What spark plugs for rb20det?

[Remix-]

Hi i was wondering what spark plugs are recommended to use on an RB20DET, i would prefer standard plugs that are already gapped.

Cheers

[WazR32GTSt]

if you did a search then you would realise that you can use:

NGK coppers part number BCPR6ES these are gapped to 0.8mm from the packet

otherwise BCPR6ES-11 are gapped to 1.1mm

cheers,

Waz.

[Remix-]

What's the difference in gapping make?

[JH32]

if you start upping the boost you gap the plugs to get rid of any missfire that you may feel when the spark gets blown out

[neil_se]

Depending on mods, i'd go BCPR6ES or BCPR7ES if you've got more done. Both 0.8mm gap.

[Boosted Zed]

Iridiums are better and can get already gapped and colder heat range. Either Nippon Denso or NGK and options with heat range from 6 through to 11, factory is 5 but in hotter climate like most of Australia and with more than factory hp 6 or 7 is better and .8 gap if boosted. The Iridiums come 1.1mm gap or .8mm and the Nipon Denso have a tappered U grove earth. Iridiums don't last as long as Platinum but work much better and copper plugs are cheap and don't work well or last.

[WazR32GTSt]

Iridiums are better and can get already gapped and colder heat range. Either Nippon Denso or NGK and options with heat range from 6 through to 11,  factory is 5 but in hotter climate like most of Australia and with more than factory hp 6 or 7 is better and .8 gap if boosted.  The Iridiums come  1.1mm gap or .8mm and the Nipon Denso have a tappered U grove earth.  Iridiums don't last as long as Platinum but work much better and copper plugs are cheap and don't work well or last.

define 'better'...

i was of the understanding that coppers gave the best spark with their only downside that they last only 10,000kms in a turbocharged engine...

[xRHETTx]

Well i went out and bought new BCPR6ES1.1 coppers today for my r32. Fine for about $3 each.

Then went on to try and install them myself, i realised why people go with iridiums - changing the plugs is such a bastard of a job!!

I gave up after 3 hours of stuffing around, you basically have to take the entire inlet piping etc off, its stupid. And all because the coil cover plate thing has a bent bit on the end, so you cant slide it out forwards. Such a stupid design.

So if iridiums cost $20 each and coppers $3, and the change interval for iridiums is 40000km compared to 10000km for copper, thats alot of time saved changing, and therefore workshop costs, if you dont do it yourself.

Im just going to take mine to a mechanic for the plugs in the future. My 2c.

[blind_elk]

3 hours!!! Its a half hour job!

Remove the cross-over pipe (connecting to the throttle body), remove the valley cover (the bit with "Twin Cam" printed on it). That exposes the coil packs, which you can either remove in their "cradle", or remove individually to expose the spark plugs.

Hint - a piece of 3/8" hose fits neatly over the plug (once you've loosened it with the plug spanner) for twirling them in and out of the hole.