I think I have uneven airflow....

[rv6ejguy]

Originally Posted by carrollcw

The superior sump's plenum appears to be more smoothed and polished than the ECI one, but besides that, hard to tell any difference.

So the angles that the runner inlets connect to the common hole are not equal and no added volume at the collection point? Appreciate the back to back test. My theory is any sump with tube different angles and minimal plenum volume is unlikely to give near equal airflow. This is why I like the Sky Dynamics setups, plus they were developed with CFD which may be superior to the Mk 1 eyeball and intuition.

[Boyd Birchler]

20 years or so ago, long before anyone knew about GAMI injectors a fellow wrote about his Mooney 231 that had a TSIO-360GB engine. These engines had such poor mixture distribution that if Continental got them back at the factory they changed all of them to an LB version with a better induction system. It was common during cruise with the GB engine to have 2 cylinders with CHT's 150*F higher than the coolest 2.

One gentleman who had a GB version (bad) took his induction tube gaskets where they attach to the cylinder flange and made smaller diameter gaskets for 2 rear cylinders a little larger for the middle cylinders and stock for the front. It was a bit crude but the engine ran much more even distribution with better CHT's temperature sspreads.
This was prior to any thoughts of LOP. The modification never received a multiple STC.

[BillL]

Originally Posted by Boyd Birchler

20 years or so ago, <snip>
This was prior to any thoughts of LOP.

I worked at Conti engineering in '86/87 , they knew about LOP - very well.

[rv6ejguy]

LOP operation has been around since the Mid '40s and so has bad mixture distribution...

We're working on an electronic "solution" for this issue.

[carrollcw]

Ross, I'm looking forward to this electronic fix as I have exhausted all other remedies!!!!

[rv6ejguy]

Jan. 22 will see the release of V26 software featuring 100rpm increment programming and optional cockpit adjustable individual cylinder fuel trim for 4 cylinder engines.

[Mike H]

Originally Posted by rv6ejguy

Jan. 22 will see the release of V26 software featuring 100rpm increment programming and optional cockpit adjustable individual cylinder fuel trim for 4 cylinder engines.

SWEET! Will this software be useable in older EFII systems with the original ECUs?

[rv6ejguy]

Originally Posted by Mike H

SWEET! Will this software be useable in older EFII systems with the original ECUs?

We'll be able to do upgrades starting in Feb. on any EM-5 ECUs (produced after Sept. 9, 2011). Not applicable to EM-4 ECUs. If you have a programmer, you can check what board you have by powering up the system. In the initial bootup screen it will have the software version number- V17, V20 etc. You have an EM-5 board if you have V20 or higher. If you don't have a programmer, you can remove the top cover and look at the board series printed in large letters on the board. Anything starting with EM-4X is EM-4, anything with EM-5X is EM-5. EM-4 enclosures can have the board replaced with an EM-5 board in order to have the new capabilities.

There are minor wiring changes required (swapping pins on the white ECU connector) to synch ECU pins with the correct injector. Instructions will be provided by us.

[Mike H]

Thanks. I will forward this information to my hangar partner. His EFII system is bout a year old and should have the EM-5 ECUs. His -7 is getting close to being ready for the first engine start.

[rv6ejguy]

Here is a short video showing how to trim individual injector fuel delivery: https://www.youtube.com/watch?v=sEv4UMLOICc