SBS Transit orders 900 buses from Scania (Part 2)
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Originally posted by azharjj:
SBS8264D skipped... =.=
Er, I wonder why the 84xx series has stopped registering for a while =D
Maybe SC Auto is busy with other stuff...
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Originally posted by Powered_By_CNG:
The transmission is fully customiseable in terms of gearshift points. The vehicle manufacturer (in this case, Scania) sets the gearshift points to suit the engine (minimum consumption). If the operator wishes to optimise the gearshift points for power or a compromise between power and economy, this is easily done via computer.
Also FYI, the Scania DC9 engine isn't particularly powerful.
Regards,
Dave
If comparing horsepower, yes it isnt that powerful.230bhp vs 245bhp of THD102KF
So far, have not felt the engine's full potential before.
But this engine has tons of torque available from low down the rev range.
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Originally posted by jp_sean:
If comparing horsepower, yes it isnt that powerful.230bhp vs 245bhp of THD102KF
So far, have not felt the engine's full potential before.
But this engine has tons of torque available from low down the rev range.
But if you're comparing new buses, even in real-life situations (forget about paper specifications), you will find that the Scania DC9 is not particularly torquey at below 1100rpm. The Volvo D9B seems to be a better engine (on paper) simply because it uses SCR aftertreatment instead of EGR, even though the displacement is roughly the same. It is inevitable that the Scania DC9 will have more torque down low compared to the Volvo THD102KF - how many years older is the latter?!?!
Take note of how difficult it is for Scania to meet Euro 5 and EEV with an EGR engine - they had to increase the bore from 117mm to 120mm (stroke remains at 130mm) - other manufacturers who are using SCR just need to up the AdBlue injection levels. MAN are having the same problems with their EGR engine. The problem is that EGR does NOTHING to neutralise exhaust gases AFTER they are produced which is the whole idea behind SCR. With the exhaust gases treated, SCR engines can be tuned to run at their full potential without exceeding current (and future) Euro emissions norms.
Regards,
Dave -
Originally posted by Acx1688:
Spotted in the evening, SBS8255E >>> AM 13
seen 8250T on 13 on monday, 8256C and if i didn't remember wrongly 8253K did 13 yesterday. all of them probably did 13 on monday.
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juz seen a off service KUB today, w e front n side EDS showing SBSTransit logo, exactly like those painted on them!
(believed to be off svc 62A)
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Originally posted by AEW5001:
juz seen a off service KUB today, w e front n side EDS showing SBSTransit logo, exactly like those painted on them!
(believed to be off svc 62A)
morning dun haf sv62A plz. -
SBS8266Z spotted in Changi Airport T2 today at about 4pm with some BCs onboard, EDS displayed as "off service". The BCs should be undergoing some training.
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Originally posted by TIB1018B:
SBS8266Z spotted in Changi Airport T2 today at about 4pm with some BCs onboard, EDS displayed as "off service". The BCs should be undergoing some training.
jus guessing, if BNDEP, den maybe sv 36 training
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jus asking, got anymore other sv doing KUB training.
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Today when I took a K230UB on Svc 151, an old lady complain to the driver why the bus vibrate and shake so much.
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Originally posted by scaniaB7RLE:
jus guessing, if BNDEP, den maybe sv 36 training
Bus need not be under bndep to do the training, although it may be a bndep service. -
Originally posted by chickenlittle2:
Today when I took a K230UB on Svc 151, an old lady complain to the driver why the bus vibrate and shake so much.
Is it because of the material quality that doesn't insulate vibrations well? -
Originally posted by sbs&tibs:
Is it because of the material quality that doesn't insulate vibrations well?
Gemilang bodywork is not the cause of vibrations, can be infered from the Gemilang bodied MAN. The problem is the Scania engine. -
Originally posted by TIB1018B:
SBS8266Z spotted in Changi Airport T2 today at about 4pm with some BCs onboard, EDS displayed as "off service". The BCs should be undergoing some training.
SBS8266Z driven by Sv5 perm BC, bus returned to depot at 5pm
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Originally posted by SBS2695H:
Gemilang bodywork is not the cause of vibrations, can be infered from the Gemilang bodied MAN. The problem is the Scania engine.
