10 more B10BLE-CNG commissioned for SBS Transit
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hey... do you know...Originally posted by MS:Maybe you might want to consider taking engineering when you go to university and try to apply and join Comfortdelgro/SBST as an engineering personnel.
my plan is to study mechanical engineering in university and work with one of the transport giants.
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U r always welcomed to apply after your graduation. Look out for any vacancies in www.sbstransit.com.sg/careers Or can try out comfortdelgro.Originally posted by sinicker:hey... do you know...
my plan is to study mechanical engineering in university and work with one of the transport giants. -
me in the army, automotive tech. but not planning to venture into this line.
we're all just bus fans, interested in buses and stuff. anyway it seems like only 2 out of the 10 CNG buses are out today. the rest are still being prepared? how long ago did it started? i know 4 of the the buses originally parked at Bt Batok Depot were sent back to Soon Lee sometime in Oct/Nov. -
hahaha.. thanks.. i'll study hard.Originally posted by MS:U r always welcomed to apply after your graduation. Look out for any vacancies in www.sbstransit.com.sg/careers Or can try out comfortdelgro. -
Hi MS, members from this (and some not from this) forum comes from all walks of life. Some are students, some are National Servicemen, some are professionals. Just that we all share the same passion as bus enthusiasts. Glad that you and your guys are so appreciative of our support! We are also honoured that we have a professional from SBST as a guest in the forum! Hope you can be part of our family of bus enthusiasts!Originally posted by MS:Hi! Just stumbled into this bus forums and didn't realised that our CNG buses will be such a hit among all here. These CNG buses are out on the roads today. Although there were many technical hiccups after we take out the buses after so long of storage, we managed to solve them and push the buses onto the road. I had a session with Volvo on Friday evening and came to understand how the CNG bus works in the aspects of fuel carburetion. The rest of the bus is the same as a normal diesel bus. Like the MK4, The CNG bus has a 'boxer' styled engine. This bus is indeed a safe vehicle to travel with. Even safer than the normal diesel buses. (Our diesel buses are already maintained in the best condition as much as our budget can allow. Already so safe, imagine our CNG buses. No matter what Safety is No:1, no efforts and costs will be spared to give the public the best experience in travelling with SBST in terms of any aspect.) And most impt its new! Never put on the road for driving though stored for quite long.
Thanks for all the support! This gives me more encouragement to give the best technical services to the buses for the greater good of the public.
Once again Thank You!
By the way, are you all also from this industry? -
Yeah man.. I was under HQ MES also. This company is the best choice for ORD personnel with experience and skills. The workshop frontline status changes frequently. So more could be out by afternoon or maybe tomorrow. I need to get back to office before I'm updated. All the CNG now belongs to Soon Lee. Since you're in this line, you should know if vehicles parked for long periods and not using, the rubber seals, belts etc will be damaged. So we need to replace them to ensure only the best parts goes on the roads. On top of that we also have other buses to take care of. So its really a tight race against time.Originally posted by ^tamago^:me in the army, automotive tech. but not planning to venture into this line.
we're all just bus fans, interested in buses and stuff. anyway it seems like only 2 out of the 10 CNG buses are out today. the rest are still being prepared? how long ago did it started? i know 4 of the the buses originally parked at Bt Batok Depot were sent back to Soon Lee sometime in Oct/Nov. -
whoa. civilian or military maintenance, what's the difference? which is harder?Originally posted by MS:Yeah man.. I was under HQ MES also. This company is the best choice for ORD personnel with experience and skills. The workshop frontline status changes frequently. So more could be out by afternoon or maybe tomorrow. I need to get back to office before I'm updated. All the CNG now belongs to Soon Lee. Since you're in this line, you should know if vehicles parked for long periods and not using, the rubber seals, belts etc will be damaged. So we need to replace them to ensure only the best parts goes on the roads. On top of that we also have other buses to take care of. So its really a tight race against time.
is there a need for an engine run-in period since they were prepared for long term laying up with preservative chemicals?
we did see that the nuts securing the seat handles to the seats were rusty, but to take them out would require change the whole handle. -
Military and civilian got difference... At least you don't get charged or sign extra duties for longer than 'standard' hair. But in civilian, your results mean everything. In military some carry balls will mean easier promotion. But in civilian, its the survival of the fittest. Thats why I feel that in SBS, the challenges are there. Much more than I was in SAF. Because every decision that I make will affect the end users which are the passengers. So I must at all cost place the safety and comfort of my passengers and BC as top priority. Not forgetting also to give my workshop staff a safe environment to provide the best results to present to all the passengers.Originally posted by ^tamago^:whoa. civilian or military maintenance, what's the difference? which is harder?
is there a need for an engine run-in period since they were prepared for long term laying up with preservative chemicals?
we did see that the nuts securing the seat handles to the seats were rusty, but to take them out would require change the whole handle.
