Best spark plug for e30?

[zaq123]

if you run a CDI system it would make sense to run bigger gap to get more exposure. i might try gaping them down to 0.8mm to see if there is any perceived difference in engine behavior.

what did you find out? any difference with oem gap spec?

[digger]

if you run a CDI system it would make sense to run bigger gap to get more exposure. i might try gaping them down to 0.8mm to see if there is any perceived difference in engine behavior.

[nando]

I run the same plugs, I just gap them to stock specs.. no issues. I think the type of coil you are using matters too, a stronger coil can jump a larger gap.

[digger]

So who here with modified naturally aspirated M20 gaps their plugs?

i run BPR6ES on my stroker which uses stock dizzy, coil and OEM style leads with Aftermarket ECU. engine makes quite a bit more cylinder pressure than stock engine and i have chosen one step colder plug. interwebs says i will need smaller gap but never actually gaped them.....

out of the box IIRC the NGK are about 0.9 to 1.0mm and the handbook says 0.7-0.8 mm for the M20. so in effect i have increased the gap where theory is i should be closing it up with the stock ignition due to mods.

while i cant say ive noticed a major problem (other than those traced to problems with the spark plug leads) this does not really mean much as from seat of pants you might hear knock or feel a missfire there are other problems that may not be perceived. i do keep the ignition system in top shape and regulatory change plugs, cap rotor and coil

i realise that a bigger gap is better if the system is capable of providing the correct spark
other experiences?

[mccor023]

they changed the p/n for the B25 bosch plugs at one point W8LCR and then WR8LC or something along those lines.....was apparently still the same plug or newer version but 100% compatible they said

Yeah I know they changed the plugs and "enhanced" the plugs by changing the metal content. I read a post by levie explaining it, and I didnt believe at first how much of a difference it would actually make. But, from my experience the older version does perform better.

[AlexHale]

No interest in E3's?

[digger]

I use the BPR6ES too, as a side benefit to working well, they are cheap as dirt and i can go to any small redneck autoparts store in town and find them.

For a stock engine the equivalent would be BPR5ES

ive never gapped them either not sure if im supposed to lol

i dont know what the difference between the ZGR5A that is recommended over the BPR5ES's which i've also used.

[nando]

use NGK over bosch no fancy shit though, and on M20 with upper CR BPR6ES which is one range cooler.

I use the BPR6ES too, as a side benefit to working well, they are cheap as dirt and i can go to any small redneck autoparts store in town and find them.

For a stock engine the equivalent would be BPR5ES

[digger]

Just my .02 running similar setup (maf/ 19 lb) I ran the new Bosch W8LcR+ and fouled them out in 6months flooded the head. Searched harder and found the old style W8LCR no plus and Ive been smooth ever since.
I'm might have the pt#'s wrong an OG can correct them as Im sure they know what Im talking about.

they changed the p/n for the B25 bosch plugs at one point W8LCR and then WR8LC or something along those lines.....was apparently still the same plug or newer version but 100% compatible they said

[mccor023]

Yes.

[digger]

id probably consider champion plugs for the whipper snipper but not much else...... NGK always worked better than bosch for me

[AlexHale]

I too am running Bosch w8LCR+ and had one break, which caused a huge miss, and want to move one, btw are you running miller mccor?

[mccor023]

Just my .02 running similar setup (maf/ 19 lb) I ran the new Bosch W8LcR+ and fouled them out in 6months flooded the head. Searched harder and found the old style W8LCR no plus and Ive been smooth ever since.
I'm might have the pt#'s wrong an OG can correct them as Im sure they know what Im talking about.

[FLG]

Dont get anything fancy, over the years ive found on stock engines (not just e30's but in general) the OEM plug is really the best, period. On a built/forced induction motor, go with something better.

More so on an engine that burns out, before taking it apart my Charger was leaking oil past the valves ruining spark plugs, i found the cheap 1$ champion plugs not only lasted longer but she was happier, and when it came time to change i was only out a few bucks.

[AlexHale]

That's the answer I was looking for, thanks digger