Walter and Others,
I have been following this topic with some interest and it has come up before.
I have an IO-550N with GAMI injectors and on my first GAMI lean test it appears that the spread between the first and last EGT to peak is about 0.2 gal/hr. In otherwords - pretty darn good. My ram air setup gives about 1.5 inches increase in manifold pressure. I intend to operate LOP at "high" altitudes (high teens mostly) and would like a smooth running engine.
Is it the consensus of opinion that using turbo injectors and pressurizing them creates a smoother running engine? Has this been consistently demonstrated?
The reason that I ask is that people that I respect have come down on both sides of this issue. Some say that pressurizing the injectors is crucial, others that it makes no difference.
- At what altitudes and at what settings LOP (20 deg vs 100 deg) do you notice this effect?
- If you turn off the ram air (but still run LOP) does the engine run more smoothly?
Obviously, I can test these issues myself in the future (I am still in Phase 1), but am interested in others experience.
D. Brunner
N241DB - 25 hours
----- Original Message -----
Sent: Thursday, December 13, 2007 2:59 PM
Subject: [LML] Re: GAMI Injectors - question for Walter
Mark:
One factor you did not mention is that when using ram air, the pressure in the induction system can be higher than upper deck cooling air flow. This can cause fuel to actually leak out of injectors causing blue staining nearby.
Yes, but not if you use the turbo-type injectors.
**the improvement in engine smoothness when running LOP in high altitude cruise is DRAMATIC.
Due in large part to the better atomization and therefore better vaporization.
Walter