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Homebrew Injection Systems, Steep Approaches

 
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mfisher(at)gci.net
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PostPosted: Sun Feb 03, 2008 11:34 am    Post subject: Homebrew Injection Systems, Steep Approaches Reply with quote

Hi alternate engine aficiondos,

Thanks for recommending some interesting web sites. There is no shortage of ideas out there. I will be using a homebrew, constant flow injection system with no electronics. The core idea came from the book "Jungle Pilot" by Nate Saint. Three power settings will do the job --- takeoff, cruise, and approach. A blip-switch on the stick will enable zero thrust operations. A light wooden propeller on a high compression engine will quit turning if the pilot slows it too much. Mustn't let that happen.

A little open cockpit parasol monoplane (Pietenpol) peels off into a steep slip to clear the tall spruce trees guarding a river gravel bar where the king salmon run. Brppp, brppp, brppp sounds are trumpeting from the short Allison style stacks. How cool is that? Not much vertical surface aft of the aerodynamic center, large control surfaces, ignition interrupt to zero thrust -- the Piet can descend fast enough to get in plenty of trouble...don't let it bite you.

Happy landings,

Mike Fisher
Talkeetna, Alaska

Subject: Re: Pietenpol-List: Steep Approaches, Homebrew Injection
Got any more details on that injection system? Sounds intriguing.

Hi alternate engine aficionados,
The injection system is only a concept at this point. Throttle body injection
or carburetor results in wet manifold. Intake port, multi-point injection keeps
the manifold dry. --- Huge difference in Cyl. to Cyl. charge balance and icing
resistance -- greatly favors dry manifold. There is no need for sequential
port injection at power settings much above an idle. Many have adapted a carburetor
to engines designed for injection. This works better on systems that
were originally throttle body. I will be working on the 1.9L inverted Ford
constant-flow, multi-point system whenever I get the dry sump oiling system operational.

Mike Fisher


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