Mr K
Posted a lot
Posts: 2,993
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Sept 25, 2006 19:12:37 GMT
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today i was having lunch at work and heard a burbling behind me, imediatly i reconsied it as some kinda flat engine, and took a guess at a scooby, and sure enough, there was a black bug eye estate just parking up behind me.
this got me thinking, why does a generic flat 4 sound any different that a v4, or a strait 4? is it all down to the fact that the exhausts are of different configuations? but then you could make a strait 4 sound like a flat 4 by changing the length of the primarys, so thats not very likly.
or is it just down to the strength of the blocks and the way they resionate?
So, come on guys, why doesnt a v4 sound like a strait 4?
Discuss!
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Last Edit: Sept 25, 2006 19:12:52 GMT by Mr K
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Sept 25, 2006 19:15:02 GMT
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I believe the characteristic scooby sound is due to unequal length downpipes on the exhaust manifolds.
Firing order plays a part in the melody too.
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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slammed 66
Posted a lot
www.gtturbo.org
Posts: 1,675
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Sept 25, 2006 19:25:53 GMT
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I believe the characteristic scooby sound is due to unequal length downpipes on the exhaust manifolds. Exactly right! A chavaru sh1trezza with equal length down pipes sounds like any other flat 4 rather than an off beat mess. Engine sounds are down to which order the gasses are expelled in and exhaust length/bore and and shape |
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86 Renault 5 GT Turbo 89 Renault extra 91 Skyline GTR 98 Mini 1275 mpi 99 Autech Rider www.gtturbo.org |
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Sept 25, 2006 19:31:50 GMT
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scooby flat four is a boxer engine thats where the distinct sound comes from along with the unequal pipes but the boxer 4 has a distinct sound but the scooby has its own as does the beatle ect. but its not the only type of engine that has a distinct sound some engines of the same type have their own distinct sound be it SOHC or OHV take a pinto or a crossflow for instance both have a sound all of their own  |
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Last Edit: Sept 25, 2006 19:38:09 GMT by Deleted
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Sept 25, 2006 19:39:25 GMT
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all engines have a sound of their own IMO, I'm not saying i can name loads of engines by their sound, but theres a fair few cars i can name when they drive pass without even looking at them. its mainly cars ive had alot of contact with eg minis, golfs, transits, fiesta, suzuki swifts, astra the list goes on.
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Sept 25, 2006 19:52:52 GMT
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The scooby sounds the way it does becuase of the very poor stock exhaust manifold, the unequal lengths mean the exhaust pulses reach the turbo like this ||-|| if it has a equal length manifold the pulses will reach the turbo like this |-|-|-| The flat four firing sequence does make a different sound to a straight four, but this is empasised by the poor manifold. If a straight four engine has a manifold that is a 4-2-1 configuration and the pipes are joined 1&2 and 3&4 then it will sounds weird this is a good example of an engine that should sound different - video.google.com/videoplay?docid=-3566399109857676893&q=hayabusathat should sound like a hayabusa, it dosent! And thats poor manifold design! J |
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Sept 25, 2006 19:55:07 GMT
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Oh and you can always tell a kent engine from a fiesta because you cant hear the exhaust over the tappet noise  |
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Sept 25, 2006 19:58:46 GMT
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I like a nice 3-cylinder warble! Even those Polo diesels sound KWAL in 3-cyl flavour!
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1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT! |
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Sept 25, 2006 20:00:00 GMT
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A Scooby sounds like an Alfa boxer lump. Not surprising considering that Subaru effectively copied the Alfa design. I never did find out why an Alfa boxer 'crackles' on the over-run.
The Alfa boxer is my favourite sounding engine of all - closely followed by the 'big bang' Honda V4 bike lumps. They sound like a machine gun on full throttle at low to mid revs and scream like nothing else when you hit 10k rpm. Lovely.
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Prius T-Spirit, Alfa 156 Sportwagon, Alfa 75 TSpark Veloce, Mazda MX-5 1.8iS
Honda VFR750FT, Ducati 750SS, BMW R100RT, Hongdou GY200
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Shortcut
Posted a lot
I won't be there when you cross the road, so always use the Green Cross Code.
Posts: 3,037
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Sept 25, 2006 20:00:24 GMT
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well our dog recognises both the golf and the peugeot when they pull up outside and her littel head pops up at the window.
So she must be a petrol head!
woof
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This space available to rent. Reach literally dozens of people. Cheap rates!
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Sept 25, 2006 20:14:25 GMT
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The crackle from the alfa lump will be becuase of the fuel available on overrun from the carbs, the subaru will have fuel cutoff on overrun. I too love the honda V4 lumps, especially the VFR400, screaming pulsing crazyness. And did someone say three cylinder? Oh the charade engine was ace, i miss that sound so much, it was like half a skyline! Some vids for the sound - video.google.co.uk/videoplay?docid=-250279575414711013&q=gttiThis one is really quick, check it out having an E30 M3! video.google.co.uk/videoplay?docid=-5666038346722001308&q=gttiSkip to about half way through this one for some awsone wastegate chatter video.google.co.uk/videoplay?docid=4117728550631024395&q=charade+turboAnything that alters the way the exhaust pulse will make the car sound different, thats why rotary engines sound crazy, no valves etc makes for one very loud exhaust note. Changing the cam will change the way the exhaust pulse behaves when its let out and how fast it is released, again this is why ported rotaries go BRAP BRAP BRAP BRAP! J |
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Last Edit: Sept 25, 2006 20:17:57 GMT by Blown_Imp
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stinkwheel
Posted a lot
Doctor Of Gonzo Journalism - One of gods own proptypes, never even considered for mass production.
