[Diy_efi] timeframe to get equal fuel distribution

[Bernd Felsche]

On Tue, Mar 18, 2003 at 06:43:53PM -0800, Adam Wade wrote:
> --- Bernd Felsche <bernie at innovative.iinet.net.au>
> wrote:

> > The power required to _move_the_car_ at a steady
> > 60kmh could be less than that to just turn the
> > engine at idle with no nett output.
> 
> Given a car with approx. frontal area of 1.7 m and a
> CD of 0.32, you will require approx. 2.5 bhp at the
> tires to maintain 60km/h on a calm day.  That should
> be a shade over 3 bhp at the crank.

I make it about 1.5kW

Rolling resistance is about that magnitude.  Around 2kW,
depending on surface, tyres and actual vehicle mass (calculation
based on 1.3t, modern radials and smooth surface ==> f=0.010).

Total around 3.5kW, less for lighter vehicles.

> I honestly don't know what the power output at idle is
> for an automobile engine.  Theoretically, exactly
> enough to oversome friction within the engine.  3 bhp
> seems like a lot.

It does, doesn't it.

Ancillaries: Esp. aircon (2 to 4 kW) and alternator (1 kW). Oil and
water pumping requirements are also not insignificant at idle when
the engine is cold.

-- 
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