Accusump Installed this weekend...

[insite]

chris -

a better route is to use a catch tank similar to this:
http://www.summitracing.com/parts/CTR-80-206/

route the outlet from the oil separator to the tank & block off the inlet at the throttle. much cheaper & a failsafe solution.

shoot me a message when you get ready to do your accusump (save $$$)

Originally Posted by ChrisZang

Bonus question, and no pun intended here, as I am just considering this as my next mod to get ready for the track season.
So if anyone pulls such high G that he's running into oil starvation problems shouldn't the next mod be the Motorsport AOS, see this thread:
http://www.renntech.org/forums/index.php/topic/21641-will-a-motorsports-aos-work-on-a-boxster.

[jaykay]

Ouch, are we saying that long sweeping rights will develop high enough g loading on ps2s (as in without slicks)? What sustained g loading threshold are we talking about? I might just put my i-phone up on my dash and set an alarm

[insite]

Originally Posted by jaykay

Ouch, are we saying that long sweeping rights will develop high enough g loading on ps2s (as in without slicks)? What sustained g loading threshold are we talking about? I might just put my i-phone up on my dash and set an alarm

exactly right. something slightly less than 1G can cavitate the sump over several sustained seconds. the oil pools in the head AWAY from the scavenge pump & causes a starvation issue at the pickup tube. this is MOST common with left handers in a boxster (right handers in a 996), but depending upon forward accel / decel, this can hapen in either direction. slicks exacerbate the problem, but it DOES exhist even on street tires.

porsche rectifies this for racing customers with its 'motorsport' upgrade, which is basically the same as the X51 oiling mod. they replace the scavenge pumps with versions that have exterior as well as interior inlets. a tube is run from the OUTSIDE of the scavenge pumps, across the valve covers, and to the other side of the motor. this way, the scavenge pumps can draw oil from either side of the motor. they also add the deeper sump w/ a bit higher oil capacity for good measure. some people modify the baffles as well.

at any rate, all of the above is pretty pricey and still leaves the door to other oiling related failures WIDE open. the accusump pretty much eliminates those problems.

i think the accusump coupled with the 3rd radiator kit & the 'S' oil cooler will get you about as close to dead reliable as this motor can be without cracking it open.

[insite]

here are some photos from chad996's (rennlist) car. note the X51 scavenge pump in the first photo & the gold foil wrapped hard line to the other side of the ead in the other photo:

[jaykay]

Okay thanks for this comprehensive response. I don't know how the oil system is arranged but from what you are saying oil pooling the opposing head initiates the problem and not sump sloshing. If this correct, a deep sump won't help if oil is trapped in the head. Is this correct?

[insite]

Originally Posted by jaykay

Okay thanks for this comprehensive response. I don't know how the oil system is arranged but from what you are saying oil pooling the opposing head initiates the problem and not sump sloshing. If this correct, a deep sump won't help if oil is trapped in the head. Is this correct?

exactly. the issue is that the sump can run out of oil. sloshing probably exacerbates this. the deep sump kits w/ an extended pickup tube can help to an extent (as can modified baffles), but the problem can still occur.

[ekam]

Just an FYI to those who just want to get the deep sump spacer, X51 oil pan is much better designed than the stock pan, check the photos on this rennlist post below.

http://forums.rennlist.com/rennforums/6663161-post10.html

[Mike_Yi]

Originally Posted by jaykay

Ouch, are we saying that long sweeping rights will develop high enough g loading on ps2s (as in without slicks)? What sustained g loading threshold are we talking about? I might just put my i-phone up on my dash and set an alarm

It happened to my engine at Road America on Goodyear Eagle F1 Asymmetrics (which are rated slightly better than PS2s, but probably not enough to make a difference). I had done several track days on other tracks before with no problem. However, RA has so many really high speed corners that it imposes much more G than tighter tracks with slower speed corners. Add to that the Carousel....