We do run in the engines. If we do not run in, then our engines won't last. This is applicable to all engines regardless its a car or bus or motorcycle. Engines are very costly. I'm not sure whether there're any preservative chemicals as when I joined SBST, the buses were already in storage. But the CNG buses do not have fuel tanks for preservative chemicals like the Vappro anti-Corrosion Inhibitors which SAF is using. The fuel tanks are replaced by 8 gas tanks on the roof of the bus. These gas are ignited by spark plugs. So the engine is somewhat similar to a petrol engine. The CNG bus engine is 'boxer'styled like a BMW motorcycle as the engine is mounted lying down. (pistons move horizontally.) But it's also technically correct to say its an inline 6 cylinder turbo charged petrol/CNG engine. If pple were to say CNG buses are not safe as these gas will detonate if leak, it is not true. For the CNG to detonate, we need to have 10%-15% CNG and the rest normal atmospheric air, plus a condition of minimum 680 degress celcius, plus a mode of ignition (spark). Only 1 place in this world are we able to achieve such a condition. That is inside the combustion chamber of the engine where temperatures can hit as high as 2000 degree C. There is no way anyone other than God can create such a condition in the normal atmosphere. If there is indeed a leakage, then all that it will cause is a reduced mileage. But such problems will be tackled when the bus returns to the depot for PM servicing frequently. All workshop staffs will do our best to ensure only the best goes to the route groups which in turn are presented to passengers by our BC.
I'm monitoring the performance and camouflaged problems of the CNG buses while its on the road. And will keep tabs on all technical problems that might create any possibilities to cause discomfort or danger. I'd rather react to a false alarm rather than to let go any possible risk to any of my passenger's safety or comfort.
Thanks a lot. -
I used to from HQ Eng Dept. Is the business fn of MES the same as Eng Dept? We might had interact with one another beforeOriginally posted by MS:Yeah man.. I was under HQ MES also. This company is the best choice for ORD personnel with experience and skills. The workshop frontline status changes frequently. So more could be out by afternoon or maybe tomorrow. I need to get back to office before I'm updated. All the CNG now belongs to Soon Lee. Since you're in this line, you should know if vehicles parked for long periods and not using, the rubber seals, belts etc will be damaged. So we need to replace them to ensure only the best parts goes on the roads. On top of that we also have other buses to take care of. So its really a tight race against time. -
great news... so as of today, how many have beeon out?
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I saw 1 in the morning along Telok Blangah Road...did not see the bus service no though...maybe svc97...need confirmation on this...Originally posted by SBS9828X:great news... so as of today, how many have beeon out? -
sv143. I saw it at Jurong East Int. I also saw 1 on sv66 (SBS2991C), 3 on sv105 (SBS2989K, SBS2994U, didn't catch the rego of the 3rd one and its not SBS2988M), 1 on sv243G.Originally posted by bendy2003:I saw 1 in the morning along Telok Blangah Road...did not see the bus service no though...maybe svc97...need confirmation on this... -
Originally posted by samtlk:
The third B10BLE CNG on service 105 should be SBS 2992.
sv143. I saw it at Jurong East Int. I also saw 1 on sv66 (SBS2991C), 3 on sv105 (SBS2989K, SBS2994U, didn't catch the rego of the 3rd one and its [b]not SBS2988M), 1 on sv243G.[/b]
Saw it this afternoon at Jurong East Interchange at 3pm plus, one of the service captain was demostrating to another service captain the various function of the bus.
