Atomisation

[Greg Hermann]

At 11:40 AM 12/10/01, bill.shurvinton at nokia.com wrote:
>Interesting...I must admit that I had thought that, under part throttle,
>as the runner velocity was low it was better to inject at the narrowest
>point. I hadn't thought about whether the poorer atomisation would
>countermand this.
>
>I guess we are assuming here that a TBI system will have a larger ID
>than the carb as it will not need a venturi?
>
>Bill

I think Dave is more onto the point that there is sonic flow going past the
edges of the throttle butterfly with a TBI at part throttle which does a
pretty respectable job of atomizing the fuel.

Greg
>
>-----Original Message-----
>From: ext Dave Williams [mailto:dave.williams at chaos.lrk.ar.us]
> Running throttled, steady state - yes.  A TBI system can match a
>carburetor under those conditions, but a port injection setup can't.
>
> Part-throttle cruise is where carbs and TBIs rule, but that doesn't
>play much of a part in EPA smog or mileage testing.  They assume
>everyone lives in an anthill of traffic.  However, for some of us, part
>throttle cruise is the dominant driving mode.
>
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