I know the stock gap is 1.1mm (0.44 "), but i have bought Denso Iridium IK22 and HKS S35I (same as IK22) and the gap is 0.8mm (0.32 ").

I gave a call to France Denso dealer, he ask to the Japaneese engineer and he told me let the gap to 0.8mm on Denso IK22. But when he search for the part number for Japaneese Integra Typr R (same engine as our european) he saw Iridium VK22 and the gap for this plug is 1.1mm !

I thought the gap for plug is no matter the plug but the ignition amplifier and module capacities.

So why is there two differents gap for one car ???

I think the IK22 plug is a generic plug for many cars but now they produce a specific VK22 plug with the good gap.

I took my old IK22 and regap them to 1.1mm, i will dyno the car on this friday to verify if there is a HP difference between the same plugs but at different gap.

I will post the results.


Modified by sylvain at 5:10 PM 10/8/2004

 

It should be 1.1 mm. You have to regap it.
Or buy the NGK IFR7G-11 Iridium version.

 

Thank you, and do you think there is a power engine output difference between those 2 gaps ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sylvain &raquo;</TD></TR><TR><TD CLASS="quote">Thank you, and do you think there is a power engine output difference between those 2 gaps ?</TD></TR></TABLE>
Yes, bigger gap = bigger spark, but needs higher voltage.

The GSR uses 1.3 mm for some reasons.


Modified by DutchITR1689 at 5:53 PM 10/4/2004

 

So i just come back from Dyno:

Dyno: Bosch FLA203, SW version: 3.71.0

With 1.1mm GAP:
Wheel Power: 183.3whp @ 7880rpm and 195nm at 7090rpm
Engine Power: 209.2hp

With 0.8mm GAP:
Wheel Power: 184.4whp @ 7990rpm and 194nm at 6270rpm
Engine Power: 209.6hp

The spark plugs are exactly the same: Denso Iridium IK22, just regaped.
Dyno on the same day at 2 hours gap.

I will keep my 0.8mm because there is no differences.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sylvain &raquo;</TD></TR><TR><TD CLASS="quote">
I will keep my 0.8mm because there is no differences.</TD></TR></TABLE>
There is more than just power output. You have a smaller spark now, so in some cases you can get a misfire. In rich or lean conditions, I don't know which one.

 

Did you notice any temp changes or other changes?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DutchITR1689 &raquo;</TD></TR><TR><TD CLASS="quote">
There is more than just power output. You have a smaller spark now, so in some cases you can get a misfire. In rich or lean conditions, I don't know which one.</TD></TR></TABLE>

The curves are exactly the same !!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">Did you notice any temp changes or other changes?</TD></TR></TABLE>

Nothing !!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sylvain &raquo;</TD></TR><TR><TD CLASS="quote">

The curves are exactly the same !!!!</TD></TR></TABLE>

I know, but you can't see everything on the curve. Some things you'll notice after some time. http://www.ngksparkplugs.com/t...ry=US

" Insufficient spark plug gap can cause pre-ignition, detonation and even engine damage. Too much gap can result in a higher rate of misfires, loss of power, plug fouling and poor fuel economy. It is always best to check the gap against the manufacturer's specifications.

Another consideration that should be taken into account is the extent of any modifications that you may have made to the engine. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004" for every 50 hp you add). However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005". "

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DutchITR1689 &raquo;</TD></TR><TR><TD CLASS="quote">

I know, but you can't see everything on the curve. Some things you'll notice after some time. http://www.ngksparkplugs.com/t...ry=US
</TD></TR></TABLE>
I'm agree with you but if you go on the Denso website they say do not regap an Iridim Denso plug because the special V ground eletrode.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sylvain &raquo;</TD></TR><TR><TD CLASS="quote">
I'm agree with you but if you go on the Denso website they say do not regap an Iridim Denso plug because the special V ground eletrode.</TD></TR></TABLE>

Because they are afraid you'll break the center electrode or something. The V ground electrode is very difficult to bend.