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Old 10-26-2004, 12:57 AM   #1 (permalink)
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carb spacer, open or 4 hole?

What are the advantages of the two types of carb spacer, the open plenum versus the ones with the 4 holes? Is one designed to help in the low end?
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Old 10-26-2004, 09:03 AM   #2 (permalink)
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carb spacer, open or 4 hole?

A 4 holes spacers help with low end and open helps top end
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Old 10-26-2004, 05:29 PM   #3 (permalink)
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carb spacer, open or 4 hole?

I'm running an open plenum Weiand, with an open spacer and looking to do one of the next mentioned.

*Holley makes a plenum divider that is just a plate that splits the plenum. The top of the plate has 2 tabs that go in slots on the spacer. Looks very easy to make.
*Summit also has 4 hole spacer made of phenolic that has a spiral bore.

Anyone use either of these?
I'm looking for more torque and looking to get rid of that mid-range flutter spot.
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Old 10-26-2004, 06:39 PM   #4 (permalink)
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carb spacer, open or 4 hole?

Quote:
On 2004-10-26 00:57, mattri wrote:
What are the advantages of the two types of carb spacer, the open plenum versus the ones with the 4 holes? Is one designed to help in the low end?
It all depends on the application. A large engine with a small carburetor will benefit from both spacers just the same where as the four hole can help a large carburetor on a small engine. It can get real technical with respect to pulse tuning and intake wavelengths.

What are your engine specifics?

~Ty
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Old 10-26-2004, 07:30 PM   #5 (permalink)
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carb spacer, open or 4 hole?

I've read that you could run both ? The open on the bottom for for more volume and the 4hole on the top for more low end power ? Has any one ever tried this ?
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Old 10-26-2004, 08:53 PM   #6 (permalink)
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carb spacer, open or 4 hole?

TPCRacing, the motor is going in an old Bronco. It is a 300 .040 over, 9.5 compression with an Isky dual pattern cam, .280/.296 .448/.472, Offy C intake, headers and a 500 Edelbrock.
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Old 10-27-2004, 12:56 PM   #7 (permalink)
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carb spacer, open or 4 hole?

Take the engine out...........have it dyno'd. USE each and every spacer that you'd like to use. (most dyno shops have these readily available to try).
Then choose from there.
THEN take it to the track, and do your own test/ntuning and see what REAL world apps do for you.
My .002

EVERY engine/car/setup likes/does something different. Kind of like everything else. No 2 peoples vehicle react the same way to the same mod. Just the way it is.
There are basic thoughts/theories, but until YOU do it to YOUR vehicle, you never know.

I"m off my soapbox now.
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Old 10-27-2004, 05:32 PM   #8 (permalink)
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carb spacer, open or 4 hole?

Quote:
On 2004-10-27 12:56, drag79stang wrote:


EVERY engine/car/setup likes/does something different. Kind of like everything else. No 2 peoples vehicle react the same way to the same mod. Just the way it is.
There are basic thoughts/theories, but until YOU do it to YOUR vehicle, you never know.

and you hit the nail right on the head, but for bench racing's sake this guys set-up should show gains with a riser of at least 1". How much and where in the RPM band is to be said, but I will bet a case of beer there are gains in his set-up.

~Ty
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Old 10-29-2004, 12:08 AM   #9 (permalink)
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carb spacer, open or 4 hole?

Thanks for the replies. I decided on a 1" open spacer, it's mostly for clearance, just curious about the two different types.
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Old 10-29-2004, 10:01 AM   #10 (permalink)
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carb spacer, open or 4 hole?

You running this truck in the high revs? Personally I'd stick with the 4 hole for more accurate vacuum signal to the venturi for better throttle response and low end gains.

$.02


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