home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

Reply
 
Thread Tools Display Modes
Old 06-15-2021, 09:35 PM   #1
RoadRacer4Life
Owner: DeathWagon
 
RoadRacer4Life's Avatar
 
Join Date: Jul 2005
Location: Montgomery Alabama
Default Oil pressure how low is too low?

The oil pressure in the ole Champ wagon has never been stellar but I was curious what's considered too low.

Hot oil pressure is like 15psi at idle 800-900rpm
Hot oil pressure is around 40-45 psi at 5000rpm.

Time to build it?
Replace oil pump?

Already recently replaced oil feed tube seals so I doubt that's an issue..


-Sam
__________________
Quote:
Originally Posted by linuxman51 View Post
Threads like this continue to underline the fact that none of yall are ever actually going to catch me.
90 245GL 2JSWEDE 2JZ 245...
91 245GL Team Battle Wagon Chumpcar
93 245GL Street Beater
RoadRacer4Life is offline   Reply With Quote
Old 06-15-2021, 10:22 PM   #2
Dan
Fought Covid and won
 
Dan's Avatar
 
Join Date: Jun 2002
Location: Superior, Montana
Default

It's on the low side, but not dangerously low, motor is tired, not shot. what weight oil? I used to up the weight or add STP type additive to buy time
__________________
1985 Chevy TPI V8 740.
Dan is offline   Reply With Quote
Old 06-16-2021, 09:58 AM   #3
kyote
Living The Dream
 
kyote's Avatar
 
Join Date: Apr 2003
Location: La Porte TX
Default

I've always heard the 1psi per 100 rpm at hot idle was about the minimum before it would give up the ghost. You're getting pretty close to that. Time for Lucas?
__________________
-78 242 tic, a kyotefab/willettrun joint
-83 245 tic, daily in progress
-14 F150 FX4 3.5 EcoBeast (Wife's)
kyote is offline   Reply With Quote
Old 06-16-2021, 10:01 AM   #4
VB242
Beep beep zip tang
 
VB242's Avatar
 
Join Date: Sep 2011
Location: The Right Coast
Default

You should have slapped some new bearings in there when you did the oil feed seals.
__________________
Quote:
Originally Posted by 240240 View Post
I'm shocked someone actually took me seriously.
VB242 is offline   Reply With Quote
Old 06-16-2021, 11:11 AM   #5
shoestring
Board Member
 
shoestring's Avatar
 
Join Date: Jun 2009
Location: Swampscott, 01907
Default

Different kind of how many psi can a stock support

In our race car we ran 20w50 Castrol, later squirter block. Hot we had about 20psi, and at full chat it would just tickle 50. We do have fresh bearings in the bottom end, though, for what that's worth.
__________________
I AM THE MODAL AMERICAN. Planet money #936.
shoestring is offline   Reply With Quote
Old 06-16-2021, 12:06 PM   #6
rb92673
Board Member
 
Join Date: Jan 2017
Location: San Clemente
Default

My rebuilt squirter with new bearings and oil pump seems to run 20 at idle and about 45-50 psi above 3k. VDO gauge/sender. 15W-40 diesel oil. It does drop on long left hander turns.
rb92673 is offline   Reply With Quote
Old 06-16-2021, 12:07 PM   #7
cosbySweater
Board Member
 
cosbySweater's Avatar
 
Join Date: Jul 2009
Location: Monterey/Falun
Default

what oil cooler are you running?
__________________
1974 AMC Gremlin, lq4, 7875 billet, ss2 cam, 80e, 3600 stall converter, Holley Terminator x
1984 Volvo 245 Om606td, 722.6, Lifted
1995 Porsche 993
2013 VW Passat TDI
Quote:
Originally Posted by bricktop420 View Post
Thank you very much everybody... i now feel sufficiently retarded and will go cry in the corner...
cosbySweater is online now   Reply With Quote
Old 06-16-2021, 01:46 PM   #8
90volvo
Board Member
 
Join Date: May 2017
Location: Eldorado Springs Mo.
Default

On my recent rebuilt engine, its running 10 at hot idle and 50 at 3000 rpm. I believe has something to do with oil cooler. I did shorten my oil cooler lines and that helped. I was told running 10an lines are to big and if I switched to 8an oil pressure would increase. I think my engine is fine, I do run my idle up higer than most to keep oil pressure from dropping to low. I know rodders like low idle to hear the cam loping. But even in a ford you oil pressure drops big time.
__________________
90 Volvo 240-my current setup.
B230ft rebuilt -MS-Turbo-E85

1985 240 Work in progress.

sons car- 93 240-15g turbo-chipped-95,000 miles. Slick car

Leave feedback- http://forums.turbobricks.com/showthread.php?t=355413
90volvo is offline   Reply With Quote
Old 06-16-2021, 02:30 PM   #9
Harlard
Hurlurd?Harland?Bueller?
 