Was amazed to see the bus kneeling down and rising back up. Does the original 2 B10BLE CNG also have this kneeling function? -
Originally posted by samtlk:
2 are down. One due to leaking steering pump and the other due to damaged magnetic clutch for the air con system. But we're doing our best to rectify the faults. Its no secret that if the buses have been kept for long periods of times w/o usage, all the rubber will harden and crack or brake. This is the reason why I'm facing with these problems. I've have to hold back these two buses especially 2996 with the damaged magnetic clutch as I want to eliminate all the possible complications rather than to merely just replace the clutch in order to ensure only the best goes on the roads for you all to enjoy.
sv143. I saw it at Jurong East Int. I also saw 1 on sv66 (SBS2991C), 3 on sv105 (SBS2989K, SBS2994U, didn't catch the rego of the 3rd one and its [b]not SBS2988M), 1 on sv243G.[/b]
Thanks for all your support for the CNG buses. I'm really touched by all these support. These faults proved little to the giantic support you all have given to our Soon Lee CNG buses. -
Probably 143.Originally posted by bendy2003:I saw 1 in the morning along Telok Blangah Road...did not see the bus service no though...maybe svc97...need confirmation on this... -
Thanks a million MS.Originally posted by MS:2 are down. One due to leaking steering pump and the other due to damaged magnetic clutch for the air con system. But we're doing our best to rectify the faults. Its no secret that if the buses have been kept for long periods of times w/o usage, all the rubber will harden and crack or brake. This is the reason why I'm facing with these problems. I've have to hold back these two buses especially 2996 with the damaged magnetic clutch as I want to eliminate all the possible complications rather than to merely just replace the clutch in order to ensure only the best goes on the roads for you all to enjoy.
Thanks for all your support for the CNG buses. I'm really touched by all these support. These faults proved little to the giantic support you all have given to our Soon Lee CNG buses. -
anyway, a clanking sound was heard on SBS2996P when the engine is being revved above 1800/min, sounds like a certain metal piece is knocking against the shaft. maybe u can check that out.Originally posted by MS:2 are down. One due to leaking steering pump and the other due to damaged magnetic clutch for the air con system. But we're doing our best to rectify the faults. Its no secret that if the buses have been kept for long periods of times w/o usage, all the rubber will harden and crack or brake. This is the reason why I'm facing with these problems. I've have to hold back these two buses especially 2996 with the damaged magnetic clutch as I want to eliminate all the possible complications rather than to merely just replace the clutch in order to ensure only the best goes on the roads for you all to enjoy.
Thanks for all your support for the CNG buses. I'm really touched by all these support. These faults proved little to the giantic support you all have given to our Soon Lee CNG buses.
talking about the rubber, i hope you didn't have to change all the bushings? is the B10BLE easier to maintain compared to other models in Soon Lee? -
Once the magnetic clutch is up, air con working fine, I will personally go and hunt for that noise. Your concerns also corresponds with one of my PM I received. Rest assured. This feedback was also one of the reasons why the bus has to be hospitalised.Originally posted by ^tamago^:anyway, a clanking sound was heard on SBS2996P when the engine is being revved above 1800/min, sounds like a certain metal piece is knocking against the shaft. maybe u can check that out.
talking about the rubber, i hope you didn't have to change all the bushings? is the B10BLE easier to maintain compared to other models in Soon Lee?
As much as possible, I have to ensure that all the rubber parts are in good condition. I dunwan anyone to take my bus and end up air con not cold or not working. All your comfort and safety is on the top priority of my list regardless its a serious transport ride or joy ride.
Actually the CNG buses are harder to maintain. Plus we're not used to these designs. The Volvo Rep came down to assist my guys today. But we'll get used to it. No matter how hard it is to maintain these buses, so long my passengers enjoy the the ride, will be enough to fuel our fighiting spirits to continue to give everyone the best services possible. -
243 CNG is 2998J
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Originally posted by MS:Once the magnetic clutch is up, air con working fine, I will personally go and hunt for that noise. Your concerns also corresponds with one of my PM I received. Rest assured. This feedback was also one of the reasons why the bus has to be hospitalised.
As much as possible, I have to ensure that all the rubber parts are in good condition. I dunwan anyone to take my bus and end up air con not cold or not working. All your comfort and safety is on the top priority of my list regardless its a serious transport ride or joy ride.
Actually the CNG buses are harder to maintain. Plus we're not used to these designs. The Volvo Rep came down to assist my guys today. But we'll get used to it. No matter how hard it is to maintain these buses, so long my passengers enjoy the the ride, will be enough to fuel our fighiting spirits to continue to give everyone the best services possible.
