Spec Boxster Build

[thstone]

The more I learn, the less I know.

It seems that the only way to be sure of maintaining oil pressure (to the largest extent) is to use an EPC-based Accusump system. Anything less will leave open a window of uncertainty. Baffles, windage trays, deep sumps, etc. are all steps in the right direction but they don't seem to guarantee what an Accusump can.

The other concern not yet mentioned in this discussion is oil temp and film strength. It appears to be critical to never let the oil get too hot. Thus, I am looking into a data logging system that can provide temp alerts and possibly an external oil cooler.

I'll have to continue researching these subjects. Right now, not exactly sure what to do.

[seningen]

Originally Posted by thstone

The more I learn, the less I know.

It seems that the only way to be sure of maintaining oil pressure (to the largest extent) is to use an EPC-based Accusump system. Anything less will leave open a window of uncertainty. Baffles, windage trays, deep sumps, etc. are all steps in the right direction but they don't seem to guarantee what an Accusump can.

The other concern not yet mentioned in this discussion is oil temp and film strength. It appears to be critical to never let the oil get too hot. Thus, I am looking into a data logging system that can provide temp alerts and possibly an external oil cooler.

I'll have to continue researching these subjects. Right now, not exactly sure what to do.

I lost a 944 engine within accusump

We've been lucky since adding an oil cooler and running amsoil.

Is that the key? I don't know.

My next plan for my boxster s is an oil cooler and low temp
Thermostat.

Not sure I'll go all the way to an accusump.

Mike

[thstone]

Originally Posted by seningen

I lost a 944 engine within accusump

We've been lucky since adding an oil cooler and running amsoil.

Is that the key? I don't know.

My next plan for my boxster s is an oil cooler and low temp
Thermostat.

Not sure I'll go all the way to an accusump.

Mike

Thanks for the input Mike! My car already has a low temp t-stat. I am also looking at oil coolers and saw your post in the Spec Boxster area on Rennlist. Let me know if you learn something that doesn't get posted.

[seningen]

Originally Posted by thstone

Thanks for the input Mike! My car already has a low temp t-stat. I am also looking at oil coolers and saw your post in the Spec Boxster area on Rennlist. Let me know if you learn something that doesn't get posted.

Need to see if I can find it again, but I saw a nice looking setup
Where they ran an accusump and remote oil filter in the trunk and
Two coolers in the rear bumper area, one for oil and one for tranny.

Not that I want more weight in the back...

I wouldn't run the oil cooler up front, although
That is what my RSR does, but 911s are used to pushing oil to the dry sump
And it does help with weight distribution.

My S already has the 3rd radiator.

I've seen a setup that deletes the oil/water radiator on top of the block and takes the oil from there for circulation, however I think most take it off the filter housing.

I'll look for the pictures of that setup.
I had sent a q about a turnkey system but got no response.

I'm also considering a forced air setup in the triangle
In the bracing are near tranny, but not in love with oil cooling near exhaust
But that maybe no different than rear bumper

FOUND IT --- to me this looks like a pretty sweet setup.

http://www.dartauto.com/projects/2013/8/20/spec-boxster-accusump-and-transmission-oil-cooler/


Mike

[Topless]

RE: oil cooler setup

Have a look a McDuff's ext. cooler in the rear trunk. It may be overkill but data on temps and pressures looked really good at Chuckie last month in 95F ambient. I was pretty impressed with his results. Not sure if his setup meets current BSR rules though.

Meanwhile another accusump-equipped car developed rod knock. Accusump looks like it is batting about 220 so far this season.

[stephen wilson]

I think a Accusump quickly runs out of oil under sustained cornering/oil starvation. Isn't the best solution (and the most money) still adding a scavange pump to the other cylinder bank, in addition to a deep baffled sump and extended pickup ? A water/oil heat exchanger would also be a great idea.

[seningen]

Originally Posted by stephen wilson

I think a Accusump quickly runs out of oil under sustained cornering/oil starvation. Isn't the best solution (and the most money) still adding a scavange pump to the other cylinder bank, in addition to a deep baffled sump and extended pickup ? A water/oil heat exchanger would also be a great idea.

What is the pumping rate of the oil pump? Accusump typically has 3 qts under
about 60psi.

I wonder if the pickup sucks air -- which drops the pressure -- but now you
are shipping around aerated oil as well as your pressure drop?

I wonder if there is something to temperature, aeration, and oil starvation
that comes into play at the same time.

Mike

[thstone]

Originally Posted by Topless

RE: oil cooler setup

Have a look a McDuff's ext. cooler in the rear trunk. It may be overkill but data on temps and pressures looked really good at Chuckie last month in 95F ambient. I was pretty impressed with his results. Not sure if his setup meets current BSR rules though.

Meanwhile another accusump-equipped car developed rod knock. Accusump looks like it is batting about 220 so far this season.

Yes, I've seen Chris's trunk mounted cooler. That thing blows like a ... uh, tornado. Unfortunately, not legal for BSR/SPB.