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From: =?utf-8?B?U2VwcGFuZW4sIEthcmkgSg==?= <kari.j.seppanen at boeing.com>
Date: Sat, 03 Aug 2002 00:00:53 UTC
The best way to check whether the plugs are worn is to use the little erosion guage Champion hands out at Oshkosh and Sun 'n Fun. The P/N is CT-482 and they are for massive electrode plugs only. They're free at the shows but I don't know if you can get them for that price at other times. If your plug fits through the little hole after gapping, it's worn out. Kari J. Seppanen Flight Test Engineering Analysis Aerodynamic Performance Group kari.j.seppanen at boeing.com N909RC E33C -----Original Message----- From: Dave Walkup [mailto:dwalkup at prodigy.net] Sent: Wednesday, July 31, 2002 7:54 AM To: acro at gf24.de Subject: [Acro] Spark Plugs Any opinions out there on which plugs to use on an AEIO-540 with 10-1 compression? Our acro mount has been using a combo of fine wire and massive core. The massive core have always been installed on the top. Recently, one (or now two) of the fine wires on the bottom have become fouled after 3-4 short acro flights over a three hour period. My mechanic thinks that maybe we should switch to massive core for the bottom too. The reasoning is they hold heat better, that maybe pulling the throttle back during acro and landing right after 15 minutes in the box, the fine wire cools rapidly and contribute to the plug fouling. Both mags have just been off and rebuilt, so I don't suspect a problem there. The engine does run VERY rich on the ground, so leaning on taxi is a must. The plug fouling cannot be corrected by ground runup and leaning. We pull them, put them on the bench, clean and they fire again ok. Maybe they just getting old? Thanks for any advise you have, Dave