924Board.org

peterld · Posted: Fri Jul 16, 2021 10:37 pm Post subject:

Guys...thank you for your detailed explanations. Seems like a truly wonderous thing you have there. Something not seen over here, or at least not commonly.
I'm familiar with full-on dry sump arrangements, but this seems to be a half-way house with far simpler operation (and cost).
Obviously there must be an air line fitting on the other side?
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80/81 932/8 ROW

MikeJinCO · Posted: Fri Jul 16, 2021 10:43 pm Post subject:

The location would probably work. Be sure to look at all the hoses available, the typical SS wrap Earls Permaflex type hose is very stiff and takes fittings to get around turns. There are are other hoses that might be much more flexible. Costs for fittings can easily be much higher than a for a premium hose. I use a manual valve also, with that location an electric one would probably be required(but then the car is usable on the street also). Fragola makes a fitting that puts a 1/8" pipe pressure/temperature gauge port in a -10 line.

There is typically a pressure guage and air charge fitting on one end of the tank and the outlet on the other. Moroso makes them as well as Canton Accusump.

Prototype the setup with even some old garden water hose and some plastic sewer pipe before buying much stuff-a lesson learned the hard way.

I charge the tank air with a bicycle pump, If not a one time deal, than a tank rebuild is required.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)

peterld · Posted: Fri Jul 16, 2021 11:38 pm Post subject:

Thanks Mike...wow some food for thought there. Now for some research.
Thanks again.
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80/81 932/8 ROW

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2595 Location: MI

924RACR · Posted: Sat Jul 17, 2021 3:18 am Post subject:

I rev it only while filling; once settled, and back at idle, I'll close the valve before engine shutoff, so the accusump is full of oil at idle pressure.

So when we shut it down hot, there'll be more oil in the engine; after it cools post-race, we restart it, refill the accusump, shut the accusump valve, engine off, 5 min to settle then check oil level.

The oil level certainly will move around depending on temp and revs.

Total capacity is indeed 2 gallons (8 quarts) - don't forget the cooler and oversize remote filter.

At speed - we have enough oil. Don't forget that, in operation (4000-6000rpm) there's also a good bit of oil in circulation around the engine, up in the head and still in the process of draining down.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Fifty50Plus · Posted: Sat Jul 17, 2021 5:33 am Post subject:

To keep the engine oil level about correct, I turn the manual valve on my Accusump off when the engine is about 3000 and 65-75 lbs on the cool off lap.
I also fill the engine about 1/2 quart over the full mark on the dipstick when the Accusump is full and the valve closed. As Vaughan says there is a bunch of oil slopping around the engine before it drains back into the sump when it is on the track.
I also forgot the mention that the initial air charge on the Accusump is about 5-10 pounds before it is first filled with oil. The oil pressure pushes the piston back and the pressure gauge is actually measuring the air pressure in the Accusump which is approximately the same as the oil side of the piston.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA