Oil Starvation

[RickyG512]

Originally Posted by insite

very easy to get to. it's on the bottom of the oil pump facing downward. it really does take only a minute to change. you're right about the accusump; the first time i fired the car up w/ the accusump, i though the gage broke!

schematic photo of oil pump (change items 5, 25 & 26):

Hi there, I've got the 3 new parts, will the engine drain oil once I remove the bolt? Does the engine need to be empty of oil before I do this? Thanks

[911monty]

Originally Posted by RickyG512

Hi there, I've got the 3 new parts, will the engine drain oil once I remove the bolt? Does the engine need to be empty of oil before I do this? Thanks

No and No. The oil is in the sump and has to be picked up by the pump. Just oil the piston before you install.

[ChrisZang]

VERY interesting!

Would you think that this could be the possible solution to my "low oil pressure on the track" problem? http://986forum.com/forums/general-discussions/29545-low-oil-pressure-track.html

In a nutshell: Oil pressure drops mid-session

Thanks
Chris

Originally Posted by insite

another note on oil starvation:

there is a piston/spring assembly inside the oil pump that varies oil pressure with temperature. when the car is cold, it's designed to increase the pressure to around 100psi. once the car warms up, it backs off to 'normal'.

my car was running about 16-17psi (hot) at idle, which seems low to me. on a hunch, i ordered a new piston & spring. interestingly, the new piston has a chamfered edge whereas the original piston had a sharp edge. this leads me to believe that porsche suspected some binding of the piston assembly in some instances......

at any rate, with the new piston / spring installed, the car is now at 23psi hot. i never logged the oil pressure under load, so i have no idea what (if any) effect it has on pressure at RPM, but i certainly feel a little better. loss of oil pressure at temp is a big concern in the M96. anything that reduces the risk to that end is a win in my book. cost is less than $20 and you can do it in 5 minutes when you change your oil.

FYI, part numbers are:

Piston: 997.107.125.01 ($ 5.00)
Spring: 996.107.127.53 ($10.00)
Gasket: 996.107.123.50 ($ 2.00)

[insite]

Originally Posted by ChrisZang

VERY interesting!

Would you think that this could be the possible solution to my "low oil pressure on the track" problem? http://986forum.com/forums/general-discussions/29545-low-oil-pressure-track.html

In a nutshell: Oil pressure drops mid-session

since you're seeing a drop on straights as well as in the corners, i think it's absolutely possible.

also, not sure if you have an S. if you don't, upgrade to the S oil cooler. hot oil gets thin & pressure drops.

[The Radium King]

here is an option to get an x-51 style baffle in your car for a few less $$$, and without having to modify ...

New Oil Baffle - Pelican Parts Technical BBS

[Col986]

Originally Posted by insite

another note on oil starvation:

there is a piston/spring assembly inside the oil pump that varies oil pressure with temperature. when the car is cold, it's designed to increase the pressure to around 100psi. once the car warms up, it backs off to 'normal'.

my car was running about 16-17psi (hot) at idle, which seems low to me. on a hunch, i ordered a new piston & spring. interestingly, the new piston has a chamfered edge whereas the original piston had a sharp edge. this leads me to believe that porsche suspected some binding of the piston assembly in some instances......

at any rate, with the new piston / spring installed, the car is now at 23psi hot. i never logged the oil pressure under load, so i have no idea what (if any) effect it has on pressure at RPM, but i certainly feel a little better. loss of oil pressure at temp is a big concern in the M96. anything that reduces the risk to that end is a win in my book. cost is less than $20 and you can do it in 5 minutes when you change your oil.

FYI, part numbers are:

Piston: 997.107.125.01 ($ 5.00)
Spring: 996.107.127.53 ($10.00)
Gasket: 996.107.123.50 ($ 2.00)

I know this is a very old thread, however I looked back through all the old posts to see what upgrades I should do on my 2004 986 S (550 anniv) whilst doing the IMS upgrade.

I ordered the above mentioned parts, only to find they were identical to what was already installed. Not sure when the the upgraded parts became standard.

[BoxsterSteve]

Originally Posted by Col986

I know this is a very old thread, however I looked back through all the old posts to see what upgrades I should do on my 2004 986 S (550 anniv) whilst doing the IMS upgrade.

I ordered the above mentioned parts, only to find they were identical to what was already installed. Not sure when the the upgraded parts became standard.

I bought these parts too... less than $23 after taxes, a cheap DIY. Can't hurt after 15 years, I figure.
If I recall, these upgraded bits came onstream in 2003 or 2004, so I'm all in putting them in my 2000.

