[Spridgets] Cross Flow Quesiton - Turbo Question

[Greg Gowins]

Wow, I must have started my Cinco de Mayo celebrations a bit early
yesterday.  I completely whiffed on the magic air to fuel ratio of 14:1.

On Wed, May 5, 2010 at 4:58 PM, Greg Gowins <eric.t.cartman at gmail.com>wrote:

> Understood.  But my recollection was that the reason it wouldn't run lean
> was that the turbo/supercharger changed the amount of pressure because it
> was forcing the extra air in, over the same volume of air at a normal level
> of pressure.  Kinda like how water boils at a lower temp at high altitudes
> because of the less dense air, more energy is released from the fuel due to
> higher pressure.
>
>
> On Wed, May 5, 2010 at 4:52 PM, <WeslakeMonza1330 at aol.com> wrote:
>
>>  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 at 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.