Harlard's Avatar
 
Join Date: May 2007
Location: PDX
Default

Quote:
Originally Posted by cosbySweater View Post
what oil cooler are you running?
The 240T cooler makes idle oil pressure pretty low, ~14 psi, on my car, FWIW.
__________________


Herr Harlard am Erstens

1979 242 DL

Quote:
Originally Posted by t8fanning View Post
My knob has a big chunk of steel on it
Harlard is offline   Reply With Quote
Old 06-16-2021, 10:52 PM   #10
cosbySweater
Board Member
 
cosbySweater's Avatar
 
Join Date: Jul 2009
Location: Monterey/Falun
Default

Quote:
Originally Posted by Harlard View Post
The 240T cooler makes idle oil pressure pretty low, ~14 psi, on my car, FWIW.
Exactly why I ask
cosbySweater is online now   Reply With Quote
Old 06-17-2021, 12:16 AM   #11
spock345
Board Member
 
spock345's Avatar
 
Join Date: Nov 2016
Location: Santa Cruz, CA
Default

With redblocks I've just come to not worry so much about oil pressure so long as the light doesn't flicker at idle or drop below 1 bar (~14psi) on a hot idle. B18, B20, and B230 motors have already a wide variety of oil pressure values for me. Usually on the lower end when hot even with thicker oil (15w40 or 20w50) and a relatively fresh motor.
__________________
1967 122s, carbed B20F, M41, the sports tractor
1998 S70, grandma-mobile
1989 240 B230F, V15 cam, chipped EZK, M47 swap (Lost a fight with a Chevy express van), the millenial falcon
2012 VW Tiguan (screw plastic water pumps), daily
spock345 is offline   Reply With Quote
Old 06-17-2021, 01:05 AM   #12
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

Bmw makes 10w60 oil...
__________________

1990 240dl Kaplhenke Coilover Daily
1991 245+16 Valve Turbo Microsquirt
Need Hyundai or Genesis parts? PM me for Genuine Hyundai or Genesis parts
Marvelous3 is offline   Reply With Quote
Old 06-17-2021, 09:53 AM   #13
rb92673
Board Member
 
Join Date: Jan 2017
Location: San Clemente
Default

Quote:
Originally Posted by cosbySweater View Post
what oil cooler are you running?
On mine I have an oil cooler and a remote oil filter. No idea who made the oil cooler.
rb92673 is offline   Reply With Quote
Old 06-17-2021, 10:26 AM   #14
283SD
Board Member
 
Join Date: Mar 2008
Default

Main and rod bearing clearance, will be the key to oil pressure, and oil pump out put volume is another factor . Small oil lines to cooler/remote filter restrict oil flow. I run -10 lines on the V8 car with remote oil filter [1&1/2 quart] and 16 row oil cooler. My MG Midget 1275cc runs -10 lines, remote oil filter,13 row oil cooler, 70psi hot @ WOT [8,500 RPM] I,m going to up the pressure relief valve. Bearing clearance and oil pump out put and volume are the key to oil pressure. A good rule of thumb is 10 lbs per 1000 rpm The Midget runs 40 lbs at idle hot @ 1,100 RPM.
283SD is offline   Reply With Quote
Old 06-17-2021, 10:30 AM   #15
VB242
Beep beep zip tang
 
VB242's Avatar
 
Join Date: Sep 2011
Location: The Right Coast
Default

OP, did you install piston squirter by any chance?
VB242 is offline   Reply With Quote
Old 06-17-2021, 11:30 AM   #16
gsellstr
Vintage anti-ricer
 
gsellstr's Avatar
 
Join Date: Oct 2004
Location: Somewhere in a northern California smog bank
Default

Noticed a drop in pressure when I swapped in the RX7 cooler. Needed new fittings, ran 1/2" push-lock hose from the stock hardlines to the RX7 banjo's. Factory squirter, hot idle with decent bearing clearances and an M181 pump, running 10w40 M1 is around 1.8-2b, hot cruise at around 2600 is around 2.8b, hot 4500rpm is around 3.2b.
__________________
RIP
Doug Williams "Mr. Doug" 4/15/2009
Pete Fluitman "fivehundred" 7/14/2013
Mick Starkey "TrickMick" 1/10/14
Mark Baldwin "blue850t5" 7/19/18
Nick Fengler "fengler" 8/6/18
Thomas Fritz "stealthfti" 10/11/18


74 144 B20
http://forums.turbobricks.com/showthread.php?t=224983

90 745Ti
http://forums.turbobricks.com/showthread.php?t=334698

If you need Superpro bushings PM me for price and availability!
gsellstr is offline   Reply With Quote
Old 06-17-2021, 02:51 PM   #17
MikeSr.
What, me worry?
 
