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Old 01-13-2009, 07:39 AM
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Carb spacers?

What exactly are the uses of carb spacers, and do they do anything to affect the way the motor runs?

I figured this was the basics area so this should be asked here.
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Old 01-13-2009, 07:50 AM
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Go to there and read it...
http://speedtalk.com/forum/viewtopic.php?t=14343
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Old 01-13-2009, 08:24 AM
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I was on the dyno with my BBC 402 a few years ago and a carb space picked up about 10 horse power if I remember correctly. I would have to look at the dyno sheets again....but I know it was worth the investment after the dyno.
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Old 01-13-2009, 10:06 AM
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for normal driving it is a TQ rpms curve tuning aid.....

oem's used 2 and 4 hole spacers to help a small motor/heavy car/tall gears combo's accelerate better from a stop without using WOT
(more TQ at less rpms)

any motor has a "ideal" intake runners length at the HP peak rpms,,,a spacer adds length and may help...
(but can cost power at lesser rpms)

test runs at a strip will tell you if it is a good or bad plan...

go find one in a yard for $5? to play with...

here's a spacer article:

http://www.gnetworks.com/v4files/bar...h%20images.pdf
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Old 01-13-2009, 10:30 AM
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4-hole spacers work a little differently and usually lower the RPM range a hair, increase the torque, and knock a little off of top end hp- though it all varries. Sometimes they help sometimes they don't. Sometimes a 2" is great sometimes a 1/2" is better. The worst part is its not much of a science but more of a "try and see" You can buy phenolic spacers cheap though so it may be worth toying around with.
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Old 01-13-2009, 11:51 AM
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Quote:
Originally Posted by Scotto
What exactly are the uses of carb spacers, and do they do anything to affect the way the motor runs?

I figured this was the basics area so this should be asked here.
Spacers are used to alter the fuel atomization quality immediately below the carb i.e. smooth the transition into the plenum, as well as into the runners.

4 hole tapered spacers smooth the output from the carb.

Additional height is used to allow the atomized fuel to make the turn into the runners without the fuel being slammed into the walls or floor of the plenum.
and
to increase the plenum volume.

Open spacers, one big hole, are used not only to increase plenum volume by their thickness, but also to allow one side of a dual plane intake to breathe from the other side, in effect increasing the plenum volume.

Spacers also alter the "chaos" of fuel distribution pattern immediately below the carb as each cylinder alternately sucks and stops.

There is no way of guessing what an engine likes. It is a try and see situation.

On a performance intake I like the 4 hole tapered immediately below the carb to smooth the transition, regardless of what is below it (in most cases)

oversimplified?
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Old 01-13-2009, 12:34 PM
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Thanks everyone, and Scot, no such thing as oversimplified. I was thinking about trying one or two different ones out to see if anything changed overall. That, and I like the look of the cleaner and carb sticking out of the hood.
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