Similarly the Tin Worm is present in older cars, Fiats especially. It is a variety native to the northern climes, where the steel is mined, and becomes torpid in sunny weather. However it becomes active again in northern winters.
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Slightly(!) off topic…
Back in the 70’s I had a couple of Fiat Ritmos that I bought new and, as I tend to do, kept them for years. After about 9 years (and about 300,000 Kms of really quite trouble-free use-really) the old tin worm was very active.
Once, at a social gathering, talk turned to collecting objets d’art. I did no such thing but added to the conversation that I collected antiques, Italian antiques. When pressed whether I specialised I had to admit that my collection was exclusively Fiat.
Not sure if it’s the same sort of “humming” but the older Merc’s (NG, SK series) always had a very distinctive sort of whistling tone to them, you always could pick 'em out if you heard them from a distance.
pv83:
Not sure if it’s the same sort of “humming” but the older Merc’s (NG, SK series) always had a very distinctive sort of whistling tone to them, you always could pick 'em out if you heard them from a distance.
Like the howl of a well worn twin splitter approaching , couldn’t mistake that sound .
The whistling on the Spanish barrios, the turbo was a noise you got with every gear change.
we called it [RONNIE -RENALL] if your my age you will remember him on the radio, whistling for England.
.As all driver back then drove mostly by their ears as the window would never close, until the big G came along with the exhaust coming out at the front you got so deaf you could not hear anything. the only humming I get is when my ear- in -aid wants a new battery, and that can whistle when it wants ,courtesy of all the old trucks from 1967…it was either the engine noise , under sacks and coats or the old B.M.C.EXHAUST.
then going back what about the driver who smoked woodbines or park drive now there was a sound first thing in the mornings. that beat any engine whistling I think it was wheezing…and you could hear them coming down the road a hacking cough.
As for the land rover what a lazy load of zb,s you ever did meet,i used to go in there regular, every day was a friday.they were the gremlins that worked there,like a lot of the old BMC outfits sorry off topic ,but its the deafness .dbp
Well my fave Humming engine was the good old Leyland 680 PP, I had it my good old Foden MET 547 G, With a Foden 12 speed box 52 mph top speed , I can still feel & hear it yet on the pull running Fish up to Frazerbrough in the 70s, Only minutes behind the Scanias & the Volvos, Happy days IMO, Regards Larry.PS & I made good money at this time.
Then there was gearbox whine! Older MANs when they’d been round the clock a bit used to have a good 'un; but my favourite was the AEC buses - the earlier Regals and Regents. They didn’t just whine, they sang! Robert
Punchy Dan:
Some interesting posts however the noise we were talking of was only while 2 lorries were side by side passing .
I can’t say I noticed any strange noises when I was overtaking everything Dan?
Pete.
Probably because iirc you held everything up and past nothing
Aye you’ll know all about “humming” Dan’ll running a Foden ! Cheers Dennis.
& So do I Dennis, Fodens were tops in my younger days as an owner driver, But there were drivers & drivers in those days & most likley nothing has changed today, A Foden wagon had a chassis better than any other motor IMO, Plus the 12 speed box OK Some drivers didnt like them , Or was it perhaps that they couldnt master them, Well Im not a one to boast but I was born to drive a Foden I think I loved the old 12 speed box With a gear for every hill, , Im just having a few drams of Glenmorangie SM Before I turn in , Regards Larry.
Punchy Dan:
Some interesting posts however the noise we were talking of was only while 2 lorries were side by side passing .
Could be similar to what C.F. was talking about regarding multi engine planes?
Anyways, (adopts standing position by blackboard) there is what’s called “interference effects” in wave patterns. Sounds are waves like water waves and light waves*.
Imagine two sources of water waves producng waves at the same frequency. At any spot the two waves could meet
Peak to peak.
Trough to trough.
Peak to trough.
If a peak and trough meet, they cancel each other out.
If two peaks meet they add up to a bigger peak. Same with troughs.
If a truck is slowly passing another one, the waves will come into phase (peak to peak) with each other producing a louder sound; then move out of phase (peak to trough).
As the trucks pass, assuming similar engine revs etc, as the distance between them changed the phasing will change, hence a rising/falling of volume.
Why is less common now?
Maybe the truck you’re driving is doing significantly different revs than other (modern!) trucks?
Maybe we now hear less engine related noises, and only get “white noise” from the tyres?
There’s gotta be video somewhere of interference…
Not a Benny Hill one.
I’ll have a look.
*Yeah, ok, depends how you look at light! Punny stuff!!
Want to prove it with sound? Get two loud speakers put them out side (avoid echoes from walls) several metres apart and play a continuous note through them. It needs to be a simple pure note, as a changing frequency, such as from music, will be of varying frequency and the points of constructive or destructive interference will change accordingly. By moving yourself between the two speakers you should detect a rise/fall in volume.
With the passing trucks, some notes will be in phase and increase in volume, depending on position. As they pass other note s will come in and out of phase so theyll likely be a series of slightly different toned rises and falls. I cant say thats it, but I reckon its possible.
pv83:
Not sure if it’s the same sort of “humming” but the older Merc’s (NG, SK series) always had a very distinctive sort of whistling tone to them, you always could pick 'em out if you heard them from a distance.
Like the howl of a well worn twin splitter approaching , couldn’t mistake that sound .
Another sound that has vanished with all them bloody auto 'boxes mate
Punchy Dan:
Some interesting posts however the noise we were talking of was only while 2 lorries were side by side passing .
I can’t say I noticed any strange noises when I was overtaking everything Dan?
Pete.
Probably because iirc you held everything up and past nothing
With Kays setting the limiter at 52 mph you are possibly correct Dan, I could achieve that easily with another gear still to go at! Noises; rattling Spicer gearboxes, moaning Reiver transfer boxes, Cargo and Clydesdale drivers false teeth clanking together.
Robert
Cheers Dennis.
Noises; rattling Spicer gearboxes, moaning Reiver transfer boxes, Cargo and Clydesdale drivers false teeth clanking together.