bus gauges

xunmengzitu SG

how many gauges does a bus have? other than speedometer….

ZYX2005 SG

this one i dunno.

i know of speedometer (speedo)

tachometer
this one measures how far a bus traveled since it was made. poor thing tends to reset many times as bus run n run. some bus companies take note of start n end tacho nnumbers to determine if the bus run a lot or little and then use the info to improve bus running time efficiency.

suspension air/fluid pressure meter
this one is quite famous in our volvo B10M buses , when driver start shift he has to rev the bus engine to charge up the air / fluid in the bus suspension to a certain amount before he is allowed to moe off.

when charging u see the arrow jump from 0 to a sigle digit number say 3 then back to 0, the meter will continue the bouncing fashion until it stick to a required number then the bus can move off. that is why sometime u see driver rev n rev the bus cuz the poor bus air suspension gone down below the required value.

somehow i have never quite figured out why when u leave the bus stationary, the air just run out of the suspension system. hahah

air suspension is bus is to provide us a comfortable bus ride because the air in the suspension will cushion the road bumps as bus roll n roll over them. some suspension system use fluid form eg some liquid.

fuel meter
this one any vehicle got larh

digital gas fuel meter counter
this one only gassy got.

ZYX

Scania N113CRB luver SG

Take a bicycle tire for example . If you leave the bicycle tire untouched over a period of time , the tire will lose its pressure , and hence deflates. The valve infact , is not completely airtight .

The bus's brake system works the same way . One of the reason why air brakes have spring loaded brakes too , is because air can escape over time . If all the air escapes , the brakes would fail completely , causing the vehicle to runaway.

I presume the bus's leveling suspension works the same way too , because all these systems uses valves . Valves , aren't completely airtight at all . Air can escape thru the valves over time .

Thats from what i know . Please correct me if im wrong . Smile

ZYX2005 SG

tink u more or less right.

oh yah the air also work the brakes besides just he suspension . good point u pointed out . so must pump up by reving engine so as to ensure safe braking while driving bus

ZYX

Ferrari_RoXz SG

I think the description of the tachometer is wrong. Instead, i think you are refering to the odometer. A tachometer shows the engine's speed / Revolutions Per Minute (RPM). It varies between gasoline vehicles and diesel vehicles. Gasoline driven vehicles have higher RPM compared to a diesel one.

MyPillowTalks SG

the clock is in the middle of the speedometer
oil pressure
rev
brake pressure (bus uses exhuast brake, so when stop u will hear the sound, exhuast brake uses airpressure the stop the vehicle, so the pressure helps to ensure the brake is not locking up so much)
water temp?

TIB1224Y SG

Yeah, from what I saw before was the air pressure gauge (it was explained on a SMRT Box Bendy, the needle pointing at 8 bars would mean optimum air pressure; the needle was at 7 bar then), and the tachometer, seeing it go up and the louder engine sounds along the way pumps adrenaline...
Oh yeah, on the air pressure gauge, there is also a needle indicating brake pressure, when the foot brake is depressed, the needle will react and 'drop' bit (from obeservation its the 'increase of brake pressure', but from a Merc gauge it looks like dropping).
There should be also a turbo gauge, but I am not sure of its existence.

Scania N113CRB luver SG

Thats because diesel engines have longer strokes than petrol engines . An engine with a long stroke has reduced RPM , but increased torque . Thats why diesel engine tend to have lesser HP , but much higher torque than petrol engines.

MyPillowTalks SG

does all bus have turbo? older bus have or not ar? Confused

Scania N113CRB luver SG

No . The Mercedes Benz O405 (SBST) does not have turbo . As for older buses, im not too sure . But i know that the Mercedes Benz O305 does not have turbo too.

Mercedes Benz O405 :

OM447h

Mercedes Benz O305 :

OM407h

If the engines are turbo charged , it would be OM447hA or OM407hA . If intercooled, its OM447hLA or OM407hLA .

h Denotes pistons are placed horizontal

A Turbo installed.

L Intercooler installed .

For OM447h , it means Horizontal , Normally Aspirated (no turbo)

For OM447hA, it means Horizontal pistons , TurboCharged.

For OM447hLA , it means Horizontal , Intercooled , Turbocharged.

Freedom Fighter SG

does SBS buses have gauges/speedometers to find out how fast a rhk is?

SBS9818A SG

uncle... tachometer measures the revolutions per minute of the cylinders in the engine.. while ODOmeter measures the total distance travelled..

tintinspartan SG

Talking About Odometres, how many miles can a bus travel from date of registering to it’s Deathday (throughout a lifetime of a bus). I saw buses clocking up almost 1 000 000 km especially the UDs and the pre-1995 buses

TIB1224Y SG

I have seen TIB869T clock 999958km, but I missed the part when it became 1000000km though...
Should have chance that buses hit more than one million km in their lifetime, depending on usage loh...

kenn3th SG

demo buses like 9888y i think will hit less than 1000000km