I am saying about the MATERIAL used for those new buses like B9TLs and those new SDs. I understand that the problem lies with Scania engine, it seem fibreglass can't insulate the entire vibrations, compared to older buses using metal. -
Originally posted by SBS2695H:
Gemilang bodywork is not the cause of vibrations, can be infered from the Gemilang bodied MAN. The problem is the Scania engine.Can be both ways. Vibrations of high amplitude occurs when the idle frequency of the bus engine is near the natural frequecy of the bus bodywork, otherwise known as resonance. So it could be that the Gemilang body is the problem. The Gemilang body has a natural frequency close to the engine idle frequency. Hence Gemilang is the cause. Or the Scania engine has an idle frequency close to the natural frequency of the bodywork. Hence its Scania's fault.
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Originally posted by sbs&tibs:
I am saying about the MATERIAL used for those new buses like B9TLs and those new SDs. I understand that the problem lies with Scania engine, it seem fibreglass can't insulate the entire vibrations, compared to older buses using metal.Probably due to the lack of installation of dampers. Or poorly maintained engines, which have a different idle frequency from the manufacturer prescribed frequency.
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In many instances, vibrations at idle occur because the engine is idling too low, for example, at 500rpm instead of the prescribed 600rpm. This is easy for mechanics to adjust, but most will generally not be bothered to adjust it unless a driver complains.
CNG engine suffer from a slightly different problem - constant and continuous variations in idle speed. Although CNG engines produce little vibration (even at low idle speeds), the varying idle speeds can be particularly noticeable, especially if the bus is equipped with a ZF transmission with the NBS feature. The variations occur because of a combination of the following reasons:
1. Fluctuations in power demand by auxilliary devices (mainly air-conditioning, power steeing).
2. Slow response of fuel delivery system associated with a change in power demand, as fuel is introduced into the engine outside of the combustion chambers. The slow response of the system may cause the engine controller to over-compensate, causing oscillations that may last a few seconds. To make matters worse, most CNG fuel systems will deliver fuel at the throttle body, a long way from the engine, making fuel control response even slower. This is why CNG buses (particularly earlier models) tend to have problems with stalling, particularly after heavy braking.
3. At idle, the throttle is almost closed, so a slight opening or closing of the throttle plate results in a dramatic change in airflow, causing engine speed to vary accordingly. In contrast, at cruising speed, the throttle is in a more open position, where variations in the angle of the throttle plate will cause minimal engine speed change.
Regards,
Dave -
then it seems SBST made a wrong choice to buy so many KUBs, just only around 1yr of svcs
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There were 2 consecutive K230UB on sv48 in the direction of Buona Vista & UEC between 2215 hrs & 2230hrs on 24/7/2008
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i tink SBST should take a hard look at it's bus replacement programme, what happened 12-17 years ago should not apply now, it should buy more DDs rather than SDs as population has indeed increased and most svcs need a few DDs to support[ignore CGA buses]. It will be more efficient rather to have more BCs which are getting more and more difficult to hire
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Originally posted by Acx1688:
i tink SBST should take a hard look at it's bus replacement programme, what happened 12-17 years ago should not apply now, it should buy more DDs rather than SDs as population has indeed increased and most svcs need a few DDs to support[ignore CGA buses]. It will be more efficient rather to have more BCs which are getting more and more difficult to hire
Dun forget more MRT lines.. They are slowly replacing bus routes. -
Originally posted by Acx1688:
i tink SBST should take a hard look at it's bus replacement programme, what happened 12-17 years ago should not apply now, it should buy more DDs rather than SDs as population has indeed increased and most svcs need a few DDs to support[ignore CGA buses]. It will be more efficient rather to have more BCs which are getting more and more difficult to hire
I fully agree with you.Originally posted by chickenlittle2:
Dun forget more MRT lines.. They are slowly replacing bus routes.
The bus routes can continue to run despite the new MRT lines, as a good alternative to the packed MRT. -
Originally posted by SBS2695H:
I fully agree with you.
The bus routes can continue to run despite the new MRT lines, as a good alternative to the packed MRT.
u need to cut freq/axe the route in order to induce demand on the MRT. -
SBS 8456S on Sv 100 on 25th July 2008