We have ethanol here too.

IK24s are on the way. Should be here by Wed. If it's not raining, as predicted, I'll have them in soon after.
I have an auto-x event this weekend so I'd like to have them done before I get busy with that.

 

Here's a pic of my IK22's after 20K plus miles.


Could this have caused a severe engine misfire under heavy load?

 

I actually took my IK20's out this weekend and replaced them with IK22's.

One of the IK20's (cylinder 3) actually had one of the iridium tips totally worn down, it was gone. That couldnt have been good.

When i replaced with the IK22's, I left the gap out of the box. I didnt try to regap them as the iridium tips are very delicate and easily snap off.

Right off the bat the MCS felt a lot smoother and more powerful down low. Definetly that broken electrode was a problem. Very happy customer right now.

 

before putting them in. I've found some interesting gapping "out of the box". They are adjustable, just be careful and use a wire gap gauge.

Matt

 

I actually checked them all to make sure they were all the same before installing.

Ive noticed a few in my day me WAYYY off from the other 3 "out of the box"

 

Might not have helped. That is definitely the conditions where it shows the most.

 

Mine were better than sanddans. A stock coil may be why, although I don't know that sanddan's coil is not stock . With the Denso's, never saw the need for more coil, just better wires. Can't wait to see what you think after the weekend........

 

Did wires and a coil. Early on.
Always ran them in the past so I figured, what the heck?

I'll agree with the other posters. Found some variance with my IK 20s and the IK22s. Expect it in the 24s as well. No biggie.

The downside is we have a cool front moving in and temps will drop ~20º so it'll make impressions and data kind of useless.

It is VA though so it will get hot again as least once more before winter.

 

Just wondering, does outside air temp really affect the temp of the combustion inside the cylinder? Seems unlikely to me. I thought the term "colder plugs" meant that plug cools off faster between power strokes, so that the incoming fuel/air mix doesn't ingite prematurely due to a "glowing" plug. Seem like cold plugs should have just as much advantage in cold weather as hot.

 

Not to worry, I ran the IK24s in 103+ weather. I'm looking foward to cooler weather just to see what I've got ( never got out of the low 60s & rain all day yesterday ). If there is no cold start problem, which I doubt will happen, these will be the DD plugs of choice. If the plugs fail, it will be in the cooler weather. That nice cool air makes good power & your right foot can make things fail a lot faster........... Hope you have a great weekend with the new plugs

 

Remember temp is related to density. And then everything gets compressed and heats more... Also, our cars run "on the edge" with knock sensor induced timing retard straight from the factory! So anything you can do to cool the charge will pay off. Supercharged! by Corky Bell has some approximate equations you can use to see how it all works out.

Matt

 

I have a MSD coil and Magnacore wires, have had these since installing the IK-22's.

Two weeks ago I experienced misfires bad enough to send the ECU in limp home mode. This was during a open track day and occured during the first 10 minutes of the first session. I thought I had gotten some bad gas but even after adding some octane booster I still experienced the misfiring under load.

Maybe due to the plugs?

 

Read post #40. I'm all thumbs with computers

John Petrich in Seattle

 

What was intended was that any noticeable change be it seat of the pants, IATs, MPG, etc will be skewed by the fact that it will be noticeably cooler when I change the plugs compared to my current tropical conditions.

I could always wait until the inevitable heat returns but I'm not a real patient guy.

 

Sandan,

Might have missed the information in an earlier post, but what plugs were you running when you misfired at the track and what was the spark plug gap? Also, were your spark plug wires tight on the coil and tight on the spark plug?

I had the same thing happen to me once, a long time ago. Thought that I'd lunched the engine, but, no just limp mode from the ignition misfiring a high speeds. Turned out that my stock spark plugs (at the time) were misfiring due to a combination of deposites and the stock 0.062" gap. Installed IK-22's and then IK-24's and then IK-31's(?)and back to IK-24's again with a nominal gap of 0.032" out of the box. For the last three years of track use, never had a repeat of the misfire or limp mode again.

Again, were your plugs old and dirty, gapped widely, or were your plug wires loose?

Regards,
John Petrich in Seattle

 

Geez! If those are approximate I'd hate to deal with exacting.

Very good book

 

get a Crey!

Matt

 

Actually, I have at least been in the room with one.

An old Cray X-MP like this one.
The cooling tower was backlit and looked very sci-fi in it's dimly lit room.
I was fixing one of the support system computers.

 

Go with NGK

 

Sid,

Did you ever get the appropriate NGK part numbers (same heat range as IK-24s)?

 

What part number?
I got these 2 crossover numbers for IK 24s

R7433-8, BKR8EIX

Used this handy application

 

Thanks. I had the BKR # but wanted to be sure.

Have you bought and installed them yet?

 

Actually I didn't find this utility until I had already ordered IK24s

 

OK.

So did you install the IK-24s?

I'm probably gonna do this (one higher heat range than IK-22) for my modded MCS, but guess I just want more affirmation...

 

Not supposed to be here unitl Wed.
A couple others here are running them and have had no issues including track time. Works for me.