Join Date: Feb 2013
Location: Auburn Hills, MI
My Ride: $500 Duster
Engine: 3.8L 6G75
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Re: LeMons racing - 1992 3.0L Duster at Autobahn Country Club (Joliet IL)
Thanks for the embedding help. Original post fixed. :)
Gonna try the FelPro this time around. We've been using the generic head gaskets (DNJ?) that come with the rebuild kits and something obviously isn't working. Also thinking about switching to head bolts in lew of bolts.
We tried running a step colder back in April with the original oil injected motor, but the 190,000 mile rings fouled them out pretty quickly. In all honesty, I've never had a positive experience running colder plugs in any motor. They would always foul out before any advantage could be had. YMMV.
I'd love to run water wetter, but rules explicitly say water only. Kinda sucked in April where we had to drain the block and radiator each night in preparation for ~20°F nights. With the next race in November at Road America (Wisconsin), we could be doing the same thing again. On the plus side, it's easy to drain the system... just dump it in the grass.
Stock sized oil filter with synthetic 10W/30. Not a fan of thicker oil on OEM clearance motors. I thought about running Brad Penn straight 30 last June, but balked at the price. Not sure I want to run a straight weight in November.
I'm pretty sure the high rpm miss was detonation caused by water getting into the cylinder. I agree with your distributor analysis. An old racer once have me timeless advice: "if it's down low, it's ignition. If it's up top, it's fuel." His theory is usually right ~90% of e time. ;)
... and yes, we run plenty of zinc in our oil. Here we were, thinking we were all clever using a trick nobody else knew about.