hey what sort of spark plugs should I be using with my A14 that has higher compression than standed? The motor has had a bit done to it. Its running 1.00 OS pistons with 1mm Dish and the head has been planed im using just a standed permaseal head gasket. any info would be good!

Hello,

The usual way of choosing plugs it to stick with the standard ones and after driving for a while pull them out and look at them. You can tell from the plugs weather it's running rich, lean, the plugs are too cold or too hot. All of my service books have pictures and so on explaning it. Try one of the spark plug websites, they usually have heaps of info. From memory NGK is pretty good.

Yes, if compression is 10.5:1 or less you probably need standard heat-range plugs.

What is the factory recommended plug? NGK BPR6ES, does that sound about right? They were the plugs that came with my motor before I put all my hard earned cash into it haha. Cheers!

another Q.s how do you down size images? It says you can only upload a 200k image. Im wanting to make a post about my 1200 build up.

BE6 sounds right.

See photo FAQ #6

yeah i use BP6ES plugs and have treated me well.
as for the pics use photobucket or something similar as is alot easier to post.

Hey a good plug to try is Bosch Platinum Plus they are about $7 a plug and I have had very good results with them. Choose standard heat range and see how they go

Or, get $0.95 Champion plug. I've had good results with them.

Quote:
The standard plug, .. from memory, is the NGK, BP5ES. If you are running the engine fairly hard [heavy loads, high speeds, prolonged high speed runs, then go colder [BP6ES] but if running around town at lower speeds, then stay with standard plugs.

I am using a Pertronix electronic conversion in my stock 1200 with a GT40 coil & some low cost 'old stock' Bosch Platinum plugs.

I like either Platimum or Iridium plugs because this costly metal allows a fine, or smaller diameter center electrode to be used.
Now the plug will fire across a given gap, at a given compression pressure at a lower voltage with this type if plug, so it stands to reason that a bigger gap can be used without pushing the coil to its limits & this can only be a good thing.

Bigger gap means bigger spark & it provides a more positive means of lighting the fire in there.
Works for me.