Sheesh. Google "specific fuel consumption." When you hear of a Sprite dyno'ing
at 150HP, ask what the SFC was. If it's .4, you know it's way bigger than the
.047 overbore allowed.
--- On Wed, 5/5/10, WeslakeMonza1330@aol.com
<WeslakeMonza1330@aol.com> wrote:
> From: WeslakeMonza1330@aol.com
<WeslakeMonza1330@aol.com>
> Subject: Re: [Spridgets] Cross Flow Quesiton -
Turbo Question
> To: eric.t.cartman@gmail.com, spridgets@autox.team.net
>
Date: Wednesday, May 5, 2010, 4:52 PM
> With a carb the amount of fuel dumped
> in is determined by the jets or
> needles so that even given carb at any
given engine speed
> (air flow) can be made
> to run rich. Same thing with
fuel injection if it's not
> set correctly,
> injectors too big etc.
>
> A
lot of factors limit how much AIR can be drawn into the
> engine
>
(volumetric efficiency??) and given you can always add more
> fuel to the air
than it
> needs (air/fuel mixture is too rich) it is the overall
> breathing
efficiency
> of the engine that limits power. The engine sucks in
> as much
air as it is
> capable of whether carb or injection.
>
> What a turbo or
super charger does is FORCE FEED AIR INTO
> THE ENGINE. The
> engine
doesn't suck air rather it has air pumped into it,
> sometimes at
> pressure
(tech difference between various types of
> supercharger and turbo
>
charging).
>
> More air = more fuel though it's still possible to get a
>
super or turbo
> charged engine to run too rich. It's also possible to
>
have to little fuel
> with just a carb (or injection) and super or turbo
>
charging.
>
> If the turbo or supercharger just put more air into the
>
engine for any
> given amount of fuel the engine would simply run lean and
>
make no more power
> than without a super or turbo charger.
>
>
Weslake-Monza 1330
>
> In a message dated 05/05/2010 22:22:24 GMT Daylight
>
Time,
> eric.t.cartman@gmail.com
> writes:
>
> With a carb, the amount of
fuel dumped in is
> determined by the speed of the
> air flow. So as more
CFM is fed in to the
> venturis, more gas is pulled in
> to the cylinder.
With a turbo or supercharger, it uses the
> same amount of
> fuel as
non-boost system, it just crams a lot more air in
> so that you get
> more
energy out of the fuel at combustion time.
>
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