Oil pressure drop at Track
#1
RE for life
Thread Starter
Oil pressure drop at Track
my car is 13B PP 290WHP at 8500 RPM . with Comp oil pump n comp regulator
one thing really bother me is
althought i shim my regulator on 130PSI at idle
but after few lap on track the pressure will drop between 95-105 on main straigh way
that really bother me a bit i know one reason is oil foaming on high speed
but i already have oil pan plate n accusump(100 psi)
any suggestion on how to keep my oil psi above 120 at WOT ?
btw i am using liqu molly 10-60w( sponser) i am thinking to change to different type of oil next time like 20-50
thanks for your time
J
one thing really bother me is
althought i shim my regulator on 130PSI at idle
but after few lap on track the pressure will drop between 95-105 on main straigh way
that really bother me a bit i know one reason is oil foaming on high speed
but i already have oil pan plate n accusump(100 psi)
any suggestion on how to keep my oil psi above 120 at WOT ?
btw i am using liqu molly 10-60w( sponser) i am thinking to change to different type of oil next time like 20-50
thanks for your time
J
#2
RE for life
Thread Starter
here are my lastest pic of my race car
thing to do at off season better aero balance
cover up front wheel more
solve my oil pressure problem n my tri link suspension
https://www.rx7club.com/attachment.p...1&d=1386069652
thing to do at off season better aero balance
cover up front wheel more
solve my oil pressure problem n my tri link suspension
https://www.rx7club.com/attachment.p...1&d=1386069652
#4
Rotary Freak
iTrader: (5)
i'm a bit curious is oil pressure that high really bad ? I thought anything about above 60 is good.
Why do you guys run somuch more ?? sorry I know this is off topic but just curious .
And does this happen in every track is your engine temps going up
have you checked for excessive fuel dilution ?
Why do you guys run somuch more ?? sorry I know this is off topic but just curious .
And does this happen in every track is your engine temps going up
have you checked for excessive fuel dilution ?
#5
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,778
Received 2,563 Likes
on
1,823 Posts
Trending Topics
#9
Rotary Freak
iTrader: (5)
Oh I see thanks..
i'd also be interested in knowing what most people run PSI wise , and what RPM.
say my motor is balanced and rotated to run to 9000 ,
But I set the limit at 8600 for safety margin .
but now with the whole PSI question I wonder if my Oil pressure is up to snuff at those levels .
Also I do know that the centrifugal forces push oil out of the Eshaft at such high rpms . but I didn't know people ran that much oil pressure.
Last edited by Tem120; 12-04-13 at 11:45 AM.
#10
RE for life
Thread Starter
Oh I see thanks..
i'd also be interested in knowing what most people run PSI wise , and what RPM.
say my motor is balanced and rotated to run to 9000 ,
But I set the limit at 8600 for safety margin .
but now with the whole PSI question I wonder if my Oil pressure is up to snuff at those levels .
Also I do know that the centrifugal forces push oil out of the Eshaft at such high rpms . but I didn't know people ran that much oil pressure.
i'd also be interested in knowing what most people run PSI wise , and what RPM.
say my motor is balanced and rotated to run to 9000 ,
But I set the limit at 8600 for safety margin .
but now with the whole PSI question I wonder if my Oil pressure is up to snuff at those levels .
Also I do know that the centrifugal forces push oil out of the Eshaft at such high rpms . but I didn't know people ran that much oil pressure.
Then u know in order to safely rev pass 8000
For extended of time
That is oil psi u need
#11
RE for life
Thread Starter
Oh I see thanks..
i'd also be interested in knowing what most people run PSI wise , and what RPM.
say my motor is balanced and rotated to run to 9000 ,
But I set the limit at 8600 for safety margin .
but now with the whole PSI question I wonder if my Oil pressure is up to snuff at those levels .
Also I do know that the centrifugal forces push oil out of the Eshaft at such high rpms . but I didn't know people ran that much oil pressure.
i'd also be interested in knowing what most people run PSI wise , and what RPM.
say my motor is balanced and rotated to run to 9000 ,
But I set the limit at 8600 for safety margin .
but now with the whole PSI question I wonder if my Oil pressure is up to snuff at those levels .
Also I do know that the centrifugal forces push oil out of the Eshaft at such high rpms . but I didn't know people ran that much oil pressure.
Then u know in order to safely rev pass 8000
For extended of time
That is oil psi u need
#12
Rotary Freak
iTrader: (5)
oh i see, whats the downside of running somuch oil pressure ???
on a regular car , running such higher oil pressure doesn't that put stress on the oil seals ?
my builder did do some oil pressure mods so I believe my oilpressure is at like 90psi . but thats at around 3000 rpms I havent had a chance to abuse the motor since it was getting broken in still .
And again , I feel like I'm hijacking your thread so I apologize.
#13
Rotary Freak
This is very interesting as I confirmed the same thing myself without even knowing this. When my engine was brand new it would pull 130+psi at idle and cold. When hot it would drop to about 80 psi at idle using 10-40 any brand. After about 20 hours of running time the engine would still pull 120 at idle cold but hot (900 to 1000 rpm) the idle pressure would be about 40 psi and jump to 100+ when I picked up the rpm a bit. On track with the 10-40 the oil pressures would fluctuate a fair bit when temps got up higher, so I swapped to 20-50 Q Racing oil. That would work great for the first weekend, but for the second weekend pressures would drop again.
