I just got my Denso IK22 spark plugs in today. I noticed that they are a little bit shorter then the OE or IK22L plugs. Will the short plug make a difference in a bad way? I haven't heard anyone having issues on this plug.

Also how is everyone gapping these plugs? Many years ago (like 12) I tried to gap an iridium plug with on of those cheap sh!t auto zone disc rappers and broke the tip. Denso states this plugs comes gapped at .8. I know some of you are running .5.

 

Man no one has any feedback?

 

I just installed mine yesterday. They were exactly the same size, recheck your part number. Part number IK22/5310. They come pre-gapped at .8 mm (.032 in), I didn't gap them, the engine is smooth. The only real way to gap to optimal specs is using a dyno.



Gap, seems to be a lot of mixed theories:

https://www.fitfreak.net/forums/fit-...-plug-gap.html

https://www.fitfreak.net/forums/2nd-...installed.html

https://www.fitfreak.net/forums/2nd-...ark-plugs.html

 

All it does is move the spark event higher into the combustion chamber allowing the flame to travel in a downward direction to produce a better a more through flame front.

Only down side I can see is a slight reduction in compression ratio. Very very slight.

Here is what the stock verses ik22 plug:
HONDA FIT CYLINDER HEAD PORTING - Skunk2 Racing

 

my denso22's are gapped at .050, they are the PRK22 plugs for a Honda S2000.

Im at around 20k miles on them, 32k on car. Im planning on regapping to .044 around 50k miles on car. I dont want to stress the coilpacks too much.

 

Yeah they are #5310. I just measured the OE plug compared to the Denso IK22. The OE measured 2.1mm longer.

I gapped these at .05mm today from the stock .032mm. Hopefully this will help cut some of the KR down. Going to datalog the car with the plug switch in a few hours.

 

you gapped at 0.05mm? that is 0.019685 inches. MUCH too small.

If you are stuck in mm measurements from your tools, try gapping to 1.1mm at least. (.043 or so inches)

 

From what I have read about you want (inches) .026-.034 for boosted gap and na should be around .044-.055

 

Haha I goofed that's .05 inches.

 

it happens. you should like that setting. Might want to follow my route and down the road regap to smaller to kinda help save the coilpacks as they get older.

I really hope Honda "screws up" and gives us a better factory upgrade with the new fit. I think our motors could benefit from stronger spark events!

 

I am going to make a custom coil pack cover to help reduce the heat that is getting absorbed for the headers. My buddy is going to fab up a cover that I will wrap with DEI heat tape. Was thinking aluminum would be best since it's light and would handle the heat better then steel. This should help the coil last a bit longer under the heat and more stress of racing.

 

there is a factory heatshield already.

 

I have headers. The factory heat shield is gone.

 

I was looking into 2015 spark plug replacement for the stock 2015 Honda Fit (LX CVT to be exact but it shouldn't matter). I read an Oscar Jackson article and the dyno sheet showing 2-3whp extra and people saying that the power they felt was 'smoother' or that the Fit did not need to downshift as often. Some posts stated they had noticed slightly better mpg.

I was cross referencing the 2013 Honda Fit OEM spark plugs with the 2015's. They do not seem to be a direct comparison. From the 2015 owner's manual, it says the OEM spark plugs are these -->
NGK DILZKAR7C11S
DENSO DXE22HCR115

So I went reading some more about the stock 2013 spark plugs at this site --> Honda Fit Spark Plug - Free Shipping - NGK, Denso, Bosch

If you read the specs of both the 2013 NGK and Denso plugs, it says that they both are 'iridium-tipped' spark plugs. I thought that was the main purpose in purchasing the IK22s. And in purchasing an Iridium tipped spark plug, you get all the benefits of a better burning fuel or flame front, better spark using less energy, smoother running and better mpg. All due to the iridium tip technology.

So, am I missing something?

 

iridium, platinum, and copper are all good plugs. the only difference in real world feel is the coppers will tend to last less then a 100k miles no matter what you do. It is copper.

The main thing with going to 22's is the colder firing temperature. This means that the spark plug is a cooler hotspot, and less likely be the cause for detonation when the plug isnt supposed to be firing.

Many newer cars will see benefits of colder plugs and higher octane as a combo due to the better heat control, and the car's ecu allowing more advanced ignition timing, translating into more midrange torque, smoother higher rpms, and less chance of stalling at very low rpm

 

Thanks 13fit for the explanation. However, Denso IK22 selling point is the Iridium technology. You could go to a colder spark plug range than the stock OEM plugs and simply put in higher octane if Iridium is a moot point. Am I correct? I've only went with a colder spark plug when running a 75hp or higher shot of nitrous or running higher than 5psi of boost on an N/A engine (or both ).

But for a stock Honda Fit, from what you are saying, all the guys had to was go with a colder range spark plug and higher octane (Since the OEMs are already iridium tipped) and the ignition advance would compensate for more hp/torque?

 

If you want a good quality plug, go for the stock sparkplug for a Honda S2000 AP1 (2.0L model)

I run these plugs, they are PK22PR11 Densos, part number 3265 at Autozone. They are double platinums

EDIT I see you said you went to a colder plug during power sprays lol. Not a bad idea. n I recommend finding a set of Denso 26's if you intend on spraying this Fit motor. The huge stroke and tiny bore unfortunately make it a bit more risky on spray, even if Honda made these mtoors very strong. Bad rod angle is the culprit for the risk

 

Rollerboots666-
Just want to know what the part # of the ik22 plugs you bought. My research tells me its Denso #5310. Any feedback/thoughts on them?

 

Havent used them. my 3265's were still working perfectly at 44k miles.

Highly recommend a valve lash adjustment before changing plugs (or during of course).

These motors come factory with crap lash settings for hotter exhaust for better emissions. It is why nearly all owners have found the exhaust side to be tighter than the intake.

Someone in the higher offices didnt realize that LESS fuel used (with proper lash settings) means less emissions, rather than worse gas mileage but slightly less toxic "emissions"

 

Recently installed the Denso IK22 #5310 (indexed) on my 2010 Honda Fit Sport Manual USA spec.


Here is the cheapest price I could find (bought 6 to use 4 for indexing):




I can sell you the 2 of mine I didn't use. They have index marking on them and were screwed in than out as they didn't seat towards the intake port. These 2 are $6 + shipping.