Spark Plugs- What are you using?

[scottmphoto]

I have a '91 and I run the Champion coppers.

 

[O-Gauge Steamer]

Which number and heat range? Thanks.

Stock. Works fine. You must know that plugs do not last as long in any engine that has had it's DCR altered upwards. Either by forced induction or by simple high compression, they eat plugs.

I had a Triumph in '73 that ate plugs every couple of weeks or so. Used two sets as it was. One for city driving and a much colder set for the highway. Even at that, with the 13.5:1 CCR and the fact that it had been bored/stroked out from 2.0L to 2.5L it ate plugs.

Cost of high performance.

The project was based upon an engine from a '69 Triumph GT6+ that I stuffed into my '68 Spitfire. It was an I-6 as well, just a rather small one. Also swapped the bonnet from the GT6+ onto the Spitfire as well. Engine would not fit under the Spitfire bonnet...

 

[CobraMarty]

Stock. Works fine. You must know that plugs do not last as long in any engine that has had it's DCR altered upwards. Either by forced induction or by simple high compression, they eat plugs.

Sidewaysstarian thinks this is always due to detonation. Why do you think that these engines eat plugs?

 

[Hypoid]

Soooo, the NGK V-Power is not snake oil? This is the only non-platinum NGK I see listed in my area.

I have used Champion Copper plugs in the past and been happy with them. Last purchase, I had the counter person keep bringing plugs off the shelf, so that I could have six with the electrode centered in the shell. Time to look at other brands.

 

[KRG.FAB]

I'm running the ngk v-powers and have no complaints with them.

 

[GregGA]

Champion Truck Plugs off of Ebay. No problems.

 

[winterbeater]

Nobody's brought up the unique aspect of the coil rail XJ's. On a similar spark plug post a few weeks ago, somebody pointed out the fact, earlier unknown to myself, that with a lost spark system, half of the sparks are from the ground electrlde to the center electrode. A plug with double exotic materials, both on the ground side and the center electrode, is beneficial. I was a skeptic until I researched it.

 

[four_shot]

that with a lost spark system, half of the sparks are from the ground electrlde to the center electrode. A plug with double exotic materials, both on the ground side and the center electrode, is beneficial.

quoted for truth

Buster gets A/C Delco R43TS. Babs, the factory champion plug whose # curently eludes me.

 

[GrimmJeeper]

the factory champion plug whose # curently eludes me.

430 or 412 for HO, RC9YC for Renix