Actually, the Ellison is one of the aftermarket single point fuel injection systems that works well with a proper mixture control and a fuel "spray bar" behind the slide. ?The Rotec single point fuel injection system is another that provides acceptable results and is essentially a clone of the Ellison except that the pressure regulator is mounted separately rather than being built as part of the injector frame. (TBI-40-3 for a Corvair, Continental, or small Lycoming and TBI-40-S for the Rotax, Jabiru and VW) ?
The rest of the TBI units are single point dribbler style. ?Posa, Revflo, and Aerocarb depend on the right needle or needle profile and can be difficult to get set up correctly. ?I have set up an Aerocarb on a 6 cyl Jabiru configured for our airport at 7000' MSL. ?It took a month or two of screwing around with it and test flying with the engine performing at less than 100%. (I was not doing the test flying!) ?The Aerocarb had 3 different needle profiles with it and instructions that read like it should be simple to do. ?However, fine tuning to get it correct was not simple. ?IMHO, test flying carb setups looking for the right combination is asking for disaster, and it came close with this one. Generally speaking, if you want an overhauled or new MA3-SPA of the right part number (10-4894) for your Corvair, you are likely looking in the neighborhood of $1500. ?If you have a good core to trade, it's half of that. ?If you keep your eyes open, you can find a carb that might be usable, but it's really a crap shoot as to the condition of what you are buying. ? One of the less expensive MS carbs that I would think would work well on the Corvairs would be the MA3-A carb (part No 10-3103-01). ?This carb was used on numerous variations of the Lycoming O-235 engine. ?This carb is not very popular as it does not have an accelerator pump, so for those that like to jam the throttle, the engine may stumble. ?However, it does have proper mixture control. ?Because it lacks an accelerator pump, it is less expensive to buy, less expensive to overhaul and due to the lack of popularity, can often times be found at bargain prices. ?If you have ever flown a Grumman Yankee or 7ECA Citabria you've flown with this carb. -Jeff Scott Los Alamos, NM > ----- Original Message ----- > From: peter > Sent: 03/08/14 10:51 AM > To: krnet at list.krnet.org > Subject: Re: KR> Ellison Carbueretor Pricing & Compatibility > > I'm wondering once again why experimenting with the carb on an aircraft is an > attractive idea. There are MA 3s available for almost nothing in the aviation > Eworld. No experimentation required. The Ellison has been baffling > experimenters since it was introduced in the mid '80s, always looking for the > perfect( or even just a usable) needle profile. Am I out of touch? Peter > ? > > ? > > EFS-3A is $1,030.00 plus shipping and handling.Please note that we have a > limited number of EFS-3A's in stock and will notbe manufacturing more due to > production costs.
