Proper spark plug gap?

[Fisher1983]

What is the proper plug gap for a lightly modified Predator 212? The manual doesn't say. I have a Hemi with a header, billet filter adaptor, Uni filter, number 90 main jet, and a .016 pilot jet. After I jetted it today, it felt soft on acceleration. I checked the gap and noticed it was smallish at .027. I opened it up to .040 and it felt better but I'm still wondering what a safe range is. I'm still running the factory Torch plug until I purchase an NGK BP6ES. Edit: also worth mentioning the engine retains the governor operating at 3800 rpm on a stock geared DB30.

 

[Stangrcr1]

Get a new plug. it should be gapped from the factory. The stock plug sucks.

Opening the new plug to .040 is ok, but the stocker won't last long.

 

[OND]

We 've had really good luck with a Autolite AR3910X plug, costs a little more but well worth it in the long run.

 

[Camjamsdad]

We 've had really good luck with a Autolite AR3910X plug, costs a little more but well worth it in the long run.

And there's no gap even if the box says to gap it.

 

[Fisher1983]

I'm going to stay with a standard plug since I don't have a racing engine. It doesn't turn enough rpm or run hot enough to benefit from a multi electrode design. I'm just surprised the factory manual doesn't say the gap...

 

[Stangrcr1]

My predator is stock and has the Autolite plug above....

The benefit is a great plug that you won't ever have to worry about again. Put it in and forget it.

 

[stargazer7467]

hell i use the autolite racing plug in my GC engine and i notice a difference.

 

[SnakePliscan]

Blazer cranks on

Iin my experience Low power ignition systems like what are found on single cylinder industrial motors, like a ground electrode that is ground or filed to a point, Also use a high preformance plug wire. get the fuel right,

If you do this the voltage requirement to spark drops and you can open the gap a bit for a bigger spark.
Opening the gap requires more voltage so go a little at a time.

Bbasicly your gapping the plug to the systems voltage capability so when you start to experiance misfire stop and back up a bit, THAT will be the gap your motor wants not what some book or person says.

Read ohms law. ionization and how lightning is made.