Raw fuel questions...

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draglist
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Raw fuel questions...

Postby draglist » Sun Mar 12, 2006 11:03 pm

From Mrsuptownlooks via email...

Bill when a Top Fuel are Funny car doe's his burn out there is a large amount of raw fuel that comes out of the headers why doe's this raw fuel foul out the spark plug. I have notice that when they make a run and the driver will have to pedal the car this some times will put out a cylinder.
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Leon
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Postby Leon » Wed Mar 15, 2006 4:32 am

On the burnout,their is no load on the engine,only rpms.When you have a dual pump built into 1 housing and putting out 95 gpm at 4000 rpms pump speed and no main jet altho they do have 1 side of the pump off on the burnout and until the car is ready to stage,it has to go somewhere.Since the faster the engine goes,the faster the pump goes,the blower isnt making much boost,so the engine is rich. Nowadays,the magnetos are putting out 44 amps of primary power and 950 millijoules of spark at the plug for 26 degrees of crankshaft rotation,each,they will relight as they arent on the throttle for over 3 or 4 seconds.

On a run everything is set for a max traction situation. When the tires start to loose traction,the load is taken off the engine and cannot burn all that is being pumped into the engine or the clutch is set too loose and this also takes the load off and cylinder go out and usually dont relight as its being flooded with fuel.Usually when a cylinder goes out,the rest of the cylinders go lean as they have to take up the slack of loosing 1000 hp and start to mix the fuel distribution in the engine.At this point,the engine says it needs to take a nap now.

When a driver has to pedal a car from either lack of traction or headed out of the groove,this also takes away load just like a burnout. Again,the fuel cannot be burned,so cylinders quit firing.

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Rapid Randy Baker
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Postby Rapid Randy Baker » Wed Mar 15, 2006 9:15 am

Nice Leon,,,,welcome to the board by the way. :)
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jim sanders
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Postby jim sanders » Wed Mar 15, 2006 9:24 am

8) 8)

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Bob Kraemer
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Postby Bob Kraemer » Wed Mar 15, 2006 11:03 am

Leon,
Excellent explaination!!! 8)
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Rapid Randy Baker
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Postby Rapid Randy Baker » Wed Mar 15, 2006 11:05 am

Hi Bob,

He did pretty good for a guy from Kansas didn't he! :lol: :lol:
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draglist
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Postby draglist » Wed Mar 15, 2006 11:06 am

Thanks, Leon! bp
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Bob Kraemer
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Postby Bob Kraemer » Wed Mar 15, 2006 11:09 am

Rapid,
He did do a good job, wonder if he learned from Kansas John Wiebe?
Either way he gets an 8 sparkplug vote in my book!!!!! :)
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Rapid Randy Baker
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Postby Rapid Randy Baker » Wed Mar 15, 2006 11:12 am

No, he is a displaced Calif dude! Lost his surf board so they banned him to Kansas with his brother Lippy {Steve}. :lol:

He was working in Calif with Verhaul {s}, Bonnin and all those guys from up North. He can fill you in better than I can. :)
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Bob Kraemer
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Postby Bob Kraemer » Wed Mar 15, 2006 11:21 am

Sorry
Forgot we were talking Nitro.
Should have been a 16 spark plug vote. :lol:
Banished because he lost his surf board. That's not good. :( In California that's a no no. :)
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