BADASS stick 93 cobra n/a

Thats Marc Arnolds Cobra. Its a badass little 359 inch, 14:1 engine. Lots of $$$ in that one. the best part is its a Hydraulic roller going well past 8,000 RPM!!! Marc has done his homework and it has definately paid off, definately a good guy as well.

Here's a link to his site and a ton more vids.

http://www.the-arnolds.net/Cobra/
 
91trunk said:
Why does he shut the car off at the end of the run? :dontknow:
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Not sure if this is a trick question or a hint of sarcasm.... But here's a serious answer:

The plugs tell you a lot and the only way to get an accurate reading it to cut the engine off at WOT. In doing this the car must be towed back to the pits. Yes he has efi but not a system with a data logger, so the plug reading method is what he has to do to get the A/F ratio correct.
 
QuickLX said:
Not sure if this is a trick question or a hint of sarcasm.... But here's a serious answer:

The plugs tell you a lot and the only way to get an accurate reading it to cut the engine off at WOT. In doing this the car must be towed back to the pits. Yes he has efi but not a system with a data logger, so the plug reading method is what he has to do to get the A/F ratio correct.
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I C. Makes sense. Why not just get a data logger though? Seems it would be alot easier and less work. :dontknow:
 
91trunk said:
I C. Makes sense. Why not just get a data logger though? Seems it would be alot easier and less work. :dontknow:
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Yeah, the data logger would make things somewhat easier, but the data logger info should also be backed up or validated by a physical reading. Sensors can and will fail, so essentially there is no replacing the reading of plugs. Also, for guys that really need to lean on their stuff or are looking for that extra couple hundredth's or more in the finals at a big event, its a must. This is especially necessary with drastically changing temps like we have here in Michigan. Hell, our last time out, it was 37 degrees when we started but 57 when we finished, and from a carb'd standpoint it required some jetting adjustments.
 
That's some good info but honestly it's because of the aluminum rods and high revs. Since the rods are only good for so many passes and tend to stretch.
 
SVTSINR said:
That's some good info but honestly it's because of the aluminum rods and high revs. Since the rods are only good for so many passes and tend to stretch.
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Marc has been cutting all of his engines off at WOT for tuning since he was running the 306's and the 347 prior to his current engine . Beside that, being that it is a stick car, if his concern was about the rods stetching, he could just push the clutch in and let it come to an idle.
 
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