The Franklin Aircraft engines used a 14 mm aircraft spark plug. The plugs can be found. I think you'll do better to use automotive plugs and shielding from Great Plains.
I use the 14 mm adapter from my automotive compression gauge to adapt my compression differential tester for Franklins and VWs. It has the same common air hose coupling, so works fine. Jeff Scott On Thu, 2 Feb 2006 07:39:17 -0500 <w-z...@sbcglobal.net> writes: > The main reason I ask is to figure out if I could use a conventional > > automotive compression gauge to check cylinder compression. I need > to make > sure that the cylinder compressions aren't too high on a motor that > I am > looking at purchasing. Just trying to determine if I'd need an > adapter to > make an auto compression gauge work on a revmaster engine with Mahle > 94mm > cylinders installed. > > While I'm on the subject. Is there an adapter available that would > allow > for the use of an aviation compression/leak down test? > > Bill Zink > Columbus, OH > > > > Absolutely. That is standard automotive plugs. > > Who would want aircraft spark plugs anyway? They cost ten or twenty > times > more, and are very old, inefficient and unreliable technology. The > only > engine I know VW engine that does that is the Limbach, and that's > because > it's a certified engine, and the authorities would not give them a > certification unless they went that route. > > > Just wondering if the revmaster 2100d uses automotive spark plugs. > I > spoke with Joe at revmaster and he said that they were 14mm so I am > assuming this is an automotive plug since aircraft plugs aren't > sized > in metrics. Is 14mm a standard size plug? > > Bill Zink > Columbus, OH >
