I had one of my SAE instructor friends test some of the more popular plugs in a lab with a Ford coilpack, under a simulated combustion chamber pressure, at various simulated RPM fire rates. Take a look at the Denso Iridium's, f()ck!ing amazing.

If someone would like to host the chart, please e-mail me as my FTP is down right now.:o

 

So the Denso Iridium's faired better than the others i take it?? I bought TR 5's that i plan on putting in this week. I'd love to see the results!

 

RPM
1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Stock 16 17 19 20 20 22 26 41 102 168 201
Bosch Plat +4 4 4 6 7 9 11 18 20 27 34 38
SplitFire 17 18 21 28 35 41 55 69 107 194 217 AVG Misfires per Minute over 5 min
NGK TR-6 6 6 8 10 14 20 22 27 33 39 45
Champion Copper 4 10 14 15 21 28 45 101 145 152 299
Denso Iridium 0 0 0 0 1 1 1 2 2 2 2

This isn't going work so well...

 

-----------} james_collins@flexitallic.com {---------------


The chart has a graph on it as well.

I also have a tolulene / xylene mixing ratio chart if anybody is interested.

 

Ok, that's it, where's the best place/price to buy the Denso's?

 

James Send it to me Ill post it ..

Doug

 

Master,
I would like both charts. screwnuts@aol.com
Thank you.

 

Note that each RPM increment was tested for 5 minutes and averaged per the 5 minutes. I.e. 3500 RPM's were cycled for five minutes, number of misses divided by time.

It should be noted that a 3500 RPM cycle test only fires the plug
1750 times per minute, remember this is a 4 cycle engine.

The pressure simulated the volume of our 5.4 L engine with a 10.2:1 compression rato, meaning the boost was "on".

Keep in mind that more testing would have to be done to simulate higher levels of boost, which statisticly would increase the number of misfires.

 

Master Of Pain,
Which Denso's were they,the IT16 or the IT20?

 

IT 20's

One came out of my vehicle. It only had 5 miles on it so it wasen't a tainted sample.

 

 

I got my Denso's from Johnny Lightning... I thought it was a good price. Later I found a place where you can order any qty you need form a distributor... looked at the price per and found that I saved about $5.00 by getting them from Johnny.

There may be better places to get them but I'd rather send it to a supporter of our trucks.

 

Nathan you beat me to it

http://www.svtlightnings.com/sparkplugmisfires.htm

Doug

 

Wow those Denso's really perform, but the NGK's didn't fare too badly, and are far cheaper.

Great test! Thanks for posting this information.

 

I guess it would be to much to ask to test the NGK BR7's against the denso's? I'm really curious b/c thats what I was about to buy.