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23 Sources! Gee, I can't think of that many
variables involved {:>).
As Tracy stated, fortunately the errors are fairly
consistent and therefore can be "calibrated" out to where the error is less than
1% (actually much less). So while the issue of accuracy at cruise settings
is a non- issue (in my opinion), the sloppy idle due to excessive fuel was not
such a minor issue.
At one time I tried to increase my injectors from
the 460 cc/min to the 550 cc/min and found the idle got so lumpy and sloppy that
I had to switch back - now the reason is a bit clearer why the problem
with idle.
Early on after switching to Tracy's EC2 I was using
a different intake/injector set with injectors that flowed around 32
lbs/hour. My idle was very smooth with those, but decided to use the block
holes for the primary injectors so adopted the Mazda injectors which were rated
for around 42 lbs/hour. My idle was never quite as good as with the
smaller injectors.
Actually, probably a good idea to go smaller on the
primaries and larger (if needed) on the secondary injectors.
Ed
----- Original Message -----
Sent: Monday, March 12, 2007 10:45
AM
Subject: [FlyRotary] Re: The truth??? /
Injector flow rate mystery solved
In a word, Big.
But in the end, it really does not matter. Ed and I
have found that after calibration (compensating for all the cumulative
errors), the flow reading error under cruise conditions is
insignificant. It might be intellectually gratifying to know how much
error there is in all 23 sources but that would be time spent not
building and not flying. A bad trade. But if someone wants to hunt
them down and report on them, I'll listen with interest!
Tracy (back to working on the -8, and waiting on Bluemountain -
Arrrgghh.....)
----- Original Message -----
Sent: Monday, March 12, 2007 10:17
AM
Subject: [FlyRotary] Re: The truth??? /
Injector flow rate mystery solved
Guys, sorry for the interruption....
How much error is really being seen?
Back in my early days at Bosch GmbH (I worked in the IC Center in
Reutlingen, GErmany) on the fuel injectors, and with the BMW system on
calibration. It's been a while, but at the time we had come up
with something like 23 sources of errors on "pulse width" vs. "fuel flow
measurement".
Sorry for being such a dummy, but I'm having a hard time trying
to figure out just how much error is involved, and under what rpm
range (idle, cruise, high speed cruise, WOT).
Tom Walter
(digest mode)
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