Quote:
Originally Posted by Irace86.2.0
@ ETM_Shaman
Have you considered testing the stock pickup tube pressure or inlet pressure with 0w20 or even 5w30 instead of your 10W40? Perhaps the heavy grade oil was the problem all along.
Skip to 1:20. If the cavitation you are trying to resolve is from starving the pump then couldn't higher viscosity oil be the problem?
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When I had the failure using 10W60 I was sure it had to do with the problem (after all, main gallery pressures changed a lot when going from 10W40 to 10W60). Then I found the GT86 CS-V3 User Manual:
https://www.racingbytmg.com/wp-conte...anual_EN-1.pdf
If you go to page 108 you'll see they use Elf HTX 825 10W-60 oil.
These cars have stock engines and are well proven so I guess the 10W60 oil is not an FA20 engine killer.
Even so I think thinner oil will allow better (closer to atmospheric) inlet pressures. I think the tests you suggest would be very interesting but to tell you the truth I don't think I'll go through the hassle of changing three different oils (including the oil cooler flush to get it all out). I had problems with 10W40, 15W50 and 10W60 oils. Always with the same clearances. I wouldn't run 0W20 oil with those clearances either, but it would also be an interesting experiment. I would've loved to have thought of the inlet pressure tap from day 1 of the first rebuild and I probably would've learned a lot and saved time and money.