[Fyeganeh]

Originally Posted by insite

another note on oil starvation:

there is a piston/spring assembly inside the oil pump that varies oil pressure with temperature. when the car is cold, it's designed to increase the pressure to around 100psi. once the car warms up, it backs off to 'normal'.

my car was running about 16-17psi (hot) at idle, which seems low to me. on a hunch, i ordered a new piston & spring. interestingly, the new piston has a chamfered edge whereas the original piston had a sharp edge. this leads me to believe that porsche suspected some binding of the piston assembly in some instances......

at any rate, with the new piston / spring installed, the car is now at 23psi hot. i never logged the oil pressure under load, so i have no idea what (if any) effect it has on pressure at RPM, but i certainly feel a little better. loss of oil pressure at temp is a big concern in the M96. anything that reduces the risk to that end is a win in my book. cost is less than $20 and you can do it in 5 minutes when you change your oil.

FYI, part numbers are:

Piston: 997.107.125.01 ($ 5.00)
Spring: 996.107.127.53 ($10.00)
Gasket: 996.107.123.50 ($ 2.00)

So I know this is an old thread, but I was wondering about people's opinion on doing this "upgrade" or refresh on an oil pump piston, spring and gasket. Has anyone tried this? Did it help? If you haven't done it, what is the consensus on doing it? Could it hurt?

Any thoughts would be appreciated.
Fred

[steved0x]

Originally Posted by Fyeganeh

So I know this is an old thread, but I was wondering about people's opinion on doing this "upgrade" or refresh on an oil pump piston, spring and gasket. Has anyone tried this? Did it help? If you haven't done it, what is the consensus on doing it? Could it hurt?

Any thoughts would be appreciated.
Fred

I did it on my 2000S, but since I don't have any oil pressure monitoring I couldn't say whether it helped or not.

[Brad Roberts]

Heat is the reason the oil pressure is dropping. Waste of time to change out that spring. Add 3rd radiator/BoxsterS water lines to the 2.5 car.

[onaFLYer]

Originally Posted by Brad Roberts

Heat is the reason the oil pressure is dropping. Waste of time to change out that spring. Add 3rd radiator/BoxsterS water lines to the 2.5 car.

How about if you have an S, with third radiator and larger cooler already? And your engine is now toast, like mine?

[ChrisZang]

I have an "S" so unfortunately I have all of ths already ......
But fortunately the engine ain't toast, just my track sessions are usually a little short

Here is a summary of all the things I did so far, unfortunately with only little effect

So here's what I did:
* Replaced water pump
* installed LN engineering low-temp thermostat
* cleaned the radiators (also cleaned between the radiators and the AC condensers)
* switched from 15W50 to 10W40
* bled the coolant system twice
* checked that all the electric fans kick in
* checked pressure on the coolant lines to the front radiators

Originally Posted by Brad Roberts

Heat is the reason the oil pressure is dropping. Waste of time to change out that spring. Add 3rd radiator/BoxsterS water lines to the 2.5 car.

[The Radium King]

here is the new lne deep sump WITH x-51 baffle ...

osCommerce

[insite]

regardless of what brad says, that oil pressure releif spring / piston combo varies oil pressure with temperature. FYI, over time, springs sag. their spring RATES don't change, but their length WILL change. if this thing gets shorter, it bleeds off oil pressure.

if you're concerned about oil pressures, swap it out. it takes a couple of minutes during an oil change and costs less than $20. it improved my oil pressure at idle by 25%. it matters.

[ChrisZang]

A possible solution for a problem I am chasing for more than 6 months which costs around $20 and can be done n a few minutes during an oil change ?

You betcha I am gonna do this!

Originally Posted by insite

regardless of what brad says, that oil pressure releif spring / piston combo varies oil pressure with temperature. FYI, over time, springs sag. their spring RATES don't change, but their length WILL change. if this thing gets shorter, it bleeds off oil pressure.

if you're concerned about oil pressures, swap it out. it takes a couple of minutes during an oil change and costs less than $20. it improved my oil pressure at idle by 25%. it matters.

[onaFLYer]

Originally Posted by ChrisZang

A possible solution for a problem I am chasing for more than 6 months which costs around $20 and can be done n a few minutes during an oil change ?

You betcha I am gonna do this!

I'm with you. Only I have so many new parts going in I'd pay retail for this!

[jaykay]

Originally Posted by ChrisZang

A possible solution for a problem I am chasing for more than 6 months which costs around $20 and can be done n a few minutes during an oil change ?

You betcha I am gonna do this!

Chris did you ever get oil temp indication set up in your car?

[ChrisZang]

Originally Posted by jaykay

Chris did you ever get oil temp indication set up in your car?

Nope
Never got a good idea where to hook up the sensor.

I measured the oil temp with the Durametric when I came right from the track when it happened the last time and it wasn't all that bad, don't remember it exactly but I believe it was around 230, which is not too bad IMHO

[The Radium King]

can you get oil temp to show on your a/c display? code 1c as per below:

undocumentedacdiagnostics - mikefocke2

othwise, plx sells a lcd gauge that plugs into the obdii port, can read/display multiple parameters at once and has a customisable display. if you google 'boxster gauge pod' you can find a unit that mounts on the steering column quite easily.

[ChrisZang]

Originally Posted by jaykay

Chris did you ever get oil temp indication set up in your car?

Yep
Oil temp sensor