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I'll throw in my nickel in this discussion, but it has
nothing to do with performance, etc.
From the tests that Rob Logan did (and published to the
LML). If you are really seeing 1.5" of MAP in addition when RAM is on, then you
are right on the ragged edge of the stock injectors leaking fuel all over the
tops of your cylinders. :)... (actually, it's not that bad, but yes, they
will leak).
Rob found that just north of 1.5" of MAP on RAM would cause
the stock (non turbo-railed) injectors to leak fuel. I think it was Mike
Mahar that has made some sets of rails to solve this problem and at well south
of what you'd have to pay for the rails from TCM.
I'm gonna wait and see what I end up with for RAM on mine,
but will most likely look for a solution to the leaking injector
problem.
Search the LML for Robs original posts and pictures, he
made many tests primarily around improving RAM performance for "stock" racing,
and found the injector leaking problem.
Alan
Walter and Others,
I have been following this topic with some
interest and it has come up before.
I have an IO-550N with GAMI injectors and on my
first GAMI lean test it appears that the spread between the first and last
EGT to peak is about 0.2 gal/hr. In otherwords - pretty
darn good. My ram air setup gives about 1.5 inches increase in
manifold pressure. I intend to operate LOP at
"high" altitudes (high teens mostly) and would like a smooth running
engine.
Is it the consensus of opinion that using turbo
injectors and pressurizing them creates a smoother running engine? Has
this been consistently demonstrated?
The reason that I ask is that people that I respect
have come down on both sides of this issue. Some say that pressurizing the
injectors is crucial, others that it makes no difference.
- At what altitudes and at what settings LOP (20 deg
vs 100 deg) do you notice this effect?
- If you turn off the ram air (but still run LOP)
does the engine run more smoothly?
Obviously, I can test these issues myself in the
future (I am still in Phase 1), but am interested in others
experience.
D. Brunner
N241DB - 25 hours
----- Original Message -----
Sent: Thursday, December 13, 2007 2:59
PM
Subject: [LML] Re: GAMI Injectors -
question for Walter
Mark:
One factor you did not mention is that when using
ram air, the pressure in the induction system can be higher than upper deck
cooling air flow. This can cause fuel to actually leak out of injectors
causing blue staining nearby.
Yes, but not if you use the turbo-type injectors.
**the improvement in engine
smoothness when running LOP in high altitude cruise is
DRAMATIC.
Due in large part to the better atomization and therefore better
vaporization.
Walter
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