Homebuilt systems like Tracy's are great and work just fine.

The

biggest

advantage that I see is the tunablility of the system and the

availablilty at a reasonable price due to using auto parts.

  Another unmentioned advantage of EFI over mechanical injection is

the

ability to tailor duty cycle on individual injectors in order to

optimize

fuel flow to each individual cylinder (or rotor). To get the

equivalent

in

an MI system requires flow matching of each individual injector such

as

GAMI injectors. I think a set of GAMI injectors for an MI system

cost

more

than my complete EFI system will.

Mike Wills

In the case of an aircraft engine you will also need a EGT CHT scanner

to

accomplish

that and they are not cheap. I don't think Tracy's system can taylor

individual injectors.

Is there a EFI system out there that can do that? The potential is

certainly

there.

Paul Lamar

Yes, the EC2 allows you to adjust the front & rear rotors independantly
while in-flight.  I agree with Mike,  this kind of thing is a huge

advantage

of electronic vs mechanical systems.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

I stand corrected Tracy. You adjust it I assume from the EGT probes in
both exhaust pipes.

Paul Lamar

Yes, and a digital EGT gauge is mandatory.  The resolution on analog meters
is not good enough to get a really close match.  I like to get EGT
differential less than 10 degrees at cruise conditions.  Having only two (or
three on 20B) EGTs to match is another advantage of the rotary :-)

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

 
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