Ok everyone i jsut bought a set of Denso Iridium spark plugs they are pregapped at .044. I read that the 350z spark plug gap is .043 is this true. I just want to make sure I gap my plugs correctly.

Thanks Glen

 

leave the gap as is

 

+1

You don't gap Iridium's.

 

What about a turbo application ?

 

http://densoiridium.com/installationguide.php
Here you go!

The proper spark plug(iridiums especially) gap measuring tool is feeler guages


Do not use this!

 

wrong! nEVER gap iridiums, they spark bigger, so that .01 diff of gap compared to stock .43 is irrelevant

NEVER GAP IRIDIUMS!!!!

 

Jinsei,
Where do you get your Info ? And what is your Professional Experience ?
Denso talks about gapping on their Own Website........ per beddow
Are you saying the Manufacture is Wrong?
Do you know more about Denso that Denso ?

 

within +- .01 you do not need to regap. but you always want to double check the gap. sometimes can be off when they arrive.

 

The largest NGK plug distributor in the country prints "DO NOT GAP IRIDIUM PLUGS" on all of their invoices. We have had iridium tips fall off on supras becasue they were gapped.

 

If gapped properly its no different than gapping a standard plug.They break due to improper technique.Why would someone think they could not gap a Iridium spark plug?Tell me why you can't please.The thing is people in the past have gapped them using prying techniques had the tip break off, out of the motor or in the motor.Also in some cases they just break off in the motor with no gap adjustments.AC Delco make really crappy quality iridiums in the C5's that owners take out as soon as possible! Now it's you can't gap iridiums,no you can if you do it properly. If NGK states not to gap THERE iridium spark plugs thats gotta be them covering their butt when some idiot prys on the iridium electrode, because they are so fine they crack or snap right off.If one is not trying to achieve something other than a plug change,then just change the plugs.Give the gaps a check to see if preset gap meets manufactures specs,and to make sure they are all within .01 of each other.Me on the other hand I like to try different gap setting for my vehicles,gives me something to do while I'm bored and I get to keep an eye on what is happening in the cumbustion chambers.
Some of you will not agree with my post and your opinion is just as important as mine,but we are talking about Denso Iridiums in this thread.If you can show me something from Denso stating not to gap their iridium spark plugs please post it.Other than that its false info your passing on to lots of people.
Eric

 

good response

that being said, leave them alone

I've gapped Denso iridums a million times...I have never ever ever ever had a tip break. If I were a distributor, I would tell people not to gap either...who wants to deal with calls from yahoos who fancied themselves "tooners" and starting playing with things. On the other hand, try running that gap on a big boost car and see what happens.

YES they can be gapped....for this instance, the preset gap is more than fine - just double check them before they go in to ensure gap is within .01 of each other

 

The iridium electrode is so brittle that even lightly touching it can break it or weaken it. So--with a feeler gauge you can't really get an accurate gap without doing damage. Trust me--I broke 3 electrodes a year ago and one of the ones that didn't break actually broke off in use. This year, they went in as is and the engine is running better than ever.

 

I wont break it just testing the gap with a feeler gauge will I?

 

Thats a good question because appearently it can be done.There is no way to answer yes or no.What I would do is figure what you want your gap to be,use that size feeler to check the gap.Don't let the feeler slide in between the 2 electrodes but rather gently let the feeler settle on the ground electrode then slide the tip of the feeler up to the center iridium electrode.Just be careful do not go jamming the feeler in there if the gap is bigger the feeler should slid in between them.If you want to change the gap use the Denso instructions and take your time because it will take alot of patience or luck to bend the ground to say .02+/-.

The values of iridium look great it's the hardness value that makes it easy to snap if not carefull.One simple drag from a feeler guage could cause a vibration that snaps or cracks the fine iridium electrode.Just make sure they are within .01 of each other and install those suckers.Your still N/A correct,if so do not mess with the gaps if you do not have to like Z1 Performance recommended.

 

I measured the gap they are all perfect. Everyone one of them was .044 like they claimed they would be.


Thanks Glen

 

Cool deal,I was like this Now I'm like
Eric

 

Here is a tip. When I changed mine out I had one 1 that was off. I checked the gap prior to install, put little piece of paper towel in the socket then it will hold the plug in place so you dont bump it against anything , because if you hit it on something when you install your gap will be off. It worked like a charm. paper towel has many uses.

 

Yea as long as you are gentle with them your fine. Im just happy i did not have to gap them.

Sincerely Glen

 

Always check plug gap, regap if needed. Always use proper techniques for type of plug being installed. A quality spark plug socket comes with a rubber tube inside to grip metal end of plug...many remove it for whatever reason resulting in damaged plug when reinstalling. Leave te tube where it is. ...plug wont fall off...simple.

 

no.