ONEBADMK8 said:
The Bonneville Mark was an "alleged" stock engine 4.6.
Here is what Jerry said they did to the Bonneville Mark.
"The engine itself was truly a production Mark 8 engine that was just blueprinted. It had no cats and a dual exhaust. It was ran on dyno prior to installing it in the car and made 290-295 HP. It was truly a stock engine. There wasn’t enough time to put together a highly modified engine. We started working on this program about 2 months before the trials in Utah.
The transmission was stock but we did search for rotating parts that had no imbalance and no runout on the shafts. Then we built the transmission with high clearance on the clutches and bands that would not be applied during the 3rd gear runs.
The axle was changed to a 2.47 axle. We wanted to run in 3rd gear to have higher transmission efficiency. Anytime you have to turn a gear set, you are giving up power. Third gear is direct drive and you are not spinning any
gears. So we figured we needed a 2.47 axle to run in 3rd gear.
The air suspension, which normally lowers the car about 20 mm when you get above a speed, was set to lower the car another 25 mm so the car would drop almost 2” from it’s static ride height.
Aside from this, the only other changes to the car itself were removed rear brakes (for less drag), removed side view mirrors, some fabricated “belly pans” for under the car and some kind of air deflector behind the grill, and the skinny Bonneville tires. (Of course the car had a roll cage and a two-piece driveshaft)."
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Blueprinted engine
Low friction tranny
No Side mirrors
Belly pan
Taped off grill
Removed rear brakes
'skinny' race tires
Hitting 5700 rpm with a 2.47 rear in 3rd (1.00) keeping the stock tire height of 26.6" would yield a trap of 182.618.
So the question is: Can a 260 hp (rwhp) Mark with a drag co-efficient of .33 and a race weight of 3700 pounds make that run with ultra low friction internals and tires?
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I say...sure.