Re: High Pressure cooling system? (NC Rick)
Here's what one of the M.A.D. members said about the system...
"The existing street and race bike cooling systems are capable of being pressurized to 1.1 BAR (1.1 times the existing atmospheric pressure or equivalent to 16.5 PSI [1 BAR = 15 PSI]), as is evident from the pressure release cap on the plastic reservoir. However, the existing system receives its pressure from the buildup of heat through the normal process of the engine running and not from an external source.
I doubt that the current plastic expansion tank could handle much more than these pressures.
Most radiators are designed to handle 50-60 PSI and are frequently tested to these pressures.
The fabricated aluminum expansion tank with the Schrader valve present at the top would indicate the team is utilizing a compressed gas (most likely air) to pressurize the system to attain a higher boiling point for the coolant. The higher the pressure, the more heat the cooling medium can absorb from the engine and dissipate through the radiator without boiling.
Also, note the hex fitting with the clear hose on the right side of the tower where the Schrader valve is located. This is most likely a pressure release valve (tunable spring/ball action) designed to relieve the system of excess pressure to save seals/hoses from blowing.
Ever removed the radiator cap from your vehicle after a long trip?
The coolant wasn't boiling but when you suddenly lower the pressure it immediately boils and rushes out to greet you!
Just my 2 cents worth!"
Photos are here <A HREF="http://www.superbikeplanet.com/image/2005ama/searspoint/tim-04/
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