KUB Vs OC500
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ZF gearboxes tend to constantly whine on OC 500s, even in Perth.
Regards,
Dave -
Originally posted by Oceane:
Took 2 OC500 rides this week and realised that both buses (SMB 30Z & SMB 9L respectively) have a sharp whirring sound from the engine whenever the bus is in motion, which previously could not be heard. As for the former, it is really loud and sharp and can even be heard from the outside while for the latter it is not as noticeable but I definitely could make out the same whirring sound from the engine while bus is in motion.Any explanations for that?
On another note, SBS 8310D (K230) zoomed past me the other day and the engine sounded as if it was a tractor motor! There was a loud grong-grong sound from the engine and I nearly thought the engine had overheated or something. And similarly, cannot be heard previously (I took the same bus twice before which did not have this problem then). Is it due to some parts in the engine malfunctioning / going loose which caused this problem?
That 'grong-grong' sound seems to come from the radiator side for the K230. Some of those K230 or even the OC vehicles have loud radiator noises even when they are not moving...
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Originally posted by Powered_By_CNG:
ZF gearboxes tend to constantly whine on OC 500s, even in Perth.
Regards,
Dave
is this due to hypoids?
I have this impression that the ZFXHPXX4th series do not whine unless the NBS engages..ZYX
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OC exhuast brakes
Ah an irritating thing of the new generation buses, the exuahst braking.
On the KUB it sounds like someones choking in the engine with loud wialing engine fans following suit.
On the B9TL, its irritating like the bus is going into a spasm...
On the OC, its less noticable. But yet if you notice it, its less ungraceful like the other models i mentioned above. Sometimes its quite muffled. I guess the OC sound inuslation actually works for the bus in gemilang.overall - i dun dig the new generation exertive and chokish exhuast braking method...lol
(and yes i am aware exhuast braking is in some older buses as well, but they dun give you the choked sensation) -
Originally posted by ZYX2005:
On the OC, its less noticable. But yet if you notice it, its less ungraceful like the other models i mentioned above. Sometimes its quite muffled. I guess the OC sound inuslation actually works for the bus in gemilang.Just to clarify - Only SMRT insulate the engine sound or does Gemilang provide the option of insulation to all Gemilang bodyworked buses? TIBS had a great tradition of insulating the engine noise.
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Yes for a ex-TIBS/SMRT Mercedes Benz O405 as an example, I believe that when the bus was assembled, the insulation is already there to block out majority of the noise, and it had not been modified since. The insulation is no doubt good; when the engine goes into kick-down sequence or roaring at high RPM, often there would only be a slight increase in cabin noise. The tone changes, the noise does not rise drastically.
On to the OC500LE, i believe that when the bus is assembled, the insulation is already there, ie. SMRT did not add extra insulation, and to think about it, it would be tedious to add insulation and perhaps de-constructing part of the bus to do that! So it would be on the manufaturer's side, either it came as standard, or as customisation which the latter would not likely be of economical range, or rather, practical range...
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Originally posted by ZYX2005:
is this due to hypoids?
I have this impression that the ZFXHPXX4th series do not whine unless the NBS engages..ZYX
The OC 500 LEs don't have Ecomat 4s...
Regards,Dave
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Originally posted by ZYX2005:
OC exhuast brakes
Ah an irritating thing of the new generation buses, the exuahst braking.
On the KUB it sounds like someones choking in the engine with loud wialing engine fans following suit.
Exhaust brakes work by blocking part of the exhaust flow, so of course there will be a choking effect. That's what slows your engine down!!
Regards,Dave
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I feel like OCs r the attention grabbers for pedestrians sometimes.. Their eyes just cant get off them even me!
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Originally posted by Powered_By_CNG:
Exhaust brakes work by blocking part of the exhaust flow, so of course there will be a choking effect. That's what slows your engine down!!
Regards,Dave
oh, in that case what i mena is
There is too much choke in these exhuast braking things of today newer buses compared to exhuast brakes used for older bus models......
lol
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Originally posted by Powered_By_CNG:
The OC 500 LEs don't have Ecomat 4s...
Regards,Dave
oh dear Dave,Bit of confusion here.
In terms of ZF gearbox models, those ending with 4 are for EURO V buses right?
eg: Zf6HP604CN is a for an EURO IV or V bus.
thats what i meant, these newer models of gearboxes for more stringent EURO IV and V buses. Since the OC500LE is an EURO V bus it would be using a ZFXHPXX4 model.
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Er.. i dunno know what Ecomat 4 means... It sounds like some extra feature in the Zf4HPXX4 gearboxes types...which i gather from your reply OC500LEs dunt have..whatever it is...
A very confused
ZYX
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Originally posted by SMRT BUSES LuvER:
I feel like OCs r the attention grabbers for pedestrians sometimes.. Their eyes just cant get off them even me!
They'll probably grab more attention if they had a "full capapcity" front. I jjust love imagining the V shaped glass front with the Mercedes 3 point star in its plith hanging in front like an award medal to the bus.hey this is your award, you are a Mercedes. (congrats - hangs medal on bus)
it shows how much pride Mercedes have in their buses and in general how prestigiuos Mercedes products are. You think Mercedes Cars are prestiguos? The OC500LE is more prestigous than the Mercedes car...lol
And indeed the bus does live up to its name provided us (well mostly me) good rides since 2008...
Always proud to baord a Mercedes OC500LE i would say...
ZYX
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Originally posted by Powered_By_CNG:
ZF gearboxes tend to constantly whine on OC 500s, even in Perth.
