Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Oil pressure concern
914itis
post Apr 23 2014, 06:27 AM
Post #1


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
My drive to Hershey was flawless. I drive with the newly converted 6 for the first time a total of over 500 miles ov weekend.

The engine sounds great and handles great, however I have a glitch on the oil pressure gauge and light that I would like to figure it out and solved.

When the engine is cold and the car is idling at about 1200, the light is off and the pressure gauge goes up over the 3 mark, as the engine warms up it goes down to 1 at idle and will not go pass the 1 1/2 mark at any rpm as shown on the picture ;the light will come on at a full stop (1000 rpm)
I am using brad Penn 20x50 oil

I am wondering if it's the pressure sender or oil overfill.

All comments appreciated

The motor is 6yl stock 2.0


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Apr 23 2014, 06:34 AM
Post #2


Custom Member
***************

Group: Members
Posts: 24,562
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
Do you have an external cooler and thermostat?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 23 2014, 06:59 AM
Post #3


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
QUOTE(r_towle @ Apr 23 2014, 08:34 AM) *

Do you have an external cooler and thermostat?


No, just an aftermarket (PMS) tank at the factory location using AN fittings
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Apr 23 2014, 07:16 AM
Post #4


914 Wizard
**********

Group: Members
Posts: 11,612
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
Most likely loose tolerances (worn motor). And heats effect on the oil
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Apr 23 2014, 07:21 AM
Post #5


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
Can't speak for the oil light, but on flat sixes up to the 3.0L, the gauge was a 10 Bar (140 psig). Using a 10 Bar sender with a 5 Bar gauge might not work really well. Maybe you have a gauge / sender mismatch.

My gauge shows 0 at hot idle, but my oil light does not come on.

Overfilling will not cause a reduction in oil pressure. It will cause oil to be blown out of the tank thru the vent.

On cold startup, my engine throws 100+ psig at 2K RPM, but then settles down to about 10 psig per 1000 RPM.

Electrical gauges are subject to 40 year old wiring connections. I would buy a cheap mechanical gauge and plumb it in to verify your gauge readings.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 23 2014, 07:41 AM
Post #6


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
QUOTE(brant @ Apr 23 2014, 09:16 AM) *

Most likely loose tolerances (worn motor). And heats effect on the oil

Oil temp looks to be ok .
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Apr 23 2014, 09:00 AM
Post #7


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,490
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
QUOTE(914itis @ Apr 23 2014, 06:41 AM) *

QUOTE(brant @ Apr 23 2014, 09:16 AM) *

Most likely loose tolerances (worn motor). And heats effect on the oil

Oil temp looks to be ok .

I think Brandt meant the oil viscosity is effected by temp!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Randal
post Apr 23 2014, 09:09 AM
Post #8


Advanced Member
****

Group: Members
Posts: 4,446
Joined: 29-May 03
From: Los Altos, CA
Member No.: 750
QUOTE(SLITS @ Apr 23 2014, 06:21 AM) *

Can't speak for the oil light, but on flat sixes up to the 3.0L, the gauge was a 10 Bar (140 psig). Using a 10 Bar sender with a 5 Bar gauge might not work really well. Maybe you have a gauge / sender mismatch.

My gauge shows 0 at hot idle, but my oil light does not come on.

Overfilling will not cause a reduction in oil pressure. It will cause oil to be blown out of the tank thru the vent.

On cold startup, my engine throws 100+ psig at 2K RPM, but then settles down to about 10 psig per 1000 RPM.

Electrical gauges are subject to 40 year old wiring connections. I would buy a cheap mechanical gauge and plumb it in to verify your gauge readings.


+1

Mechanical gauges are great and give you piece of mind. I had a big red light installed on my dash that would light up if low oil pressure was experienced. Motors are expensive and gauges or warning lights cheap!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
stownsen914
post Apr 24 2014, 12:56 PM
Post #9


Senior Member
***

Group: Members
Posts: 912
Joined: 3-October 06
From: Ossining, NY
Member No.: 6,985
Region Association: None
QUOTE(SLITS @ Apr 23 2014, 09:21 AM) *

Can't speak for the oil light, but on flat sixes up to the 3.0L, the gauge was a 10 Bar (140 psig). Using a 10 Bar sender with a 5 Bar gauge might not work really well. Maybe you have a gauge / sender mismatch.


The above was my first thought ...

If you've got the right parts, sometimes they do go bad, so you can try swapping them out if you (or a budd) happen to have a spare.

Also make sure your ground is good.

