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O-200 motor - which plug would you recommend?

PostPosted:Wed May 22, 2019 10:17 am
by CloudHound
I've never had to buy spark plugs for an aero engine so looking for some advice, please.

Champion list 3 options
    REM40E
    RHM40 and
    REM37BY
I'm not particularly price sensitive so just trying to figure out what the team thinks is best.

Ta!

Re: O-200 motor - which plug would you recommend?

PostPosted:Wed May 22, 2019 3:45 pm
by Kittyhawk
We use REM40E in ours

Re: O-200 motor - which plug would you recommend?

PostPosted:Wed May 22, 2019 6:07 pm
by mick w
Kittyhawk wrote:We use REM40E in ours


I think most do , it's all I've ever seen in one . :thumright:

Re: O-200 motor - which plug would you recommend?

PostPosted:Wed May 22, 2019 7:47 pm
by cockney steve
I, Personally, don't like Champion plugs,- Having said that, their website should list a breakdown of their codes, the first group usually designates thread, reach and maybe electrode configuration, thenumber is usually heat- range ("softer" = hotter, for a cold-running engine or a bit of an oil-burner probably better in a rich-running engine with no mixture-weakening. A "hard, " plug is the converse, used for racing and arduous service where really hot electrodes could glow and cause pre-ignition (pinking) which can destroy a piston in seconds.
Suffix- letters usually indicate special features (RF shielding, inbuilt suppressor- resistor , ETC.
Until you have the code for a specific plug- manufacturer, you will not be able to make an informed choice, just because a particular plug works, doesn't mean it's the optimum.

Re: O-200 motor - which plug would you recommend?

PostPosted:Wed May 22, 2019 10:01 pm
by CloudHound
Thanks everyone.

Went for Tempest UREM40E from Transair at £27.67 inc VAT plus a fiver for postage.

Now for the Mags :pale:

Re: O-200 motor - which plug would you recommend?

PostPosted:Thu May 23, 2019 8:26 am
by mick w
CloudHound wrote:Thanks everyone.

Went for Tempest UREM40E from Transair at £27.67 inc VAT plus a fiver for postage.

Now for the Mags :pale:


Maybe you should have gone for this option ??.
http://www.chiefaircraft.com/slk-k4520-40.html

Re: O-200 motor - which plug would you recommend?

PostPosted:Thu May 23, 2019 8:46 am
by Clive Richards
No he wants the most reliable option Tempist plugs & Bendix mags

Re: O-200 motor - which plug would you recommend?

PostPosted:Thu May 23, 2019 2:01 pm
by chrisrizos
REM40E

Re: O-200 motor - which plug would you recommend?

PostPosted:Wed May 29, 2019 8:37 pm
by CloudHound
So, test flight completed AOK

Why I should be surprised at how well the engine performed with new plugs, carb and distributor gears in the magnetos, I dunno.

Re: O-200 motor - which plug would you recommend?

PostPosted:Sat Jun 15, 2019 10:18 pm
by CloudHound
Update after 5 hours flying.

Just great. Engine running superb (ly) :thumright:

OK, £200 is a lot of money but for the improvement and more importantly peace of mind, replacement new plugs should be top dead centre of the list.

Re: O-200 motor - which plug would you recommend?

PostPosted:Sun Jun 16, 2019 9:47 am
by Trent772
REM37BY plugs don't foul as much, but they are all similar.

Re: O-200 motor - which plug would you recommend?

PostPosted:Sun Jun 16, 2019 9:51 am
by Bathman
I would recommend unleaded fuel. Much better for those plugs

Re: O-200 motor - which plug would you recommend?

PostPosted:Sun Jun 16, 2019 2:24 pm
by cockney steve
AIUI, Cloud hound is mainly flying aerobatics. As such , presumably the aircraft is doing short (20 -minute? ) sorties, the engine gets a good thrashing with full power climbouts and plenty of high-energy manoeuvers. A harder (colder) plug , under those circumstances, would be unlikely to foul, but more importantly, would be unlikely to overheat and cause detonation which can melt a piston-crown in a couple of minutes, or less!
Horses for courses! At least instrumentation is available (cht, egt) that an educated pilot can determine a proper management- regime.
In the old days, cars had a quadrant on the steering wheel for mixture and another for timing. together, they can be tuned for the requirements of power or economy, without wrecking the engine or shortening it's service-life.

Re: O-200 motor - which plug would you recommend?

PostPosted:Sun Jun 16, 2019 10:11 pm
by Charliesixtysix
cockney steve wrote:AIUI, Cloud hound is mainly flying aerobatics. As such , presumably the aircraft is doing short (20 -minute? ) sorties, the engine gets a good thrashing with full power climbouts and plenty of high-energy manoeuvers.



Now that I would like to see......in a 1930s era Stinson..... :shock:

Re: O-200 motor - which plug would you recommend?

PostPosted:Mon Jun 17, 2019 12:41 am
by cockney steve
^^^^^^^^ "full power" and "high energy" are, of course, relative terms.

:roll: :D