Iridium automobile spark plug question.

AX-O · #1 01-13-2010, 10:58 AM

All,
I did a search and found some information regarding automobile spark plugs. I am trying to figure out what automobile spark plug to use with my Pmags. Their book says that NGK BR8 ES and NGK BR8 EV have been used and work ok. I spoke with Dayton last night and he told me to use the Iridium type NGK BR8 EIS. I can?t find that plug. I can find the NGK BR8 IX or NGK BR8 HIX. Do you guys have experience with any of those two plugs? Thanks for any help or guidance.

N941WR · #2 01-13-2010, 11:02 AM

Axel,

My P-mags fire the NGK BR8 ES plugs with no issues. At 100 hours I spend the $16.49 and replace all eight, even though they don't need it.

AX-O · #3 01-13-2010, 11:55 AM

Found this on the web.

http://www.ngksparkplugs.com/docs/te...tnumberkey.pdf

Tells you what each number and letter means.

Radomir · #4 01-13-2010, 12:32 PM

It's BR8EIX not EIS

AX-O · #5 01-13-2010, 12:41 PM

Quote:

Originally Posted by Radomir

It's BR8EIX not EIS

I think that is the one I am going to order. About $7 each.

RV7Guy · #6 01-13-2010, 12:52 PM

Quote:

Originally Posted by AX-O

I think that is the one I am going to order. About $7 each.

Axel,

You're wasting money. The standard plugs work great. A friend tried the Iridium plugs thinking, "they cost more, they must be better." Did nothing but use up some fuel money.

I use the standard plugs and have for 500 hours with dual Pmags. Not one plug issue. Replace each annual for around $16.

G-force · #7 01-13-2010, 06:43 PM

I agree. The iridium plugs are good for going long distances, ie 100,000 miles in a car. At $2 each (or cheaper if you buy bulk) the standard plugs are cheap enough to throw away every 50-100 hours or whenever when stop looking perfect.

Toobuilder · #8 01-15-2010, 07:10 AM

There was a fairly animated debate on this very subject not too long ago, and the facts remain the same: Iridium plugs are used because they make cars more "maintenence free". Iridium plugs deliver a consistent spark over a long period with zero maintenance... Hardly a consideration in aircraft, which are operated relatively infrequently and opened up on a regular basis. I replace my BR8ES plugs every year, despite them still looking new. I see no advantage to going with iridium, unless you were going to run the same set of plugs for 5 years or more which would allow their higher cost to amortize over longer time. So there's a potential cost savings, but there has been no evidence that the iridium plugs perform better.

slyfox · #9 01-15-2010, 12:53 PM

I've got the plasma 3 and the original plugs were removed at 100hrs, worn terrible. I replaced with the iridium plugs and now starts better and runs better. I think they are worth it.

frankh · #10 01-15-2010, 02:10 PM

Brbes at $1.19 from the local Knects...toss em every handred hours. If you run LOP (and even better avoid 100LL) they will run perfect and never load up.

Frank