Quote:
Originally Posted by rice_classic
Look at Dezoris' chart here: http://www.ft86club.com/forums/showt...t=oil+pressure
As you can see, at oil temperatures that you run, you are NOT getting anywhere near your 10psi/1000rpm with your 30wt oil. Which what I've been trying to say all along.. the FA20 is NOT GOOD at making good oil pressure at high oil temps.
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That 10psi per 1000rpm figure is the general rule of thumb at ~220F and @7000 rpm doesn't apply to the higher temps or lower RPMs since there is a lateral relationship between the RPM and the pressures
see below chart and you'll notice 5w-30 already makes more than enough on 220F mark .. you can ignore the lowest and highest values since that sporadic jump is probably due to the incorrect readings..
you will also notice that the pressure changes are actually pretty steady between 240-260F, then again the correct way to read that data is to look at the median values (not the average values) .. you will also notice that between 10w-30 and 10w-40 there is not a big difference in terms of pressures in Dezoris' chart so why risk running the car with the viscosity out of the recommended range (less than 12 @100C as far as I can remember)
