The airflow defection of "butterfly" throttle plates as they open & close is
hard to deal with and flat "slider" throttle plates have been used in a
nimber of FI racing engines to overcome that problem.
I've also read quite a few reports of accidents/DNFs caused by slide
throttle plates being jammed open by dirt or gravel tossed up by tires. The
area required to slide the plate sideways looks like it would limit the
design of the intake, too.
What I've always wondered about is why someone hasn't tried a variable-
orifice throttle plate. If you look at how a camera iris works, you can see
the principal. It seeme to me that this method of throttle control would
overcome the others' drawbacks. Cost & complexity is another question.
Has anyone heard of this being tried?
Regards, Neil Tucson, AZ
-----Original Message-----
From: landspeedracer [mailto:landspeedracer@msn.com]
Sent: Thursday, April 25, 2002 2:43 PM
To: Land Speed List
Subject: Fw: To inject or not to inject...
----- Original Message -----
From: "Dave Dahlgren" <ddahlgren@snet.net>
To: "landspeedracer" <landspeedracer@msn.com>
Sent: Thursday, April 25, 2002 5:25 AM
Subject: Re: To inject or not to inject...
> It is pretty quiet here this morning so...
> On the carbs and injection.. everyone get a reality grip..
> Stop and look at what cars and motorcycles are doing that run in pro
classes,
> not drag racing either, or classes where induction is legislated.
> Find me the carbs on an F1 car, IRL car a CART car etc...
> While you are at it look for the plenum too..
> No carbs no plenum no mechanical FI
> You can sell yourself into what you think is best but in the larger
picture of
> things LSR is pretty retro tech for the most part. The difference between
a sbc
> with 2 carbs or a flathead with mechanical FI is the same difference
between
> shoeing horses and launching the space shuttle...
> The real deal is EFI done properly with slide throttles or roller
throttles.
> Expensive and complex but has no compromises either. Good bottom end good
top
> end great transient response, where legal better systems also have
injector
> stacks that change length on the fly as well according to rpm and load..
>
> forward this to the list if you like..
> Dave Dahlgren
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