Autolite 104's fouled

[sdteb]

Ok, ecugn, champion heads , all the goodies in the motor, went 9's on q16 in 2009, put the motor in the Limited for my daughter, and its fouled number 2 and then a month later, number 5, mainly street car, but we go beat on it at the track a couple times.... runs, great, except when it fouls a plug.. wrong plugs?

 

[Mr.Spool]

Which champion head?

 

[Mr.Spool]

I wouldn't run a 104 plug

 

[Pronto]

2 and 5 share the coil. Maybe the coil is going bad.

 

[sdteb]

Which champion head?

gn1's

 

[sdteb]

I wouldn't run a 104 plug

which plugs would you suggest??

 

[dynoman]

Brisk DR12S . Maybe one step colder , but I would start there . I run Brisk plugs . Summit has them .

Heat Range

HEAT RANGE COLD HOT BRISK 8 10 12 14 15 17 NGK 10 9 8 7 6 5 DENSO 31 27 24 22 20 16 Heat range is the measure of how fast the spark plug tip dissipates combustion heat. It must do this in precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or...

briskracing.com

 

[Mr.Spool]

This^^^^^^

 

[Haulz A]

Ok, ecugn, champion heads , all the goodies in the motor, went 9's on q16 in 2009, put the motor in the Limited for my daughter, and its fouled number 2 and then a month later, number 5, mainly street car, but we go beat on it at the track a couple times.... runs, great, except when it fouls a plug.. wrong plugs?

Attached is an Autolite spark plug cross reference chart. Like Mr spool said in a earlier post- I would not run 104 plugs on GN1 aluminum head bc they are tapper plugs which should not be ran on GN1 or TA aluminum heads. Need a plug with a crush washer such as the NGK R567A- 7 to -11 or the Autolite AR3931 to AR3935. Those plugs are 7 to 11 heat range plugs which is good for high boosted applications. Just my two cents concerning the matter- good luck with your project.

Haulz A

 

[Mr.Spool]

Nothing good happens when the plugs is too far out into the chamber

 

[BEATAV8]

NGK 5430 is a good spec for aluminum heads. It’s a resistor plug, non projected, gasketed, and a heat range of 8. Available on eBay

 

[Mr.Spool]

Brisk DR12S . Maybe one step colder , but I would start there . I run Brisk plugs . Summit has them .

Heat Range

HEAT RANGE COLD HOT BRISK 8 10 12 14 15 17 NGK 10 9 8 7 6 5 DENSO 31 27 24 22 20 16 Heat range is the measure of how fast the spark plug tip dissipates combustion heat. It must do this in precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or...

briskracing.com

Only plug I run these days
Advantage= you can go colder for serious power and not foul out while idling or part throttle street driving,
Also works with a stock ecm
Best plug I've tested so far

 

[Haulz A]

Only plug I run these days
Advantage= you can go colder for serious power and not foul out while idling or part throttle street driving,
Also works with a stock ecm
Best plug I've tested so far

Brisk is an excellent plug for high horse power applications and great street driving as well. It really comes down to how well of a tune a car has @ idle, cruise , WOT and the type of fuel used which will directly determine the life of the spark plugs. I always install new set of plugs when racing my car- just a little cheap reliable maintenance.

Haulz A

 

[Mr.Spool]

Brisk is an excellent plug for high horse power applications and great street driving as well. It really comes down to how well of a tune a car has @ idle, cruise , WOT and the type of fuel used which will directly determine the life of the spark plugs. I always install new set of plugs when racing my car- just a little cheap reliable maintenance.

Haulz A

Cheap reliable matinence
You have jokes today
I remember cheap miss those days lol

 

[434nova]

I run autolite 104 @ 32 psi and drive on the street with them no problems. My gap is 25 thousands. I also ran autolite 103 but those fouled out quick. You can also run a gasket style plugs with the champion heads.

 

[Mr.Spool]

I run autolite 104 @ 32 psi and drive on the street with them no problems. My gap is 25 thousands. I also ran autolite 103 but those fouled out quick. You can also run a gasket style plugs with the champion heads.

Think the op is talking e85.
On pump gas alky the 103s did fine around 30ish psi depending on cylinder pressure/compression