Spark Plugs

[Ron Spiker]

I thought this had already been discussed, but now I'm not finding it in the threads. What spark plugs are you guys using? I'm seeing REM40E and REM38E being used, but it also looks like RHB37E is listed in Lycoming's documentation.

Ron

[psehorne]

I thought this had already been discussed, but now I'm not finding it in the threads. What spark plugs are you guys using? I'm seeing REM40E and REM38E being used, but it also looks like RHB37E is listed in Lycoming's documentation.

Ron

Ron,
I'm not where I can check the exact part number right now. I will do that and post the full number. For now I will say that I had the A&P that did the annual on my Brantly last month install 40s. The only reason the plugs were replaced (they were platinum plugs and in excellent) is that whoever installed them used plugs which had too many threads and there were two or three turns of threads extending into the cylinder. The plug was not hitting anything (like the top of the piston), but the mechanic advised me that the threads would eventually carbon up it might be VERY difficult to remove the plugs.

Bottom line, check the thread/barrel length as well as other parameters of the plug when making your choice.

I chose the hotter 40s since whatever little bit of additional power they provide, if any, is sorely needed by the Brantly at gross weight and high density altitude.

BTW, did you ever check out the Pharos GeoTagging package? Sure would be a nice addition to your trip photo logs.


Paul

[Ron Spiker]

I guess it is in the Campion Aerospace, Inc. Aviation Catalog AV-14, page 8, that lists the RHB37E for the Brantly B2B. I thought it was a Lycoming publication.

Anyhow, I have the Autolite UREM38E's in there since the overhaul. At 50 hours since the overhaul the plugs are pretty black but don't look to be fouled. One plug is damaged and I was debating about replacing all with perhaps the 40E (Autolite or Champion) to get a hotter plug. I'll most likely just replace the one damaged plug and clean all the rest and put them back in. I can't say that I know whether there are too many threads on the plugs or not though, but I'll check.

I did look at the GeoTagging package. Pretty cool how it works. I'll look again before my next trip, whenever that happens to be.

Thanks,
Ron

[psehorne]

I thought this had already been discussed, but now I'm not finding it in the threads. What spark plugs are you guys using? I'm seeing REM40E and REM38E being used, but it also looks like RHB37E is listed in Lycoming's documentation.

Ron

CORRECTED....

Ron,
The plugs that are installed in my Brantly are Champion RHM40E. If I interpret Aircraft Spruce's web page ( http://www.aircraftspruce.com/catalog/e ... kplugs.php ) correctly, the 'reach', indicated by the M, is 1/2"/1.27cm. The longer plugs that were removed were RHBs with 13/16" / 2.06cm reach.

Paul

[bryancobb]

FAA Type Certificate 1E1 (For Lycoming IVO/VO-360 Series Engines) List 26 different plugs that meet Airworthiness
Requirements for these engines.

I guess the olde tyme "Gurus" like Harold Jenkins or Kevin Hynes can tell you which ones work best in which climates.

I personally had great results with REM40E's in North Georgia.

[Ron Spiker]

Thanks guys, I'm running the REM38E's in there now, but may end up switching to the 40E's at next inspection. Depends on how they look next time.


Ron

[psehorne]

Another reason I chose the 40s is that we run these engines full rich most of the time and the 40s are supposed to be less prone to carbon fouling.