For my last race this past fall, I changed back to the Redline straight 40w again and bingo all pressures were like it originally was when the engine was first built and I didn't see a pressure drop even when oil temps got above 240 degrees (drafting too close for too long).
The only downside is the oil warm up does take longer in the morning.
Eric
For my last race this past fall, I changed back to the Redline straight 40w again and bingo all pressures were like it originally was when the engine was first built and I didn't see a pressure drop even when oil temps got above 240 degrees (drafting too close for too long).
The only downside is the oil warm up does take longer in the morning.
Eric
#14
Living on the North Coast
iTrader: (31)
https://www.wolverineheater.com/Engi...ars-s/1814.htm
#15
RE for life
Thread Starter
This is very interesting as I confirmed the same thing myself without even knowing this. When my engine was brand new it would pull 130+psi at idle and cold. When hot it would drop to about 80 psi at idle using 10-40 any brand. After about 20 hours of running time the engine would still pull 120 at idle cold but hot (900 to 1000 rpm) the idle pressure would be about 40 psi and jump to 100+ when I picked up the rpm a bit. On track with the 10-40 the oil pressures would fluctuate a fair bit when temps got up higher, so I swapped to 20-50 Q Racing oil. That would work great for the first weekend, but for the second weekend pressures would drop again.
For my last race this past fall, I changed back to the Redline straight 40w again and bingo all pressures were like it originally was when the engine was first built and I didn't see a pressure drop even when oil temps got above 240 degrees (drafting too close for too long).
The only downside is the oil warm up does take longer in the morning.
Eric
For my last race this past fall, I changed back to the Redline straight 40w again and bingo all pressures were like it originally was when the engine was first built and I didn't see a pressure drop even when oil temps got above 240 degrees (drafting too close for too long).
The only downside is the oil warm up does take longer in the morning.
Eric
this mean from next year on i will be import my oil from state............. the only car use 20-50 here is the disel truck..............
#16
RE for life
Thread Starter
oh i see, whats the downside of running somuch oil pressure ???
on a regular car , running such higher oil pressure doesn't that put stress on the oil seals ?
my builder did do some oil pressure mods so I believe my oilpressure is at like 90psi . but thats at around 3000 rpms I havent had a chance to abuse the motor since it was getting broken in still .
And again , I feel like I'm hijacking your thread so I apologize.
on a regular car , running such higher oil pressure doesn't that put stress on the oil seals ?
my builder did do some oil pressure mods so I believe my oilpressure is at like 90psi . but thats at around 3000 rpms I havent had a chance to abuse the motor since it was getting broken in still .
And again , I feel like I'm hijacking your thread so I apologize.
What kind of engine u have u what hp n rpm u rev ?
#17
Rotary Freak
iTrader: (5)
But I set my limit at 8600 for a safe margin of error , but now I'm wondering if i have enough oil pressure for that . I have a soft limiter at 8600 timing retard and then a hard fuel cut at 9k
power should end up being somewhere between 330-350
medium street port
new oil pump , since a bad oil pump and low oil pressure is what caused my motor to blow in the first place .
my oil reads about 90 while cruising at 3k , I haven't revd past 6k yet .
Last edited by Tem120; 12-05-13 at 10:42 PM.
#18
RE for life
Thread Starter
13b REW , recently rebuilt balanced and rotated till 9300 rpms ,
But I set my limit at 8600 for a safe margin of error , but now I'm wondering if i have enough oil pressure for that . I have a soft limiter at 8600 timing retard and then a hard fuel cut at 9k
power should end up being somewhere between 330-350
medium street port
new oil pump , since a bad oil pump and low oil pressure is what caused my motor to blow in the first place .
my oil reads about 90 while cruising at 3k , I haven't revd past 6k yet .
But I set my limit at 8600 for a safe margin of error , but now I'm wondering if i have enough oil pressure for that . I have a soft limiter at 8600 timing retard and then a hard fuel cut at 9k
power should end up being somewhere between 330-350
medium street port
new oil pump , since a bad oil pump and low oil pressure is what caused my motor to blow in the first place .
my oil reads about 90 while cruising at 3k , I haven't revd past 6k yet .
Rotary Tech Tips: Oil Cooling Tips
If stock FD have 115 PSI at WOT
so i suggest to shim it to get higher oil pressure
#19
Rotary Freak
iTrader: (5)
Rotary Tech Tips: Oil Cooling Tips
If stock FD have 115 PSI at WOT
so i suggest to shim it to get higher oil pressure
If stock FD have 115 PSI at WOT
so i suggest to shim it to get higher oil pressure
thank you , and I believe it was shimmed
But my car had such terrible oil pressure before that I dont know if its higher then stock or normal LOL
I used to have 30 psi at WOT till 8k
And 10 psi at idle
#20
RE for life
Thread Starter
Put a know good mechanical gauge to confirm ur oil psi
#22
RE for life
Thread Starter
It happend to my friended motor once
So all the oil let go to front
Cause engine seeze at the Raer
Thread
Thread Starter
Forum
Replies
Last Post