Gap for NGK Iridium IX BPR6EIX Spark Plug (BPR6E-IX 6637)

[A500TVR]

Hi,

I am about to fit a set of NGK Iridium IX BPR6EIX Spark Plug (BPR6E-IX 6637) to my 500 and I was just wondering what I should set the gap to?

I know that there is lost of debate about this new technology or stick with the original but I guess it is 2013 and maybe things have moved on!?

To be honest it is a good excuse to get the bonnet open on the Griff and have a play...

Regards

Steve

[Sardonicus]

32 thou/0.8mm will do ya NGK's are always pre gapped so check 1st

[Bluebottle]

Sardonicus said:

32 thou/0.8mm will do ya NGK's are always pre gapped so check 1st

thats the typical setting for NGK's is it the same for Irridium/Platinum whatsit plugs?

[Sardonicus]

Bluebottle said:

Sardonicus said:

32 thou/0.8mm will do ya NGK's are always pre gapped so check 1st

thats the typical setting for NGK's is it the same for Irridium/Platinum whatsit plugs?

Not that typical probaly for the older stuff but usually its .9mm or 1.1mm for their wide gap types, I wouldnt play around opening behond .9mm if using the standard Lucas ign system as you tend to over load the stock ignition module

[ChimpOnGas]

Please be careful gapping iridium plugs, it can be done but you need the right gapping tool before you attempt it or you'll be levering against the centre electrode.

Which is a massive no no

You need the type of gaping tool that allows you to move the earth electrode closer to or further from the centre electrode without ever touching it.

I probably shouldnt have touched them, but with care & the correct tool I gapped my BPR6EIX at 0.9mm and it worked for me

NGK plugs are extremely accurately gapped from the factory, way more accurately than you could ever hope to achieve yourself.

With this in mind & given the risk of damage I would just be checking what they come out of the box set at, & if its between 0.7. - 0.9mm simply fit them without trying to alter the gap.

The extremly thin needle like centre electrode on iridium plugs is incredibly durable in operation but it was never designed to be levered against.

[Sardonicus]

ChimpOnGas said:

Please be careful gapping iridium plugs, it can be done but you need the right gapping tool before you attempt it or you'll be levering against the centre electrode.

Which is a massive no no

You need the type of gaping tool that allows you to move the earth electrode closer to or further from the centre electrode without ever touching it.

I probably shouldnt have touched them, but with care & the correct tool I gapped my BPR6EIX at 0.9mm and it worked for me

NGK plugs are extremely accurately gapped from the factory, way more accurately than you could ever hope to achieve yourself.

With this in mind & given the risk of damage I would just be checking what they come out of the box set at, & if its between 0.7. - 0.9mm simply fit them without trying to alter the gap.

The extremly thin needle like centre electrode on iridium plugs is incredibly durable in operation but it was never designed to be levered against.

Hi Dave, plug centre electrodes should never be levered against no matter what style/design that's really bad practice but often seen carried out

[blitzracing]

Why are you worrying? The required gap size depends on you available HT, the electrode shape, and the effective resistance of the air fuel mix. The HT is all over the place on an RV8 due to one coil and 8 cylinders, as with the mixtures resistance with different throttle openings and amounts of fuel. You really have so many variables that stating it should be exactly .8 mm (or whatever) is really pretty meaningless. You just need the gap to be wide enough to ignite the flame front reliably, and narrow enough to allow a good spark even at high RPM when the coils energy is reduced. Id definitely leave as the manufactures have set to start with and be done with it.