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Posted: Wed Oct 31, 2007 9:36 pm 
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JT wrote:
Thanks! so 302 x 6500 /3456 = 567

so a holley 600 vs would be about right then eh?


You then factor in the ve% as the last part of the equation.
Aprox 80% for a street engine is the norm so technically the correct size carb for the 302 is 453.6 cfm.
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Posted: Wed Oct 31, 2007 10:00 pm 
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viper1431 wrote:
JT wrote:
Thanks! so 302 x 6500 /3456 = 567

so a holley 600 vs would be about right then eh?


You then factor in the ve% as the last part of the equation.
Aprox 80% for a street engine is the norm so technically the correct size carb for the 302 is 453.6 cfm.


Many, many years ago I was lead to believe that the Internal Combustion Engine doesn't work in therory, so how does one explain Chrysler using triple down throat carbs on 318's, 360's, 426's and 440's??? What about Chrysler Australia using triple side draught Webers DCOE 45's on a 4.5 lt 6 cyl engine???? How much CFM would that be. Then some Mopar boys in Melbourne were using 52mm Del'orto carbs ( like Webers ) on a 265 Hemi, and went harder than using 45mm ones?????????
Think outside the box for new ideas, maybe better results.

 

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Posted: Wed Oct 31, 2007 10:05 pm 
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if all you want to do is run it for a while,
i still say go the 1850 600 vac, new or reco doesn't mater. so long as it's not a factory reco. (pot luck with what you end up with)

you should be able to find some one to cheaply check the AFR. I do it at work for $85 to put a wideband up the tail pipe. It's not perfect or the best way to do it but it puts you in the ball park. which is all you're looking for realy

 

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Posted: Wed Oct 31, 2007 10:23 pm 
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JT wrote:
and wideband 02 is about $600 here in NZ..you got a good deal!


Theres a complete kit including guage on e-bay for around $400 inc postage.
I used the same kit, which was sourced through the states and got it for around $360 to my door. They are a very nice piece of gear aswell.

http://search.ebay.com.au/search/search ... category0=

 

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Posted: Wed Oct 31, 2007 10:26 pm 
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cjh wrote:
viper1431 wrote:
JT wrote:
Thanks! so 302 x 6500 /3456 = 567

so a holley 600 vs would be about right then eh?


You then factor in the ve% as the last part of the equation.
Aprox 80% for a street engine is the norm so technically the correct size carb for the 302 is 453.6 cfm.


Many, many years ago I was lead to believe that the Internal Combustion Engine doesn't work in therory, so how does one explain Chrysler using triple down throat carbs on 318's, 360's, 426's and 440's??? What about Chrysler Australia using triple side draught Webers DCOE 45's on a 4.5 lt 6 cyl engine???? How much CFM would that be. Then some Mopar boys in Melbourne were using 52mm Del'orto carbs ( like Webers ) on a 265 Hemi, and went harder than using 45mm ones?????????
Think outside the box for new ideas, maybe better results.



because one throat per cyl is not the same as the flow from three webers feeding every cyl.

A 4.5L engine can easy use the flow from triple webers set up like that. you have .75L drawing on each throat. thats more then a 2L on twin webers (.5L drawing on each throat)

and it's not as simple just saying it's a 52mm weber/delorto/solex as they have replaceable venturis, you could have a 45mm carb with a 40mm venturi or a 52mm carb with a 40mm venturi.
you set the venturi size to suit the engine.

over carburating engines is not a new idea or a good idea

 

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Posted: Wed Oct 31, 2007 10:44 pm 
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What is the CFM of the original Carter Thermoquad carby for a 302 or 351???? Is it bigger than a 600 Holley????

 

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Posted: Wed Oct 31, 2007 10:46 pm 
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What about getting 1000CFM throttle body for the 5.0 Windsor???. I know its only air, but you gotta have the fuel to go with it.

 

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Posted: Wed Oct 31, 2007 11:04 pm 
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cjh wrote:
What is the CFM of the original Carter Thermoquad carby for a 302 or 351???? Is it bigger than a 600 Holley????



thermoquads came in about 750 iirc

see, not a new idea, and still not a good one

 

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Posted: Wed Oct 31, 2007 11:08 pm 
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cjh wrote:
What about getting 1000CFM throttle body for the 5.0 Windsor???. I know its only air, but you gotta have the fuel to go with it.



you can get away with it because with EFI you're not using the venturi effect to draw feul. over big carb has poor air speed and mixture quality.


any way this isn't the point of the thread so how about we just leave it alone.

 

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Posted: Wed Oct 31, 2007 11:10 pm 
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tickford_6 wrote:
cjh wrote:
What about getting 1000CFM throttle body for the 5.0 Windsor???. I know its only air, but you gotta have the fuel to go with it.



you can get away with it because with EFI you're not using the venturi effect to draw feul. over big carb has poor air speed and mixture quality.


any way this isn't the point of the thread so how about we just leave it alone.


Fine......I was just warming up too...............lol

 

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Posted: Thu Nov 01, 2007 10:10 am 
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tickford_6 wrote:
you can get away with it because with EFI you're not using the venturi effect to draw feul. over big carb has poor air speed and mixture quality.
.


Thats why I'm gonna use this 900cfm TBi, because it's injected it will work fine.

I'd like to think my VE would be reasonable with aftermarket heads and port matched air gap intake and extractors and raised comp.. maybe 90% or something?

in any case, sounds like the 600 is the go to get it all running. Just don't want to overfuel and wash the bores thats the main thing. I'll be looking foward to getting the EFi on it so I can control whats going on.. I don't know much about carbs

 

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Posted: Thu Nov 01, 2007 2:44 pm 
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cjh wrote:
What is the CFM of the original Carter Thermoquad carby for a 302 or 351???? Is it bigger than a 600 Holley????


800cfm.
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Posted: Thu Nov 01, 2007 9:47 pm 
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JT wrote:
tickford_6 wrote:
you can get away with it because with EFI you're not using the venturi effect to draw feul. over big carb has poor air speed and mixture quality.
.


Thats why I'm gonna use this 900cfm TBi, because it's injected it will work fine.

I'd like to think my VE would be reasonable with aftermarket heads and port matched air gap intake and extractors and raised comp.. maybe 90% or something?

in any case, sounds like the 600 is the go to get it all running. Just don't want to overfuel and wash the bores thats the main thing. I'll be looking foward to getting the EFi on it so I can control whats going on.. I don't know much about carbs


can you borrow an AFR meter?
i wouldn't trust factory jetting on a fresh worked engine

 

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Posted: Fri Nov 02, 2007 1:16 pm 
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I've got a A/R gauge in the cabin..

by the way, what sort of fuel pump do I need with a carb? I know it will be high flow low pressure but some spec? I've got an new electric pump that flows 30GPH and 5-9psi will that do?

 

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Posted: Fri Nov 02, 2007 9:53 pm 
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JT wrote:
I've got a A/R gauge in the cabin..

by the way, what sort of fuel pump do I need with a carb? I know it will be high flow low pressure but some spec? I've got an new electric pump that flows 30GPH and 5-9psi will that do?



Yeah, that'll work. Have you got a way that the pump only works on "crank" and " key on "???

 

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