MikeSr.'s Avatar
 
Join Date: May 2003
Location: Acworth, Ga. USA
Default

My stock B21ft in the flathood runs low at hot idle, but the light never flickers- it has had bearings and pump done in the past.
__________________
I coulda had a V8!
MikeSr. is offline   Reply With Quote
Old 06-17-2021, 06:39 PM   #18
mck1117
Board Member
 
Join Date: Jul 2016
Default

We ran a full day of endurance racing with a paper towel jammed in the oil pump inlet, running 20-23psi at wide open, high RPM. Rod bearings looked great! 15 at idle is just fine.
mck1117 is offline   Reply With Quote
Old 06-18-2021, 12:51 AM   #19
bobxyz
Board Member
 
bobxyz's Avatar
 
Join Date: Aug 2014
Location: Boulder CO
Default

From my yellowing 1985 GLT Owner's Manual:





My original ~350K miles B21FT engine definitely flickered at idle when hot. My rebuilt B21FT doesn't flicker, but the hot idle pressure is certainly way on the left of the gauge. And yes, the pressure noticeably drops when the oil cooler thermostat opens.
__________________
'85 245glt b21ft aw71 k-jet -> lh2.4
bobxyz is offline   Reply With Quote
Old 06-18-2021, 06:10 PM   #20
AnthonyHardy2
Board Member
 
AnthonyHardy2's Avatar
 
Join Date: Aug 2010
Location: Oakland, CA
Default

I ran my NA B23 for about 8 months/10k miles with 15w40 oil with the oil pressure at about 8psi@idle/35psi@3-4k. The oil pressure light was on solid until about 1500 rpm and it ran fine until I pulled the engine so yours probably won't blow up or anything
AnthonyHardy2 is online now   Reply With Quote
Old 06-21-2021, 09:57 AM   #21
RoadRacer4Life
Owner: DeathWagon
 
RoadRacer4Life's Avatar
 
Join Date: Jul 2005
Location: Montgomery Alabama
Default

Thanks for all the info fellas.. After more research I think I'm still in good shape.. This engine has never been out of the car so I was a bit worried but considering I run both the 740/940 oil/water cooler plus a large external oil cooler plus an external oil filter and I'm using the oil pressure switch to feed both the oil pressure gauge plus switch plus the turbo oil feed that my 25 year old VDO electric oil pressure gauge might be reading just a tad low.. Car still runs great.. I'll upload some video from this weekends PCA track day shortly.

-Sam


Last edited by RoadRacer4Life; 06-21-2021 at 10:02 AM..
RoadRacer4Life is offline   Reply With Quote
Old 06-21-2021, 11:07 AM   #22
mikep
The MP
 
mikep's Avatar
 
Join Date: May 2003
Location: 38° 27' N 75° 29' W
Default

Excellent.

Quote:
Originally Posted by Marvelous3 View Post
Bmw makes 10w60 oil...
eww..
(not a fan of the loads of VI improvers in those wide spread oils, especially in a performance engine)
__________________
mikep is offline   Reply With Quote
Old 06-21-2021, 05:36 PM   #23
gsellstr
Vintage anti-ricer
 
gsellstr's Avatar
 
Join Date: Oct 2004
Location: Somewhere in a northern California smog bank
Default

I did finally replace my old sender when it started getting twitchy, definitely picked up some oil pressure, or at least reported pressure once things got hot. The old sender didn't take to heat very well, so there was a broader spread in pressure between hot and cold, also a lack of pressure build with RPM when it got hot.
gsellstr is offline   Reply With Quote
Old 06-21-2021, 05:44 PM   #24
Cwazywazy
Single jingle
 
Cwazywazy's Avatar
 
Join Date: Aug 2016
Location: Granby CT
Default

I used to get 1 bar with warm idle and close to half a bar with very hot idle (after beating on the car)

Since adding the air/oil cooler setup, I now see half a bar at warm/hot idle. I think oil pressure when driving also went down a bit, it's something like 2-2.5bar at 2000rpm.

I'm considering getting rid of the oil gauge, it's too stressful to look at in traffic.
__________________
I don't know what I have
Cwazywazy is offline   Reply With Quote
Old 06-21-2021, 11:38 PM   #25
lummert
Board Member
 
lummert's Avatar
 
Join Date: Jan 2008
Location: Portland IN
Default

10 psi per 1000 rpm is what I was always told.
__________________
Trying to understand stupid people is like trying to pick up a turd by the clean end.
lummert is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 02:08 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.