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The EFI itch

D

David G

Well-known Member
I just cannot seem to stop not wanting to make improvements.

I am really curious how good the mixture balance is between the cylinders with common injection. I have found EGT probes that use 1/8 NPT, so gonna drill my exhaust manifold for it. This issue
should exist regardless of wether the engine is carbureted or injected, so I should be able to put carburetor back on and see similar results. The outer two cylinders should run lean on a siamese
manifold.

I should be able to go to timed injection and see the differences in EGT to get the correct mixture into each cylinder.
 

iirc there was a green magazine article a few months ago. A fuel injection jobber shop built a port injection system with O2 sensor feedback for a 4020 gasser.
The numbers were 10% more power on 20% less fuel.
Today's direct injected gasser is a long way from the bad old days with points and a carburator metering leaded gasoline.
Then again today's Tier IV diesel is a long way from a 1990's-early 2000's diesel.
 
Hello David G,

Lots of variables. Each subsequente combustion stroke on the same cilinder will produce a different power output. All the cyliders, even though get the same amount of fuel, do not contribute the same H.P. This is proven with an indicated H.P. test. Can that average combustion process among all cylinder be improved? I'd say yes, but is it cost effective? Direct innection is better the air fuel mix by far, although not perfect, certainly much better,

Guido.
 
You should be working with airplanes! The guys with money to spend on the fancy ones install balanced injectors, and monitor CHT and EGT on each cylinder individually. Some even run on the lean side of peak EGT. As I lean my old carbureted O-320 it will start to stumble on the rich side of peak!
 
I got manifold drilled and brass plugs put in
a221507.jpg
 
B&D

I have been researching and learning this as I go along. The tractor really runs good with an unbelievable amount of low end torque, but the engineer in me wants things to figure out. I believe the
cost for a 4 cylinder with injection and distributor less ignition is about a grand, that is not too extreme considering what a new carburetor and Pertronix kit costs. I have everything ready for the
electronic governor with drive by wire, but will probably do the port injection and upgraded hydraulics first.
 
Guido,

The best indicator of cylinder effectiveness is to trend the cylinder pressures, but the cost of doing that is much more than trending EGT. One of the 10,000 HP engines we have worked on for the NG pipeline has high pressure NG injection with cylinder pressure trending. It is really informative, you can see pre ignition, detonation, mixture and ignition timing results right on the screen for each cylinder. That conversion was right at a million bucks, so really out of my budget. The computer trims the injection for each cylinder to balance them.

The siamese manifold adds to the complexity, but that is part of the fun. I just want to be able to inject into each pair at the right time to get them close. I have no idea how far apart they are right now with common injection.
 
David you are spending time to use your talents to advance your knowledge. I don't see anything wrong with that. You are on a much higher level than me with this project anyway.
 
I have been following your progress on this project with interest and over the last little while I've been thinking about trying to convert one to fuel injection as well. Could I send you an email with some questions to get me started? I'll open my email on this post. Thanks, Sam
 
I flew a mechanical fuel injected T41 when living in NM, it is amazing how much leaner they would run than carbureted ones.
 
I too have a good chunk of time logged in a T-41, a B model. Probably what you flew as that one had the Continental IO-360D. Everyone ran it rich of peak until another instructor and I thoroughly read the manual. We were able to slice a good 2gal/hr off what everyone else was getting and with no ill effect.

That thing was a joy to fly. The school finally retired it (with some urging by our POI) with 13K worth of training flights on the airframe.
 
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