My EFS 3-A feeds a turbo (draw thru as per Ellison), seems to work well.
But I was never able to get the static rpm I thought I should be getting.
Runs great without a prop, revs to 5000. Add a prop - 3500. Before the
overhaul
I was getting 42-4400 rpm. Tried re-pitching the warp drive, tried timing
adjustments (as Jeff probably remembers).
About the only thing I didn't try was manual waste gate - using vacuum from
output side of turbo.
Even though I've kind of retired from working on it, it still nags me...
On 3/8/2014 11:40 AM, Jeff Scott wrote:
> 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.
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