Spark plug choice?

[BTI03L]

Ok om after a hotter spark plug for my 5 litre. I got no clue what to look for?? Anyone know the parts number for them and brands?

Cheers.

[HoldenOnn]

Go here; http://www.ngk.com.au/sparkplug_vehicle_type.php

Input your vehicle details and then find out the Standard Recommended Plug Number.

Once found, go and check out what the plug code means here (click on "part numbering system"); NGK Spark Plugs Australia

Once you have done that, you then need to change your plug code by one number to either a colder or hotter heat range.

I used to run 1 heat range colder on my 10sec street driven VL Turbo 3ltr. For example, standard NGK plug is BCPR6ES and I ran BCPR7ES. I did this due to higher and hotter combustion chamber temperatures in my boosted car.

Hope that info helps

[ari666]

5 is for petrol 6 is for gas or stupidly high comp ratios. think the 304's are 1.0mm gap stock and 308 are 1.5mm

[Morton]

Standard petrol spark plug numbers are as follows:

308: BP5FS (HQ - HZ)
308: BPR5FS-15 (VB - VL)
304: BPR6EF (VN - VT)

Now, you say you want a "hotter" plug.

Do you want:

1) a plug that runs hotter? i.e. one with less ceramic
2) a plug for an engine that runs hotter? i.e. a colder plug, with more ceramic to protect the electrode

IF you want a cooler plug, and the engine is a 304 in your VN, then you want BR7EF