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Spark plug gap dilema.. 1.1mm or 0.8mm

Remix-

By Remix-,
in General Maintenance

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superspit Mentor

superspit

Posted
Posted
Yeah -- Know about practicality...............Pity you live so far away from me, you could do mine next time, I can't get even close to that 1/2 hour.   Jeeeeszuss, that would be worth watching.

30 mins for R33, never done an 32 before. Imagine it couldn't be too much different.

Would u believe that there are guys in these forums that actually do it way quicker than that!!!

5uck!! like to see how many scratches they put on their car!!! :wassup:

Yeah, if you lived closer, be a pleasure!!, and we'd take our time about it too!

I've since confirmed that my Platinums should still get close to 100000km's on a turbo car, with few mods....ace!!

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89CAL
89CAL

Stock ECU? Buy proper ECU

iruvyouskyrine
iruvyouskyrine

i heard a rumor that haltech sell haltech ECU's. Maybe ring them to confirm.

gtrken
gtrken

Got to agree with Duncan. The bigger the gap , the better the spark. The coil has to build up a stronger spark to jump the larger gap which makes for a fatter , hotter spark. Downside is that too mu

RedDrifter Experienced

RedDrifter

Posted
Posted

I am running boch 4's and had a bit of a miss when on the gas.

Just upgradded to splitfire coils and the miss is less by a long shot but is still there.

WIll probs get som BCPR6EIX-11 plugs and I'll let you all know how it goes.

Are boch 4's more of wank feature or r they resonable?

RedDrifter Experienced

RedDrifter

Posted
Posted
RedDrifter - i wonder if there was a problem with spark plugs and no need to go to splitfires in the first place.

Yeah I am thinking the same but its a bit late now to worry about it.

Well I guess my ignition system is alot stronger now.

nedb Proficient

nedb

Posted
Posted

I have 6 in it now, had it since i bought it but recently i found out nissan recommends 5 for the series 1 r32 and 6 for the rest.

i think that could be reason for not starting up properly when cold as few guys had a very similar problem with colder spark plug.

i might ger some coppers to see how it goes with different heat range.

Robo's Mentor

Robo's

Posted
Posted

I just installed iridium BKR7EIx11 last night. This is with the standard 1.1mm gap which maybe ok with low boosted cars but not high boosted cars. Now, i have a slight miss in the midrange when my boost is wound upto 20psi. Reading thru the net, high boosted cars require a smaller gap, hence the turbo blowing the flame out with a large gap. Now also reading you can gap iridium just be careful with that iridium tip. Make sure you dont hurt it with the feeler guage.

So im going to pull them out tonight and gap them down to .95 or 1.0.

Duncan Grand Master

Duncan

Posted
Posted
I just installed iridium BKR7EIx11 last night.  This is with the standard 1.1mm gap which maybe ok with low boosted cars but not high boosted cars.  Now, i have a slight miss in the midrange when my boost is wound upto 20psi.  Reading thru the net, high boosted cars require a smaller gap, hence the turbo blowing the flame out with a large gap.  Now also reading you can gap iridium just be careful with that iridium tip.  Make sure you dont hurt it with the feeler guage.  

So im going to pull them out tonight and gap them down to .95 or 1.0.

hey robbo almost right. you don't need a smaller gap to run more boost, what you really need is a stronger spark, eg better coils or a new ignition system :) Gapping the plugs down to .8 or similar is the easy solution but you will probably lose power

Robo's Mentor

Robo's

Posted
Posted
hey robbo almost right.  you don't need a smaller gap to run more boost, what you really need is a stronger spark, eg better coils or a new ignition system :)  Gapping the plugs down to .8 or similar is the easy solution but you will probably lose power

Ive got Spitfires coils allready. I reckon 1.0mm gap will be perfect.

Jax Collaborator

Jax

Posted
Posted

There's no "better" or "worse" in heat ranges. The heat range the manufacturer says is worked out by the combustion dynamics of the standard engine. Generally speaking the closer the insulation comes to the end of the centre electrode the cooler the plug. That is because the amount of metal protruding without being in contact with material which can dissipate the heat is less. A couple of simple examples as to why heat ranges may be changed with advantage would be in,say, a worn engine, burning some oil and running on lower compression, may tend to oil up plugs and misfire. A hotter plug would burn off the oil and not misfire. An engine with ,say, greater boost or compression,may tend to 'pre-ignite' fuel producing 'running - on' or 'knocking', because the centre electrode glows red hot and ignites the fuel prematutely. A cooler plug would fix it. Whilst that is unlikely with modern Engine Management systems, the measures to fix it [mods to fuel,mixture,timing,etc] damp down performance. Prob the only real way with a Modified engine, is a supply of different plugs and a dyno THERE"S A HAPPY THOUGHT.

  • 2 months later...
PlasticStan Enthusiast

PlasticStan

Posted
Posted
I just installed iridium BKR7EIx11 last night.  This is with the standard 1.1mm gap which maybe ok with low boosted cars but not high boosted cars.  Now, i have a slight miss in the midrange when my boost is wound upto 20psi.  Reading thru the net, high boosted cars require a smaller gap, hence the turbo blowing the flame out with a large gap.  Now also reading you can gap iridium just be careful with that iridium tip.  Make sure you dont hurt it with the feeler guage.  

So im going to pull them out tonight and gap them down to .95 or 1.0.

BK type plugs (ISO) are too short, you need BCP plugs. BK plugs are ISO standard which is shorter than the Japanese standard BCP type plugs.

:spcartman

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