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« on: July 22, 2013, 04:53:16 PM »
This may be the thread to bring this up,it dyed on the other board about a year ago.
Oil Presure v. Oil temp
Ive noticed with my FE going down the road,up to full temp I have right on the bypass spring just over 65psi,I call it 67psi,2300rpm. To my mind I'm bypassing oil all the time to maintain that pressure. I've ran it through the gears with a co pilot watching the OP gauge and he reported "0ver 80psi" at 6000 so the By Pass cant keep up. The clearences are tighter, over all internal leaks are less I guess. Thats with 20w50 Valvoline Syn.
Now back in the 00's (lol) I had a new 03 Mercury Marauder,being like all gear heads I wanted a real oil pressure gauge,the factory one was a fake never left 65psi when car was running. I put a real gauge in it and found it moved....alot from 10-15 at idle up to over 90 when cold on start up. All with 5w20 oil.
Back to the FE Mustang.
When it was cold here in Tx. I was a little late in changing oil and still had my normal 20w-50 in it. I was also doing my best to keep it "Show Ready" so I was wiping it down (over the top cleaning it really) EVERY NIGHT when I got home from work,about 11pm. The Oil Pan was HOT to the touch.
After a few weeks I got off my @$$ and changed the oil to 15w40,near same outside temps,high 40's(LOL Tx cold) same anal cleaning habbits(that sounds wroung) but the oil pan was bearly warm (?) The oil pressure at idle was down a little but going down the road the pressure was "just below" 65 at 2000 I didn't run it to see what MAX was. I thought about that pan surface temp drop and wondered if the bypass was just heating the oil for no reason?
My friend runs strait 60w oil in his Boss 302 track car with a big oil cooler because he looses OP due to the Oil Temp,car comes off the track at near 0 at idle with 40w,25psi with 60w, he says. I dont think he cares to debate the whys,he wants to see OP at idle,I dont know if it looses pressure at 8000rpm or not with lighter oil.
My thought on my street car is leaning toward swinging pressure up to 2000/2300 is no problem as long as I'm not in the bypass 100% of the time,this may actually lower my oil temp because I'm not bypassing excessively,even though my idle pressure will be about 20-25 at 900rpm,so dropping back to a 10w30 will be ok as long as I maintain 10psi per 1000rpm+ 10psi or so. I'm thinking 70psi at 6000rpm?
IF I still show oil pressure do I want to run the thinnest oil that maintains pressure at idle? What am I loosing with a thinner oil? Will my solid Flat tappet cam hate me with lower oil pressure/thinner oil(Film Strength)?
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I hate pulling oil pans.
You will never see a book titled "The Great FE Oil Pan Comparo" LOL!