carb change
#814998
09/26/10 04:49 PM
09/26/10 04:49 PM
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Joined: Mar 2009
Posts: 583
Raleigh, NC
rockerbob
OP
mopar
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OP
mopar
Joined: Mar 2009
Posts: 583
Raleigh, NC
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Currently have a 600 Eddy on a mild 318. If I went to a Holley 700 or 750 double pumper will I get much of an improvement?
2005 Dakota 4X4 3.7
2004 Rumble Bee 5.7
1978 Diplomat 318
1969 Satellite 318 "bracket racer"
1966 Barracuda (in progress )
1964 Dodge 330 (future race project)
1962 Belvedere (HUM????)
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Re: carb change
[Re: rockerbob]
#814999
09/26/10 09:42 PM
09/26/10 09:42 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm sure the 750dp would be overkill. For WOT if your manifold vac is over 1 in hg you can use a bigger carb as the venturis are the restriction in the inlet path. In your case I'd take the top off the eddy 600 and trim the counterweights on the butterfly assy to make it come in sooner & see if that helps (or hurts) you. That will tell you which way to go. You want to attack the most restricted part of the overall air pump (eng) which is usually the ex
live every 24 hour block of time like it's your last day on earth
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Re: carb change
[Re: rockerbob]
#815005
09/28/10 12:03 AM
09/28/10 12:03 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Quote:
Need to know the rest of the setup.That being said a mild 318 should respond well to a Holley 600 vacuum secondary with the choke flap removed and some secondary spring tuning.
I agree a well tuned thermoquad is the best choice.
Well its a strip only car. I have not done anything to the Eddy. I called a prominent converter co. Was talking to the guy about my combination. He recomended me a convert & said my carb was too small. I have had several guys at the track tell me I should try a 750 Holley. I also talked with a local Mopar guru who also said for a strip only car to try a 750 vac secondary carb. Also have seen 2 post on the race section where guys swaped to a larger (750) carb on a 318 & got nice improvments. So just thought I'd run it on here & see what the opinions where on it.
You will get all kinds of different answers when it comes to picking a carb, so its just hit & miss, i will give you my  , i would'nt go any bigger then a 650dp.
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Re: carb change
[Re: ScottSmith_Harms]
#815008
09/29/10 10:17 AM
09/29/10 10:17 AM
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Joined: Nov 2003
Posts: 1,001
Canada
Ghoste
super stock
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super stock
Joined: Nov 2003
Posts: 1,001
Canada
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Yeah but they have that tiny primary side. The big Holley as you know is a squarebore.
I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
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Re: carb change
[Re: Ghoste]
#815009
09/29/10 10:32 AM
09/29/10 10:32 AM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
Yeah but they have that tiny primary side
That's right, so they work great when the engine has low fuel needs as well as high fuel needs. I'm not saying a TQ is the best choice for ultimate horse power (but in this case it very well could be) what I'm saying is that carb size related to engine size/cubes is not always what it may seem on the surface.
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Re: carb change
[Re: ScottSmith_Harms]
#815010
09/29/10 10:46 AM
09/29/10 10:46 AM
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Joined: Nov 2003
Posts: 1,001
Canada
Ghoste
super stock
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super stock
Joined: Nov 2003
Posts: 1,001
Canada
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Absolutely, and I would never presume to tell you anything about carbs (your reputation speaks for itself). It was just that the last statement about putting lots of 800cfm TQ's on smallblocks could have lead someone into thinking there was no harm in sticking something like the 850 Holley dp on their 273 or something.
Not correcting you, just clarifying for some might be a better way for me to put it?
I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
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