The Stovebolt Site Forums The Shop Area Engine Shop sequential fuel injection

If anyone is interested, I ran into a fella last week that used to tune 1700 HP twin turbo vipers. He told me about AEM engine management system, it is after market processor, that could be very easily setup to run sequential fuel injection on these engines. I looked it up, looks like a winner to me.

In my decidedly biased opinion, SEFI is the best possible method of fuel management. The first one I remember working on was the Buick 3.0 Liter V6 in the mid-1980's, when everybody else was using a very primitive throttle body setup. The advantage to a sequential system is that it fires the injectors one at a time like an ignition distributor, a fraction of a second before the intake valve opens. Since the injector nozzle is aimed into the port pointing right at the valve, a cloud of vaporizing fuel hits the tulip area of the valve just as it's opening. All the fuel intended for that cylinder gets into the right place, not some random volume of poorly-vaporized gas that's floating around in the manifold. SEFI produces more uniform power, and better fuel economy than either carburetion or TBI injection. The trick would be writing a specific programming sequence for the stovebolt engines. The problem that comes to mind right away is the siamesed intake port configuration, but since the firing order separates the cylinders for the shared ports by several positions, that can probably be dealt with adequately.
Jerry

Oh yeah, that should be easy enough to handle. It seems like this would be a great way to pick up some mileage ? He said GM peripherals were the easiest, but pretty much anything will work. I have a wayne head, so I have 6 nice open intake ports to work with.

Lots of discussion about this over at inliners.org. The problem with the siamesed ports results in a phenomenon called "charge stealing" where some of the fuel charge from the injector goes to the other port than it was intended. and it's unpredictable.

regards,
Leon

That's why I've always considered that adding 21st.-Century technology to a stovebolt engine designed in the 1920's is like putting lipstick on a pig. Let the rice rocket jockeys with their "bumblebee on steroids" 4 cylinder engines play computer tuning games. Those engines were designed for that kind of tinkering!
Jerry