Rene Ffrench wrote: Yes, you'll need a primer. I have 3.5 psi feeding the carb. The carb isn't supposed to flow unless it is receiving air, so primer is required to get it going. I'm using a primer, and you'll a primer in all but the warmest of conditions. I ran an 1/8" copper tube from an electric primer solenoid to a T that splits to each side, and at each head is another T, with a primer nozzle going to a fitting that I welded into each intake (total of four). Actually, I welded a piece of steel tubing into the manifolds and threaded it.
Four nozzles may be overkill, but "real" airplane people are astounded that I can turn it over a couple of blades in freezing weather and it starts and runs smoothly! There is a special primer fitting that AS&S (and likely Wicks) sells that has an orifice in it that sprays an atomized mist. It also has a cone connection that must be silver soldered (not as hard as it sounds) to the copper tubing. See http://www.aircraftspruce.com/catalog/hapages/primerfittings.php?clickkey=3014828 for all of this stuff, and I warn you that it is expensive. You don't need everything in the photo, just the discharge nipple, the cone fitting, and retaining nut (AN-805). Don't take my word for it though...investigate a little. I've bought stuff that I didn't need, and it's all expensive. One benefit of this system is that if your engine suffers vapor lock in flight and starves for fuel, you can "pulse" the primer off and on to keep the engine running. Been there, done that, glad it works... Mark Langford ML at N56ML.com http://www.n56ml.com
