You are correct, testing on a V8 doesn't necessarily translate to an inline 4 very well. I would love to see the show do some I4s, but I'm not holding my breath
I love seeing vids like this, especially the views down the individual runner. The setup was also pretty simple, just remove the fuel rail from it's normal location and mount it at the bell-mouth.
I was surprised that it seemed the injectors did a poor job of atomizing the fuel though. Lots of fuel droplets, less fuel vaporization. I wonder if different injectors, and/or higher pressures, and/or longer runners, would have produced better results?
I still believe injecting the fuel at the bell-mouth will cool the intake charge which will result in more power, if tuned correctly. I wonder if the test above measured AFRs, and, if necessary, corrected for them in the injector in the bell-mouth test? If the intake charge was cooled significantly, more fuel would be required. If no additional fuel was added, as in change the tune, I would think the power outputs would be very similar between the two tests (and that's what we saw.).
I would love to see a test that measures the cooling effect of race gas, E85, and pure alky injected at the bell-mouth
.
I think it should be relatively simple to add another set of injectors in the "normal" location to handle idle and part throttle. Then, once the throttle is opened up enough to produce some vacuum at the bell-mouth, fire the (high pressure) bell-mouth injectors too. That should produce a bit of a kick! To complicate things further - inject pure alky at the bell-mouth and race gas in the "normal" injector position.
Maybe I should write Engine Masters with the suggestion? Who knows, they are getting a little stagnant, and they did a an I6 before... (I would even offer up a test engine
.)