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Noisy blower
#1522582
10/24/13 10:15 AM
10/24/13 10:15 AM
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Joined: May 2004
Posts: 952
Stockholm, Sweden
MrSixpack
OP
super stock
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OP
super stock
Joined: May 2004
Posts: 952
Stockholm, Sweden
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Is it the straight cut gear in the blower or the belt and pulley's that makes the nice sound? Thanks 
1970 Super Stock Challenger ex. Paul Rossi
1968 Dodge Dart GT 340
1968 Dodge Charger /6 3 speed manual
1966 Chrysler 300 Loaded
1968 Dodge Charger R/T 440
1968 Mini Cooper
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Re: Noisy blower
[Re: DusterDave]
#1522586
10/24/13 01:28 PM
10/24/13 01:28 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Belt and pulleys.
Kevin
From what I've read, the blower whine comes from the air getting compressed where the belt teeth engage the pulley teeth.
Could be, I don't know for sure. I have always been strapped in a dragster with zoomie pipes and I don't think you could hear the belt, but you sure hear the whine of the screw blower.
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Re: Noisy blower
[Re: MrSixpack]
#1522587
10/24/13 02:04 PM
10/24/13 02:04 PM
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Joined: Oct 2006
Posts: 427
Sweden
Mopar Guy
mopar
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mopar
Joined: Oct 2006
Posts: 427
Sweden
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Hi Micke, The belt shore is noise so that should be what you like then  Hope al is well  /Pat down south
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Re: Noisy blower
[Re: Cab_Burge]
#1522589
10/24/13 02:25 PM
10/24/13 02:25 PM
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Joined: May 2004
Posts: 952
Stockholm, Sweden
MrSixpack
OP
super stock
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OP
super stock
Joined: May 2004
Posts: 952
Stockholm, Sweden
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Its a 6/71 striped BDS blower for nostalgia racing. Thanks 
1970 Super Stock Challenger ex. Paul Rossi
1968 Dodge Dart GT 340
1968 Dodge Charger /6 3 speed manual
1966 Chrysler 300 Loaded
1968 Dodge Charger R/T 440
1968 Mini Cooper
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Re: Noisy blower
[Re: Cab_Burge]
#1522591
10/24/13 03:19 PM
10/24/13 03:19 PM
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Joined: May 2003
Posts: 6,566
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,566
Downtown Roebuck Ont
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Quote:
Quote:
Its a 6/71 striped BDS blower for nostalgia racing.
Thanks
I think the front drive gears on the Roots blowers are what make the most noise, maybe not  
I'm sure they contribute to "the sound" but my understanding is that as the belt cogs engage the pulley, they displace the air in the grooves at very high speed thus the "whistle".
Kevin
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Re: Noisy blower
[Re: Challenger 1]
#1522592
10/24/13 04:26 PM
10/24/13 04:26 PM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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Quote:
IMO, to hear the sweet sound, you must run a screw blower. It's not the belt, it's the rotors that you are hearing and a screw blower sounds so sweet.
I agree, nothing sounds as sweet as that. I just freshened a customers screw blown pro-mod with 11 MM pitch on the belt. There's a lot going on with the drive gears, the screw rotors and belt pitch. It's hard to tell where the sound actually comes from, but I think all three area's contribute.
machine shop owner and engine builder
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Re: Noisy blower
[Re: DusterDave]
#1522593
11/02/13 05:01 AM
11/02/13 05:01 AM
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Joined: Mar 2008
Posts: 26
North Carolina
southernman
member
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member
Joined: Mar 2008
Posts: 26
North Carolina
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Duster Dave, you are absolutely correct; It is the sound of air being compressed between the belt and pulleys.
In an effort to reduce noise, some resort to drilling holes in bottom of the pulley grooves to reduce pressure, thereby reducing the noise, but it's a small reduction at best and not worth the time.
In fact, if you remove the belt and simply spin the blower, the snout has it's own oil reservoir, running with angle-cut gears in most cases, and they don't make much noise at all.
Again, its the belt and pulleys that make the noise, and what a sweet noise it is !
Southernman
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Re: Noisy blower
[Re: southernman]
#1522594
11/02/13 07:59 AM
11/02/13 07:59 AM
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Joined: Jul 2010
Posts: 1,845
Tampa
DusterDave
top fuel
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top fuel
Joined: Jul 2010
Posts: 1,845
Tampa
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Quote:
Duster Dave, you are absolutely correct; It is the sound of air being compressed between the belt and pulleys.
In an effort to reduce noise, some resort to drilling holes in bottom of the pulley grooves to reduce pressure, thereby reducing the noise, but it's a small reduction at best and not worth the time.
In fact, if you remove the belt and simply spin the blower, the snout has it's own oil reservoir, running with angle-cut gears in most cases, and they don't make much noise at all.
Again, its the belt and pulleys that make the noise, and what a sweet noise it is !
Southernman
Winna-winna!! Chicken dinna!! 
Gone to the dark side with an LS3 powered '57 Chevy 210
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Re: Noisy blower
[Re: DusterDave]
#1522595
11/02/13 12:37 PM
11/02/13 12:37 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Why then do some whine like a banshee and some run fairly quite? I could see 1/2" pitch being noisier due to more surface area compared to say 8mm. I have a Littlefield 14-71 with 8mm drive assembly for the Hemi and I don't like that really loud screeching whine I have heard on some cars so Dan I hope you read this LOL. There is a guy in town with a black 55 chevy with 600+ cubes running a roots blower and not much wine to it and sounds badass to the bone and man this 55 goes......
Last edited by Superfreak; 11/02/13 12:49 PM.
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Re: Noisy blower
[Re: MrSixpack]
#1522598
11/02/13 09:18 PM
11/02/13 09:18 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Depending on the blower, there is some level of gear noise. Even the small blowers with serp belt setups have some whine. The "71" series blowers make some level of gear whine even in thier intended application(gear driven diesels).
That beeing said, I've dealt with a few blower cars, all had 14mm belts. The noise the belt makes far exceedes the noise the gears make. I've also found(contradictory to what I thought) that the tighter you run the belt tension, the quieter the belt noise is. This may not be true with other belt styles, but it's been self proven to me on the two cars I've messed with.
"use it 'till it breaks, replace as needed"
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