DENSO spark plugs - more HP ???

[warren]

Logan & All,
DENSO makes a IT20 colder plug thet will fit our MM's with the Reinhart Chip.
They say it will free up more HP. Some tests were done with Cobras and it produced more HP. The electrode is much smaller and the spark kurnel is alot larger.

Any thoughts ???

Warren B. :rolleyes:

[FordNut]

I don't know about the MM, but I used to run ND plugs in all my motorcycles. Anything else would foul in the 2-stroke dirt bike but when I changed to ND I never fouled another plug. Hotter spark, I suppose, because the plug was the same heat range as the NGK and Champions. I thought since they worked so good in the dirt bike I would try them in the rest of my vehicles and ran them in my street bike, MkVII w/5.0, and F150 w/351W (before I changed to a 460). They worked great. When it got time to change plugs again, I could never locate the ND car plugs again. I had bought the first set at Pep Boys and they quit carrying them.

If they were readily available, I'd be running them in all my vehicles. Where do you get them?

[Logan]

I've run Denso's before in my Lightnings, specifically the IT20's you're referring to and yes, they're great plugs. Expensive as all heck, but great plugs. In my Lightning at least, I found my idle smoothed out and they were worth 2 ponies on the Dyno...

[FordNut]

Just a thought... Since I'm running a DR delta chip, maybe the colder rating of the IT20 plugs will help make more power at the 93 octane setting but the better exposure of the spark will reduce the tendency to foul at the 91 octane setting. Hope so, anyway.

[Accufab Racing]

Denso Iridium plugs, the hot set-up. They are the only plug we have seen that can stand up to 42# of boost. We have used them exclusively for years in the race car and the street cars. We are a Denso Dealer and we stock them. They are not cheap. $11.99 each.

[Macon Marauder]

When I talked to Dennis last week, he mentioned that he feels the Desno plugs in the kit he sells are worth about 10 HP.

Hope he's right...

[MassMarauder]

I recently bought my "kit" from Dennis. He is now offering the Denso's and highly recommends them.....so I bought them. I will be installing them (and the chip) next weekend come rain or snow.

[SergntMac]

Originally posted by Macon Marauder
When I talked to Dennis last week, he mentioned that he feels the Desno plugs in the kit he sells are worth about 10 HP. Hope he's right...

I have a set of Denso IT20s sitting here waiting for dyno testing. I'm also waiting on other stuff to install and test before that, but I will have "before" and "after" pulls to show you before all this snow melts.

Meanwhile, whether it's 2 Hp or 10 HP, proven in testing or not, my research into the Denso IT20 shows they are the best spark plug for our application. I'm mostly a "numbers, not opinions" guy, but inside that, numbers are just numbers too. My chief concern is a solid, clean burn through the power spectrum, from idle to redline. IMHO I think the Densos will do the job. The rep of this product, as well as the reps of those who swear by them, is good enough for me, and I say it's a no-brainer, despite the costs. I expect that running the test will just nail down some numbers we can toss around. Read more here, if you're still looking for facts;

http://www.denso.co.jp/index-e.html

[jefferson-mo]

Thanks, Sarge.................cool image there:banana2:

[WolfeBros]

Anyone know the recommended mileage interval on changing the Denso plugs ? I have never used them before but will do so now.

[warren]

I understand that we should change them(IT20s) at 30k, check at 15-20k- some will go to 50k. Talked to Erin Brock at Denso
( http://www.densoiridium.com/index.php )and he also said the
smaller center electrode cools alot faster and this could help keep us
here in Calif. ie. 91Oct. Gas, away from pre-ignition. It goes without saying these plugs produce more power. Be sure to check out the installation inst. on their website. Care must be taken when changing the gap etc.
Dennis Reinhart is now selling them at a good price so you can order them from him.

Warren B.:D

[martyo]

Warren: Great Link! Thanks for the info.

[WolfeBros]

Thanks Warren. :up:

[RF Overlord]

Originally posted by warren
I understand that we should change them(IT20s) at 30k, check at 15-20k- some will go to 50k.

Dennis Reinhart is now selling them at a good price so you can order them from him.

The Denso site's look-up chart for the MM says we should be using IT16s, not 20s...are their heat-range numbers backwards (higher # = colder plug?) :help: ?

**Nevermind...I looked a little closer...the 20 is colder than the 16

Also, the link Dennis has for Iridium plugs looks like a FoMoCo number, and it only takes me back to the top of the page...more :help: ?

[Accufab Racing]

The DENSO book specifies IT16, just like the 96-01
Cobra. Gap is .050.

From hottest to coldest, the DENSO numbers are 9, 14, 16, 20, 22, 24, 27, 31, 34 & 37. Our rule of thumb is to drop 1 heat range colder for every 8# of boost or 50 HP of nitrous.

[SergntMac]

All I can add here, is be wary of the web page you "plug" into. There are many, many Denso resellers world wide, reporting stats and "facts" all the way back to 1988 engines and automobiles. Some of the "testimonials" I've run across, are very questionable, in terms of accuracy. If I see another "Jim Shued" reporting in with his K-Car stats, I'll point to that here.

Whether it be a snowmobile, two stroke rice bike, or a Black and Decker chain saw, Denso has been in the spark plug business as long as I've been breathing, and rightfully so, you should expect to find a lot of 411 on Denso plugs, on the web today. Do your searches carefully, know what page you're reading before you buy into that specific 411 as being the "absolute truth." on this.

For us MM owners here, I'm going to be testing the IT20 by the end of this week. I'll be back with the "before" and "after" dyno reports on these plugs for you to consider as well. Stay "tuned," eh?

[nomad]

Thanks for the heads-up Sarge.
Unless you post some impressive numbers with these plugs, I'll stick
with the plugs Dennis sent with chip.
At least for now. I certainly can't complain with my performance, and driveability.

[RF Overlord]

Exact-amundo, nomad...

[SergntMac]

Agreed, gentlemen. My dyno research will prove two things to me, in my own mind, and I intend to prove/disprove exactly that here. Prove that;

1) The Denso plugs are, in fact, THE path to follow for us MM owners, in terms of performance improvements, and "bang for our buck."

This is always my chief concern, what is real for us MM owners, and what is only "www." hype. That said, I must also agree that when Dennis advised us last fall to adopt the colder FMC plug, that all he had tested and proved (at that time), was that the colder FMC plug was the path to follow. Now that Dennis has had time (and opportunity) to test more samples and reflect on his previous advice, a switch to the Denso plug is not as much alarming as it is comforting, in an "upgrade" way of thinking.

2) Reinhart knows stuff about the MM, and possibly the truth about Denso plugs. He has been steering us MM owners on a straight path with his advice, all along, and he's not tripped himself up yet. What does that mean to us MM owners? It means good, and we should listen for more, yes?

Now, I know that you guys here, (and rightfully so), should take my word on this topic as just another "web opinion," I would too.

But, I am backing my word with independent testing of the MM and suggested DR upgrades, and I will report the real truth on this, as I get it, no matter how the chips fall. Whether it be Denso plugs, 4:10s, Chips, K&N filters, drive shafts, whatever, I am making changes to my MM, and I will tell you the truth about these changes, as I find them proveable. If Reinhart is bogus, I'll say so. If not, I'll say that too. I've told him that, and he said "please do that."

Okay...Again, stay "tuned," eh?