Car Talk!  | | | 
November 6th, 2008, 07:45 PM
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#8581 (permalink)
| | still smoke free
Join Date: Jun 2002 Location: MinneSOta
Posts: 5,225
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I will have to admit that the 5 cylinder sound has a good sound to it. I liked the 5 banger in my brothers Volvo. It has enough of a gritty sound to it, but sounds more refined than an 6 or 4 cylinder. | 
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November 6th, 2008, 07:46 PM
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#8582 (permalink)
| | Megalomaniacal
Join Date: Nov 2004 Location: Spring Hill, FL
Posts: 12,996
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Yup, that I-5 sounded a lot better than I anticipated.
Is it just me, or do all inline motors have a distinct sound in comparison to V motors?
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Last edited by SoloCamo : November 6th, 2008 at 07:52 PM.
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November 6th, 2008, 07:55 PM
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#8583 (permalink)
| | Anime Otaku
Join Date: Oct 2001 Location: Tampa, FL USA
Posts: 108,888
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An I5 is more naturally balanced than an I4, thus the different sound. 
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November 6th, 2008, 07:58 PM
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#8584 (permalink)
| | Megalomaniacal
Join Date: Nov 2004 Location: Spring Hill, FL
Posts: 12,996
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Correct me if i'm wrong here aswell, but isn't the I6 the most finely balanced of common motors? | |
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November 6th, 2008, 08:03 PM
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#8585 (permalink)
| | still smoke free
Join Date: Jun 2002 Location: MinneSOta
Posts: 5,225
| Quote:
Originally Posted by SoloCamo  Correct me if i'm wrong here aswell, but isn't the I6 the most finely balanced of common motors? | Quote:
Originally Posted by RobRich An I5 is more naturally balanced than an I4, thus the different sound. |
Longer crankshaft means smoother running engine..less vibration...which is why a VW beetle's opposed 4 sounds different than an inline 4, and the Subaru's horizontally opposed 4 sounds similar, but different due to the presence of a water jacket.
Also, the difference in sound comes from a different timing on the exhaust pulses.
I always wondered if you changed the length of the pipes on a 4 banger so that the exhaust pulse was in the same tempo as a V8 if it would make a difference in noise quality. Most likely not. | |
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November 6th, 2008, 08:04 PM
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#8586 (permalink)
| | Anime Otaku
Join Date: Oct 2001 Location: Tampa, FL USA
Posts: 108,888
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An I6 is the least cylinder engine with both primary and secondary balance.
Even better, a V12 is even more refined if you want an extremely smooth running engine. It is essentially a twin I6, but it is loading the crankshaft at twice as many times per revolution. | |
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November 6th, 2008, 08:07 PM
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#8587 (permalink)
| | Anime Otaku
Join Date: Oct 2001 Location: Tampa, FL USA
Posts: 108,888
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An I4 has primary balance but lacks secondary balance, which is the reason many performance I4 engines like the Mitsu 4G63 have balance shafts.
Some enthusiasts eliminate the balance shafts, install poly engine mounts, then wonder why their econosport feels like it is going to shake apart. Going further, toss in set of 272 cams in a 4G63, and you can get a near V8 feel and sound at idle. | |
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November 6th, 2008, 08:07 PM
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#8588 (permalink)
| | still smoke free
Join Date: Jun 2002 Location: MinneSOta
Posts: 5,225
| Quote:
Originally Posted by RobRich An I6 is the least cylinder engine with both primary and secondary balance.
Even better, a V12 is even more refined if you want an extremely smooth running engine. It is essentially a twin I6, but it is loading the crankshaft at twice as many times per revolution. | Then you got the V16 for the grand daddy of all automotive motors...I've heard the V12 in an old Auburn in a parade....my god that was smooth sounding for 1930's tech. | |
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November 6th, 2008, 08:16 PM
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#8589 (permalink)
| | Anime Otaku
Join Date: Oct 2001 Location: Tampa, FL USA
Posts: 108,888
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Thinking a little more modern, the Jaguar XK-E typifies the classic V12 sports car IMO. | |
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November 6th, 2008, 08:27 PM
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#8590 (permalink)
| | Megalomaniacal
Join Date: Nov 2004 Location: Spring Hill, FL
Posts: 12,996
| Quote:
Originally Posted by RobRich Some enthusiasts eliminate the balance shafts, install poly engine mounts, then wonder why their econosport feels like it is going to shake apart. Going further, toss in set of 272 cams in a 4G63, and you can get a near V8 feel and sound at idle. | What would be the reason for removing the balance shafts? Unless of course it's for something ridiculous like saving weight.  Maybe it allows the engine to rev faster due to one less moving part? I'm probably wayyyy off | |
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