nik77356 wrote:Some issues I discovered after switching to slicks, is that oil pools up in the cylinder head in those same left hand turns. This causes the oil to get sucked through the intake and burned, causing a massive smoke screen for the people behind you. After discussing this with several members here, the solution is to tap the oiling holes in the block that go to the cylinder head and install set screws that are drilled all the way through as a restrictor. This will help in two ways; It will keep oil in the sump, as well as keep oil from pooling in the cylinder head.
By reducing and draining the oil from your valve train you are
reducing the oil lubrication with potential of making the valve
train to run dry. To my understanding you are trying to drill holes
on the exhaust side so that way the oil will drop in the back
of the block and then back to the pan, absolute no.
I would suggest something, think of S38. The S38 valve train has
even more oil than the M30 because of extra cam and also extra
12 friction pieces which needs lubrication, so how come S38 does
not have such a problem ?
Study the M30 ventilation system, flip your valve cover and note
from were the oil is getting sucked via the valve cover pipe and
then direct to the Intake, the screen is very very very very small
and not insulated to prevent the oil from getting to the intake
valve cover pipe.
Compare the M30 valve cover to S38. Note how on S38 you have
a very very long solid screen/wall and this prevents the oil to
splash and hit the valve cover vent hole. Second, note how the
valve cover casting is looped even with harshest race conditions
the oil will never ever reach the valve cover vent hole, unless you
put the car on the roof and have the engine to operate then the
oil will get into the intake via the valve cover vent pipe for sure,
but in this case we have a lot bigger problems than puff of smoke...
So what you can try is measure the plate that is on the OEM,
get 2 more plates from another M30 valve covers and put them next
to each other TIG welded so to get rid of absolute any holes of were
the oil will get near by the valve cover vent pipe to Intake.
Block any side access which the oil will have a slim chance to
get inside. Remember the vent opening hole is about 20mm so take
that ~20mm and measure total opening area and complete close the
rest and box that area.
With higher springs pressure and more aggressive camshaft you
need oil in your valve train. Also remember on the track under
hard braking with slicks as you do have the oil is splashing like a
tsunami towards the front of the engine were massive amount of
oil is pushed down from the front timing chain cover. So imagine every
corner how much oil you drain via the front. Reducing the oil in
the valve train you are making it for the worst. Open the oil cap
on S38 and see the exhaust cam nearly dipped in oil, and that's on
Idle speed of 850+/-,imagine at 7500-8000rpm and ~ 4-Bar oil pressure
how much oil is splashing the valve train up there...and no issues with
Note your path, you never had issues up until you put slick because
now the oil is reaching the valve cover pipe and dumps oil inside
of the intake which pollutes the cyl chamber.
try to you will see how easy is to fix this problem. Hopefully, you
don't have biow by from worn out piston rings ?, also your guides
should be tight and nice without any play, then no problems.
Regarding the oil in the pan during race ? what you can test is
on the morning when the engine is cold start and the oil pressure is
very very hi run the motor and rev it to say 3-4k rpm then while under
revs check the oil level and see how much oil is missing form the oil
pan, take notes. I assume the valve train would not take much more
than 500ml meaning half a liter. Add that 500ml on top of the the max
level of your dipstick and you are good to go.
On my E24M6 race car I do have a mechanical pressure gauge and no
matter how many G's I pull my oil pressure is frozen at 4.2Bars on
hot day, but I have modified the oil pan which holds 9 liters of oil
but the same time does not interfere my knife edge crankshaft at all.
Hope this helps a bit.