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Spark plugs

REM37BYs are about $30 USD each, or $240 total. That wouldn’t bother me if it wasn’t a roughly 50% increase in price over the last 10 years, which incidentally is about how often I buy a set of aircraft plugs. I buy aircraft oil more often, for substantially less than the price I pay for motorcycle oil.

3 quid for the rotax 912

Yes, but

8 × 3 quid (lasting how long?) or
8 × 50 quid (lasting 2000+ hours)

(comparing 4-cyl engines)

are both insignificant on the scale of aircraft operating costs

And the aircraft plugs at least have a nice watertight top connection.

Administrator
Shoreham EGKA, United Kingdom

Thanks, Bathman, I didn’t dare to say it

EDLE

If you drop a spark plug (iridium or not), it’s toast. Therefore I don’t use iridium as I would be about 4x madder in case I drop one

For the same reason your mechanic would have 4x more reason to not tell you he dropped it…

3 quid for the rotax 912

I found the Tempest iridium plugs slightly cheaper than the previous Champions, which was quite funny since the Champions had the crappy resistors!

I think I paid about GBP 50 each for them, but that isn’t current data.

The iridium plugs I have been using, since about 2003, have never shown any wear. I think the longest I have gone with a set was about 700hrs and even then the electrodes showed zero wear. When I had the crank swapped at 800hrs I pointlessly bought new plugs (had the alternator etc overhauled also) and for some reason didn’t check the price and paid something like $100 each So provided there isn’t something else wrong with them which gets worse over time (which should be OK with the Tempest plugs) the price is not really an issue since they will last the entire life of the engine (between overhauls).

Administrator
Shoreham EGKA, United Kingdom

I use Tempest finewires too in the SR22, running smoother now than before, but they are expensive, almost $ 900 fopr the set …

aircraftspruce.eu would be my preferred supplier, located in Germany.

great (as allways lol) so Tempest it is now the next question where to buy?

fly2000

Do a search here on

spark plug resistors

and fill your boots

I use Tempest – URHM38S for the TB20. Absolutely perfect after hundreds of hours. Champion did change the design later but their stonewalling and whitewashing behaviour was appalling.

Iridium plugs were very much affected – see the search hits.

Administrator
Shoreham EGKA, United Kingdom
12 Posts
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