DCPR8E iridium Equivalent.

[koko64]

Anyone know off the top of their head, the iridium equivalent for the NGK DCPR8E? It's no 4339. No luck with the NGK site searching for an iridium plug by make or model.
Cheers.

[brad black]

dcpr8eix

[koko64]

Cool. I have those as the equivalent of the older bikes plugs. Good to know I can use them.
I actually looked at them side by side, with the obvious difference being the nut size for the plug spanner. The reach looked ok too. I'll see if I have a plug spanner that fits the narrow gap of the head cutaway for the vertical cylinder. It's tight but should be ok.
Thanks Brad.
Cheers.

EDIT: I actually have the DPR8EIX-9 plugs for the old 900s. I'll get some of the others (with the "C") tomorrow.

Thanks again.

[ellingly]

Cool. I have those as the equivalent of the older bikes plugs. Good to know I can use them.
I actually looked at them side by side, with the obvious difference being the nut size for the plug spanner. The reach looked ok too. I'll see if I have a plug spanner that fits the narrow gap of the head cutaway for the vertical cylinder. It's tight but should be ok.
Thanks Brad.
Cheers.

EDIT: I actually have the DPR8EIX-9 plugs for the old 900s. I'll get some of the others (with the "C") tomorrow.

Thanks again.

Fortunately NGK codes are relatively easy to pull apart.
D => 12mm thread
C => 5/8th hex (instead of the normal size for a 12mm threaded plug)
P => Projected electrode
R => Resistor plug
8 => Heat rating (higher numbers are colder plugs)
E => 19mm (3/4") reach
IX => Iridium

Makes it pretty simple to grab iridium versions of stuff; E (or ES) ending plugs are just EIX in Iridum.

[koko64]

Thanks E. So the only difference from the old Monster plug is the hex head size. Hmmm.

[DesmoDiva]

Is there any reason you want to run the iridium plugs instead of the standard plug?

We tried to the run iridium's in my 01 ST4 but couldn't find a matching socket that would fit down in the plug hole.

YMMV.

How old are your plug wires?

[koko64]

Hey Diva

It's for the Hyper. Plug leads are good.

I have the opinion that the Iridium plugs survive dodgy batches of fuel better than the regular plugs. Also some premium fuels here (one in particular really) lead to lumpy running down low and sooty plugs. They may have changed the recipe (again).

Where I'm sometimes taking the Hyper, I don't have much choice for gas. I have filled up at some out of the way gas stations, you know, the ones that are also a post office and grocery store for local farm communities. (Some of the best under the radar wineries, B & B's and cafe's around here are off dirt roads where many BMWs, Mercs and Audis wont go). There is quite a good network of local bitumen farm roads and good dirt roads most people never see. Imo the Iridium plugs are better at burning off any unwanted crap in the fuel.

The DCPR8EIX is the Iridium small hex equivalent of the DPR8EIX-9 as I was advised by the good people here (thanks fellas). It's the letter C code for the smaller hex size (I have an NGK book somewhere). I couldn't find it at all on the NGK website either. I guess they had to bring out a small hex version some time.

[DesmoDiva]

Makes sense.   

[ellingly]

Hey Diva

It's for the Hyper. Plug leads are good.

I have the opinion that the Iridium plugs survive dodgy batches of fuel better than the regular plugs. Also some premium fuels here (one in particular really) lead to lumpy running down low and sooty plugs. They may have changed the recipe (again).

Where I'm sometimes taking the Hyper, I don't have much choice for gas. I have filled up at some out of the way gas stations, you know, the ones that are also a post office and grocery store for local farm communities. (Some of the best under the radar wineries, B & B's and cafe's around here are off dirt roads where many BMWs, Mercs and Audis wont go). There is quite a good network of local bitumen farm roads and good dirt roads most people never see. Imo the Iridium plugs are better at burning off any unwanted crap in the fuel.

The DCPR8EIX is the Iridium small hex equivalent of the DPR8EIX-9 as I was advised by the good people here (thanks fellas). It's the letter C code for the smaller hex size (I have an NGK book somewhere). I couldn't find it at all on the NGK website either. I guess they had to bring out a small hex version some time.

Just remember to gap it, the -9 is the gap in 10ths of a mm . And one has to be a bit careful gapping iridiums, don't want to ruin the precious tips.

Iridiums are way less susceptible to fouling and they self clean if they get a bit fouled (if they're fully hugely fouled then there's no hope). That's at least one reason they're good on 2 strokes.

[koko64]

Cheers. I like the pre gapped version, but alas its got the big hex. On my M900 with Dyna coils and NGK leads the spark is good with that gap. I'll measure the gap of the regular plug. Comes with 0.6mm you reckon?

[ellingly]

Cheers. I like the pre gapped version, but alas its got the big hex. On my M900 with Dyna coils and NGK leads the spark is good with that gap. I'll measure the gap of the regular plug. Comes with 0.6mm you reckon?

Honestly can't remember, I have a really nice vintage champion plug gapping then I check everything with just before I install it (pre antiseize on the threads). 0.6mm was what the EGVs were gapped at out of the box for my mighty period 5 LC though .

[Yogi]

You should gap Iridium plugs with a larger gap than standard. I run mine at 1mm running at standard gap it didn't run too good.
There is an article here at the bottom of the page http://www.ducati-upnorth.com/tech/ignition.php Just google - iridium plug gap ducati lots of info on why you should NOT use standard gaps.

[koko64]

Yep.  Very true.
Cheers.