I have a Problem - Engine Oil
We have just completed an event in France which turned out to be very, very difficult.
In fact the hardest event we have ever done.
On some sections the vehicle was almost vertical for long periods, with the
front facing up some times and facing down at other times (and occasionally level!)
Our engine (Mercedes V8 type 113.96 same as G500) is in the rear of the car.
With the front upwards we have no problems.
When the front is downward (vertically) after a few minutes we start sending smoke signals out of both exhausts and
then the engine stops as all 16 plugs get oiled up, Engine will not restart for about 15 minutes.
The oil in the crank case runs though the breather pipes into the inlet manifold.
Anyone have any suggestions?
One member has sugested Dry Sumping the engine, which is quite a major challenge.
Re route vent pipes so they do not go into inlet manifold but into a catcher can .. probably as near middle of engine as you can get.
From catcher can have 1 or 2 drain lines going back to sump.. one going down and forward, one going down and back. When the catcher can fills up.. it will then drain back to sump. As you only have issue in one direction.. you actually only need one drain line. Vent catcher can to atmosphere.. but have option to put back to inlet manifold for MOT. Maybe do not want an external vent so optional
But did you win ?
Hello Tony,
I agree with the first suggestion of dry 'sumping' and using scavenging pumps to transfer oil.
You could possibly, introduce one way valves into the breather system, so when the engine is at an incline, the ball inside the breather will fall by gravity and help seal off any oil traveling further up the breather fowling the induction system. One may try a heat range up, of spark plugs to help burn off some oil fouling, but this is very much dependent upon the amount of oil fouling.
Looking at the EPC; my estimation, at present is of the oil fouling is from the rocker covers via the breathers.
Could you tell; if, there a tendency of oil fouling from driving horizontally to front end incline is greater or lesser or indifferent, to having done a rear end incline first, moving to a front end incline? Hope you understand.
Cheers,
Hello Tony,
I would like to ask, if you could post some photos of the rocker covers please.
I now think, that you can do away with the dry sump, although I feel it could be ideal to have, but more immediately, the reason you are not getting any oil fouling when in a rear end incline is that the oil in the rocker covers drain out of the rocker due to an excellent outlet, the timing chain chamber, but when in a forward incline, the oil collects at the back of the rockers.
Looking at the engine from crankshaft pulley, backwards, the left bank of the rocker has two breather hoses, one mounted approximately, mid way of the rocker and the second more towards the rear, almost three quarter of the way down; this hose is lower compared to the first hence the most likely point from which oil could ingress into the induction system.
You could resolve this by piping in, a drain hose from the rear end of the rocker and have that somehow drain into the block, alternatively, the breather hose could have a reservoir to collect over spill of oil in a deep chamber of sorts, but the breather hose to suck vapor from a higher point of the oil collector, when viewed as the engine is in incline. I will try and draw a diagram out to show what I mean.
Cheers,
Hello Tony,
Not heard anything from you; what are your findings or resolve?
Nosey individual itching to know,
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