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  #481  
Old 12-01-2014, 11:15 AM
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Stan Weiss Stan Weiss is offline
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Carburetors do not maintain a constant fuel-air ratio with changes in atmospheric density, but meters the fuel in proportion to the square root of the air density, whereby richness of mixture is increased unless compensating devices of some mechanical nature are applied in an attempt to maintain constancy of the mixture.

The carburetor works on Bernoulli's principle: the faster air moves, the lower its static pressure, and the higher its dynamic pressure. The throttle (accelerator) linkage does not directly control the flow of liquid fuel. Instead, it actuates carburetor mechanisms which meter the flow of air being pulled into the engine. The speed of this flow, and therefore its pressure, determines the amount of fuel drawn into the airstream.

Varying air velocity in the Carburetor Venturi alters the fuel flow to the venturi nozzle or "Booster".

So no, a carburetor cannot compensate for a change of mass flow thru it.

Boosted Engine carburetors basically have a "Power Circuit" that when activated sends
lots of extra fuel thru the carburetor when the engines sees a positive pressure in the manifold. The carburetor becomes an on-off switch adding lots of extra fuel when the engine sees boost.

Tom V.

A scoop might get you 1 psi of Boost pressure but you would have to use power valves to switch on that extra fuel when it saw that positive pressure and NA Dominator Race carbs do not use Power Valves.
Tom,
Than how does Braswell and some of the other Carburetor companies do it on say the NHRA 500 ci N/A Pro Stockers? That would be the 64 thousand dollar question.

Stan

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  #482  
Old 12-01-2014, 11:29 AM
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Looks Good Jack!! Look forward to seeing big red run at Capitol next season!!

Pontiac Power!!

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  #483  
Old 12-01-2014, 12:51 PM
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Just to add to this I believe the that it can be controlled to some degree by the emulsion jets and there size and location in the stack ie: the fuel curve. as the fuel level in the bowl changes due to use and acceleration the effect of the emulsion jets at different float levels will compensate to some degree. Just my 2 cents worth. Also remember that the "pressure" in the scoop is being applied to the inside of the float bowl also via the bowl vent, contributing to the calibration issues at hand.

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  #484  
Old 12-01-2014, 03:58 PM
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Just to add to this I believe the that it can be controlled to some degree by the emulsion jets and there size and location in the stack ie: the fuel curve. as the fuel level in the bowl changes due to use and acceleration the effect of the emulsion jets at different float levels will compensate to some degree. Just my 2 cents worth. Also remember that the "pressure" in the scoop is being applied to the inside of the float bowl also via the bowl vent, contributing to the calibration issues at hand.
There is truth in that statement, and there is a lot of "carb magic" in a set of very large Braswell type split dominators.

The Scoop vs carb calibration issue will be there, just some know how to compensate for it. I have worked on carbs that has 10 emulsion holes per carb barrel and multiple main circuits per barrel.

Tom V.

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  #485  
Old 01-05-2015, 05:51 PM
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ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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  #486  
Old 01-05-2015, 07:24 PM
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I agree 100%


GTO George

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  #487  
Old 01-05-2015, 09:19 PM
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Tom,
Than how does Braswell and some of the other Carburetor companies do it on say the NHRA 500 ci N/A Pro Stockers? That would be the 64 thousand dollar question.

Stan
David Braswell, is an excellent carb Tuner, Innovator, and Manufacturer of carbs.

Little known fact, David's dad campaigned a Pontiac powered Rail for many years and was a very pleasant man to talk to about pontiacs in general 9over the years).

I know how he does it, Chuck Gulledge knew how to do it, You will never see me post Braswell carb info (related to his calibrations).

Tom V.

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  #488  
Old 01-05-2015, 09:59 PM
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Nice!

LOL

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  #489  
Old 01-17-2015, 02:19 AM
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Good god is this thing done yet?

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  #490  
Old 01-17-2015, 09:03 AM
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Good god is this thing done yet?
Motor is done, running and in the car. I saw you painted your car so I'm going to paint mine too

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  #491  
Old 01-17-2015, 09:27 AM
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Motor is done, running and in the car. I saw you painted your car so I'm going to paint mine too
I believe his car has a vinyl wrap, not paint.

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  #492  
Old 01-17-2015, 10:58 AM
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Good god is this thing done yet?


LOL,,,, that was worth an early morning chuckle!

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  #493  
Old 01-17-2015, 04:32 PM
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Justin is entertaining (whether it be on his show or on PY), LOL!

Tom V.

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  #494  
Old 01-22-2015, 09:14 PM
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Mine ain't no wrap! Paint baby!

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  #495  
Old 01-22-2015, 09:18 PM
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Mine ain't no wrap! Paint baby!
and it looks good too!

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  #496  
Old 01-22-2015, 09:39 PM
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Mine ain't no wrap! Paint baby!
Very cool! Sorry I misinformed. It looks great but now doesn't match the Crow shirts I bought my sons.

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  #497  
Old 01-22-2015, 09:44 PM
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Very cool! Sorry I misinformed. It looks great but now doesn't match the Crow shirts I bought my sons.
You will just have to buy the "new" crow shirt!

That's just smart business right there

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  #498  
Old 01-22-2015, 09:50 PM
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White Owl

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  #499  
Old 01-22-2015, 10:38 PM
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The "DOVE" ?

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  #500  
Old 01-22-2015, 11:29 PM
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Good god is this thing done yet?
Hate to see Lil Jack, skull drag and donkey stump that new paint job, LOL

Hey what's in that pimp juice, I have a 3rd place position to defend at BIR in the Aussie outlaw street drags in August.

Last edited by v869tr6; 01-22-2015 at 11:44 PM.
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