As the title implies

N3H1-18-100A-9U vs N3H1-18-100B-9U

what is the difference ??? besides the letter

So you know that I am talking about Ignition coils


Thanks

 

The B is used in Series II RX-8's and at a chassis number Change on Series I, I believe from 2007....

HOWEVER, the parts now supersede to the B, so you can use B on ALL RX-8's, ..

What is the difference?, It is internally a better/longer lasting coil.

 

Its the same. Meaning they still dont last very long

 

I cant recall exactly but is that a 3rd generation of the OEM coils? The switch to the 2nd generation was back in '05.

Cheers

Andrew

 

Remember this is for Australian Series I RX-8's, the parts are the same here as the US..

 

N3H1-18-100 Superseded to an A at Chassis # Change JMOFE1031--104511, up to 2006 MY

N3H1-18-100A Superseded to a B at Chassis # Change JMOFE1031--105465, 2006 to 07 MY

N3H1-18-100B is still the current COILS used in production for Series II (09) RX-8's also and late Series I (2007-08 MY)

SO the new coils (B) fit all RX-8's, Mazda US have a locally sourced coils with a -9U on the end of the part number.

 

How do I know which coils I have? I had to order off eBay because no dealer within 100 miles of me had more than 1 in stock, and they couldn't get any for at least 2 weeks... They look identical to the ones I pulled out of my '04 6spd, but they're only marked N3H1-18-100. A few lines down they also have "AIC-1279" "4X07"

Not really a pressing issue, I'm sure they'll work, just curious.

 

I've sold the B before for the first generation cars. I don't recall a physical identifier other than the box had the new number on it. The A is still cheaper than the B and I don't know if there is improvement to the B.

Paul.

 

I keep getting the A version.

maybe next time I will get the B.

but if they superseded the part already I guess I will get a B next time no matter what.

Current coils have about 1K miles on them, brand new, A version. No more misfire. Lets see how long it would last before I see misfire.

 

My dealer put in two new coils today on my 2004. They were the B version.

 

I found some new OEM coils in my garage. They are part #N3H1-18-100A-9U. If nothing changed in the design of the coil as compared to the newer N3H1-18-100B-9U version, can I assume I could use them since they are brand spanking new?

Ash you mentioned it is internally a better/longer lasting coil, but also mention if related to a chassis VIN change. So what is the ultimate answer? Paul seems to think there is improvement to the B.

 

Just curious if over the years anyone has noticed the difference yet. The A is still cheaper, so I'm leaning towards those if the B isn't an improvement.

 

as of today right now, Mazda USA has no A coils, and they have the same list as the B coils anyways, $80.29 each.

 

I've run A's, B's and Autozone replacements. Currently running B's. I see no difference in the butt dyno, no significant change in starts or fuel economy between these B's and the A's or the autozone reps.

There may be a difference but it isn't particularly noticeable. Replacing excessively worn coils with fresh ones, regardless of the P/N is going to be an improvement over what you had.

CPT Obvious signing off.

 

Mazda OE Ignition Coils...Updated