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Re: question for guys running 2-4 edelbrocks [Re: Sammy] #2684645
08/05/19 11:44 AM
08/05/19 11:44 AM
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Bend,OR USA
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Originally Posted by Sammy
Originally Posted by dvw
Area is area. That being said NO WAY square jet. Secondarys are rich enough at the factory setting or very close to it.
Doug



You are wrong. Unless you own a data logger with 8 O2 Sensors, or go on a dyno with 8 sensors, you will never know.
If you owned a racepak with 8 O2 Sensors you would see where to jet it.
Primaries run #1,2,5,6 cylinders
Secondaries run #3,4,7,8
My little small block with a sheetmetal intake was pretty close to square jetting.
If your intake manifold is semi even in distribution, you will see slight variances in jetting from front to back.
Maybe the secondaries could possibly be 3 jet sizes leaner.
I agree with Doug, you've mess up your carbs to make them run better with the same size jets front and rear tsk work
Most people on here don't know that the Carter jets are in .003 bigger or smaller increments, not .001 increments tsk I'm not sure about Eddy jets though confused
Any Carter type carb with metering rods will always need a smaller jet in the rear than the front due to the rod closing up the front jet if the carb flows the same amount of air through the front and rear barrels work shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: question for guys running 2-4 edelbrocks [Re: second 70] #2684741
08/05/19 04:46 PM
08/05/19 04:46 PM
Joined: Oct 2007
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New York
polyspheric Offline
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if the carb flows the same amount of air through the front and rear barrels
This^
It won't unless both the throttle discs and venturis match - that's only a few models, and not available in all sizes.

Primaries run #1,2,5,6 cylinders
Secondaries run #3,4,7,8

???
Is this a:
1. 360° manifold (some Offy and old Weiand)
2. divided 360° (Chrysler factory iron 2 X 4 including 350, 361, 383, 413, all Gen-1 hemi and poly)
3. 180° dual plane


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Re: question for guys running 2-4 edelbrocks [Re: polyspheric] #2684754
08/05/19 05:24 PM
08/05/19 05:24 PM
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central il.
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second 70 Offline OP
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Ok after getting advise from Doug member dvw the tune is very close. This is a Stage V dual 4 manifold. Front carb feeds 1234 and rear feeds 5678.

I ended up with .092 primary .086 secondary .070 x .057 rod. That makes the cruise area .0028 power .0041 and the 86 jet area is .0058.

Many possible combinations I used the rods and jets I had.

Here's a look at the manifold. Just a small equalization port between the 2.

Thanks again Doug for your time and knowledge.

AEE5A75F-287E-40E6-A15B-E9E31D609C16.jpg9BD7C6A9-C82C-4C70-A26D-19E8FEC92945.jpg73A9AA6E-2B23-4971-B5EE-B6458E7DF904.jpg
Re: question for guys running 2-4 edelbrocks [Re: second 70] #2684784
08/05/19 08:34 PM
08/05/19 08:34 PM
Joined: Oct 2007
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New York
polyspheric Offline
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New York
The connection may not have enough X-section to flow a great deal (and not enough to be useful as a plenum) but it equalizes vacuum changes very rapidly.


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Re: question for guys running 2-4 edelbrocks [Re: second 70] #2684791
08/05/19 09:12 PM
08/05/19 09:12 PM
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NE Ohio
DoubleD Offline
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Originally Posted by second 70
Ok after getting advise from Doug member dvw the tune is very close. This is a Stage V dual 4 manifold. Front carb feeds 1234 and rear feeds 5678.

I ended up with .092 primary .086 secondary .070 x .057 rod. That makes the cruise area .0028 power .0041 and the 86 jet area is .0058.

Many possible combinations I used the rods and jets I had.

Here's a look at the manifold. Just a small equalization port between the 2.

Thanks again Doug for your time and knowledge.


That pretty close to where mine was at on the dyno with the same intake and two 800's - I run one step up from that at the track - if I go two steps its way too rich

Re: question for guys running 2-4 edelbrocks [Re: second 70] #2684825
08/05/19 11:33 PM
08/05/19 11:33 PM
Joined: Aug 2003
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Bend,OR USA
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Hopefully your running both carbs together(1x1) and not hooked up for progressive stock type use?
I used the same intake for a EFI 572 Hemi motor I built for a local customer three years ago, it has 1 to1 linkage on the 4150 dry throttle bodies on it also up
You do need to be a little careful while getting use to that type linkage set up, don't bend it up (the car work) due to the better power response work twocents

Last edited by Cab_Burge; 08/06/19 03:45 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: question for guys running 2-4 edelbrocks [Re: Cab_Burge] #2684949
08/06/19 12:30 PM
08/06/19 12:30 PM
Joined: Feb 2014
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central il.
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second 70 Offline OP
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Yes Cab 1 to 1

Double D thanks for sharing your results.

Mike

Last edited by second 70; 08/06/19 09:10 PM.
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