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Washington Metrobus question

 
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gogurt




Joined: 17 Apr 2011
Posts: 1
PostPosted: Sun Apr 17, 2011 2:27 pm    Post subject: Washington Metrobus question Reply with quote
Hi all,

I have to admit to knowing almost nothing about buses, but I had a question that I hoped you experts could help answer.

I live in the Washington DC area, and regularly commute via Metrobus. One thing I've always wondered about is the source of a "coughing" or "gulping" sound that the bus makes when the operator lifts off the accelerator. You can hear it in this video:

http://www.youtube.com/watch?v=MBZLsQ8MMXM

I'm pretty sure it only happens on these Orion buses, but am not completely sure. Any ideas for this curious commuter?

-Jimmy
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RailBus63
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Joined: 16 Apr 2007
Posts: 1063
PostPosted: Sun Apr 17, 2011 7:56 pm    Post subject: Reply with quote
Welcome to the board!

It seems to be unique to buses with Compressed Natural Gas (CNG) engines - I've heard the same sound on Orion V's with the Detroit Diesel Series 50G powerplant.

Jim D.
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