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Author Topic:   406 sbc oil burner
theslowguy
Member
posted February 17, 2004 08:16 PM
Maybe the guy that built it! lol


Raz_900
Member
posted February 18, 2004 12:38 PM
Were the top rings gapped right when it was assmebled? What kind of valve seals were used?

For oil consumption to be that bad, I'd be leaning towards wrong ring gap broke the top of a piston off. When you say the oil is contaminated, is it fuel or combustion gases that contaminate it?

Ego Racing
Member
posted February 18, 2004 02:12 PM
Could be broken rings


NWModracer
Member
posted February 18, 2004 02:18 PM
sounds like standard rings on .030 pistons


theslowguy
Member
posted February 18, 2004 06:59 PM
quote:
Originally posted by theslowguy:
The ring gap was within the specs that came with the rings. Its blowing smoke out both sides equally, but i run an H-pipe. Blow-by is between 6% and 8% with compression between 220# and 230#. Don't have any clue about the valve seals, ordered the heads assembled. Oil is black and smells a little burnt but not like fuel at all.

If you used the specs from the rings and not the KB piston ring specs, you're in trouble. Ring company's spec .010"-.020" for end gap. KB's need at least .026" on a street 350 and upwards of .030" gap on a race motor. The KB's locate the top ring higher than normal and they transfer more heat, so the gap needs to be increased to compensate.

And moly rings don't seat? That's a new one to me. Maybe you meant chrome rings don't seat? Nearly every engine builder uses moly or plasma moly top rings. I've thrown moly rings in some pretty nasty bores over the years and they seat instantly. Never used a drop of oil.



littleb24f
Member
posted February 19, 2004 08:47 AM
How is the crankcase vented?? Had a like problem on a motor at the track and found someone put a rag in the breathers on the V-covers to help stop oil from comming out. When they got all wet they pluged up. This caused the preasure to find new and creative ways to exit the block.


dirtracer14
Member
posted February 19, 2004 02:27 PM
You also might want to make sure that the iontake was bolted down correctly i had a motor one tiome that had a bit of smoke at idle and got real bad the more i got into it....pulled the carb and saw oil in the runners from the intake gasket not sealing properly.


NWModracer
Member
posted February 19, 2004 02:31 PM
Try replacing the PCV


Okie11m
Member
posted February 23, 2004 09:27 PM
The rings were gapped per KB specs & not the ring man. specs. Hey bro. have ya figured it out yet?? You got alot to check.

Thanks for the input guys.

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