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Finally a new type of bus is added to Boon Lay IntOriginally posted by stooper:243 CNG is 2998J -
MS, you seem to have some pretty good knowledge about the Volvo B10BLEs. What can you tell us about the fuel system of the Volvo GH10B engine? In particular, where abouts in the intake manifold are the injection valves located in relation to the butterfly valve?
For comparison, the Mercedes-Benz M 447 hLAG engine (Citaro and OC 500 LE) has 12 Bosch gas injectors mounted on a metering block that injects fuel into a mixer located just above the butterfly valve. Injection quantities are closely monitored by the universal exhaust gas oxygen sensor, ensuring that variations in fuel quality are compensated for, right down to a minimum methane number of 68, and that the air/fuel mixture can be maintained close to a target setting, usually around Lambda=1.55, for the lowest possible emissions.
Things that I do know about the GH10B engine are:
1. it was replaced by the Volvo GH10C Euro 4 engine, which has now replaced by the current model Volvo G9A Euro 5 engine.
2. it is a LEAN-BURN engine, running on a weak mixture of air and fuel.
3. it is an OPEN-LOOP engine, meaning that the engine control unit has no provision for exhaust gas oxygen sensor feedback - critical for compensating for varying fuel quality as well as manufacturing tolerances and the usual wear and tear. The mechanics thus have the job of making sure that the engines are set correctly to match local fuel quality.
Regards,
Dave -
Regarding your question, I will need to explain via email or fax. Can send to my personal email at [email protected]Originally posted by PoweredByCNG:MS, you seem to have some pretty good knowledge about the Volvo B10BLEs. What can you tell us about the fuel system of the Volvo GH10B engine? In particular, where abouts in the intake manifold are the injection valves located in relation to the butterfly valve?
For comparison, the Mercedes-Benz M 447 hLAG engine (Citaro and OC 500 LE) has 12 Bosch gas injectors mounted on a metering block that injects fuel into a mixer located just above the butterfly valve. Injection quantities are closely monitored by the universal exhaust gas oxygen sensor, ensuring that variations in fuel quality are compensated for, right down to a minimum methane number of 68, and that the air/fuel mixture can be maintained close to a target setting, usually around Lambda=1.55, for the lowest possible emissions.
Things that I do know about the GH10B engine are:
1. it was replaced by the Volvo GH10C Euro 4 engine, which has now replaced by the current model Volvo G9A Euro 5 engine.
2. it is a LEAN-BURN engine, running on a weak mixture of air and fuel.
3. it is an OPEN-LOOP engine, meaning that the engine control unit has no provision for exhaust gas oxygen sensor feedback - critical for compensating for varying fuel quality as well as manufacturing tolerances and the usual wear and tear. The mechanics thus have the job of making sure that the engines are set correctly to match local fuel quality.
Regards,
Dave
Thankx -
1800/min? isn that the revs wen the pedal isnt stepped on?Originally posted by ^tamago^:anyway, a clanking sound was heard on SBS2996P when the engine is being revved above 1800/min, sounds like a certain metal piece is knocking against the shaft. maybe u can check that out.
talking about the rubber, i hope you didn't have to change all the bushings? is the B10BLE easier to maintain compared to other models in Soon Lee? -
1.8krpm is too high for a bus to remain stationary. The idling should be at the 1.2krpm region. This is the stall test RPM. The bus should be able to hit 1.2krpm region during stall test in order to be deemed as with power. This is for the 2 axle Volvo Olympian. For exact details, I need to check with the Leading Hands because different vehicles may differ. A 1 litre sportsbike may be just half clutch at 1.8krpm but 1.8krpm for a bus will be too powerful to remain stationery.Originally posted by SBS9828X:1800/min? isn that the revs wen the pedal isnt stepped on?
Anyway when I told my colleague that the public is very concerned with our CNG and positively reacting, he was smiling very happily. My guys are touched to know that the public actually appreciates our hard work. Every organisation has their problems. Even SBS is not spared this fact. So it is not easy to maintain the fleet. The success of the buses daily that goes on the road everyday, is the credit of the entire workshop. When the bus returns as breakdowns, our heart sinks with the vehicle. My guys hold pride in the way they work and I'm really proud to say that I am a member of this organisation.