Oil pressure - what's best?

Anonymous · Post by **Anonymous** » Sun Aug 24, 08 9:31 pm

100 psi

, hope you're using a good quality filter.

65/75 psi full throttle , 40/50 psi @ idle , really don't think the HV oil pumps are worth fitting.

steveo · Post by **steveo** » Sun Aug 24, 08 10:37 pm

100 psi thats high but from memory normal blow up for a filter is about 120 /125 psi
what you got hv or a hp pump ... if you have tight bearing clearences , in most cases a stock a stock pump will do ..
looses bearing clearences etc & how the motor is built will dictate a need for a a hp or a hv pump
can always put a stock pressure relief spring in the pump .
what oil you using ??? could always step down one grade to something like 10w -40w or 15w-40w ... if your using 20w -50w .. don't use a cheap filter oil filter with that psi .
another bit of info you can get a adjustable pressure relief spring set up & you can adjust it on the car when the motor is running . for get who makes this part though ..might be milodon

i got a hv pump in mine , cold idle is 85 psi warm is 40 psi
anything over twenty five hunderd revs at normal opperating tempreture ..in my case 180 /5 degrees is 75/ 80ish psi
even a 5500 hundred still 80 psi

Kev · Post by **Kev** » Mon Aug 25, 08 7:55 am

Your biggest problem is the thin tin can of a filter with only a rolled steel lip trying to hold out with 100psi of pressure in it!!!

Kev · Post by **Kev** » Mon Aug 25, 08 10:44 am

It won't undo itself

It'll balloon out and either burst showering everything in oil or just blow out the threads and then shower everything in oil!!

Kev · Post by **Kev** » Tue Aug 26, 08 12:30 am

I remember me mate doing that and ending up with a blueish not very well painted fence!! (which ended up covered in beans when we ran out of aerosol cans and started on his kitchen cupboards) Empty hair spray cans went the best

Blue · Post by **Blue** » Tue Aug 26, 08 7:47 am

Definatly fit a proper oil pressure gauge to get an accurate reading. I have "ballooened" an oil filter with 100psi so that must be close to the burst point. I still use the 10 psi per 1000rpm rule. I cut 2 coils off the bypass spring to get 70 psi max with a little over 20 psi at idle with 15/40 oil, I don't see any need for more than that.

steveo · Post by **steveo** » Tue Aug 26, 08 12:08 pm

thats good info Blue

never thought to cut the spring to reduce pressure .. .. i was thinking to calm my oil pressure down also , as i rebembered the 10psi for every 1000 rpm ..

Dave999 · Post by **Dave999** » Tue Aug 26, 08 12:09 pm

too high and you can spin the drive on the shaft

too high and you just wear out the drive

Dave

Ian Z · Post by **Ian Z** » Tue Aug 26, 08 5:06 pm

b-l-0-0-d-y-h-e-l-l!

was he looking at the oil pressure at the time?

You must drive her up to Preston crooze next week.