Grid Life Time AttackSolo car? Or rally car?
Is that your Vega in the shop?Incase you gear heads haveseen the thread on this in the break room , come out to the Indiana model engine show, internal combustion, sterling and live steam steam.....you will not want to miss this......View attachment 303180View attachment 303181View attachment 303183
Mmmmm ground pounders.
Yes sir matching his & hers cars.....not mine....Is that your Vega in the shop?
Had one back in’76Yes sir matching his & hers cars.....not mine....
I've been fighting fouling spark plugs for a little while now and finally decided to figure out what was causing it. After some research I found that some people who run a Super Vic intake with a carburetor have lean issues on the 4 corner cylinders. When the same intake is used for EFI the 4 corner cylinders run rich.
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I decided to do some individual cylinder fueling with the EFI. I added 10% more fuel to the inside 4 cylinders and allowed the computer to remove fuel across all cylinders. This picture is after a WOT pull with immediate shut down. The Right plug is a front cylinder and the left plug is a middle cylinder. Still a little rich but moving in the right direction.
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These plugs are from the drive home after the WOT pull. They look much better than before but I decided to put an additional 5% more in the center for a total of 15% more. Loaded up 8 new plugs for racing Friday night if it doesn't rain.
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What heat range plugs are they?
Are the WOT plugs on spray or motor only?
Can you run a gasket seal plug that would allow you to index your plugs? That allows some control of where the flame front is in the cylinder.
They're definitely getting better but wow that first set was crazy fat. What ignition box are you running? If it has the ability, you could add a degree or two of timing to the corner cylinders. Or you could run a little hotter plug in the corner holes.
The intake issue on a carb set up is because the corner runners are longer and not as inline with the carb. So, the corners suck in less fuel causing them to be more lean. On an EFI set up if the injectors dump an equal amount of fuel it causes the over rich condition in the corners, because the longer runners have a lower air speed.
Back when we ran a single carb, we ran a little more fuel jet in the fogger for the corners. It kept them from being lean.
They are NGK 7 range. A little cold for NA but I think right for nitrous
The WOT plugs are just motor
I haven't looked into indexing the plugs
Timing is all controlled by the Holley and I can add or remove time on individual cylinders.
That is what I read and it makes sense. I did think about getting a new intake (Holley High Ram) but it has gone up about $350 since I first looked at it. Adjusting the computer is free...
Wow, I hadn't thought of the intake causing that. Glad you made some progress.I've been fighting fouling spark plugs for a little while now and finally decided to figure out what was causing it. After some research I found that some people who run a Super Vic intake with a carburetor have lean issues on the 4 corner cylinders. When the same intake is used for EFI the 4 corner cylinders run rich.
View attachment 304852View attachment 304853
I decided to do some individual cylinder fueling with the EFI. I added 10% more fuel to the inside 4 cylinders and allowed the computer to remove fuel across all cylinders. This picture is after a WOT pull with immediate shut down. The Right plug is a front cylinder and the left plug is a middle cylinder. Still a little rich but moving in the right direction.
View attachment 304854
These plugs are from the drive home after the WOT pull. They look much better than before but I decided to put an additional 5% more in the center for a total of 15% more. Loaded up 8 new plugs for racing Friday night if it doesn't rain.
View attachment 304855
View attachment 304856