SMRT New Euro-V Mercedes-Benz OC500LE WAB bus (Part 1)
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Originally posted by Raraken:
Is this the reason MB discontinued the OM906hLa Citaro engine? Heard it wasnt efficient. And the part about larger displacement = lower FC was not what I meant. What I meant was if Cleaner Engines had lower FC.
May I know why STA bought the B12BLE? Saw some pics of them operating in urban environments with a light load.
The 6.4-litre 6-cylinder Mercedes-Benz OM 906 hLA engine is still in production and comes as standard on the Citaro city bus. There is now only one power rating available - 210kW / 1120Nm. As you can expect, this engine is now Euro 4/Euro 5/EEV compliant with BlueTec technology. This engine is adequate for rigid buses used for low-speed inner-city operations or long-distance cruising where acceleration is not important.
In addition, a 7.2-litre 6-cylinder Mercedes-Benz OM 926 LA engine is available (albeit in a vertical arrangement only). This engine ships as standard with Mercedes-Benz O 500 U (OH 1830 LE) chassis'. This engine has two ratings - 221kW / 1200Nm and 240kW / 1250Nm.
Regarding fuel consumption vs. emissions, it is often the case that low consumption does not equal lower emissions. There are basically two methods used by truck and bus engine manufacturers to minimise emissions - Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR). EGR aims to reduce in-cylinder formation of NOx by reducing combustion temperatures with the aid of cooled exhaust gases recirculated through the intake system. SCR is an aftertreatment system that uses a urea solution to chemically convert tailpipe NOx emissions into nitrogen (N), water (H2O) and carbon dioxide (CO2). As the output from catalytic converters contains carbon dioxide, emissions of this greenhouse gas are often higher on emissions-certified vehicles (note that Euro emissions standards do not state a limit for CO2). To make matters worse, modern buses are extremely heavy - up to 11-13 tons tare from an average of 10-11 tons tare a decade or so ago. This added weight (mainly from emissions control equipment and safety equipment) causes increased fuel consumption, even though emissions are lower than ever.
As for Sydney buying B12BLEs, they probably chose them over everything else because of dollars and (lack of) cents (sense). Reportedly, the B12BLEs use 60L/100km on Sydney's streets compared to 40L/100km for similar Mercs!
Regards,
Dave -
Originally posted by Raraken:
Anytime soon WL is going to get OCs? I've been told that WLDEP is full and thus cannot accept any more buses. Is there any chance a few services (like 173) could be transferred back along with some buses? I think WLDEP is too overstretched as it is.
That I dunno. But AM and KJ are probably going to get the bulk of the 132 OCs, with AM getting most of it. WL might not be getting any at all, or at the very least, a minimal number.
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Originally posted by Powered_By_CNG:
The 6.4-litre 6-cylinder Mercedes-Benz OM 906 hLA engine is still in production and comes as standard on the Citaro city bus. There is now only one power rating available - 210kW / 1120Nm. As you can expect, this engine is now Euro 4/Euro 5/EEV compliant with BlueTec technology. This engine is adequate for rigid buses used for low-speed inner-city operations or long-distance cruising where acceleration is not important.
In addition, a 7.2-litre 6-cylinder Mercedes-Benz OM 926 LA engine is available (albeit in a vertical arrangement only). This engine ships as standard with Mercedes-Benz O 500 U (OH 1830 LE) chassis'. This engine has two ratings - 221kW / 1200Nm and 240kW / 1250Nm.
Regarding fuel consumption vs. emissions, it is often the case that low consumption does not equal lower emissions. There are basically two methods used by truck and bus engine manufacturers to minimise emissions - Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR). EGR aims to reduce in-cylinder formation of NOx by reducing combustion temperatures with the aid of cooled exhaust gases recirculated through the intake system. SCR is an aftertreatment system that uses a urea solution to chemically convert tailpipe NOx emissions into nitrogen (N), water (H2O) and carbon dioxide (CO2). As the output from catalytic converters contains carbon dioxide, emissions of this greenhouse gas are often higher on emissions-certified vehicles (note that Euro emissions standards do not state a limit for CO2). To make matters worse, modern buses are extremely heavy - up to 11-13 tons tare from an average of 10-11 tons tare a decade or so ago. This added weight (mainly from emissions control equipment and safety equipment) causes increased fuel consumption, even though emissions are lower than ever.
As for Sydney buying B12BLEs, they probably chose them over everything else because of dollars and (lack of) cents (sense). Reportedly, the B12BLEs use 60L/100km on Sydney's streets compared to 40L/100km for similar Mercs!
Regards,
DaveHmm. Puts everything into a clearer perspective. Thanks Dave.
The OCs seem a bit extreme as in some have very good performance while some have bad performance. Also, I think the Gemilang body doesn't have the sense of quality the Habits and Volgrens have. Saw a few oddities and defects on some OCs.
Hopefully OC500UA can be bought! 326PS IIRC.
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Yesterday SMB1H on 75
Today SMB1H on 700 -
Originally posted by Raraken:
Hmm. Puts everything into a clearer perspective. Thanks Dave.
The OCs seem a bit extreme as in some have very good performance while some have bad performance. Also, I think the Gemilang body doesn't have the sense of quality the Habits and Volgrens have. Saw a few oddities and defects on some OCs.
Hopefully OC500UA can be bought! 326PS IIRC.
Quality control at Evobus Ibérica is questionable as well. The Australian OC 500 LEs suffer from the same performance variances.
