Quote:
Originally Posted by Ecky
Port fuel injected engines generally spray fuel early on the back of the hot intake valves before they open, which fully vaporizes the gasoline before it enters the cylinder.
Direct injection engines do not, of course, which I think (?) is why they produce soot. However, DI engines typically also get better fuel economy.
Gasoline vapor claims are unicorn material.
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I 100% agree with Ecky.
Well know ICE Professor of Mechanical Engineering John B. Heywood talk about this in several parts of his books.
Quote: "Unburn hydrocarbon levels in the exhaust of a spark-ignition engine under normal operating conditions are typically in the range of 1000 to 3000 ppm C1. This corresponds to between about 1 and 2 1/2 percent of the fuel flow into the engine."
Also, one of our present ICE Gods, Heinz Pitsch talk about this in detail.
The heavier compounds are there for a reason and they are the largest contributor to good FE due to their high energy content.
Several test have been done proving that the energy of gasoline is being burnt during the power stroke and can be measure by the coolant temps and exhaust temps.
The video that was posted "lawnmower carb guy" this guy is a scam artist!!! Several people have called him out on his YouTube page, and he just deletes the them. His test was only 40 miles. He's just making YouTube $$$ on the idiots that have no clue and want to believe in his magic because the cost of fuel right now.