All my mods are in my signature, I have 1 heat range colder plug in my engine now, but I do no recall what type of plug I put in, I want to replace them soon though because its not running and idling as good as it has. No concern, just maintenance. What do you recommend?

 

Hi. Hands down, Denso Iridium:

http://www.troyerperformance.com/cgi...catalogno=IT20

Denso's site:

http://www.densoiridium.com/index.php

With your mods a colder heat range than the standard IT-16 may be in order. Ask Mike.

Cheers
Bubba

 

Ok I will wait for Mikes responce. Thanks though, I didnt know he sold plugs!

 

Hi Built54,

I agree, go with the Densos - now normally the stock heat range would call for an IT-16, but you have added enough power to drop it down 1 heat range, so use the IT-20's - they are the same price, so no difference there, this is strictly a matter of the appropriate heat range, and that would be 1 heat range colder than stock - so Denso IT-20's it is.

 

mikey i plan on doing the aef intake-i'm nearing 30k gonna do o2's and plugs- should i go it15t's or 20's since my van is so heavy and i work it?- thanks-phil

 

Hi Phil,

Good question - by the books, Denso calls for an IT16 for your engine - however, the Denso's firing tip burns pretty hot, probably hot enough that you could use an IT20 if you like.

It really gets down to a matter of idle quality, like always - one step too cold on a plug gets you some mild idle misfire.

In your case, it's probably a bit easier to change plugs since you can just yank the cowl cover off and the motor is right there if you wanted to change back to a IT16 if you didn't like the idle quality.

I think you could probably go with the IT-20's and be fine, it's not a bad idea given the EGT's that engine sees - your EGT's, I'm guessing, are probably going to run in the neighborhood of 50-100 degrees higher across the board compared to the average F-150, and that thing doesn't have quite as much in the way of air circulation under the hood like the trucks do, either - so the IT 20's will probably work just fine in your case.

Lord knows it's a heavy pig that gets leaned on, and we'll never take down our picture of that thing on the dyno here.

 

Ok, Im going to go with the IT20's. Would I benefit any from better coil packs?

 

Im ordering them from you mike, should i gap at 34?

 

Well I got them today, It didnt register with me untill i got them today... $10 a plug!!! wow these things must be good lol! still would like to know the gap... im thinking 34

 

Hey Built;

According to Denso, the gap should be 0.050, non-boosted application.

Here's the gapping tips:

http://www.densoiridium.com/installationguide.php

Also , elsewhere on the site are the gap specs - use the product finder to select your truck ...

Cheers
Bubba

 

Thanks, but I think the gap is smaller for 10.5/1 compression... could be wrong

 

HI!... I'm running the AUTOLITE AR-93's. They are two heat ranges colder than stock. I had the DENSO's and hated them. Wore out just as quick and 4 times the money. AR's are like $25(CAN).

 

Actually, we have found the Denso's to be a far superior plug to the Autolite AR series - they fire hotter, quicker, require far less voltage to fire, and are better in every way - unless you are spraying nitrous, in which case the Autolite AR series makes for a *great* copper-based plug - otherwise, the Denso's are fine, and will easily last 50K miles or more - we've done that many times on our customer's vehicles.

Also, for Built54 - the gap recommendation on the Denso's really doens't need to change just because you have 1 point higher compression, stick with the stock gap is what I recommend - and good luck!

 

Wow... I thought I recall you telling me one time to do a gap in the mid 30's ? denso says to gap at 50

 

i'm running NGK