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Re: (erielack) ALCOS
Being out railfanning on the Delaware Lackawanna today I saw some first
hand examples of Alco's and smoke. One of the better relations I've heard
on this matter was this off of Trainorders some time ago:
" Most transient diesel smoke is caused by turbo-lag. There is too much
fuel being injected into the turbo-charger until to comes up to speed to
provide sufficient boost. EMD engines had a big advantage in that the non
turbo-charged engines had an engine driven super-charger (Roots blower)
and had a gear drive with an over-running clutch. At low power, the
turbo-charger was engine driven while at high power it was driven by the
exhaust turbine. Newer GE engines avoid this problem by controlling the
amount of fuel injected while the turbine comes up to speed."
FWIW
Rich Onorevole
On Thu, Oct 11, 2012 at 12:28 PM, Ed Montgomery <etmontgomery46_@_gmail.com>wrote:
>
> Here's a question that has been in my mind for the last few days:
>
> Alco engines always seemed to accelerate with a blast of dark exhaust
> coming out the stack. I remember hearing this was caused by the
> turbocharger lagging. Could this have been corrected or was it part of the
> engine design? Was it common to all ALCO engines? I heard stories of
> fires breaking out around the exhaust stack of the PA's. Was this common
> to the RS and S units as well?
>
> Ed Montgomery
>
>
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