Why do Class 66s ying?

[Mordac]

What makes that noise? My guess is traction motors, but it is just a guess..

 

[hexagon789]

I believe it is simply the noise made by the Prime Mover operating at idle revs. Class 59s and 60s make a similar noise and you hear it on the 66s mainly when they are coasting or stationary. I hasten to add this is simply an opinion formed from observations, I could well be completely wrong.

 

[SpacePhoenix]

It's also a kinda similar noise that the 67s make when idling

 

[ExRes]

It's actually the screaming of the drivers as they are being catapulted about the cabs by the appalling seats

 

[Cowley]

It's actually the screaming of the drivers as they are being catapulted about the cabs by the appalling seats

I always thought it was just the slightly unusual sound that a two stroke diesel makes. I remember Detroit Diesel engines (also two stroke) in lorries in the 80s having a slightly unusual (and not dissimilar) sound when they were ticking over.

 

[dubscottie]

Its the turbo charger. Nearly all two stroke GM diesels do it.

 

[BestWestern]

I believe it is simply the noise made by the Prime Mover operating at idle revs.

Ughhhh :cry: :cry:

It's an engine! An engine!! I can live with powerplant, if one must use mildly daft terms, but please not the dreaded "prime mover". Pure American trash talk. How many British locomotives have a "secondary mover", for heaven's sake? There is only one, and it's called the engine! As for "head end power"....

OH MY GAAAAAAAAAAAAD as our Yankee cousins might say :roll:

 

[squizzler]

It's a two stroke engine which, unlike 4 stroke, does not naturally pump the gasses through. The inlet air needs to be maintained at a positive pressure so the charge air purges the exhaust when both inlet and exhaust ports are open.

The turbo maintains this inlet pressure at high revs but at low revs this is augmented by mechanical drive to the turbocharger (as per traditional supercharger). I think it is this mechanical drive to the blower that makes the prime - ahem, engine - "ying" at low speed.

 

[BestWestern]

It's a two stroke engine which, unlike 4 stroke, does not naturally pump the gasses through. The inlet air needs to be maintained at a positive pressure so the charge air purges the exhaust when both inlet and exhaust ports are open.

The turbo maintains this inlet pressure at high revs but at low revs this is augmented by mechanical drive to the turbocharger (as per traditional supercharger). I think it is this mechanical drive to the blower that makes the prime - ahem, engine - "ying" at low speed.

Well done, sir

 

[Yew]

Ughhhh :cry: :cry:

It's an engine! An engine!! I can live with powerplant, if one must use mildly daft terms, but please not the dreaded "prime mover". Pure American trash talk. How many British locomotives have a "secondary mover", for heaven's sake? There is only one, and it's called the engine! As for "head end power"....

OH MY GAAAAAAAAAAAAD as our Yankee cousins might say :roll:

Literally all diesel electric locomotives have a secondary mover, the traction motors...

 

[rebmcr]

How many British locomotives have a "secondary mover", for heaven's sake?

Class 73 springs to mind.

 

[Suraggu]

Ughhhh :cry: :cry:

It's an engine! An engine!! I can live with powerplant, if one must use mildly daft terms, but please not the dreaded "prime mover". Pure American trash talk. How many British locomotives have a "secondary mover", for heaven's sake? There is only one, and it's called the engine! As for "head end power"....

OH MY GAAAAAAAAAAAAD as our Yankee cousins might say :roll:

It is also how certain European nations call Engines.

 

[D365]

It's also a kinda similar noise that the 67s make when idling

Well they use the same engine...

 

[zn1]

I was always told to refer a Diesel locomotive engine as a "power unit"

 

[43096]

I was always told to refer a Diesel locomotive engine as a "power unit"

To me, on a diesel electric, "power unit" = engine + generator/alternator.

The engine is the engine!!!!!

