BeechTalk - BT

Username Protected · **Posted:** 22 Dec 2014, 19:25

Username Protected wrote:

Question?

Uh, yeah, what does "I got a nice steady reading across all cylinders" mean?

Did you perform a GAMI lean test?

I have trouble imagining that "I swapped the factory injectors around" would "work as good GAMI's".

However, I have seen stranger things.

Username Protected · **Posted:** 22 Dec 2014, 21:57

Username Protected wrote:

Question?

Uh, yeah, what does "I got a nice steady reading across all cylinders" mean?

Did you perform a GAMI lean test?

I have trouble imagining that "I swapped the factory injectors around" would "work as good GAMI's".

However, I have seen stranger things.

Username Protected · **Posted:** 22 Dec 2014, 22:21

Username Protected wrote:

What i did was, now forgive me if my terminology is wrong but i did what made sense.

I found the cylinder that needs the most fuel and swapped that injector with the cylinder that needs the least fuel.. After a few movements of injectors I had all cylinders peaking at almost the same fuel flow..

I then had much nicer readings across egt's and cylinder head temps and fuel flows

I thought by buying GAMI's I could eliminate those steps. The GAMI's were better out of the box than my stock setup but still need attending to. I have not bothered with it yet.
Its on the to do list!

Steve, if you've got them all peaking within .5 GPH of each other, you did good.

Have you performed the GAMI lean test? http://www.gami.com/gamijectors/leantest.php to see exactly how close they peak?

Username Protected · **Posted:** 22 Dec 2014, 22:28

I believe that is what I was doing. At the time my JPI was a new toy so it was of great interest to me.

Time to tune the GAMI's!!

Username Protected · **Posted:** 22 Dec 2014, 22:36

VGs should be requred equipment for all twins.

Username Protected · **Posted:** 22 Dec 2014, 22:43

Username Protected wrote:

I have VG's but have never flown one without so I cannot give a point of reference.

I did have GAMI's installed at engine rebuilds but have not taken the time to dial them in yet.

Dont think I would add GAMI's again, when I first got the plane I swapped the factory injectors around untill I got a nice steady reading across all cylinders. This works as good GAMI's I would bet.

Steve, I had GAMI's installed my Bonanza. As I understand it, the STC does not permit shifting GAMI injectors because each injector is specified for each cylinder. When injectors were not optimal, GAMI was very understanding and swaped injector at the drop of a hat. After about 3 rounds of swapping some injectors, my engine began to run like a top. In my case, my GAMI spread with factory injectors was >2 GPH. Needless to say, I am a believer in GAMI's.

Username Protected · **Posted:** 22 Dec 2014, 23:34

Username Protected wrote:

I have VG's but have never flown one without so I cannot give a point of reference.

I did have GAMI's installed at engine rebuilds but have not taken the time to dial them in yet.

Dont think I would add GAMI's again, when I first got the plane I swapped the factory injectors around untill I got a nice steady reading across all cylinders. This works as good GAMI's I would bet.

Steve, I had GAMI's installed my Bonanza. As I understand it, the STC does not permit shifting GAMI injectors because each injector is specified for each cylinder. When injectors were not optimal, GAMI was very understanding and swaped injector at the drop of a hat. After about 3 rounds of swapping some injectors, my engine began to run like a top. In my case, my GAMI spread with factory injectors was >2 GPH. Needless to say, I am a believer in GAMI's.

Username Protected · **Posted:** 22 Dec 2014, 23:57

Username Protected wrote:

I have VG's but have never flown one without so I cannot give a point of reference.

I did have GAMI's installed at engine rebuilds but have not taken the time to dial them in yet.

Dont think I would add GAMI's again, when I first got the plane I swapped the factory injectors around untill I got a nice steady reading across all cylinders. This works as good GAMI's I would bet.

Steve, if you're talking about the EGTs being the same, you're not on the right track. EGTs can be, and almost always are UNEVEN. What we're really looking for is the FUEL FLOW at which each cylinder PEAKs on the EGT.

The GAMI Lean Test has you move the mixture knob VERY, VERY SLOWLY, and recording the FUEL FLOW as each peaks. If the last one is within 0.5 GPH of the first, THEN you're good.

Username Protected · **Posted:** 23 Dec 2014, 11:19

Username Protected wrote:

John, thanks that's what I was trying to do. My main focus is always on CHT. EGT is a side show by comparison.

Steve, forgive my bluntness, but you haven't got the picture yet.

DON'T SWAP GAMIjectors between cylinders! It's not only counterproductive, but illegal!

Regular injectors CAN be swapped around, but it's mostly an exercise in frustration, and if you're using CHT or EGT, to do it, you're going very wrong, guaranteed.

The ONLY way to do it is to use FUEL FLOW of the electronic pursuasion!

Username Protected · **Posted:** 23 Dec 2014, 13:50

Username Protected wrote:

John, thanks that's what I was trying to do. My main focus is always on CHT. EGT is a side show by comparison.

Steve, forgive my bluntness, but you haven't got the picture yet.

DON'T SWAP GAMIjectors between cylinders! It's not only counterproductive, but illegal!

Regular injectors CAN be swapped around, but it's mostly an exercise in frustration, and if you're using CHT or EGT, to do it, you're going very wrong, guaranteed.

The ONLY way to do it is to use FUEL FLOW of the electronic pursuasion!

421B are VG's a must have?