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Old 08-16-2011, 07:28 AM
  #79  
kod99
Senior Member
MASTER BUILDER
 
Join Date: Sep 2008
Location: Red Deer, AB Canada
Posts: 213
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To continue my saga:

First pass:
8.19 @ 161 mph - Max RPM: 6600

Nozzles: 41
Main pill: 90

Car ran well but sprayed oil out of the vacuum pump breather again. Estimate about a quart sprayed.

Disconnected vacuum pump and hooked up header evac system.
Changed oil. No milking of oil - no methanol in oil. Drained Vacuum breather tank. It was full.

Pass 2:
8.12 @ 163 mph - Max RPM: 6900

Nozzles: 41
Main pill: 90

Car ran better. Oil film inside of header collectors after run.
Changed main pill to 88.

Pass 3:
8.02 @ 165 mph - Max RPM: 7050
Nozzles: 41
Main pill: 88

Car ran even better. Very slight oil film inside of header collectors after run. Temp after run: 220.

Traction was a problem with 60 foot times around 1.19.

I think I may have the answer for the oil spray. Due to space restrictions, I had to mount the vacuum pump breather can above the engine and directly in the airflow. Could it be that the air rushing through the breather filter is creating a vacuum and pulling the oil out?
Should I build a shroud to put in front of the breather filter? Would that help?
On the dyno, very little oil was puked out of the exhaust hose from the vacuum pump. Maybe 2 tablespoons in 23 hits.
I kept the engine leaned out until I was ready to roll into the burnout box, then went full rich until the return road.

One footnote:
I pulled the chute for the first time. Everything worked great and I saved a lot of brakes. I will be pulling it regularly from now on.
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