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Spark plugs since fitting MegaSquirt?
Major Stare - 14/4/06 at 03:28 PM

Running a X-Flow with Ford EDIS and MegaSquirt.

What spark plugs should i be fitting, i understand the "normal" ones are not suitable ! ?

britishtrident - 14/4/06 at 03:48 PM

What plug you use depends on your engine and its state of tune not the ignition system, however you should set the spark plug gap to the same as that recommeneded for a Ford EDIS donor such as a Mondeo 1800 ie 1mm or 0.040"

For a standard/GT 1600 xflo Champion N9YC RN9YC, NGK BP6ES or BPR6E or the platinum or iridium equivalents.

For a slightly more modfified engine Champion N7YC or RN7YC --- NGK BP7ES or BPR7ES or the platinum or iridium equivalents.

For a hotter still engine try Champion N6YC or RN6YC ---- NGK BP8ES or BPR8ES




[Edited on 14/4/06 by britishtrident]

Major Stare - 14/4/06 at 04:43 PM

Cheers.

I bought the engine with the car and was told of the following spec....
1700 X-Flow
Polished and Ported Head
BCF2 Cam

So i'd say slightly moddified.

greggors84 - 14/4/06 at 05:40 PM

BT, where did you get that info from?

Just interest what the best plugs for my modified pinto running coil and dizzy ignition are.

Thanks

britishtrident - 14/4/06 at 06:50 PM

I haven't much experience of 18mm tapered seat plug heat ranges --- 14mm I know pretty well.

Of course with 18mm plugs the heat range generally avaiable is pretty restricted sdo I suspect the standard Champion RF7YC and NGK APR6FS are hobsons choice.

As a rule I always found an NGK plug to have a wider working heat range than the Champion equivalent.

Peteff - 14/4/06 at 07:26 PM

Champions only lasted 3 months in my standard pinto then started misfiring and causing starting problems. The NGKs in it now have been in 2 years and still work perfectly.

britishtrident - 14/4/06 at 09:11 PM

quote:
Originally posted by Peteff
Champions only lasted 3 months in my standard pinto then started misfiring and causing starting problems. The NGKs in it now have been in 2 years and still work perfectly.


If the plugs are too "soft" (more correctly are too "hot" for the engine they get overheated the insulator nose starts to break down and they "fire up the barrel" -- hence missfire.
Only cure is a "harder" (colder) plug or one with a wider heat range.

When NGK arrived in the UK in the late 60s they were way ahead of Champion because NGKs copper core gave them a much wider heat range, Champion and Bosch did a lot of catching up but NGK still is has a wider heat range than Champion.

If the plugs are too cold they get oil fouled at low speeds --- much less of a problem than it used to be because modern high energy ignition systems supply much stronger sparks.

Hellfire - 14/4/06 at 09:11 PM

Get in touch with NGK Technical

01442 281000

Major Stare - 16/4/06 at 03:48 PM

Cheer all, NGK's it is then!