Yes, the 20B uses an external injector relay. This is optional (it says so on the schematic, but Tracy recommends including it) and can be left out if the builder does not want to be able to run only on primary or secondary injectors in case of an emergency, such as one injector decides to quit working. It uses the Cold Start circuit to double the flow to whichever bank of injectors are chosen. Pretty clever, but rather confusing to wire.
If you want to see a strange look on Tracy's face sometime, just ask him to explain what he means by "injector enable/injector disable." Is down to enable and up to disable, or is it up to enable and down to disable? I installed my injector switches so up was normal (enable) and down to turn them off (disable).
One more thing about the "snubber upgrade" that you need to realize is that the "sneak circuit" is gone. No more glowing program button. That may be related somehow to do with the NO/NC issue.
Mark S.
On 5/19/07, Kelly Troyer <keltro@att.net> wrote:
Mark,
Is the injector relay of the 20B version of the EC-2 external
to the EC-2........I seem to vaguely remember hearing something
different about the 20B version......Could be just an old unreliable
memory !!
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Mark Steitle" <
msteitle@gmail.com>: --------------
Buly,
Here's one sentence from Tracy's email to me about a week ago concerning the NO vs. NC terminal on the injector relay. (The rest of his email is not relevant to this topic.)
<snip>
Duh... Sorry about that. Should have read "The Normally Open contact is now used instead of the Normally closed contact."
<snip>
So, make certain that the lead that goes to the EC-2 from the injector relay is connected to the Norally Open terminal on the injector relay, and not the Normally Closed terminal. It is my understanding that this wire is the ground for the secondary injectors. If you haven't switched this connection, that very well could be the problem. Let us know what you find.
Mark S.
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