slate blue

This is how BMW do it.

john gill

Thinking about experimenting with a scavenge pump such as this http://www.rbracing-rsr.com/oilsystems.htm anyone having the same thoughts , as I sure that the predominant problem is the rocker cavity acting like the sump should .
As I expect that I cannot find a good compromise to install the dry sump system and keep all the nice stock features this may be part solution .

I forgot to also mention when I spent all the hours in the dyno I would also find that when the engine speed was high that oil would weep down the sides of the heads from the gasket side over the headers . THis would suggest that oil is being forced in there under pressure .
THe pump could be activated by the ecu at over 60 % throttle which is configurable in my ecu .

hairywithit

could you rejig the two vents on each cam cover?
the aft one between 3&4 connects to a pipe that picks up oil from down low between the exhaust valves.
the forward one between 1&2 connects to a pipe that seals to the front-most oil galley - should be a straight shot into the sump

Cheburator

Quote:
Four oil pumps provide the engine with lubricating oil. During extreme cornering, centrifugal forces push the engine oil to the cylinder bank facing the outside of the bend, thereby preventing the natural return of oil from the cylinder head, which might lead to inadequate oil supply in the sump. Should the worst happen, the oil pump could suck air. To prevent this situation, the engine features a transverse force regulated oil supply system. This system incorporates two electrically-operated duo-centric pumps which pick up oil from the outer cylinder head and transport it to the main oil sump if lateral acceleration exceeds 0.6 g. A lateral-g sensor transmits signals to the pumps.

Yet the V8 S62 and the S54 (the Inline 6, which has an oil pump with dual pick up) suffer from oil starvation unless dry sumped when raced hard. There is no escaping the fact...

One of my cam covers is completely plugged, the factory filler hole is blanked off and the other cam cover vents into a catch tank. No oil in the catch tank at all even after high rpm on track.

However, plugging all ventilation on the block and heads led to crank pressurization and the dry sump scavenge pump being overwhelmed as I blew the dipstick.

Since then the dip stick has been removed, the hole plugged and one of the cam covers vented.

I will look into adding a 3d stage to my pace product scavenge pump, which will scavenge the heads via two hoses joined with a common T...

killav

I remember reading somewhere that the WOT feeds a signal to both the LH and EZK (87 model) but the EZK one is not used, and can be used to trigger another relay which can perform another function, like turn on an external oil pump at high RPM......a metal tube can be easily fabricated to snake down to the lowest point in one or both cylinder heads. Tie this tube into the factory breather elbow, and then connect the breather hose to the pump mounted on the fire wall or shock tower or other suitable spot. Plumb the outlet of the pump down to the factory block off plate on the oil pan, on an 87 anyway, which would require drilling and adding a fitting.

928mac

John Speake

The WOT switch is used on the EZK for a seperate WOT map, but when Sharktuning this is usually "ignored" in software to allow more flexibility on tuning.

However there's no reason to use the WOT signal direct from the WOT switch for your idea, it is at 12v when not WOT, the WOT switch grounds it when activated. Any circuitry added to process the signal should be reasonably high impedance.

IcemanG17

Maybe there is some "secrets" to the Devek engines that Marc never made public..... There was Devek strokers that blew...but I think Hanson's only blew after he took out the oil coolers and dumped all the oil....

GregBBRD

No doubt. We've all got engine secrets that we never tell anyone...very few of us are here to teach the world how to do the things that we've spend many years and lots of effort to learn.

I've always had an interesting observation about people telling "secrets". It seems that the less someone knows about a subject, the less you are likely to "get" from them.

IcemanG17

For sure......no matter how much a single person may know about any topic...there always is someone out there that knows more.....it is good to be humble!!!!

I'm lucky that I know just about zero about engine building...but I do know who to ask (but will they tell me?)

depami

This is a very interesting thread. You people seem to be deep into this.

But, I have a question.

When I hold my 86.5 auto wide open for two minutes, how close am I to self destruction?

928mac

2 Minutes! holy dyna you are cooking at 2 minutes.
I think at 2 minutes I have been at 160 mph for 1 minute ha ha

Sorry just razing ya.

Ummm I think it depends on the car and if you are going in a straight line.

Some of the guys here may have some actual test results they will share.

blown 87

I have held a 928 at WOT for at least 2 mintues, finally got it to start.

depami

You are correct, that comes in around a minute. And, it's still pulling at two minutes. You cover a LOT of ground in that time. Straight roads though. But, maybe I souldn't do that any more.

GregBBRD

In more ways than one.