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travis1488
Samba Member
Joined: July 19, 2005
Posts: 164
Location: Piedmont MO
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 Posted: Thu Feb 04, 2010 11:39 am Post subject: Weber Velocity stack |
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| CB sells some stacks that are 1'' tall. I need some short ones to clear unifilters i have. Will they still serve their purpose being that short? |
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Eric_S
Samba Member
Joined: August 12, 2007
Posts: 862
Location: Sparks (think Reno) NV
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| Posted: Fri Feb 05, 2010 2:34 am Post subject: |
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Velocity stacks serve a couple purposes.
1. Funnel the air in. The air no longer has to turn a 90° corner which costs energy that could otherwise be used to draw in more fuel/air.
2. Contain fuel stand-off. The bigger the cam the more valve overlap and therefore the more stand-off. That's why you see the BIG stacks on the drag racers with the 51.5 IDA's.
So, you know your combo. Would you benefit? You would at least from point #1.
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Eric_S
What are all these extra parts? |
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chambersc
Samba Member
Joined: April 08, 2007
Posts: 349
Location: Enid, OK
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| Posted: Fri Feb 05, 2010 5:20 am Post subject: |
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I don't mean to Bogart your post here, but I am installing a set of original height velocity stacks on my 44IDF's right now and the damned studs aren't tall enough for the filter base plate and velocity stacks from CB Performance. Anyone else ever ran into this? I'm having to file down the base of my stacks in order to make them clear. Kind of frustrating on brand new parts to mess them up like that.
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travis1488
Samba Member
Joined: July 19, 2005
Posts: 164
Location: Piedmont MO
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| Posted: Fri Feb 05, 2010 6:22 am Post subject: |
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| I had to back the studs out of the carb so they would be long enough. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20829
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Fri Feb 05, 2010 6:57 am Post subject: |
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| chambersc wrote: |
| I don't mean to Bogart your post here, but I am installing a set of original height velocity stacks on my 44IDF's right now and the damned studs aren't tall enough for the filter base plate and velocity stacks from CB Performance. Anyone else ever ran into this? I'm having to file down the base of my stacks in order to make them clear. Kind of frustrating on brand new parts to mess them up like that. |
Get longer studs....
http://www.nutsandbolts.com/stud-index-metric-sae-uss-metric-studs-c-30_131_132.html
OR some similar place...
Dale
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nextgen
Samba Member
Joined: August 19, 2004
Posts: 6149
Location: CONGERS, N.Y.
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| Posted: Fri Feb 05, 2010 7:10 am Post subject: |
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Velocity stacks are not there to look pretty. If you have two engines drawing exactly the same amount of air, by changing the stacks height and shape you can increase the speed at which the air enters the carbs. Thus having a different effect on each engine. Short is usually good for quick response, tall are more for long runs at higher speeds which usually give better mileage.
The air at the mouth of the stack is compressed as it gets to the restricted area and picks up Velocity as it enters the carb. Without the stacks the air would be in chaos at the top of the carb.
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