Regards,
Dave
I have taken to a listening of Perth OC500LEs... they do whine a lot. Compared to ours, they whine plenty.oddly ours shows more of a L113CRL charcter to the engine sound and less whining background sounds.
Cheers
Yanxin -
Originally posted by ZYX2005:
oh, in that case what i mena is
There is too much choke in these exhuast braking things of today newer buses compared to exhuast brakes used for older bus models......
I think you may be confusing the exhaust brake with the transmission-integral hydraulic retarder. Transmissions have definitely gotten harsher since Euro 3.
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Originally posted by ZYX2005:
In terms of ZF gearbox models, those ending with 4 are for EURO V buses right?
eg: Zf6HP604CN is a for an EURO IV or V bus.
thats what i meant, these newer models of gearboxes for more stringent EURO IV and V buses. Since the OC500LE is an EURO V bus it would be using a ZFXHPXX4 model.
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Er.. i dunno know what Ecomat 4 means... It sounds like some extra feature in the Zf4HPXX4 gearboxes types...which i gather from your reply OC500LEs dunt have..whatever it is...
ZF made several incarnations of the Ecomat transmission. The first few variants were the '0' series for everything from pre-Euro emissions engine to Euro 2 engines. Then came Euro 2/3 with CAN bus communication which required a redesigned transmission and thus the Ecomat 2 was released. The Ecomat 4 was a further development to match Euro 4/5 engines and now the Ecolife is an entirely new development for Euro 5/EEV engines.
First generation: ZF 4/5/6 HP 500/590/600
Second generation: ZF 4/5/6 HP 502C/552C/592C/602C
Third generation: ZF 4/5/6 HP 504/554/594/604
Ecolife: ZF 6 AP 1000B/1200B/1400B/1700B/2000B
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Originally posted by nenepokey:
did ur maths fail? 299PS - 230PS = 39PS?!
Haha my bad!
My math really sucks, i had almost never in my life pass my math and thanks for Powered_By_CNG for giving the correct answer and answering my question the same time -
Dea Dave
ok my bad. I thought Ecomat 4 type is sued in the OC500LE.
so which Ecolite product does our Singapore O500LE use then?And
1) what do the letters AP stand for? we know the old series HP stands for hosepower.
2) what about the 4 digits after AP? do they stand for toruqe ooutput range codes for bbus engines?For example say the bus has 1200Nm toruqe power at optimal revs... it would have the 1200 taggged to it?
Thanks
Yanxin -
Originally posted by ZYX2005:
Dea Dave
ok my bad. I thought Ecomat 4 type is sued in the OC500LE.
so which Ecolite product does our Singapore O500LE use then?And
1) what do the letters AP stand for? we know the old series HP stands for hosepower.
2) what about the 4 digits after AP? do they stand for toruqe ooutput range codes for bbus engines?For example say the bus has 1200Nm toruqe power at optimal revs... it would have the 1200 taggged to it?
Thanks
Yanxinfor me i'm not really sure, but think that our OC500LEs use the ZF6HP592C like the B7RLE.
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Originally posted by ZYX2005:
ok my bad. I thought Ecomat 4 type is sued in the OC500LE.
so which Ecolite product does our Singapore O500LE use then?And
1) what do the letters AP stand for? we know the old series HP stands for hosepower.
2) what about the 4 digits after AP? do they stand for toruqe ooutput range codes for bbus engines?For example say the bus has 1200Nm toruqe power at optimal revs... it would have the 1200 taggged to it?
Thanks
YanxinYour OC 500 LEs have ZF 6HP 592C. Mercedes-Benz aren't bothering to homogolate the Ecomat 4 transmissions with their engines for whatever reason.
AP and HP are designations for Ecolife and Ecomat transmissions respectively. The HP designation has nothing to do with horsepower.
The four digit suffices in the Ecolife designations designate maximum torque transmission capability e.g. 1200B will transmit 1200Nm maximum.
Regards,
Dave -
I find that when the pedal is released and pressed softly (like in a traffic jam situation), the OC's engine emit a sound similar to a Mercedes Benz Actros truck... The sounds do run similar in the Mercedes blood line I guess...
It would sound like a low pitch 'groong...(idle) groong...(idle)'.
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Originally posted by Powered_By_CNG:
Your OC 500 LEs have ZF 6HP 592C. Mercedes-Benz aren't bothering to homogolate the Ecomat 4 transmissions with their engines for whatever reason.
AP and HP are designations for Ecolife and Ecomat transmissions respectively. The HP designation has nothing to do with horsepower.
The four digit suffices in the Ecolife designations designate maximum torque transmission capability e.g. 1200B will transmit 1200Nm maximum.
Regards,
Dave
Ok thanks for the clarification. Oh HP is for Ecomat not horspower..hahhaZYX
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Originally posted by Powered_By_CNG:
Ecolife: ZF 6 AP 1000B/1200B/1400B/1700B/2000B
Wow. These names gave a better idea of how much power/torque the gearbox can handle. However, it sounded abit "Allison-ish". Hehe
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I am beginning to observe that the SBST's Scania K230UB's engine sounds a bit similar to the SMRT's UMW Lances.
Whereas the SMRT's Merc OC500LE's engine sounds like the SMRT's Hino Volgrens.
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Originally posted by TIB1018B:
I am beginning to observe that the SBST's Scania K230UB's engine sounds a bit similar to the SMRT's UMW Lances.
Whereas the SMRT's Merc OC500LE's engine sounds like the SMRT's Hino Volgrens.
EXACTLY!
i so agree to that sentiment -
Yeah at outside when it started accelerating it really sound like hino volgren and braking it sounds like habit braking.