Bx41 Wakefield Posted March 28, 2010 Share #1 Posted March 28, 2010 What was the reason for this change to buses? Also I noticed some of the older Orion Vs had their tailpipes moved to the top. I've always wondered why. Link to comment Share on other sites More sharing options...
St Louis Car 09 Posted March 28, 2010 Share #2 Posted March 28, 2010 What was the reason for this change to buses? Also I noticed some of the older Orion Vs had their tailpipes moved to the top. I've always wondered why.Buses tend to breath better with the pipe on the top. remember earlier Orion 5s having their pipes on the bottom which slowed the acceleration some. Link to comment Share on other sites More sharing options...
Deaks Posted March 29, 2010 Share #3 Posted March 29, 2010 I'm not sure about the 'breathing' comment but a pipe at the top keep anything hot out of people's way - gasses plus the actual exhaust itself. They also don't blow dust and whatever else up off the road when they are at the top. Link to comment Share on other sites More sharing options...
St Louis Car 09 Posted March 29, 2010 Share #4 Posted March 29, 2010 I'm not sure about the 'breathing' comment but a pipe at the top keep anything hot out of people's way - gasses plus the actual exhaust itself. They also don't blow dust and whatever else up off the road when they are at the top. Right just like charter buses with exaust under the bus. Link to comment Share on other sites More sharing options...
NX Express Posted March 29, 2010 Share #5 Posted March 29, 2010 To make the exhaust pollute the air faster. Link to comment Share on other sites More sharing options...
ColumbiaDeath Posted March 29, 2010 Share #6 Posted March 29, 2010 They made the change so that I can draft behind busses on my bicycle without breathing pure exhaust fumes B) Link to comment Share on other sites More sharing options...
Amtrak7 Posted March 29, 2010 Share #7 Posted March 29, 2010 Isn't this some sort of EPA regulation? I remember reading on a forum (either here or RD) that the new batch of MCI's was cut short/delayed because the exhaust was superheated to a dangerous level in order to comply with an emissions regulation of some sort. I guess if the exhaust has to be deliberately made hotter, it's better to vent it into the air away from anything then onto the pavement with a relatively low melting point. Also what's with some Orion V's having a simple grille instead of a pipe coming out the top? Link to comment Share on other sites More sharing options...
Eric B Posted March 29, 2010 Share #8 Posted March 29, 2010 I noticed the move occurred when the switch was made to the DD50 and other two-strokes. So I figured it must have something to do with those engines. Link to comment Share on other sites More sharing options...
Bx41 Wakefield Posted March 30, 2010 Author Share #9 Posted March 30, 2010 To make the exhaust pollute the air faster. I thought that too, LOL! They made the change so that I can draft behind busses on my bicycle without breathing pure exhaust fumes B) LOL! Right just like charter buses with exaust under the bus. Yeah, the NF Vikings were the only coach buses I've seen with the pipe on top. Isn't this some sort of EPA regulation? I remember reading on a forum (either here or RD) that the new batch of MCI's was cut short/delayed because the exhaust was superheated to a dangerous level in order to comply with an emissions regulation of some sort. I guess if the exhaust has to be deliberately made hotter, it's better to vent it into the air away from anything then onto the pavement with a relatively low melting point. Also what's with some Orion V's having a simple grille instead of a pipe coming out the top? Possibly, that was another idea I had. I think those were the Older Orion Vs. I remember when they put the pipes on top I thought it was strange. Then all buses started having their tailpipes on top. Link to comment Share on other sites More sharing options...
w8Hou Posted March 30, 2010 Share #10 Posted March 30, 2010 This change of exhaust location is because of emission requirements by the EPA. There was a study a long time ago that the particulates would not be easily emitted from roof-mounted pipes. They are traped inside the engine for recirculation and ignition, which improves the overall exhaust air quality when its move on top. It is the main reason that they were repowered the RTS and Orion V 1990-1993 buses, to decrease the polluting emissions. Link to comment Share on other sites More sharing options...
St Louis Car 09 Posted March 30, 2010 Share #11 Posted March 30, 2010 This change of exhaust location is because of emission requirements by the EPA. There was a study a long time ago that the particulates would not be easily emitted from roof-mounted pipes. They are traped inside the engine for recirculation and ignition, which improves the overall exhaust air quality when its move on top. It is the main reason that they were repowered the RTS and Orion V 1990-1993 buses, to decrease the polluting emissions. Very true.Before the GOH of the RTS I remember when the pipe was under th bus,it would emit thick black smoke.But with the pipe on the top all you see is heat vapor. Link to comment Share on other sites More sharing options...
Bx41 Wakefield Posted March 30, 2010 Author Share #12 Posted March 30, 2010 This change of exhaust location is because of emission requirements by the EPA. There was a study a long time ago that the particulates would not be easily emitted from roof-mounted pipes. They are traped inside the engine for recirculation and ignition, which improves the overall exhaust air quality when its move on top. It is the main reason that they were repowered the RTS and Orion V 1990-1993 buses, to decrease the polluting emissions. Very interesting. Thank you, I'd always wondered the reasoning every time I see the pipe on top of buses. Link to comment Share on other sites More sharing options...
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