Al Gietzen wrote:

Would be a shame not to utilize these injectors.  Not only are

they

important for good starting and running at lower rpm, but offer a

good

option for redundancy.  If you have fuel leak (vapors) and an

ignition

source, it's not going to matter much where your injectors are.

Al

I strongly disagree Al. Aircraft engines rarely explode from
vapors. The same goes for auto engine installations.
Fuel fires on the other hand are all too common.

Why put the leak next to the ignition source?

Paul Lamar

Rino wrote:

Paul, I get the impression that Al thinks that I am NOT using the
primary injectors.
I am just installing them on the other side of the engine, in the

intake

primary runners.
I am not concerned so much about the injectors but it is the fuel

lines

and fuel railson top of the exhaust manifold that I am not happy with.

The last crash landing that we read about on this list was apparently
caused by the fuel boiling in the lines.  No explosion, no fire, just

a

crash!

Rino

I understand that you are using primary injectors.  I believe that there
is
a very good reason that Mazda put those injectors right in the housing
at
the rotor; which goes beyond automotive use.  What I would envision on a
cold start on a cold day with the
primary injectors far from the ports is lots of little fuel droplets on
the
inside wall of the runner, and an engine that is difficult to start, and
won't run well until revved up.   Is there then
potential for a backfire and a fire and/or explosion in the runner?

I don't argue that there is potentially a higher risk having fuel lines
on
the exhaust side of the engine.  But like any risk, you have to design
around it.  With an appropriate baffle, quality fuel lines with fire
sleeve,
is it really so different to have the fuel line 1 ft away or 2 ft away?
And
are you trading one risk for another, and potential operating problems.
I
don't claim to know; I'm just theorizing.  Do we have good operating
experience with both sets of injectors far from the ports?

Al

Yes. Download the Leman paper from the http://www.thecarricos.com/ACRE
web site. Also all throttle body injectors on ten of thousands of trucks 
and cars. Fundamentally no different than a carburetor.


Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.