fuel evaporation & injectors
Chris Conlon
synchris at ricochet.net
Fri Jan 9 20:17:07 GMT 1998
Gary wrote:
> With non sequential port fuel injection, fuel puddles behind the intake
> valve. When the valve opens, residual exhaust blows it upstream causing
> good vaporization. Other things to try are heating the intake air and
> heating the fuel. I believe Honda's last turbocharged Formula 1 engine
> heated the fuel to 70 degrees C. Gasoline has an end point around 300
> degrees. If you heat it to 150 or so, much of it will vaporize as it comes
> out of the injectors. Heat it to 300 and you can be injecting vapor. Under
> pressure in the fuel rail it would be liquid. As it flowed past the
> injectors, it would flash into vapor.
Apart from the danger, & probably fried injectors, it sounds like fun! ;)
If I get my own cone shaped hat, can I try it??? **j/k!!**
This reminds me, what's the deal with Mitsubishi's GDI (gasoline direct
injection?) engines? Is this a diesel type setup? I can't get anything but
Mitsu's hype about more power, less emissions, more mileage.
I did talk to RC Engineering, thanks all for the suggestion. They did agree
that fuel evaporation is often incomplete, but didn't seem to see this as a
problem. (Obviously FI *does* work.) I plan to satisfy my tweak compulsion by
putting my additional injectors either in the throttle body or just after
the supercharger, and picking very fine spray units. Good enuff I guess.
Plus I may put a temperature sensor on the fuel rail; perhaps part of the design
is that the rail itself will get pretty warm. If so, that's kinda elegant.
Chris C.
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