Originally Posted by North Coast Cab

Vaughan,
I see the remote filter housing and sandwich plates, but what caps off the existing filter location? I run a sandwich plate now for an external oi lcooler, but I still need the stock filter to cap it off. Maybe I'm missing something.

Originally Posted by Chris White

Let see if I can cover the questions about the Accusump in one post…

First off it is important to understand a couple of things –
1) at stock ‘max’ oil level (by dipstick mark) the oil level is with in an inch of the crank (top of the lower sump).
2) The reason for the rod bearing failure has nothing to do with the pick up being uncovered – this is not possible unless you run well over two quarts low. I was at the Glen earlier this year and checked on a 944 stock class race car that was next to me in the garage – no oil showing on the dipstick after a track session. Rod bearing did not destruct.
3) The ‘real’ reason for the rod bearing issue is the 90 degree ‘bend’ in the crankshaft oil drilling. This causes a severe flow problem along with a starvation due to centrifugal forces issue.
4) Aerating of the oil due to contact with the crank will aggravate item number 3, and you can’t prevent this unless you go to a dry sump system. Under braking (at least track braking at 1G) half of the oil in the pan will flow to the front on the engine – where there is only about ½” of clearance between the crank and the pan. At this point you are making Oil Margaritas!

The Accusump is a passive device that injects additional oil when a drop in pressure is sensed – it typically comes precharged to dump oil when the pressure drops below 40 psi. So when ever you drop below 40 psi it will add oil….for more Oil Margaritas!
As some folks have mentioned they lowered this precharge to 5-6 psi – I will give them credit for thinking of this but it won’t help the rod bearing issue – to defeat the starvation issue you need to keep the oil pressure as high as possible and the aeration as little as possible – adding oil at 5 psi will not help (it doesn’t really hurt either – once your engine is at 5 psi while out on the track you are toast anyway…)

The electronic valve is not an intelligent device – it is simply a remote on/off valve, it will not help the issue – but it does make for a nice preoiler.

So, I will agree that if you reduce the precharge of the accusump you are not doing any harm….but no good either. In worst case it just means that you will dump an extra 3 quarts of oil on the track if the engine blows!

And for those that don’t change the precharge level – your crank will hitting the oil anytime you are under 40 psi….Oil Margarits for all!

Chris White

Originally Posted by Chris White

The problem with the 944 oiling system is aeration of the oil. Basically the oil gets whipped up in to a froth by the crank. Oil foam is not a good lubricant.
The oil level in the pan of a 944 is within ½” of the crank, now add in a little lateral force or braking force and the oil hits the crank. Oddly enough the popular Accusump fix will only make this worse as it dumps a couple of extra quarts in to the sump at hot idle.
Dry sumping is the only ‘real’ fix and a done correctly figure a starting costs of $3 to 4k. Of course you could get fancy and spend a bunch more….

Originally Posted by 924RACR

Very interesting, Daigo!!!

From what I've seen, the Milledge unit is a C-M unit with the appropriate stuff for a 944.