Tomei Oil restrictor

[Dragster33]

Just wondering if the restrictor would still be needed in the case of 7L sump using a JUN oil pump in a RB30/26 combo with a 800hp turbo, my thoughts would be that it wouldn't hurt having a bit of oil in the head in this combination as its not going to run out of oil? but I may be wrong

[Duncan]

I take it this is for a drag car? I wasn't aware of oil surge problems in straight line cars?

In a circuit car a combination of too much oil in the head and high lateral gs are what can cause problems

[Dragster33]

But doesn't it cause problems due to it leading to oil starvation, having such a large capacity sump ould fix this wouldn't it?

[Dragster33]

I guess what I mean is whats the use in having such a high pressure high flowing oil pump with a huge sump if your only going to restrict it?

[Sydneykid]

I guess what I mean is whats the use in having such a high pressure high flowing oil pump with a huge sump if your only going to restrict it?

The hi oil flow and pressure are for the main and big end bearings, not filling up the cam covers with oil. The restrictor sits between the head and the block, so it limits flow to the head, but leaves the bottom end to get full flow.

Too much oil in the cam covers usally means not enough oil in the sump. It can also mean excessive oil into the catch can. I have seen a drag RB fill a 2 litre catch can by 1/2 track, makes an oily mess of everything.

You get oil surge front to rear in a drag car sump, so it needs to be designed to control that. Otherwise you can end up with the oil building up at the rear of the sump during a run and then the crank hits it, bad for power and crank life.