Bus catches fire at Kent Ridge Terminal
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They have the same engine, but with different turbo versions.Originally posted by SBS3625D:Not sure if the 0405 and the 0405G share the same engine, but if that's the case, the increase in gross weight as well as the addition of a turbo-charger may be factors behind the higher proportion of burning bendies, because of the increased strain on the engine. -
hmm just to be clearer with your sentence , the increase in gross weight increases strain on the engine . The addition of turbocharger however , made the engine compartment hotter . If there isnt any adequate cooling system , the bus will be prone to overheating.Originally posted by SBS3625D:Not sure if the 0405 and the 0405G share the same engine, but if that's the case, the increase in gross weight as well as the addition of a turbo-charger may be factors behind the higher proportion of burning bendies, because of the increased strain on the engine.
That is the case for bendies that uses the same engine as rigids , with power output and other technical stuffs same . I cant say that for O.405Gs as i dont know much about them .
Haha ... Correct me if im wrong .
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There are also 4 Hispacold/Konvecta underfloor units in a bendy, and only 2 in a rigid. But if you use roof top units for bendies, they just need 2 rood top units and for a rigid, one is enough.Originally posted by Scania N113CRB luver:hmm just to be clearer with your sentence , the increase in gross weight increases strain on the engine . The addition of turbocharger however , made the engine compartment hotter . If there isnt any adequate cooling system , the bus will be prone to overheating.
That is the case for bendies that uses the same engine as rigids , with power output and other technical stuffs same . I cant say that for O.405Gs as i dont know much about them .
Haha ... Correct me if im wrong .
4 aircon units means the engine mneeds to power more energy means bus needs to generate more energy and would definitely be hotter than without any aircon unit, ceteris paribus. -
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I am making a guess that TIB1125A would be next soon. It has 2 vents at the rear and was found smoking when it left WRI in the morning today.
And do you notice that the buses burnt were actually ZF? Seems like Habit bodies aren't suitable for ZFs -
Me thinks that ZF gears usually rev the engine higher for fast acceleration. For next bus to catch fire, I think it should be Voith geared. When I pass by Volgren bendys on 962, I can sometimes hear the engine revving up to high rpms.Originally posted by TIB1049L:I am making a guess that TIB1125A would be next soon. It has 2 vents at the rear and was found smoking when it left WRI in the morning today.
And do you notice that the buses burnt were actually ZF? Seems like Habit bodies aren't suitable for ZFs
Habits and Volgren bendys use a turbocharged, intercooled engine which is supposed to help the engine produce more power at the same temp. But me thinks that the intercoolers on these buses could be damaged or non-functionable. -
Someone told me that the 1st batch Habits (ZF) weren't equipped with intercoolers , neither were the older bendies . Only the 1st batch Habits (voith) and 2nd batch Habits and Volgren bendies were equipped with the additional intercooler . The turbocharged engine , OM447hA produces only 900Nm whereas the Intercooled, Turbocharged engine , OM447hLA produces 1100Nm max .Originally posted by Raraken:Me thinks that ZF gears usually rev the engine higher for fast acceleration. For next bus to catch fire, I think it should be Voith geared. When I pass by Volgren bendys on 962, I can sometimes hear the engine revving up to high rpms.
Habits and Volgren bendys use a turbocharged, intercooled engine which is supposed to help the engine produce more power at the same temp. But me thinks that the intercoolers on these buses could be damaged or non-functionable.
Im not sure if this info were correct anot .
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I didnt notice that . But i only noticed that the Habits that caught fire were the first batch ZF Habits , which were only equipped with a turbocharger WITH NO intercooler* .Originally posted by TIB1049L:And do you notice that the buses burnt were actually ZF? Seems like Habit bodies aren't suitable for ZFs
If ZF bendies were the main cause , then the 2nd batch , which were equipped with an additional intercooler * should also have caught fire as well .
The engine with NO intercooling , OM447hA produces only 900Nm of torque max while the engine with intercooling , OM447hLA produces 1100Nm torque max* . So maybe the first batch ZF Habits that werent equipped with intercooler their engine might have to work harder .
*Info was given to me by someone awhile back . -
Bus fires normally are due to the following:
(1) brake seizure- Volvo running on Z cam systems are extremely prone to jamming.
(2) Turbo Chargers- The turbocharger is jammed or lack of lubrication from the EO directly tapped from the oil filter.
(3) Electrical faults- Common in all sorts of vehicles.
(4) fuel leakage- Petrol engines will be very prone to fire if fuel lines leak. But diesel merely causes smoke with the current bus operations. To burst into fire with diesel is not easy.
