Delbert Johnson wrote:

I would be interested in a manifold if the bosses are added for at least the
secondary (outer) injectors.  I'm not installing a turbo charger and from
what I have read, it is best to inject the fuel near the engine block
because of condensation problems in the intake runners.  It might also be
better to move the primary injectors onto the manifold because the current
location (on the engine block) probably will interfere with the intake
runners. Is this (current primary injector location on a 13B turbo engine) a
potential problem with routing the runners?

Delbert Johnson

Condensation does not apply to a quasi closed loop fuel injection system. 
Any deposits of fuel in the intake runners eventually evaporates and finds 
its why into the engine eventually. It does not just disappear. In fact this is 
the reason you get better BSFC with the injectors on the beginning of the 
runners as the fuel gets a better chance of mixing well with the air.

We have had two in-flight fires so far with fuel injectors on the hot
side of the engine. Furthermore a small pin hole leak in a 40 psi fuel
injection system can sufficiently mix fuel with air creating an explosive mixture.

If the airplane does not actually blow up an in-flight fire is one of the 
worst things that can happen to you as you cannot always get the airplane on the
ground within seconds to save your life unlike stopping a car and jumping out. 
It is not a nice way to die.

Paul Lamar
 
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