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Old 10-17-2004, 01:26 AM
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tuning with velocity stacks?

has anyone ever tuned with velocity stacks? is there any gain whatsoever? any sites where i can read more on this?

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Old 10-17-2004, 07:13 AM
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Dave- I have a '49 chevy truck: 350/350 with a K&N velocity stack. I don't have any numbers for compareson but the other day I replaced the stack with a brass spittoon (I do these things). I was surprised that the engine stumbled off the line: sputtered and hesitated. Apparently the big bowl of the spittoon created a vacuum and starved the carb for air until it started flowing again. I don't know if that is exactly what happened, that's just my theory. I put the stack back on and it runs great again.

The spittoon gets a lot of attention at car shows but the stack works.

I'll have to post pictures.
Ed
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Old 10-17-2004, 07:20 AM
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http://www.cruzers.com/~twakeman/TR/Net_SUstacks.htm
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Old 10-17-2004, 07:30 AM
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It's amazing what different ventura shapes sizes and configerations can effect the way the eng sucks air at
its happy run mixture,,..
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Old 10-17-2004, 04:59 PM
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The thing that I like about velocity stacks aside from the fact that they look cool and chicks dig 'em is that you can adjust your carb without having to remove the air cleaner.

Here's a picture of the stack and the spittoon.
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Old 11-10-2004, 08:37 PM
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do these help at all? 12th picture http://toyotaperformance.com/intake.htm
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Old 11-10-2004, 08:50 PM
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velocity stacks

Neat looking for sure but a misnomer. What velocity stacks do is to straighten out the air flow going to your carburetor, thereby allowing a smooth consistant flow. And most anything will work as a velocity stack, as long as its about 3-4 inches in height. Refer to the home made ones on my 3 duece setup on my avitar.
It just so happens that those old tobacco cans are a trick from way back and fit perfectly on most any carb with a 5 1/4 inch base for the air filter. Just cut the bottom out and presto. I left the lid ring on the tops as it makes a good seal base for the air filters.
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