 

[DarloRich]

What makes that noise? My guess is traction motors, but it is just a guess..

it is the souls of all the spotters who detest them being crushed as they cover the land like locusts

 

[ExRes]

I was always told to refer a Diesel locomotive engine as a "power unit"

On all my traction courses I was directed to the 'engine compartment', never the 'prime mover compartment' or 'power unit compartment' so boring old 'engine' was always good enough for me

 

[Mordac]

Thank you very much to everyone who replied. Very helpful.

While we're on the subject of traction noises, someone wouldn't know why Desiros sing?

 

[Mordac]

it is the souls of all the spotters who detest them being crushed as they cover the land like locusts

They just hate that there's so many of them, they'll never clear the class.

 

[BestWestern]

Literally all diesel electric locomotives have a secondary mover, the traction motors...

Is that the Yank term for those? A diesel-electric locomotive only has one set of 'movers', the traction motors. The engine doesn't 'move' anything (except the alternator!), it generates!

 

[BestWestern]

Class 73 springs to mind.

Ah ha, but they still only have one means of moving - the traction motors. They're just dual powered!

A Western could be said to have more than one 'mover', but they might argue over which of them is "prime"!!

 

[GW43125]

Thank you very much to everyone who replied. Very helpful.

While we're on the subject of traction noises, someone wouldn't know why Desiros sing?

It's me wailing at the thought of having to hear/travel on the b-----d things

 

[Bletchleyite]

Is that the Yank term for those? A diesel-electric locomotive only has one set of 'movers', the traction motors. The engine doesn't 'move' anything (except the alternator!), it generates!

Isn't it meant to be (in US-speak) that the prime mover is the "big engine" that generates traction power, while there might be a separate generator for doing hotel power etc?

 

[HSTEd]

U How many British locomotives have a "secondary mover", for heaven's sake? There is only one, and it's called the engine!

The Fell Diesel is coming.
It will never stop hunting you.

 

[BestWestern]

The Fell Diesel is coming.
It will never stop hunting you.

Scrapped aged 8 Pure evil!

 

[dgl]

Thank you very much to everyone who replied. Very helpful.

While we're on the subject of traction noises, someone wouldn't know why Desiros sing?

Due to the IGBT traction covertors, the reason for the noise is due to the high frequency (well into the audio range) that the convertors work at (these are the devices that control the power going to the traction motors), listen to the Electric EuroSprinter (i.e. the ÖBB Taurus) for some more impressive 'singing'.

 

[43096]

Due to the IGBT traction covertors, the reason for the noise is due to the high frequency (well into the audio range) that the convertors work at (these are the devices that control the power going to the traction motors), listen to the Electric EuroSprinter (i.e. the ÖBB Taurus) for some more impressive 'singing'.

I was going to say.... Desiros do not sing.

Taurus 1 and Taurus 2 locos are a completely different matter though! Absolutely magnificent machines.

 

[PaxVobiscum]

Due to the IGBT traction co[n]vertors...

Does the engineering need to be inclusive nowadays as well?

(goes in to hiding)

 

[Strathclyder]

Almost all locomotive types fitted with a specific variant of the EMD 710 powerplant (12N-710G3B-EC, to be precise) make the 'ying-ying' noise when at idle. The locos fitted as such are:

• Classes 66 & 67
• Iarnród Éireann 201 Class
• RENFE Class 334
• Long Island Railroad DE30ACs/DM30ACs

All except the Long Island locos emit the 'ying-ying' noise.

 

[E_Reeves]

Almost all locomotive types fitted with a specific variant of the EMD 710 powerplant (12N-710G3B-EC, to be precise) make the 'ying-ying' noise when at idle. The locos fitted as such are:

• Classes 66 & 67
• Iarnród Éireann 201 Class
• RENFE Class 334
• Long Island Railroad DE30ACs/DM30ACs

All except the Long Island locos emit the 'ying-ying' noise.

https://www.youtube.com/watch?v=a3FD-228ZvQ

That should work for the last link. I think you did http://https://... by accident.