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The first iteration of my manifold exhibited similar symptoms to what you describe. The EGTs of the #1 rotor wouldn't come off the peg until I hit 3000rpm, and then would stay way below #2. I determined that the way I had arranged it, the intake was creating a venturi vacuum in front of the #1 rotor. Could you have a similar imbalance?
Mark Steitle <msteitle@gmail.com> wrote:
Tracy,
OUCH, that hurts! OK, here's the rest of the story. I've changed my
intake manifold and changed injector sizes, so I'm back to the tuning
phase. The B controller won't run right now as I haven't copied A to
B yet. I'll have to do that before I can try the B controller.
Thanks for reminding me that I typically do things the hard way.
Mark
On 3/21/12, Tracy <rwstracy@gmail.com> wrote:
Trying the B controller should always be the FIRST thing to try since it is
the easiest. This needs to be ingrained in all EC2/3 users mental (or
preferably written) engine failure check list. Everything including the
coil & injector drivers are swapped out when selecting B controller. Based
on the number of time I have asked if the B controller was tried when called
about an engine anomally I have concluded that very few builders are even
aware it it there : ).
Tracy
Sent from my iPad
On Mar 21, 2012, at 3:58 PM, Mark Steitle <msteitle@gmail.com> wrote:
I have been chasing a problem with my p-port 3-rotor where the #1
rotor cuts out at around 3800 rpm, but comes back at around 5000 rpm.
When this happens, I can hear a change in the exhaust, and I see the
EGT on #1 drop way down to around 500*, so that's how I determined
that it was the #1 rotor. The other two rotors continue to run
normally.
I have tried swapping coils, replacing the #1 rotor's plugs & coil
wires, and swapping injectors. I have not tried the B controller, but
that sounds like what I should try next. My suspicion is there may be
a defective coil driver circuit in the EC-2. I have borrowed another
20B EC-2 to try, but won't be able to do the swap until this coming
weekend.
Since things have been so quiet on the list, I thought I would post
this strange problem and see what suggestions others may have.
Mark S.
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