oil psi issues

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oil psi issues

Post  cool40 on July 13th 2013, 2:39 am

i finally got the new car down the track today. Smile  one problem i have is psi drop at the end of the track. some of you may recall the shut down at us43 aint very long but still has plenty of room to stop. if i jump on the brakes at the stripe it'll drop to 10 psi then recover if i let up but go back to damn near 0 when i turn off. it will jump back up to 70 quick as i get back on the gas but damn! affraid i never got a full pass made and only hit 128 mph on the last pass. this aint gona work out Crying or Very sad  it holds 70psi hot,kaase pump,20/50 green oil.and this pan.... what am i missing?
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Re: oil psi issues

Post  dfree383 on July 13th 2013, 2:55 am

Accusump?
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Re: oil psi issues

Post  bbf-falcon on July 13th 2013, 5:17 am

I agree that accu. is a must,but was also wondering about oil drainback issues w/block/heads.

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Re: oil psi issues

Post  Wheelie58 on July 13th 2013, 8:22 am

Is the oil restricted to the top end?
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Re: oil psi issues

Post  KY JELLY on July 13th 2013, 8:30 am

How many quarts of oil did you start with ?
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Re: oil psi issues

Post  LivermoreDave on July 13th 2013, 9:00 am

Until you decide how to control the oil, is shifting into neutral after the stripe a possibility?

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Re: oil psi issues

Post  richter69 on July 13th 2013, 10:08 am

accusump and quit messing w it.
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Re: oil psi issues

Post  Paul Kane on July 13th 2013, 10:29 am

It sounds as though the oil is flowing away from the pickup screen at deceleration. You need to take a good look at that pan and figure out what pan mods are necessary to keep the oil around the pickup and the pickup screen submerged in oil.

Paul
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Re: oil psi issues

Post  cool40 on July 13th 2013, 10:44 am

I thought about accusump or dry sump.i had 8 qts in it to start with and put 1 in after the first pass but it did'nt help any.i have restrictors in the front and back with .072 hole in them. I did hit neutral and kill the motor the last pass but that was real hard on the brakes:o 
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Re: oil psi issues

Post  LivermoreDave on July 13th 2013, 11:36 am

Those brakes are made for stopping .... I think that's what Nancy sang! Choose your poison, brake maintenance or engine damage. IMO, click to neutral and let the engine idle, at idle it will survive with low oil pressure, I'm not sure it will do the same at a high engine speed.

Just a note, if that pan and a properly located sump can't provide pressure with eight quarts plus of oil, there may be mechanical issues with the oil supply system. True, with more oil in the pan, it's difficult to control. The oil restrictors you mention are not adding to the problem, it's down low in the supply area.

Dave.


Last edited by LivermoreDave on July 13th 2013, 11:49 am; edited 1 time in total

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Re: oil psi issues

Post  Lem Evans on July 13th 2013, 11:43 am

9 qts is the bare minimum for that pan. It's the same style pan that KY ran for three years on his P51 engine. I'm sure he will check back in but, I think he wound up with 10 qts.

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Re: oil psi issues

Post  KY JELLY on July 13th 2013, 2:01 pm

I ran 10 quarts in mine , 9 1/2 would keep the oil pressure about 25-30 lbs but i just went with 10 made it easy to remember lol.

Here are some pics of my bearings out of that engine it had been beat to death 20 % nitro and m-5 . The bearings looked great , i did not use an accumilator and always ran schaefer oil and a jomar filter .





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Re: oil psi issues

Post  richter69 on July 13th 2013, 3:37 pm

richter69 wrote:accusump and quit messing w it.

bump
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Re: oil psi issues

Post  bbf-falcon on July 13th 2013, 3:48 pm

X2,Made a believer out of me when I was about 100'past finish line and just happened to notice my op drop down to 20#,about that same time the accu sump took over and the op came up to 60#. I remember thinking "cool".Wink 

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Re: oil psi issues

Post  cool40 on July 13th 2013, 3:56 pm

I may add another qt and see. That may be all it needs to fix it.i think i'll start looking for drysump parts Suspect 
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Re: oil psi issues

Post  richter69 on July 13th 2013, 5:30 pm

plus no dry starts w an accusump.

its just too simple to fix your issue this way.........a man needs to enjoy his track time not fight bullshit issues.
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Re: oil psi issues

Post  maverick on July 13th 2013, 6:14 pm

richter69 wrote:plus no dry starts w an accusump.

its just too simple to fix your issue this way.........a man needs to enjoy his track time not fight bullshit issues.

Well said. I vote Accusump, too.
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Re: oil psi issues

Post  John Myrick on July 13th 2013, 7:33 pm

add a quart and maybe get another baffle in the pan
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Re: oil psi issues

Post  David Cole on July 13th 2013, 10:01 pm

I've got that same pan and pump. .064 and .032 oil restrictors for valve train. Extra drainback holes and slicked up the originals. Valley painted with glyptol for faster drain back. Brad Penn 10W30 oil.

Honestly didn't know it was a 9 or 10 qt deal. I thought it was 7+ filter.

I run 7.5 + 2 qts for an accumulator. Total of 9 .5 qts. Hard on the brakes in a short shutdown the pressure will drop from 70 ish down about 15-20 before the accumulator catches it and it shoots back up as fast as it went down. 15-20 is not a lot, but at that point the engine is not under load.
The Moroso accumulator is plumbed into the block above the oil filter using -10 line and all straight fittings.


No ill effects so far. Knock on wood.
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Re: oil psi issues

Post  richter69 on July 13th 2013, 10:23 pm

my accumulator is open all the time..... works awesome.
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Re: oil psi issues

Post  cool40 on July 13th 2013, 11:59 pm

good info! thanks for all the help Very Happy good to know it can be dealt with that easy.
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Re: oil psi issues

Post  Lem Evans on July 15th 2013, 10:34 pm

Just gotta find a way to Velcro oil to the pan when a guy stands on the brakes.

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Re: oil psi issues

Post  cool40 on July 15th 2013, 10:49 pm

Lem Evans wrote:Just gotta find a way to Velcro oil to the pan when a guy stands on the brakes.
fast cars need brakes.tongue  i took the pan off yesterday and looked at it a while.then i put it back on.Idea 
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Re: oil psi issues

Post  soupbean on July 16th 2013, 1:16 am

Going to 10 quarts fixed my shut down oil pressure drop issues
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Re: oil psi issues

Post  Dave C. on July 16th 2013, 1:33 am

Good to hear! cheers 

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