An interesting issue has come up for all you engine experts.

I have an IO-550 N that I am getting ready to install in my Legacy.  It was built with GAMI injectors and I am planning to use the Lancair Ram Air.

It has been suggested by a knowlegeable source that I will need to pressurize my injectors (like a turbo) because of the difference between the induction air pressure and ambient air pressure (about 1.5 inches) or else two things will happen:

1)  There will be some fuel leakage and staining around the injectors
2)  The "atomization" of the fuel will be affected and the engine will have trouble running smoothly lean of peak.

Mike Mahar has RAM air pressurizing rails to deal with this issue.

On the other hand, another knowledgeable source agrees with number 1 above,
but disputes number 2.

Since I hope to run my engine lean of peak smoothly, do I need to pressurize my injectors to have them properly "atomize" fuel?  Or is the issue of pressurization merely one related to a small amount of fuel leakage and staining?

Doug Brunner