I have a73 2.0, stock, except for the pertronix electonic ignition module. Which spark plugs are recommended for normal cruising, not a daily driver, some say Bosch and some say NGK. Also I have heard you gap the plugs different if you have the electronic ignition module, all comments appreciated.

Ian Stott
Moncton
Canada

NGK B6ES is what I ran. Now I run the NGK B6ES-11 with the CDI. The "-11" denotes that it is pre-gapped at a .044".

Bosch copper or NGK copper.

Forget about the platinum crap.

Generally, I run nothing but Bosch Copper, but NGKs are great too!

The local Parts Store didn't have the Bosch but did have Champion COPPER plugs which are in the car and running great, gapped at .040 with Pertronics Ignitor ignition and Flame Thrower coil. Time will tell.

Could gap larger up to .050 I'm told which increases the life of the plugs due to the
larger spark the Pertronics throws across the gap, which is a good burn.

NGK B6ES with mallory CDI and Coil

Ian,

I had a stock 74 2.0L with pertronix - always ran the NGK-BP5ES. The BP6ES ran hotter, so I stayed with the 5's. I'm in AZ so cooler was better - maybe not your concern.

What do you mean by "ran hotter"?

What did you gap the NGK 5ES at with the Petronix? I heard you could widen the gap but didn't know by how much, I did hear it was better than points. Does a hotter plug have more spark??

Ian Stott
Moncton
Canada

I am unable to find the NGK B6ES anywhere. Pelican lists the NGK BP6ES as the plug for the 914.

My local parts store has some copper NGKs but they are not the ones listed on Pelicans site.

Spark plugs are rated in "heat range". Below is a link to at least one discussion ..

And a "hotter" spark plug does not have more spark.

Hot vs Cold

Push comes to shove you can order them:

http://www.amazon.com/NGK-B6ES-Traditional...g/dp/B000CJ3X4O

So what's wrong with the Bosch Platinum plugs?

I perfer the BP6ET it's a triple tip , Bill D.

http://vwparts.aircooled.net/NGK-BP6ET-Spa...-16-p/bp6et.htm

Other than they're junk, you mean?

Here's a question for you. If they cost less wholesale than the corresponding copper plug, and they sell for more, what's the counter person gonna push?

They just don't perform well in VW and Porsche engines. Or BMWs, either, for that matter.

The Cap'n

I'm running br6es in mine. Couldn't find in any auto stores but turns out they are common in bikes. Had heaps in stock
I tried a set of Bosch platinum plugs in my Saab daily driver and couldn't rev over 4k. Was like hitting a hard cut rev limit
Edwin

Looks like a nice plug.

It's true, they are filled with popcorn.

So what's wrong with the Bosch Platinum plugs?
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It's true, they are filled with popcorn.


I had no idea that the Bosch Platinum plugs are so bad for our cars!

If you are running a Petronix with a stock blue coil run the stock gap.
If running MSD, CDI, etc you run a much larger gap.

A Petronix by itself is basically just a signal/switch.

Okay so I am so confused now. If you do a parts search on NGK's site for '73 914 2.0 you get a recommendation for BR6ES.

If you go to Pelican or autoatlanta they list the BP6ES and BP5ES.

Autozone lists the BPR6ES or BPR5ES.

Is there a problem with running any of those as opposed to B6ES plugs? I am not sure what the difference is.

After looking a bit I found this handy dandy decoder. From this it looks like only difference between B6ES and BP6ES is the projected insulator. Not that I know what that means or if it is okay

http://www.kaila.net/tl125/tl125ngkcode.html

From what I've read the bp6es is fine to but why not use the correct one?
The r just reduces noise for radio and in my case efi

Mainly I just wanted an option that was available locally rather than waiting a few days for them to come in.

Gerard,
Mark me confused
The AutoAtlanta parts site claims that the 6 is a cooler plug than the 5?? They recommend the 5 for normal driving and the 6 for "spirited" driving.

...Bosch copper also!...

NGK BP6ES on a stock 2.0L w/44 IDF's, MSD & Blaster coil, .040 gap.

IIRC, the "R" denotes a resistor plug & on NGK plugs the higher the number the cooler the plug is. Opposite of Bosch plugs.

BTW, I use to use Bosch until they changed their #ing system. Now it's NGK all the way.

Hope this helps.