading topics concerning this subject and I´m in doubt between using baffles on a wet sump or using a dry sump system. Since we have few experience with this engine I kind prefer the baffling solution. It seems easier to do. I was wondering if you could give us some help with technical details, advices and pics of these two options. Any help will be very grateful.
You can send us an e-mail at formula@eesc.usp.br

Thanks,

André Poyares Bisordi
EESC-USP Formula Team
Escola de Engenharia de São Carlos
University of São Paulo

[Cobra EESC-USP]

Hi guys,
I´m a member of a brazilian team. Next year will be our first Formula SAE Competition on Pontiac, MI. We are using a CBR 600 F4i 2001 and we need help on the modification of the lubrication system. I´ve been reading topics concerning this subject and I´m in doubt between using baffles on a wet sump or using a dry sump system. Since we have few experience with this engine I kind prefer the baffling solution. It seems easier to do. I was wondering if you could give us some help with technical details, advices and pics of these two options. Any help will be very grateful.
You can send us an e-mail at formula@eesc.usp.br

Thanks,

André Poyares Bisordi
EESC-USP Formula Team
Escola de Engenharia de São Carlos
University of São Paulo

[Nick McNaughton]

A baffled wet sump can be made to work, and the F4i engine can tolerate a fair bit of overfilling. The stock sump isn't that bad a thing when the engine is overfilled. Just don't go doing continuous high-g corners in one direction. Also, connect the stock oil pressure switch to something for testing - either a big red light, or an ignition cut, depending on the situation. There's no sense melting a motor for testing's sake, but be sure to rewire it for the comp.

[jonno]

a light isn't enough, as I beleive it, the light on the F3 CBR lights at below half a bar. This is why we didn't compete at formula student 2004, sitting doing the noise test, ramp the engine up to 10,000rpm (stationary). the oil light never came on, but the bearings melted... twice...
morale of the story a light isn't sufficient, get an analog oil gauge, then the driver can see exactly what is going on. we typically run at around 6 bar on the F3, this drops within half a lap of the figure of eight to around 1 bar and keeps heading south, i've always stopped at that. This is on a baffled, overfilled system. no such issues on our dry sump.

[woollymoof]

We cut the sump volume by 600ml and still filled it with 3.5L of oil.

We noticed we were only get surge on right hand turns - oil goes to the left, the pick up is on the right of the engine/sump.

The primary reason for the problem is we had cut the shroud off the stock pick up to get the reduction in height. This exposed an enormous area of strainer that would suck air if any part of it was exposed.

The fix was to alter the height of the stock pick up by other means and rotate the inlet to the shroud towards the centre of the engine. The stock bike has the inlet forward facing. Futher to this there was a semi circular baffel, about 100mm in diameter and 50mm high, to the left of the pick up.

No oil surge. We used a pressure transducer in the pressure switch hole and logged it with Motec.