Which spark plugs?

[haircutmike]

Just putting my top end together, (again) and wondered which spark plugs, (grade) are best for my heads.

Typhoon cam.
Higher compression then normal, (flat top pistons).
V8D stage 4 heads.

With my fixed fueling running a modded 4.3 ecu through standard dizzy, coil etc, fueling is always on the rich side running plugs that are a tad on the sooty side.

Any recommendations appreciated.

[blitzracing]

If the current ones are sooty, try dropping the heat value by 1 and see if they clean up. The problem with sooty plugs is the carbon can cause the HT to leak away down the insulator, but if they run too hot they can cause the engine to pre ignite as a hot spot in the combustion chamber, but dropping one in the heat range is not that radical.

[haircutmike]

My plugs at the moment are B7ECS.

So I need?

[Pupp]

haircutmike said:

My plugs at the moment are B7ECS.

So I need?

In NGK numbering, the lower the number, the softer the plug. B6ECS would be the ideal fella if available (problem is the ECS designation relates to a stronger than normal ground electrode and they are not supported on all grades)... if an ECS can't be had, then B6ES will have the same heat, thread and reach, or a BR6ES (or ECS) if you want a resistive version (no bad thing if using an aftermarket ECU). As I say not all versions available in all heats (no BR7ECS for example, which is what I really need, typically )

[Ant.]

Pupp said:

In NGK numbering, the lower the number, the softer the plug. B6ECS would be the ideal fella if available (problem is the ECS designation relates to a stronger than normal ground electrode and they are not supported on all grades)... if an ECS can't be had, then B6ES will have the same heat, thread and reach, or a BR6ES (or ECS) if you want a resistive version (no bad thing if using an aftermarket ECU). As I say not all versions available in all heats (no BR7ECS for example, which is what I really need, typically )

I run a 6 in my Griff.

[haircutmike]

Cheers guys, will do a bit of web searching tonight.

[daveparry]

What heads have you taken off Peter!

[haircutmike]

daveparry said:

What heads have you taken off Peter!

They were apparently Range Rover heads with slightly larger valves but single springs.

Rob at V8D kept them in exchange of the new ones.

[Pupp]

Ant. said:

I run a 6 in my Griff.

I'm sure 6s are more than safe in the vast majority of Rv8s on the road; I'm sure I remember reading that Pete Humphries used them in his blown S quite happily

[haircutmike]

Are my current plugs standard?

My engine is always close to pinking, dizzy backed off a tad from that point.
Given that, is a 6 worse, better or no effect on the pinking?

[Ant.]

haircutmike said:

Are my current plugs standard?

My engine is always close to pinking, dizzy backed off a tad from that point.
Given that, is a 6 worse, better or no effect on the pinking?

Yes, the B7ECS are the standard plug for Chims/Griffs

[Alexdaredevilz]

I was told by two Tvr specialists 8 heat range was standard plug and my engine won't pink at all!! No matter how advance I go

Maybe I've been using the wrong plugs :-s