Paul 996

Per the title, researching the parts needed to install an Accusump Oil accumulator to mitigate observed oil pressure drops at the track this past weekend.

Once the track started drying up I was seeing oil pressure in sustained left handers drop from 5bar down to 2-3ish as far as I could tell from quickly looking back and forth (still needed to keep my eyes on where the car was going). Also felt/heard a power loss coming out of one specific corner. This is an oddball counter clockwise course...may not go back too much with the 996.

If anyone has done this on a 996/997/boxster and knows the source for the Oil filter adapter please share. Thanks!

-Paul

AudiOn19s

What track???...so I can stay away!

Vlocity

Try this page.......http://www.cantonracingproducts.com/...ump_input.html

Dropping oil pressure can be very distracting.

Regards,

Ken

Paul 996

Summit Point's Shenandoah circuit not the main circuit, that one is fine...no long sustained left handers there all quick lefts.

Right now my thinking is that an Accusump is a quick cheap fix which has been used forever on street derived cars being developed into track cars.


Converting to a dry sump is usually pretty straightforward put I am still learning about it and the 996's integrated dry sump thing throws me a few curve *****... I totally see how you do it on the Chevy LS1s and even the S2000 from looking at their kits. I just can't line up all the parts in my head for where they fit on our engines. Also, a dry sump is a bit pricey (could easily run close to $3-4k) and would have to fab a lot of it myself as their are no off the shelf kits (hello Chad? j/k)..

Accusump makes the most sense since it will readily solve any oil surge/starvation in the stock systems.

Paul 996

Thanks I knew about that page... but I don't know which one of those may work with our cars.

David A

The X51 oil pan helps, it did on mine. You can get it from www.suncoastporsche.com in FL.

AudiOn19s

He's alredy got the X51 pan...that's the scarry part.

Paul: If you don't mind me asking...can you define a "long left hander". I run Nelson all the time and it's got a banked 140 degree left hander and now that you mention this it kinda scares me that I've never checked the pressure in that turn.

Andy

David A

Paul where did you install the tank for the Accusump ?

Mfletch

Paul, the accusump sounds like a great solution to your problem. Does it allow you to pressurize the system prior to starting the car? The noises that our cars make when they are started, after sitting for a day or more, always stress me out. Please keep us posted.

Paul 996

This is the course in question... I know of 3 M96 motors that died on it personally... mine being one.. sniff.

It runs counter clockwise which is the major contributing factor imho.

This is fun course in that all the apex with the exception of one can be summarized as being late and blind... as in you never see them.. so very much a technical track.

Starting with turns 3,4,5 that is a constant steering input, mid to high g, steady throttle...blind downhill drop out of 5 followed by a full throttle blast to 8 ( a little oil pressure drop here but since you hesitate coming out of 5 before being full on the gas it stabilized.

Turn 10 is a high banked corner.. think Nascar.. definite oil pressure drop here and draw a straight line from 11 to the braking for 14 cause that is what it is.

Now the 1st prob area... exit of 14 is the real beginning of the straight and is all sustained left hand high g..

The last and most serious problem area is the 180 degree turn 17.. Major oil pressure drop observed here at maybe 75-80% which is worrisome. Here is where I noticed a slight power drop accelerating out of the corner also with a slight engine tone change (real easy to hear things like that when you run straight pipes the 1st time).

Paul 996

Mark, yes it would pre oil that is what some folks use it for exclusively.

Paul 996

OK.. so nevermind this. Accusump won't be the way I go for now...

Just remember our oil scavenge pumps in the heads are in the drivers front cylinder and in the passenger rear cylinder. So heavy heavy braking followed by an immediate sustained G left hander is no good.. Oil pools in the right front cylinder head causing the oil pickup in the sump to suck air. Ref corner 17 above.