 Shorter Velocity Stacks on bigger Carbs?, what does this do? |
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| Mike D. |
 Mar 21 2007, 02:17 PM
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#1
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OK, It runs now, and pretty good too!  Group: Members Posts: 1,455 Joined: 3-January 03 From: Santa Clarita, Ca Member No.: 85 Region Association: None 
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I noticed that that air filters on the 46mm carbs for the 3.0 are shorter that the ones I had on the 40mm carbs on the 2.0. While investigating I also found that the velocity stacks are shorter. What, if anything does this do? should I look into replacing them with taller ones?
 another shot, don't have pic of the other for comparison...  |
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| r_towle |
Mar 21 2007, 02:30 PM
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#2
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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It all depends on the VE of the motor.
Overall, taller stacks = more low end torque Shorter = more HP in the higher rev range. Again...this depends alot on the Volumetric Efficiency of your motor, the cam, the heads, blah blah blah... So, I would suggest that you dont change them if they came with the motor. Rich |
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| Phoenix-MN |
Mar 21 2007, 02:32 PM
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#3
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Senior Member Group: Members Posts: 927 Joined: 23-January 04 From: ST. Bonifacius,MN Member No.: 1,590 |
I think the shorter stacks and filters were made for 911's with A/C. It may not make much of a difference if you are using them on a street engine.
Others chime in if I have it wrong (IMG:style_emoticons/default/smile.gif) Paul |
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| drgchapman |
Mar 21 2007, 02:35 PM
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#4
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Current Stable Group: NoClassifiedAccess Posts: 922 Joined: 20-September 04 From: Portland, OR Member No.: 2,789 Region Association: Pacific Northwest |
Jake Raby did the definitive study on this issue a couple of years ago. Check the archives.
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