Oil surge: R400 Duratec with wet sump

It runs up the left side of the block on right hand turns.

quote:It runs up the left side of the block on right hand turns

The definition of surge Willie

It's not that simple Willie. The Raceline sump is very well baffled and has a plate on top of the chambers in the sump and which has (now) 3 holes in it to let the oil back to these chambers and the oil pickup. Two of these holes are roughly on the centre line of the crank and the third one is slightly offset to one side. When cornering the oil will, for a time, sit above the plate as it is being forced over to one side or the other, being unable to flow back through the drain holes. As mic says, on right handers the oil will run up the side of the block to where the crankcase breather is sited and from there will be sucked into the inlet plenum via the breather pipe, thus causing the smoke. In a straight line, the oil should, in theory, be able to drain back through the 3 drainage holes into the chambers below and thus to the oil pickup. Brent (aka Arfur Nayo) Toyota power It's the future!

So what's complicated about that? As an engineer, what would you recommend to fix it? Willie

Why should I need to recommend anything, CC already have a fix for it. No point reinventing the wheel. Brent (aka Arfur Nayo) Toyota power It's the future!

I believe it is John, yes. When I had this same sump on my Duratec, I did what others have suggested on here and routed the crankcase breather to a catch tank. I had DTH throttle bodies anyway so the question of running the breather to the inlet never arose. Latterly I had a dry sump and so the crankcase breather was blanked off. Brent (aka Arfur Nayo) Toyota power It's the future! Edited by - Brent Chiswick on 3 Dec 2008 18:23:21

Hope you get it sorted John. Brent, I always re-invent the wheel, its the only way you learn stuff. Especially if the normal "fix" is to cover up the symptoms rather than curing the fault. Willie