Accusump

[chorton_1]

You have to be careful with dual pickups because otherwise you just pick up a load of air from one pickup and the airated oil causes bearing trouble anyway. What you normally try to do is trap enough oil in one area (using flap valves and the like) that that there is sufficient resevoir for prolonged cornering. An Accusump is an extension of this, that when paired with a baffled sump works quite well. Alternatively, you can use a pure baffle that just slows the rate of transfer across the sump, but of course this isn't as good (although much better than nothing).

 

Dry sumps are obviously the best because rather than a long flat engine sump, a dry sump usually uses a nice thin and tall tank which limits the effects of high G cornering, however oil starvation is still an issue (e.g. there's a particular crest on a corner at Elkhart Lake in the US that causes a problem, as well as a point in Spa). Ovals aren't a problem because they are steady state and you know the direction of the corner and the likely lateral G.

WRONG ( well partly)

An accusump is extra oil stored at oil pump pressure, it is an accumulator filled by the pump so when there are surges it replaces oil that the pump cant supply,they are usually installed straight into the oil gallery at a convenient point, the oil pump pushes a piston back against a precharge air chamber, as soon as the pressure in the engine drops the air pressure pushes the piston back and the oil back into the engine.

Most of my competition cars are dry sumped but i did have a honda blackird powered car that had terrible surge probs that were cured by an accusump.

If you cant dry sump the engine then its the next best alternative

 

Yep you are right! It was, I admit, a simplification on my part. The point I was trying to make is that both an Accusump and the baffled sump only delay the onset of transient problems - they both act as methods of temporarilly storing oil (the baffled sump at low pressure collecting oil at the pump inlet and the Accusump, as you correctly state, at high pressure post-pump). However, as a sweeping generalisation, the dry sump system can run indefinitely under a wider range of conditions due in part to the taller thinner shape of the oil tank, which will keep supplying oil direct to the pump inlet.

[dobbo]

For the K, Eliseparts sell a windage plate - sits in the sump and just a metal sheet with some holes in it. £40 for the low-tech solution, for anyone who can do their own oil change and owns a torque wrench.

 

... and are happy to remove the exhaust manifold as well, which might destroy the lambda sensor and the threaded hole it's in