Re: Flipped oil pressure needle revisited
What is the oil pressure supposed to read?
The "normal" reading can vary a lot depending on several factors. Particularly depending upon
which oil pump, and bypass valve spring is installed.
My observations on stock engines, with stock oil pumps and springs, 10-30 or straight 30 weight oil, have been thus:
3/4-ish cold start, and prior to complete warm-up.
1/2-ish at temp, off-idle.
1/4-3/8-ish at temp, at idle.
One of my Syclones has a "hi volume" (longer gears) oil pump with the yellow spring. It's cold reading is about 7/8-full scale with 10-30 oil. I've never observed any warm readings, as I've never driven it enough to get it warm.