ASH8

I know this is not ground breaking news, BUT, I could not find an easy reference here on allowable or recommended Spark Plug GAPS for Trailing and Leading NGK plugs.

When it comes to specific Rotary Models, only use what is recommended for the RENESIS, don't try Frankenstein plug combinations from other Rotaries.

The GAPS are as follows for RX-8 Spark Plugs..

Brand New NGK Spark Plugs
1.15-1.25mm (0.046-0.049in)

Used Maximum GAP
1.50mm (0.059in) Leading Plug
1.40mm (0.055in) Trailing Plug

I do not suggest or recommend the manipulation or bending of ground strap to close or reduce the "GAP" in well used (old) Rotary Spark Plugs.

Some may do it, but IMO it is not worth the risk of weakening tiny weld joints.

So if your plugs are close to the Maximum Gap or over it, consider replacing them.

Acykj424

when i replaced my spark plugs i was told they were ready to go?..... i own a 04 rx8, ive been having idle issues im kinda new to the forums

SARRAS

I think 2 things may also be relevent - they are an Iridium plug and general instructions on those is 'Do Not Gap' as the centre electrode is so fragile to force. So all Iridiums are pre-gapped as such.

Secondly, since these plugs ONLY fit our cars - what other gap would they be set for!

laythor

do not gap iridium plugs

olddragger

iTrader: (3)

the denso iridium plugs have a much stouter ground straps and can be gapped --carefully.
Some have had really bad results in gapping the ngks, but i still do, but only one time when they are brand new. I only barely touch the center electrode. You do have to be VERY careful and gentle. I do look at the grounding strap with a magnifying glass afterward.

ASH8

Hi Denny, I have a few Denso Iridium Racing Plugs, they are a very well made plug, 0.4 mm Ir electrode tip.

I have only just received them, they warn about using any thread lubrication?, the thread and plug body is Very shiny almost like a full chrome job...highly polished nickle plate?..

Got to go to bed now..Good Night ...

I have some good new info for club members soon...

xsnipersgox

no longer correct, their quality has went down, check and gap if necessary.

Loki

iTrader: (1)

I wouldn't touch it, the electrodes are too fragile. You'll get your gap followed by a loose electrode going for a walk in your engine. This hasn't changed since the original post

TeamRX8

iTrader: (25)

edit: meh, crummy joke ...

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