Iridium automobile spark plug question.
 

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.

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.

Found this on the web.

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

Tells you what each number and letter means.

It's BR8EIX not EIS

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

Waste of money
 

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.

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.

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.

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.

Waste of money
 

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