Also, Mercedes-Benz does not offer an articulated bus chassis in Australasia. They want operators to buy the Citaro G. The closest production chassis is the O 500 UA developed by Mercedes-Benz do Brasil using an OM 457 LA engine with EGR (apparently in South America there is much resistance against SCR solutions) developing 260kW / 1600Nm.
Regards,
Dave -
SMB5Y on 700
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Originally posted by Powered_By_CNG:
As for Sydney buying B12BLEs, they probably chose them over everything else because of dollars and (lack of) cents (sense). Reportedly, the B12BLEs use 60L/100km on Sydney's streets compared to 40L/100km for similar Mercs!
Regards,
Dave
No wonder the trend now is for 7-litre city buses!
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Guys:
SMB24 - SMB33 are all deployed to AMDEP. None to KJDEP or WLDEP for this batch.
SBS877M
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Originally posted by SBS877M:
Guys:
SMB24 - SMB33 are all deployed to AMDEP. None to KJDEP or WLDEP for this batch.
SBS877M
Woah thats 10 buses altogether... -
Originally posted by ^tamago^:
No wonder the trend now is for 7-litre city buses!
There are several reasons why 6 and 7-litre engines are now popular.
* Engine design is now such that a 6 or 7-litre engine can provide adequate power and torque to haul an 18-ton city bus or even a 28-ton articulated bus, especially if brisk acceleration or top speed is not important (e.g. within large, congested cities in Europe).
* The perceived increase in fuel economy and efficiency due to downsizing.
* Packaging constraints: 6 and 7-litre engines are smaller and more lightweight than 11 or 12-litre engines. Therefore they can more easily fit within the constraints of a low floor bus chassis.
Regards,
Dave -
Originally posted by SBS877M:
Guys:
SMB24 - SMB33 are all deployed to AMDEP. None to KJDEP or WLDEP for this batch.
SBS877M
Cool, thanks.That makes AMDEP having 21 Merc OC500LE fleets whereas KJDEP had the remaining 12.
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Originally posted by Powered_By_CNG:
There are several reasons why 6 and 7-litre engines are now popular.
* Engine design is now such that a 6 or 7-litre engine can provide adequate power and torque to haul an 18-ton city bus or even a 28-ton articulated bus, especially if brisk acceleration or top speed is not important (e.g. within large, congested cities in Europe).
* The perceived increase in fuel economy and efficiency due to downsizing.
* Packaging constraints: 6 and 7-litre engines are smaller and more lightweight than 11 or 12-litre engines. Therefore they can more easily fit within the constraints of a low floor bus chassis.
Regards,
Daverighto...
From the above disucssion does the Co2 "high" emmisions still apply if its a Fuel cell Citaro?
ZYX
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Originally posted by ZYX2005:
righto...
From the above disucssion does the Co2 "high" emmisions still apply if its a Fuel cell Citaro?
ZYX
Unfortunately, most of the emissions associated with running a fuel-cell bus is created during the hydrogen production and transporting process. No CO2 comes out of the tailpipe though because fuel-cell buses rely on electric motors that are powered by the fuel cells instead of internal combustion engines.
Regards,
Dave -
SMB27J on Sv 851. today seem like a lot of OC on Sv 851. Saw 19/23/27 within a space of few mins in both directions
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Over at CCK Interchange:
- SMB14X on 925
- SMB18K on 307 (Suprisingly, the rear door had no problems!)
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Unknown OC500LE on 970 spotted at Commonwealth Ave in the direction to Shenton Way 1pm+.
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Just asking, may I know the timings of OCs on svc 307 from CCK Int on 21 Nov (Fri), between 0830-0900? I want to take it.
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Originally posted by dinierazin:
Over at CCK Interchange:
- SMB18K on 307 (Suprisingly, the rear door had no problems!)
Confirmed that KJDEP fixed the rear door..Anyway, i spotted SMB16R on svc 307 (KJ SP)
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since ive never tried this bus yet, could anyone help me find routes with plenty of this bus cameoing since most does not have perms yet. [other than svc 811,851]. your help is appreciated =)
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Originally posted by scaniaB7RLE:
since ive never tried this bus yet, could anyone help me find routes with plenty of this bus cameoing since most does not have perms yet. [other than svc 811,851]. your help is appreciated =)
67. 851. 811. 812. 190. 700/700A. 106. 77. 75. 184. 307.
All these have several OC500LEs. But 851 is probably your safest bet with like 6 of them.
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SMB26L is on 851 today.
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SMB 0006U
( 077 KJDEP -->189 KJDEP )
SMB 0011D
( SP KJDEP --> 189 KJDEP )
SMB 0013Z
( SP KJDEP --> 189 KJDEP )
SMB 0014X
( SP KJDEP --> 189 KJDEP )
SMB 0015T
( SP KJDEP --> 189 KJDEP )
SMB 0016R
( SP KJDEP --> 189 KJDEP )
Info from BBT Int Roster
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Originally posted by TIB 589B:
SMB 0006U
Info from BBT Int Roster
Kind of expected. It was missing from 77 for quite a while.
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Originally posted by TIB1049L:
SMB26L is on 851 today.
I saw it at rochor canal rd just now in the afternoon from SBS3858Z.SBS3858Z was just in front of SMB26L. -
SMB17M on 172 today.there were 3 SLs inside the bus when it was parked at Boon Lay Int.then when it was about to depart,the driver picked up another SL.then the bus went off to pick up the passengers with the 4 SLs inside.