Why sbs dont buy leyland buses anymore?

stooper SG

So all the present engines are not the original engines? Are they replaced by engines of the same model or have they been changed?

And I notice especially that the lower deck seats of some Leylands emit excessive heat (i.e. 9092B, 9058B, etc) when coasting or braking. Is this something to do with the engines also?

sBs_boy SG

As Of now, there is only 1 left..

MS SG

Of course not.

Engines are replaced off and on. Maybe in a whole life of a bus, there could be 4 engines replacements. In a bid to reduce costs, we overhaul our own engines. Some done by own depot some done by CDGE. But I insist on letting CDGE do it because we pay for a neat sum of >$15K for a Volvo B10M engine that covers a total overhaul package and running in. Also 1 year warranty. Engine overhaul is the easiest to me amongst the 4 major components Engine, axle, gearboxes and diff unit. But still it is something that only professionals in this line with proper specs can do. After overhauling, we need to run in the engine. In my case, the engines are run in by CDGE to achieve optimum results. I cannot possibly get the BC to run in for me.

I have read about hard run in when I visited other forums like the local bike forums but what I can say is that those are crap. You ask any professional in this line who's not any dida-apa 'professional' from some forum rubbish will always tell you to run in according to the manufacturer's recommendations. Specific technical details will go into long story. So whoever interested can PM me for details or meet up sessions.

You are sitting next to the engine if you take the last row of the lower deck's seat. When moving, more heat is emitted because the engine works and stronger combustion will bring about more heat. But when stopped, the hot air gets staled though lesser heat generated, you still feel almost the same amount of heat. Either ways there's always heat. But I assure that there's no harm sitting on the five seater though it's nearest to the engine. If you dun like the idea of being next to the engine, you can choose the upper deck front seats. Furtherest away from all heat sources.

iveco SG

Scanias long lasting? Get more Scanias. Bring on the K95s. Mr. Green

Scania N113CRB luver SG

But i heard that Scanias are more expensive than Mercedes, is that true?

stooper SG

I dunno what you're talking about in the hard run paragraph... Confused

Yeah, I meant the 5 seater at the back. But I don't mean when the bus is stopped. I mean when the bus is braking. If you put your hand over the gaps between each seat when the bus brakes (especially 9092B), you will feel the hot air blowing out! Shocked
I haven't experienced it yet on Volvo DDs.

carbikebus SG

Since Scania can lasy long why don't CD try out some Scania K230UB Single decks?Volvo B9L single decks is another option Mr. Green

The_Bus_Guide SG

Yah. I been waiting so many years for SBST to buy new Scania or Mercedes buses. But everytime new bus, must be Volvo one. Very sian.

XTransbus SG

should be.
anyway scania chassis tend to vibrate more over time. You can notice it on the n113.

MS SG

Running in aka breaking in is essential for a new engine as the engine parts are still very new and un-mated to each other's surface. So need to use it within a certain amt of RPM to prevent seizures or poor mating. I read some crap on hard-run in in some other websites and motorbike forums. Those are crap idiots who invent their own way of running in rather than use the manufacturer's recommendations who have the correct material knowledge, calculations of tightness/tolerances and carried out trials with prototype engines before. Detailed engineering aspects will take a lot of pages. I wuldn't mind explaining in person or PM.

When braking the vehicle suddenly reduces speed, the heat near the engine compartment while still at high velocity travelling caused by the previous top speed of the vehicle will rush forward causing turbulance at crevices, holes, openings. Therefore you will feel heat rushing out at that time. But when slowed down sufficiently, the rushing heat will reduce.

carbikebus SG

There’s a certain limit of speed during running-in of new or just overhaul engines,Be it Motorcycles,Cars,Buses or Trucks

MS SG

yes precisely. This running RPM during the run in in period should be observed in order to prevent damage to the engine parts. Never ever believe anyone who says hard run in is good or he has some dyno testing run in which he design himself. Do not even trust that person even when he says his self design hard run in method can give more power. Those who're well versed in engine constructions will never dare to say that. I have seen quite a few 'engine-nears' claimed they have some great way of running in engines and swear by it. And kept arguing and flaming over these matters. I only have one word to say - foolish empty vessels.

The tolerance of the combustion chamber/piston rings, how many piston rings, piston size, gundgeon pin, bearing for crankshaft to con rod etc etc all has a tolerance. The oil pump pressure, cooling capacity all affects the engine future performance after running in. Only with a proper manufacturer who has the correct values, correct trial test results can be qualified to give the recommendations. Even in CDGE, the engines are run in according to the proper specifications before giving to SBST for consumption. Also during running in periods, since the amount of 3 body wear metal is more than usual, oil change will be much faster.

I have previously consulted Dr Teo Swee Hin (NUS) regarding material engineering on a ZF PTO project. He explained that the worst form of wear is caused by 3 body wear. That is why oil filter and oil must be changed regularly. All automotive technical personnel knows that oil and oil filter must be changed periodically else it will cause unwanted wear in the engine. But few knows about this 3 body wear matter.

I am now administering the overhaul of MB0405 air compressors which tap the rotary powers from the MB0405 engine directly. Air compressors also need to run in actually. But since the overhauled compressors only replaces piston rings (2 air 1 oil), running in is not so critical. At the same time, if it is new compressor fixed to a new engine, since the rotary power is tapped from the engine, running in the engine = running the air compressors also. Since they run on the same RPM.

iveco SG

You can console yourself that SMRT has many nice Mercs (Rigid & artic version) in their fleet. Laughing

MingFreeman SG

Ya.......sbs seems to be in love with volvo. Confused

iveco SG

while tibs enjoys close ties with merc. Neutral

Scania N113CRB luver SG

U forgot the L113CRL, the worst rattler! Shocked

105090 SG

ComfortDelgro is the sole/main agent for dealing in Volvo buses in Singapore, hence, this makes sense that it uses mainly Volvo buses..

not forgetting that when u buy the same brand, its easier and cheaper to maintain

SBS9828X SG

issit in any way possible to introduce variable geometry turbos? definitely no lags in those leylands

carbikebus SG

We're talking about zero step buses actually,Those at SMRT still a low steps citybuses,Inlike SBST which have B10BLE CNG & Diesel,Scania L94,VSO,Tridents,B9TL.But my instinct says that we will see a few units of Scanias and probably Mercedes-Benz & Daewoo buses in future by SBST

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