atlhesi

Hello,

I have a strange oiling problem with my forged 418 stroker engine and an e-force supercharger
The mileage of this engine is about 5000 miles.

The spark plugs at cylinder 3 & 6 are oil fouled and the engine uses 5 quarts
oil for 1000 miles.

I removed the cylinder heads and I saw a lot of oil in the intake before the valves
at cylinder 3 & 6. Also the valves and the valve guides were covered with oil.
Therefore and because of the reason that the cylinder heads were affected from
A former engine failure I exchanged the cylinder heads .
The pistons and the cylinder walls – just from a top view seems to be OK.

But now after changing the cylinder heads I still have the same oiling problem
at cylinder 3 & 6 are oil fouled spark plugs .

I guess now the oil rings are the problem. But just at 2 cylinders ? And at a relatively new engine with
only 5000miles from a well-known US engine builder ?

Or could other reasons causing my problem ? Because I had from the start with the new engine
Sometimes misfire (the engine light was sometime light flickering ).
Or could a bend reluctor or small ECU damage the reason that sometimes the 2 cylinders are not working
properly and the engine is pumping oil there.


best regards from Austria in Europe

Heinz

dw456post

If the e-force is like the Magnuson, the valley plate is changed and you lose the PCV baffle. Usually they recommend running a hose from the ds valve cover, back to the front of the blower. If you don't have a catch can, this setup sucks a lot of oil into the intake right into the cylinders. This is a bad spot to pull vacuum. There is a lot of oil splashing around this area. The stroker motor makes this worse. I had a catch can on mine, and it would fill up after about 15 minutes of regular driving. I got an old 2000 LS1 truck valve cover from the pass side of the truck(the one with the oil fill cap) with the built in baffle. I put the old valve cover on the drivers side of my car and hooked the catch can up to the tube coming out of the baffle. This eliminated all of the oil sucking into the intake. The baffle is in a different spot than the LS2 cover and keeps the splashing oil out of the vacuum stream.
The catch can now has about a couple of tablespoons of oil every two weeks.

brandon6.0

iTrader: (32)

Exactly. Or run temporary open breathers off each valve cover to see if it helps. A bad pcv valve will dump alot of oil. Remove and shake it. If it rattles loosely its bad. Replace it.

I.know from experience. Was having same issues with a NA 6.0.

atlhesi

many thanks for the input.

Tried to run with open breathers.

Still the same Problem. Oil fouled spark plug after 20miles
driving at cylinder 3 & 6.

My last idea are the oil rings.

Can the oil rings cause my problem ?

Can only the oil rings are not OK, because compression is OK,

But if really the oil rings are the problem, is it than possible
that I find a lot of oil behind the intake valve in the intake channel.

regards

Heinz

agoins

iTrader: (1)

This may be a long shot, it could be the oil rings. The oil expander ring could have overlapped when going in or one of the rails went in wrong. Has it been doing it since the rebuild? I would try doing a leak down test and if it is leaking from where.

atlhesi

will do a leak down test.

If the leak down test gives a bad result.

What do do as next?

Just to change the oiling rings at cylinder 3&6?

or all oiling rings ?

or all piston rings together ?

atlhesi

Thank you agoins,

Your estimation was right. The oil expander ring has overlapped.
The ring had already stronger contact to the cylinder wall.
See Picture 1

The engine buider mentioned that I would need is 4072GFX rings.

Here I have now a problem. The 4072GFX oil expander rings which
I bought recently are bigger. See other pictures

Changed wiseco the size of the expander rings or are there other reasons
for the different size of the expander rings ?

Are the small rings the reason for my oiling problem, becaus I think
the bigger rings cannot overlap.

Or are the bigger rings form the wiseco 4072 GFX package to big
and can cause a engine failure if installed ?

What shall I do now ?
Installing the small ring without overlapping
or installing the bigger 4072 GFX oil rings ?