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Re: Question for Hot Water
Author: Hot Water
Date: 10-26-2019 - 15:22
PJ Wrote:
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> Jack, what do you know about the SD9 that ran on
> the Leadville to Climax branch in Colorado that
> had a different blower arrangement to supply the
> engine with more air at high altitude?
Must admit that I never heard of that.
Was it
> different gears in the blower drive that just spun
> a standard roots blower at a higher RPM?
That would be the most logical modification, i.e. change the blower drive gears in the camshaft drive, rear gear train. Such was done when up-grading 567 engines to 645 power assemblies, necessitating the increased speed of the roots blowers, and different fuel injector tips.
Or was
> there more to it than that?
I serious doubt that.
Do you (or anyone
> else) know of any documentation on this
> modification?
No, as most likely the CB&Q made the modification themselves, with technical advice from EMD.
It seemed to work - the 828 appeared
> to run pretty clean up there. Other engines
> assigned there didn't seem to do as well. Thanks
> for any info anyone can provide.
>
> Phil
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> Jack, what do you know about the SD9 that ran on
> the Leadville to Climax branch in Colorado that
> had a different blower arrangement to supply the
> engine with more air at high altitude?
Must admit that I never heard of that.
Was it
> different gears in the blower drive that just spun
> a standard roots blower at a higher RPM?
That would be the most logical modification, i.e. change the blower drive gears in the camshaft drive, rear gear train. Such was done when up-grading 567 engines to 645 power assemblies, necessitating the increased speed of the roots blowers, and different fuel injector tips.
Or was
> there more to it than that?
I serious doubt that.
Do you (or anyone
> else) know of any documentation on this
> modification?
No, as most likely the CB&Q made the modification themselves, with technical advice from EMD.
It seemed to work - the 828 appeared
> to run pretty clean up there. Other engines
> assigned there didn't seem to do as well. Thanks
> for any info anyone can provide.
>
> Phil
| Subject | Written By | Date/Time (PST) |
|---|---|---|
 Question for Hot Water
|
PJ | 10-26-2019 - 14:02 |
|
Re: Question for Hot Water |
Hot Water | 10-26-2019 - 15:22 |