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phaeton
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 Posted: Tue Aug 14, 2007 1:49 am Post subject: Engine Sounds by type |
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What is the general (or specific) reason why:
Almost all inline 4cylinders sound alike
Almost all boxer 4cylinders sound alike
V6s sound like V6s, but inline 6s sound like inline 6s
And of course, nothing has the 'trademark V8 sound' like a V8..
(seemingly regardless of manufacturer, fuel type, or displacement
size)
Thanks.
-ph |
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BobG
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| Posted: Tue Aug 14, 2007 1:49 am Post subject: Re: Engine Sounds by type |
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Do all V twin motorcycle engines go 'potato-potato-potato'?
Maybe the 'envelope' of the 'bangs per sec' is similar for each type? |
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Nate Nagel
Guest
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| Posted: Tue Aug 14, 2007 1:49 am Post subject: Re: Engine Sounds by type |
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phaeton wrote:
| Quote: | What is the general (or specific) reason why:
Almost all inline 4cylinders sound alike
Almost all boxer 4cylinders sound alike
V6s sound like V6s, but inline 6s sound like inline 6s
And of course, nothing has the 'trademark V8 sound' like a V8..
(seemingly regardless of manufacturer, fuel type, or displacement
size)
Thanks.
-ph
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It has to do with firing order, and the logical combining of exhaust
pipes. A straight six with split manifolds 3/3 like a BMW makes for a
smooth yet sweet sound. The V-8 "lope" is because the firing order is
generally 1-8-4-3-6-5-7-2 yet the exhaust pipes are combined 1-3-5-7 and
2-4-6-8, so you have the 8-4 and 5-7 pulses right next to each other in
the same pipe, with the delay between 1-3 and 6-2 being longer, so each
pipe gets pulse-wait-wait-pulse-wait-pulse-pulse-wait, 180 degrees out
of phase with each other (well, that's 180 degrees of *cam* but 360
degrees of *crank...* you get the idea, anyway) if a V-8 is set up with
an even fire exhaust like some old mid-engine racers (GT40 comes to
mind) it sounds a lot like a straight six, but more so, but the exhaust
looks like a bundle of drunken snakes. A V-12 is basically like two
straight sixes put together, so they sound really smooth as well.
V6's sound like *** because there's no natural way to even out a V6 and
also have it balanced. Four cylinders sound like I-6's but a little
rougher, which you'd expect. Boxers sound unique, and to be honest I'm
not sure why, maybe it has something to do with the necessity to have
the two main exhaust pipes separated for a while before they come
together (if they ever do.)
Then there's esoterica like how V-8s with siamesed center exhaust ports,
like old flathead Fords, Studebakers, and early Caddys might not be as
efficient as a modern head/exhaust design but they sound oh so good...
something about combining the 3/5 and 2/4 ports makes the exhaust get
all nasty sounding...
nate
--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel |
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