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Assuming well designed intake & exhaust manifolds (&
substantially equal MAP in each rotor measured at the same intake
position of each rotor), do you need 3 feeds to one sensor? Have you
tried using just one, with a small air reservoir for 'inertial
damping' (averaging) of the fluctuating MAP on that line? I'd expect
that the computer is taking 'snapshots' of MAP, & if there's no
plenum to give it an averaged pressure to look at, then the
snapshots would be all over the map (pardon the pun...). Also, I
assume that there's no way to force the computer to take its
snapshot a user-selectable point in the intake cycle, right?
Charlie
On 01/20/2012 07:02 PM, Mark Steitle wrote:
Tracy,
OK, what you said just registered in the grey matter. Any
ideas on what to do if the MAP does't come up fast enough
resulting in bogging? Calibrated air bleeds?
Mark
On Fri, Jan 20, 2012 at 6:46 PM, Mark
Steitle <msteitle@gmail.com>
wrote:
Tracy,
Thanks, I'll check that, but remember... I've got three
of those "suckers" and they're working overtime.
Mark
On Fri, Jan 20, 2012 at 5:27 PM,
Tracy <rwstracy@gmail.com>
wrote:
Sounds
like it's working for you but if those check valves
are "good" ie, don't leak, the MP won't go up fast
enough at the EC2/3 port and the engine will probably
bog down and die when you open the throttle
(especially if done rapidly).. Check your throttle
response to be sure the EC2/3 sees the true MP when
you go to WFO.
Tracy
On Fri, Jan 20, 2012 at
6:04 PM, Mark Steitle <msteitle@gmail.com>
wrote:
I made a major breakthrough today. In
preparation for hooking up my new Hytek data
logger, I decided that it would be a good
idea to install check valves in the vacuum
lines leading from each rotor housing. (For
those who are unaware, I am running a
peripheral port 3-rotor with a slide
throttle TB.) My system measures MAP from
the unused oil injection ports in each rotor
housing. Not sure what possessed me to do a
ground run right then, but I decided to do a
ground run after installing the check
valves. Now keep in mind that typical MAP
readings at idle up to this point was
approx. 17". This has been bugging me, but
it didn't stop me from flying. Well,
today's MAP readings were in the 14.4" -
15.0" range. Then it dawned on me that the
way the vacuum lines were plumbed the EC-2
would see an average of all three rotors.
Since each rotor is 120* (crank degrees)
apart in their 4-stroke cycle, the MAP would
be quite a bit different for each rotor. By
installing check valves in the vacuum lines,
I have now isolated each rotor from the
other two and am measuring the lowest
vacuum. Idle is now down to a respectable
1500 rpm, but the mixture has gone way lean,
so it appears that a re-tune is in order.
I'll probably re-set the EC-2 to the
factory defaults and start the process over
from the very beginning.
I would like to strongly suggest to
anyone that is measuring MAP in the rotor
housings to install check valves in each of
the lines. Your EC-2/3 will thank you for
it.
Mark
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