What year oil tank has baffles?

[scca_ita]

Looking for a tank that would work for racing.

[rattlsnak]

The tanks hold so much oil that baffling really isnt required for even the factory race cars.

[Jack Olsen]

Corvettes and 996s need baffling. Dry sump systems don't.

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Jack Olsen
My Rennlist page • My Pelican Gallery page • My Porsche Owners Gallery page

[speeder]

Jack is correctomundo, whole purpose of dry-sump is constant oil pressure in turns.

[dad911]

My 71 911 would lose oil pressure in hard left corners at track events. At first I thought it was engine/oil pump, but second engine did same thing. Problem went away when I switched to a '74 oil tank.

[KTL]

If the tanks don't need baffling, what's SmartRacing selling below?

http://www.smartracingproducts.com/ProdCat/Oil%20Systems/oilsystems.htm

Just asking since I don't know the answer.


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Kevin
87 Carrera coupe

[scca_ita]

I have also heard that under braking the oil can slosh forward from the feed and cause damage to the engine. I have heard the 89 911 tanks were the first to be baffled. I am tring to confirm this.

Originally posted by dad911:
My 71 911 would lose oil pressure in hard left corners at track events. At first I thought it was engine/oil pump, but second engine did same thing. Problem went away when I switched to a '74 oil tank.

[Rich911E]

Depending on the g-forces you are intending to generate, the oil tank should have some baffling to prevent oil sloshing around. Violent turns or spins should not result in a ton of oil being sloshed out of the top.
Almost more important than the oil sloshing is the de-aerating the oil. The oil should enter the oil tank on a tangent and have an air/oil seperator device.

The factory oil tank is probably not up to the job of a pure race car. You might look in the Carroll Smith books (Tune to Win, Prepare to Win) for the proper design of a dry sump tank. Probably installing the oil tank in the trunk is the best -- it can be tall enought to do allow air/oil seperation and more quantity than the factory system and for a race car you will most likely have a front mounted oil cooler anyhow. Plus it puts weight out front to help balance the car. Here is a picture I found on the net somewhere of a really nice install.



Rich

PS (Porsche Snobs) -- all racing cars, whether they are European, American or Japanese, have dry sump systems -- even the roundy-rounders. Most of them have nice multi-stage external dry sump pumps that are better than the 911 internal pumps. If you don't have a dry sump system, it's because the rules don't allow it.