what is butterfly valve for?

Lucky Song · 01-05-2008, 12:57 AM

anyone know what is butterfly valve for? any reason? thanks if more info

hl0m4n · 01-05-2008, 01:04 AM

Quote:

Originally Posted by Lucky Song

anyone know what is butterfly valve for? any reason? thanks if more info

keeps your left muffler closed on startup and as you drive at higher speed with engine temps increasing it will open up. if you look in the cold and start the car you will notice smoke is only comming through your right pipe.

also for noise purposes.

ChrisMT79 · 01-05-2008, 01:12 AM

Quote:

Originally Posted by hl0m4n

keeps your left muffler closed on startup and as you drive at higher speed with engine temps increasing it will open up. if you look in the cold and start the car you will notice smoke is only comming through your right pipe.

also for noise purposes.

Yes and heres a great site to get the in's and out's of engines in general.
http://www.howstuffworks.com/

Lucky Song · 01-05-2008, 01:29 AM

Quote:

Originally Posted by hl0m4n

keeps your left muffler closed on startup and as you drive at higher speed with engine temps increasing it will open up. if you look in the cold and start the car you will notice smoke is only comming through your right pipe.

also for noise purposes.

thanks man!!

SoYank · 01-05-2008, 07:17 AM

Quote:

Originally Posted by Lucky Song

anyone know what is butterfly valve for? any reason? thanks if more info

It depends on the context. A butterfly valve in a carburator restricts the flow of air into the venturi. As you open the throttle, more air gets in and therefore more fuel is drawn into the air/fuel mixture and the higher the engine revs.

ENINTY · 01-05-2008, 08:11 AM

... or it keeps the butterflies out of the combustion chambers.

MBChariot · 01-05-2008, 12:36 PM

Quote:

Originally Posted by ENINTY

... or it keeps the butterflies out of the combustion chambers.

exo-ak-dk · 01-05-2008, 02:10 PM

we have so many weird things today

PaulBailey@ltbmw · 01-05-2008, 03:48 PM

Is this effective?

tctic · 01-06-2008, 01:52 AM

Not sure if this thread was started because of "Valvetronic".. but in the N52 engine (325, 328, 330) the throttle butterfly is fully opened at all times, except in special circumstances or when Valvetronic fails. When you control the throttle, you are actually controlling the amount of valve lift thus controlling air flow. This technology is pioneered by BMW and was also recently implemented in the Infiniti's latest VQ Engines.

HyperM3 · 01-06-2008, 09:28 AM

Why did the op start a new thread when they got their answer in the previous one they started?

http://www.e90post.com/forums/showthread.php?t=105206

01-05-2008, 12:57 AM	#1
Lucky Song Private 5 Rep 58 Posts Drives: 2007 metallic blue! Join Date: Sep 2007 Location: n.j iTrader: (0)	what is butterfly valve for? anyone know what is butterfly valve for? any reason? thanks if more info
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01-05-2008, 08:11 AM	#6
ENINTY Banned 173 Rep 3,415 Posts Drives: 2006 325i Sport Join Date: Jun 2006 Location: Virginia iTrader: (0)	... or it keeps the butterflies out of the combustion chambers.
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01-05-2008, 02:10 PM	#8
exo-ak-dk Black Magic Wheels - BMW 36 Rep 1,090 Posts Drives: E90 Join Date: Aug 2007 Location: Denmark iTrader: (0)	we have so many weird things today
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01-05-2008, 03:48 PM	#9
PaulBailey@ltbmw General 663 Rep 26,878 Posts Drives: 2-325 330 2-335 2-Z4 2-135 X5d Join Date: Mar 2007 Location: Huntington Beach, CA iTrader: (34) Garage List 2008 BMW 335i E90 [7.00] 2011 BMW 335i E92 [7.96]	Is this effective?
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01-06-2008, 01:52 AM	#10
tctic Major 38 Rep 1,238 Posts Drives: BMW E90 Join Date: Oct 2005 Location: Canada iTrader: (0)	Not sure if this thread was started because of "Valvetronic".. but in the N52 engine (325, 328, 330) the throttle butterfly is fully opened at all times, except in special circumstances or when Valvetronic fails. When you control the throttle, you are actually controlling the amount of valve lift thus controlling air flow. This technology is pioneered by BMW and was also recently implemented in the Infiniti's latest VQ Engines.
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01-06-2008, 09:28 AM	#11
HyperM3 Too many Alex's, from now on, call me Beaufort 342 Rep 6,188 Posts Drives: See Sig Join Date: Feb 2007 Location: Lawrenceville, NJ iTrader: (8)	Why did the op start a new thread when they got their answer in the previous one they started? http://www.e90post.com/forums/showthread.php?t=105206 __________________ 13 HD FatBob 17 A4 Glacier/Black 1st Edition/Pre+/Sport/EurocodeTMD/Racechip 16 S6 (gone),14 S6 (gone),14 S6 (gone),13 S6 (gone),10 S4 (gone) 07 335i(gone)
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