what relation of the radiator cap to cooling down the water temp ?
A Radiator Cap can cause major overheating problems. Higher pressure cap can "capped" the boiling water circulating. Normally we use water + coolant, hence the boiling pressure is not that high.
But any value below 1.1 bar for high performance engine is a NO NO. Suggested Pressure Cap is 1.3 bar for track car, 1.5 for Drag.
i was thinkin more in line like a higher rated cap will put excess pressure on the radiator, increasing the chances of leakages. apparently thats not the case.
Radiator cap is like a pressure relief valve. Actually if u buy a high pressure cap, u are actually preventing liquid loss. But then again, your plumbing must be good in order to use these kind of caps.
Nissan never actually produced an RB30 with the Double Over Head Cam (DOHC) cylinder head for SKYLINE SILVIA or FAIRLADY. The RB30 block was produced by Nissan for the Holden company...