GAMI Injectors

[patrolpilot]

Anyone switch to them?

[wslade2]

I was having temp spread issues and some roughness. Cleaning OEM injectors plus doing some other things didn’t resolve. OEM injectors looked rough, corroded screens, easy to imagine poor spray patterns from cylinder to cylinder. GAMI definitely helped. Also I recall they were cheaper than replacing with OEM’s.

Continental now doing their own “GAMI thing”....imitation one of the best compliments

[patrolpilot]

Thanks. Same thing here. I'm ordering them and will have them installed at my next oil change in 3 to 4 weeks.

[Mich3773]

I installed them on the front engine a few years ago and am very pleased with the results; engine feels like it's running smoother, CHTs and fuel flows are equal. Note that it took three attempts to get the correct sized injectors.

[wslade2]

Be sure to note that they are a matched set. There are specific injectors for each cylinder. Also keep track of the old injectors. They will want them back for core.

[n86121]

Turbo 337D

On my last annual wallet-ectomy
both fuel pumps were bench overhauled with precision.
Rear throttle housing was also leaking, so it also got the treatment.

Suffice to say, whole fuel thing gone through.

My rear engine had two gnarled injectors from prior annual, that needed replacement.
TCM was back logged on injectors for months, but GAMi available next day
Decision made, went to set of GAMI

Given both precisely bench OH fuel pumps...
the two engines would otherwise seem well matched

No fancy engine analyzer.
Never saw the need.
Fuel not a major lineitem in my life, and $10,000+ cost to install F&R buys a lot of fuel.

I just find the leaner EGT, set it to 75-100F rich of peak,
then match fuel flows between engines, to keep my shadin having same flow rates F&R.

That said,...

The rear GAMI equipped engine needs almost no mixture adjustment throughout its range.
Really, almost zero. Nada. Zip.
It is as if the full range is just super precise and super narrow, full range.
While the rear I still have to fuss with mixture to get similar flows on front.

So next wallet-ectomy, going to add GAMIs on front too.

Thoughts?

[wslade2]

Sounds like a good plug for GAMI’s.

However:
You had both your fuel pumps overhauled and rear throttle rebuilt. If rear needed overhaul, your front throttle might too. It controls the flow and my interpretation of fussy means your constantly having to adjust it. That could indicate irregularities in flow. Take a close look. Realize it doesn’t have to leak outside, can leak into throttle throat too. Or internals might just be worn.

Also, you had two rebuilt pumps. I likewise just went through that. Coming from a good shop, they’re bench tested and adjusted. We hope for “plug and play”. But continental has a document outlining fuel pump adjustment. My pumps came with tags reminding to adjust my pumps to my specific engine. Idle, idle mixture, idle pressure and full power pressure to be adjusted. One pump was pretty close, but the other was fair amount off on full power pressure setting (yes at takeoff power 2700 rpm on the ground with pressure gauges hooked up). After all those adjustments dialed in, I could tell even more of a difference.

Just some things to check out.

[patrolpilot]

Thanks, fellows. I will get the injectors ordered this week.

[hharney]

The newer tuned Continental injectors are probably just as good as GAMI
I tested them with my new reman engine on the front and after putting my GAMIs back in I could not see any difference from the Continental tuned injectors

Now saying that when I installed the GAMIs originally before I installed the new reman engine there was a HUGE difference with the GAMIs. I also installed fine wire plugs (Tempest) and an engine monitor. Huge improvement, did some LOP tests too. Couldn't do that with the stock injectors. GAMIs and Tempest fine wire plugs really smoothed out the engines, cooling, low CHTs and LOP option