05-14-2015, 05:17 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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The most important temperature is coolant. You want to see 80C / 177F minimum. This may require a 195 thermostat. See a thermostat is fully open at its set point but does not fully close until 10F below it. The spf coolant system is so huge, if you use a 180f thermostat your temps will be around 165F or 70C since your thermostat won't close before 170F? If you have one of those high performance thermostats you may never get above 160f as they never close. Get the old cheap kind that have a tiny button to let air purge. Cold cylinders and hot piston equal excessive wear. Optimism temp for combustion is 212.
As far as oil I had a Roush which had 42 psig oil pressure at 6K rpm and suffered no ill effects. Turned out the oil pump RV spring was wrong but the learning was 42 psig was enough even at 6K rpm. Anything above 60 psig when engine is hot is pure waste and increases engine wear. The heavier the oil the hotter it runs. 20W50 will run 5-7F hotter than 10W40. I never like seeing oil temps higher than 100C for any extended time. That being said if I didn't use a plexiglass plate over oil cooler in winter oil would take FOREVER to get to 70C, only time oil cooler was of value was in summer and beating the snot of it.
Summary:
Water - 80C minimum
Oil - 90C-100C
Oil Pressure 55-60 psig at 6K rpm.
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