Oil pressure is a really important thing to have right, so do figure it out before you run the engine much.

Scott
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Apr 24 2014, 01:50 PM
Post #10


914 Wizard
**********

Group: Members
Posts: 11,612
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE(stownsen914 @ Apr 24 2014, 12:56 PM) *

QUOTE(SLITS @ Apr 23 2014, 09:21 AM) *

Can't speak for the oil light, but on flat sixes up to the 3.0L, the gauge was a 10 Bar (140 psig). Using a 10 Bar sender with a 5 Bar gauge might not work really well. Maybe you have a gauge / sender mismatch.


The above was my first thought ...

If you've got the right parts, sometimes they do go bad, so you can try swapping them out if you (or a budd) happen to have a spare.

Also make sure your ground is good.

Oil pressure is a really important thing to have right, so do figure it out before you run the engine much.

Scott



I Agee you should figure this out.
What are the motor compression numbers and mileage.
Definitely worth trying the senders too
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
yeahmag
post Apr 24 2014, 03:29 PM
Post #11


Advanced Member
****

Group: Members
Posts: 2,421
Joined: 18-April 05
From: Pasadena, CA
Member No.: 3,946
Region Association: Southern California
I always wanted to mount a mechanical sender in the engine bay. What are you guys running for a quality unit?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cap'n Krusty
post Apr 24 2014, 04:01 PM
Post #12


Cap'n Krusty
**********

Group: Members
Posts: 10,794
Joined: 24-June 04
From: Santa Maria, CA
Member No.: 2,246
Region Association: Central California
911s, even the 2 liter engines, run what most non-Porsche people consider scary low oil pressure. When the 2.7 came to market, Porsche changed the oil pressure switch for the light to one with a lower threshold so the light wouldn't come on at idle. At this time, that switch is what you put in all the air cooled 911 engines. If your switch is working correctly and the light comes on at 900 RPM, you're running at less than .5 BAR. That's around 7 PSI. If your temps aren't unusually high, if you're running 20w50, and your idle isn't less than 900 RPM, you may have a problem. First thing I would suggest is installing updated cam tower oil fittings. They're somewhat more restrictive and should raise your overall oil pressure a little. After that, you may have to look into major surgery ......................

The Cap'n
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 24 2014, 04:40 PM
Post #13


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
I just spoke to a local expert who confirmed the capt'n's post about the low pressure on these 2 litter motors. As far as the pressure gauge, I will try a mechanical gauge and see the results.

Compression was at 175 lbs all around .

Motor runs great.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 26 2014, 06:00 AM
Post #14


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
Any recommendations , thread size on a mechanical pressure gauge that can be had at the local FLAPS?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 26 2014, 09:03 AM
Post #15


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
Feeling better today, I pulled the sender and it is a 10 bar gauge. That makes me feel a lot better.
As always you guys nailed it!

now on the hunt for a 5 bar sending unit.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Apr 26 2014, 09:25 AM
Post #16


914 Guru
*****

Group: Members
Posts: 5,569
Joined: 14-June 03
From: Orange County, CA
Member No.: 822
Region Association: Southern California
Pelican sells them.
I just bought one for my Tri gauge cluster
http://www.pelicanparts.com/cgi-bin/smart/...%2533%2529%2520
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 26 2014, 11:03 AM
Post #17


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
QUOTE(Steve @ Apr 26 2014, 11:25 AM) *

Pelican sells them.
I just bought one for my Tri gauge cluster
http://www.pelicanparts.com/cgi-bin/smart/...%2533%2529%2520


Thanks
That's a single . I need a dual sender .
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 26 2014, 11:42 AM
Post #18


914 Idiot
**********

Group: Members
Posts: 14,981
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
How about this one, then?

http://www.pelicanparts.com/cgi-bin/smart/...C%252Ffont%253E

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Apr 26 2014, 08:53 PM
Post #19


914 Guru
*****

Group: Members
Posts: 5,569
Joined: 14-June 03
From: Orange County, CA
Member No.: 822
Region Association: Southern California
QUOTE(Dave_Darling @ Apr 26 2014, 10:42 AM) *

How about this one, then?

http://www.pelicanparts.com/cgi-bin/smart/...C%252Ffont%253E

--DD


That would be equal to 5.5 bar. I guess that's close enough.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Apr 28 2014, 12:15 PM
Post #20


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
Picked up a 5 bar sender from the great Bruce . I got it today and my pressure is fine.
Thanks to you all.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 25th April 2024 - 04:24 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...