oil contaimination on spark plugs ???

guys,

running a sbc , twin turbo mech injection
after about 4 passes, i'm getting a honey brown colour on the electrode , and base ring of the spark plug.

the ignition is msd 10 + , alternater ,
29 deg locked
ngk - 9 , v power , 3/4 reach , washer type
23 deg dart pro 1 heads

Nil additives in methanol...

cylinder leak downs are 8- 10 % hot , 12-13 % cold
after 1 run, ignition timing shows the burn mark on earth strap to be just around the radius.

Nil cad burnt off base ring...
no valve seals on intake or exhaust

exhaust colour a dark grey

would this be oil ???

thanks
ash

 

Crashley,
You have to give all of the variables to take in. Is this the same engine with the torched cap and rotor you have on another post?

 

lorenzo:
it was not my engine that was hurt
i was saying my msd 10 does NOT do the roto burning thing


cheers
ash

 

mike,
no not wet
colour is honey brown , down to about 1-2 threads from earth strap, all way round.
no, will not clean off.

will "steal" a digital camera off my daughter, and post a pic.

thanks

ash

 

emails replied to
thanks again for your time mike

regards

ash

 

Why no Valve seals!?! I ran valve seals on Bobby Baldwin's TF car,,, and personally would run them on everything. .0008 guide clearance is fine,, assemble with White Lithium grease. NEVER had a valve gall or "snatch" to the guide.

 

rang the guy about this subject..
he said there was no room to put the seals on
triple springs , 1.62 dia
23 deg head


you think it should have seals?
what about the intake manifold pressure, would that stop lots of oil down guides?

ash

 

AFTER TALKING TO MIKE AND OTHERS,
i 'm starting to think it was not oil containation...

the fuel in the car turned a yellowy colour over nite,.
i used a mates fuel, and the drums he gave me were dusty ( old fuel ??)
fuel gets filtered before going into car.

on the fri nite tnt, it rained, car did not get wet....
sat race day , i could "see" a yellow colour in fuel tank.

i don't think anyone would have " dosed" up the fuel.....

run the car to 1/8 mile only, funny colour on plugs, would not wash off.

changed plugs , did the same again.
lamdba reading .74


ash

 

Blowers and Vacuum

When I bought my data logger (Performance Trends) they wanted me to by a PSI sender that could handle vacuum. I told them I NEVER have vacuum. Boy was I wrong, 30 lbs boost and when the butterflies close, vacuum!!
I don't run valve guides seals, sure I have in the past but have not seen a difference between when I have them and when I don't.

I can say for sure there is a little bit of vacuum on my 30 psi blown alky engines.

 

Pressure

I do not run valve seals either but the statement of being under pressure wont allow the oil to get into the intake runners can be a false statement. I learned this lesson back in my chevy blower days when an intake gasket would begin to leak at the bottum and start sucking oil through the intake. With the velocity of air running through the intake this can actually cause a vortex and actually begin to suck the oil. This does not seem to happen through the valve seats as I believe this is because where it is in the runner but it can through you for a loop on a chevy with the smallest leak on a intake gasket.

 

yeep i see what you mean.
i did have a little problem with blowin g the intake gasket out...
i had it ( intake) machined up, and repaired.....
no crankcase pressure on the engine under boost found...

thanks
ash