c32used

Ok this is something the owners manual doesn't say anything about so I wanted to ask the infomative members here...I was wondering when the Denso Iridium IK20 are supposed to get changed?...and I seen a member gap them to (CORRECTION).0035 when the OE spec shows .0039 is there and advantage to that gapping?

ohlord

oem gap should be the same as the non amg 320 engine .039
http://www.ngk.com/results_app.asp?AAIA=1416912
we go 100,000 mile,your Quick motor someone with the interval amg will chime in.
enjoy the beast

MRAMG1

Hey used:

You NEVER want to INCREASE the gap on any forcedinduction motor. ANY form of forcedinduction causes a GREAT increase in cylinder pressure which makes it MUCH harder on the spark to jump the gap. In my stang, stock gap was .050, and recomend gap, with supercharger was .035. Some blower manufactures actually recomend gaps as small as .030, unless you have an aftermarket ignition system, which provides ALOT more energry at the plug to jump the gap.

As far as changing them, unless you drive a gizzioln miles, I know I will not be changing mine during this decade

See yeah

c32used

Thanks for noticing my incorrect OE gap spec Corrected now

c32used

I got it wrong its .0039 brought down to .0035. Will this work on our FI cars?

MRAMG1

Hey used:

A tighter gap has many gains on ALL forcedinduction cars, I could write a thesis on it here, but would suggest to look on line for all the engineering details, or PM me

Yeah, dropping it a little has a good effect on both the ignition system, and lessens the chance of a blow out, spark that is. Since our little sixs use two plugs per cylinder, I can't posibly see ANY draw backs on narrowing up the gap a little, and only see potential gains. One of the reasons for a BIG gap is to allow for a better flame propagation. Since we already have two, I can't imagine how tighting them up alittle, .0004, could hurt this. Plus as I mentioned it will have the added effect of putting less strain on the coil backs, ie less amperage through the coils because of reduced energry needed to jump a smaller gap.

Oh well, have to run used see yeah

c32used

Very interesting to know....thanks alot! I wanted to replace mine already even though I don't need to and wanted to try this gapping to see if it helps in anyway...

FrankW

i changed mine at 80k miles. the old one looks perfectly fine, but i changed it anyway.

neihouma

You lower the gap on the spark plugs because the boost is blowing out
the sparks, which means the ignition system is inefficient. I remember on
my M3 turbo at 19psi I would run .0027 gap with a MSD ignition, and on
my IS300 Turbo at 17psi I would run .0029 gap with a MSD ignition.

The bigger the spark (gap) the more power it would make. Unless the C32
is hitting over 25psi, I wouldn't go that MUCH lower than the stock gap
(.0039). And after consulting with a few friends who runs high boost (30+
psi Supras) they told me to try .0035 gap. In a 2-3 more months I'll check
my gap, at six months I'll see how much the grap grew, and that'll tell me
if I need to go higher or lower than .0035 gap that I began with.