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Raw fuel questions...
Posted: Sun Mar 12, 2006 11:03 pm
by draglist
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.
Posted: Wed Mar 15, 2006 4:32 am
by Leon
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.
Posted: Wed Mar 15, 2006 9:15 am
by Rapid Randy Baker
Nice Leon,,,,welcome to the board by the way.
Posted: Wed Mar 15, 2006 9:24 am
by jim sanders
Posted: Wed Mar 15, 2006 11:03 am
by Bob Kraemer
Leon,
Excellent explaination!!!
Posted: Wed Mar 15, 2006 11:05 am
by Rapid Randy Baker
Hi Bob,
He did pretty good for a guy from Kansas didn't he!
Posted: Wed Mar 15, 2006 11:06 am
by draglist
Thanks, Leon! bp
Posted: Wed Mar 15, 2006 11:09 am
by Bob Kraemer
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!!!!!
Posted: Wed Mar 15, 2006 11:12 am
by Rapid Randy Baker
No, he is a displaced Calif dude! Lost his surf board so they banned him to Kansas with his brother Lippy {Steve}.
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.
Posted: Wed Mar 15, 2006 11:21 am
by Bob Kraemer
Sorry
Forgot we were talking Nitro.
Should have been a 16 spark plug vote.
Banished because he lost his surf board. That's not good.
In California that's a no no.