Carl Fausett

Canton - its a real asset to have the manufacturer on this thread to clarify and answer questions. Thank you.

As to volume: My 3 qt Accusump seems to hold about 2.4 qts of motor oil in the system when fully charged, the rest is the piston and the pneumatic area. Canton - please make this more accurate if I am off.

Also on the topic of how much oil the system will hold - - one variable has to do with where you mount the oil accumulator. I have seen them mounted in the rear bumper (long lines) and in the passenger foot-well (short lines) = different system volumes. The net is the same, however. It is only the volume of the pneumatic piston's swept area that gets transferred to the engine.

PekkaV

My racecar version

All oil go true Oilfilter => Oilcooler => Engine

Accusump place low, between axels ( FIA rools, no oil in cockpit, => see accusump shield right side of accusump, so it can be in that place. )
note: oneway valve after oilfilter => when Accusump work, oil go only "right way" to engine

Vilhuer

Pekka. I trust you collect all needed Accusump info from this and other threads so I don't have to.

BC

Going to need a thread on that racecar.

Welded joints for K member
Bearing joints for upper a-arms
Alot of Plumbing.

Canton Racing

Forgive me if I confuse part of this issue. I am running the questions by our Accusump tech guy as well to make sure my understanding is correct. When you see a pressure drop in the system it will be a drop across the whole system so while the pressure drop may be caused by the pump you will see the pressure drop at the EPC switch almost immediately. It was explained to me as a garden hose analogy. If you pinch the line in the garden hose close to the faucet, water will almost instantly stop coming out of the line because there is not pressure pushing the oil through anymore. Once you let the hose go it will almost instantly start coming out again.

Canton Racing

The amount of oil is ultimately based off of how high the pressure in your system is. The higher the pressure the more it will compress the air side of the Accusump and the more it volume in the oil side it will open up. In the case of mounting the Accusump further away you are correct. There will be a pressure drop just because of the friction in the lines so you will see less oil in the Accusump but not very much.

Carl Fausett

Here are a couple pics on where we placed the oil accumulator and plumbed it.

I wish it was lower, but it is very well protected and it keeps the lines short. I valued that above mounting it lower in this case.

I'm not a fan of the rear bumper mounting because of the long runs (braided oil lines are heavy) and how often a race car gets bumped in the rear. I'd hate to have my oil accumulator dump all over the race track! That location also adds weight way out on the polar axis, creating an undesirable higher moment of polar inertia. Mass hung outside the wheel base is especially undesirable.

Seen some nice installs in the passenger compartment, but that's not for me, either. FIA rules wont allow it, and getting sprayed with hot oil is not on my wish list. But it is low and very near the polar axis. Best for the car, not the driver.

So we put it in the cowl. If it leaks, it drops out the cowl drain (I had that happen once when the pressure sender blew a seam), and it's on the other side of the firewall from the driver. It is protected from all but the hardest impacts, and at least closer to the polar axis of the car. It can be said it's higher than the other mounting locations - so not optimum for CG, and I would agree. Note the remote-mounted pressure gauge. It is plumbed to the pneumatic side of the Accusump. We like that the mechanic standing over the motor can see the pressure as the driver starts the engine. Handy.

Here are some pics.

Carl Fausett

I just noticed the pics above do not show the EPV. They are from about 2004, and pre-date the upgrade to the EPV when it came out. But - it is in the same place today with the EPV installed.

PekkaV

General comment of accusump.

I am part of Finnish Top Fuel team, TIL-Racing, and we have tested "homemade"accusump in my fried Timo`s TOP Fuel dragster ( DrySump engine, about 8000 hp ), and we love it.
Without accusump, after round, rod bearings dont look like bearing , but when we used Accusump, they look almoust "brand new".
We rebuild engine after every round, so we now, what we are talking.

ps. we do not use Amsoil !!

Yellow car, right lane



ps. if you dont like my comment, please take it away

Carl Fausett

Pekka wrote me to add that once he made a shield to cover the Accusump, then the FIA inspectors were OK with it being in the car. You can see the shield in his post #32 above.

PekkaV

for that Adams question

my friend ( not Erkka / Arnaud ) have 928 GTS, street car, but he has update brakes, 6 piston Brembos front, and 4 piston rear and use semisliks.

He spend 10-20 days per summer for track , and drive fast, and he say, that he can see, from his pressure gauge, when Accusump do that work ( long , hard corners ), and he know, that without that, he has would have destroyed his engines bearings, and maybe more.

He use same Canton Accusump than me, but is installed front of radiator.

Vilhuer

And not just any old brakes. Actual carbon fiber disks.

Carl Fausett

Another item that may help you - I do have a downloadable installation guide for an Accusump in a 928.

Go here: http://www.928motorsports.com/install.php

And download the "3 Qt Accusump Kit" from the Performance and Competition Products section.

I think if nothing else, the pictures may help you.

mark kibort

impressive. in a 3 second racing engine, you probably use Wesson oil!

atb

I am currently mounting the accusump into the cowl area of my track car.
I recall reading that the canister would work in any orientation. I'm reading through the instructions which state that it's preferable to mount the canister at an angle so the oil side is higher than the air side so that air bubbles don't form in the canister. This would be difficult for me as everything is set up for the canister to be level.
Everyone's installation pics appear to be level. Any comment on whether this is an issue where level mounting was used?
Also, the direction state that the canister should mounted to a plate if bolted to body sheet metal, doesn't look like anyone did this. No issues?