Subject: return less systems
From: Rotary Engine
Date: 3/4/2009, 6:34 PM
To: AAA Put this in the To box

<snip>
If you are going to run a returnless system with fuel injection you
are
going to want to test pressure spikes and drops. It is almost standard
to run a pulsation damper in the rail to make sure the pressure loss
in
the rail due to injection stays consistent for consistent pulse width
delivery. I dealt with this on Korean cars we tuned since they like to
use cheap stuff. In really cold environments you can run into weird
issues.

Rob Woods

Rob -

Thanks for the design ideas.  Feel free to lay them on thick - I don't
need to make all the mistakes myself, you know.

I already plan on including a fuel rail pulse dampener.  (I like a
simple air column.)  Part of the testing will include measuring
pressure variations with different injector pulse widths and flow rates.

FYI: Other design considerations: Will fuel dead heading in the fuel
rail cause hot start problems?  Purge options and methods?  Pulse
dampener type?  Can we get by without a sump tank?  Will running both
left & right tank pumps cause fuel pressure oscillations?

Feel free to note other considerations and recommend tests/measurements.

Now ... how about some part numbers?  :)  I'm ready to hit the
junkyards.

-Vince Orton



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