(5) ATF leakage- ATF is combustible even though the temperature required to burn it is very very high and almost unlikely in normal conditions. The Exxonmobil ATF requires up to 200DegC to burn as demonstrated by SBS Technical Service Team before. But as ATF is a very commonly circulated fluid in the buses, for it to leak onto hot surfaces and cause smoke mistaking it to be fire is common.
I am not saying that there will not be other possibilities but they are really too low. (1) to (3) are the most common. (4) and (5) are not common. In fact I have yet to hear about diesel and ATF causing fire on buses.
Intercoolers have nothing to do with fire or not normally. There are basically 2 intercoolers in the buses. One is the turbo intercooler which helps to cool down the force fed air into the combustion chambers as turbo induced force fed air also carry the hot air into the combustion chamber. The high air temperature does not execute combustion as effective. The hot air is circulated around the coolant in 2 different passages. Therefore transfering the heat to the coolant which in turns dissipates it at the radiator.
The other intercooler is the gearbox intercooler whereby the ATF that is used to operate the gearbox requires to be cooled constantly. Therefore an intercooler allows the ATF to circulate around the coolant in 2 different passages. So that the heat can be transferred to the coolant which will dissipate off at the radiator. -
in such cases, will there be any red warning lights on the dashboard? and are the drivers disciplined for can't be bothered attitude?Originally posted by carbikebus:........Investigation shows that the bus didn't have the minimum water level required at the radiator and coolant box.Cases of lazy SL
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That day, when 9214S overheat, BC say the temperature gauge was in the red zone and got warning light at the panel there. He also say the accelerator cannot press anymore.Originally posted by SBS3688Y:in such cases, will there be any red warning lights on the dashboard? and are the drivers disciplined for can't be bothered attitude?
Maybe SMRT, safety functions all never maintain properly so never work, like their speed limiters...
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Sekali on the dashboard we got see a smallhole . Then we realize it use to house the red indicator .Originally posted by stooper:Maybe SMRT, safety functions all never maintain properly so never work, like their speed limiters... -
That burn bus actually has a number of overheating records as told by a senior tech @ AMDEP
SMRT Buses record of prone to overheating buses
>Dennis Lance UMW
Braking problems
>Hino HS3KRKA
Coolant hoses always wear off easily
>Scania L113CRL
Brake fluid problems/Coolant problem
>DAF SB220
The most less problematic and easy to maintance
>MB O405/O405G -
DAF buses often have the "Maintenance" warning light lighted up on the driver panel.Originally posted by Scania N113CRB luver:Sekali on the dashboard we got see a smallhole . Then we realize it use to house the red indicator . 
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There is a fire warning light on the Habit dashboard panel, hmm, it should be there somewhere cannot describe clearly...
And TIB1118X will be laid up till 23 May 2008, according to the LTA site, all the best! -
I don't believe SMRT had never took the effort to repair the speedometers as a couple of Nissan U31RCNs have jammed speedometers and thier warning lights removed! What the#$%@&*
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If its jammed at 120km/h I don;t mind, if its jammed at 0km/h, wow, I better get off first...Originally posted by tintinspartan:I don't believe SMRT had never took the effort to repair the speedometers as a couple of Nissan U31RCNs have jammed speedometers and thier warning lights removed! What the#$%@&* -
They do not have EZ link Readers. (Unless they have them Installed and that cost $$$ too)Originally posted by sBs_boy:Er.. based on the number of routes they now have, i dont think SBST can afford to lease their buses as well.. Unless SMRT dont mind some private companies like Chitson Transport, Woodlands Transport, Bedok Transport, AZ Bus, Tong Tar Transport, Comfort Bus etc etc etc.. -
Placement has nothing to do with it. I would say that it is the result of high revving at low speeds (ie 60km/h). An O.405G went up in flames for Travel West Midlands in the UK a few years ago.Originally posted by Scania N113CRB luver:possible also . Another problem is the hot running turbocharged engine . The horizontal placement of the engine meant more space is permitted in the passenger compartment , however , the engine is placed inside a tight area , .I found this info from a website , but im not sure whether its true or not . Pardon me if that is not true .
Another reason for bendy buses overheating and catching fire is the tendency "for articulated buses to use the same engine as non-articulated buses; this leads to a slower speed and acceleration, due to an increase of weight. When used in cities with many slopes (e.g. Vancouver, B.C. or San Francisco, California) the vehicle is prone to overheating, leading to stalling in the milder case and a fully fledged fire in the worst case. ", according to wikipedia.
While the same engine is used in an artic, the engine itself has higher power and torque than the standard non-turbo or low-boost turbo engine variants in the rigid O.405. I really wish you would stop posting misleading information.