Posts: 2,280
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Sept 25, 2006 20:15:06 GMT
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AFlat fours definitly sound different to most things but the biggest selling and earliest flat foour of that type was in the citroen GS (i don't count bettles as they are horrid) :-P
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1973 Citroen Dyane 6 1980 Citroen Acadiane
1992 Citroen AX 1990 Citroen BX
1997 Citroen XM 1993 Citroen BX
1997 Citroen Xantia 1977 Citroen Ami 8
1996 Ford Escort 1989 Citroen BX
1997 Suzuki RF900 1988 Yamaha TDR250
1979 Honda CB400.
'I need less vehicles'
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Sept 25, 2006 21:03:30 GMT
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My dad loves the sound of flats so much that, not contented by his Impreza, he bought a brand new BMW R1200GS bike.
Actually I think it was coincidence, but still, I love being woken up at 7am by the warbling of subaru or the burbling of the beemer.
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1997 TVR Chimaera
2009 Westfield Megabusa
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Sept 25, 2006 21:34:13 GMT
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Flat 4's always sound good ! well.....some are good, and some are just interesting... my 1600 bug with twin 40's on sounds grand anyway !  |
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stinkwheel
Posted a lot
Doctor Of Gonzo Journalism - One of gods own proptypes, never even considered for mass production.
Posts: 2,280
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Sept 25, 2006 21:37:10 GMT
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hehe, i wondered how many bug owners i would upset :-)
i owned one once it broke a few times and i made a nice profit, so there :-)
Old BMW K series bikes are lat inline 4's they had a distinct sound.
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1973 Citroen Dyane 6 1980 Citroen Acadiane
1992 Citroen AX 1990 Citroen BX
1997 Citroen XM 1993 Citroen BX
1997 Citroen Xantia 1977 Citroen Ami 8
1996 Ford Escort 1989 Citroen BX
1997 Suzuki RF900 1988 Yamaha TDR250
1979 Honda CB400.
'I need less vehicles'
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bstardchild
Club Retro Rides Member
Posts: 14,958
Club RR Member Number: 71
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Engines and their screams...bstardchild
@bstardchild
Club Retro Rides Member 71
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Sept 25, 2006 23:16:14 GMT
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Old BMW K series bikes are lat inline 4's they had a distinct sound. But the triple sounds better and is a much better drive/ride I like triples had a few suzuki/kwacker 2 stroke triples years ago 3 and 6 are magic numbers |
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Tarka
Part of things
Posts: 905
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Sept 25, 2006 23:16:43 GMT
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I like the sound of the Volvo 5 cylinder on the 850, like a whirring burble. Also like the noise of modern Merc Diesels, are these 5 cylinder too??
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Sharks in the garage.🐬🇩🇪
I'll finish my projects when you've finished your's!😎😜
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Sept 25, 2006 23:18:07 GMT
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Give a VR6 a decent exhaust and some ITBs and it sounds...almost perfect...
*n
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Top grammar tips!
Bought = purchased. Brought = relocated
Lose = misplace/opposite of win. Loose = your mum
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Sept 25, 2006 23:31:49 GMT
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The crackle from the alfa lump will be becuase of the fuel available on overrun from the carbs, the subaru will have fuel cutoff on overrun. I too love the honda V4 lumps, especially the VFR400, screaming pulsing crazyness. And did someone say three cylinder? Oh the charade engine was ace, i miss that sound so much, it was like half a skyline! Well, my Alfa had Bosch KE-Jetronic. Might not have had a fuel cut-off due to it's age, though. Fiat Lampredi lumps sound nice, as do old Alfa TSparks. Not so sure about the newer 16v TSparks, though. Not forgetting my Fiat Marea with it's crazy 5 cylinder lump. That made me grin every time I drove it. |
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Last Edit: Sept 25, 2006 23:32:46 GMT by twinspark
Prius T-Spirit, Alfa 156 Sportwagon, Alfa 75 TSpark Veloce, Mazda MX-5 1.8iS
Honda VFR750FT, Ducati 750SS, BMW R100RT, Hongdou GY200
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tigran
Club Retro Rides Member
In rust we trust. Amen.
Posts: 6,444
Club RR Member Number: 142
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Engines and their screams...tigran
@tigran
Club Retro Rides Member 142
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Sept 25, 2006 23:32:49 GMT
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*can't hear wibblepoo over the tappets*
SPEAK UP
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1964 Rover P5 i6
1987 BMW 525e - The Rusty Streak
1992 Micra K10
2001 BMW E46 316i
2002 BMW E46 330Ci
2013 BMW F31 320d
2018 BMW G31 530d
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