Jump to content
SAU Community

Spark plug gap dilema.. 1.1mm or 0.8mm

Remix-

By Remix-,
in General Maintenance

 Share

Recommended Posts

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!!

  • Replies 72
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • ARB26
      RB26DETT Sketchy boost mod?

      By ARB26 · Posted

      I might be way off the mark here.. there must be a T junction under the manifold. That takes manifold pressure through a check valve prior to the T, one side splits out to this bleed off orifice, the other straight to the wastegate actuators. 
    • ARB26
      RB26DETT Sketchy boost mod?

      By ARB26 · Posted

    • ARB26
      RB26DETT Sketchy boost mod?

      By ARB26 · Posted

      Carrying out some engine due diligence before my first drive in a 260RS that has been in storage for 10+ years, and found two lines that are susposed to be plumbed into the boost control solenoid. One of the lines (the wastegate boost supply line) to actuate the gates, had a bolt in one end blocking it. The other line (main boost signal line) from the very rear of the intake manifold (RB26DETT) and runs up to the boost controller had this pill in the end of it as seen in photos. Other than the obvious (T28 Ceramic turbos might well be cooked)  Can anyone shed any light on if there is any validity at all with this mod, bleeding a constant fixed rate of manifold boost pressure off through this 3mm hole?  Is it deliberate?  Was this a 90s Jap mod done to RB26's? Or has someone just fitted this without any idea of what happens to ceramic T28s if they are not gate controlled?    
    • PranK
      Chris' Toyota Mark ii JZX110

      By PranK · Posted

      This looks great! Awesome to have the 5 speed with an LSD in this. The Recaro's look like SR2's or SR3's. It's a shame they've been retrimmed as they would have looked sweet in their original colours. I think I'd want my agent to be a little more up front and informative too. I've never imported but I reckon it would make me a little nervous, so the more info the better.
    • soviet_merlin
      Duncan's V37.......race car?

      By soviet_merlin · Posted

      Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
×
×
  • Create New...