Re: Millage carb?
[Re: Supercuda]
#157850
11/27/08 09:55 PM
11/27/08 09:55 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
1st choice(by far) 600 eddie 2nd choice 600 vac holley but go with either a reworked one, one of the aftermarket clones of it, a complete carb or maybe a Proform main body which gets good reviews maybe aftermarket metering blocks.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Millage carb?
[Re: mod5v]
#157854
11/28/08 01:18 AM
11/28/08 01:18 AM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
I'd find a used 600 eddie put a kit in it & I think you'd be happy with that & not out too much money.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Millage carb?
[Re: RapidRobert]
#157855
11/28/08 02:47 AM
11/28/08 02:47 AM
|
Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
|
master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
|
I disagree that a square bore carb can't do as well as a spread. I've tuned a 625 road demon on my 440 winni. The 440 is original, well worn, and burns some oil. I get 8 mpg (us gallon) and 10mpg Cdn gallon towing my car over some of the highest mountain passes in the world. Car's 3800pounds, plus the 18 ft trailer, the tools, and of course the winni with the gear and the family in it, which I'm scared to even guess at the weight on. It get's better milleage than any gas tow rig I've ever owned. TQ or otherwise. But back to the build.... I agree that the dp is going to hurt mileage, BUT it should only be a factor when your romping on it. In the primary's it shouldn't matter. I notice no cam specs. A 340 was a performance motor, so it wants to perform. Not economize. IMHO I think the 13 mpusg you are getting isn't too far off of anything you can hope for. If there is something wrong with the holley then you may see some improvement. A smaller carb (not smaller jets) may improve velocity, and fuel atomization, so if you can find something smaller (regardless of brand) you may see an improvement there also. Put a vacuum gauge on it, and watch it while you drive. Your driving habits may adjust a bit and help you too. It's very difficult to build an old motor to perform, and then get mileage out of it.
|
|
|
Re: Millage carb?
[Re: dave571]
#157857
11/28/08 08:56 AM
11/28/08 08:56 AM
|
Joined: Jan 2003
Posts: 9,982 Ansonia, CT
CJK440
master
|
master
Joined: Jan 2003
Posts: 9,982
Ansonia, CT
|
The reason Double Pumpers are not MPG friendly isn't the additional accel pump, because if you are driving for mileage, it should never operate.
Double pumpers have smaller power valve channel restrictors so if you tune for power, cruise will be rich. If you tune for economy, power will be lean.
Opening up the PVCR's will change it but I wouldn't go fooling with it without a good way to check air fuel ratio.
2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
|
|
|
Re: Millage carb?
[Re: mod5v]
#157859
11/28/08 11:42 AM
11/28/08 11:42 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
For mileage I like the TQ best followed by the Carter AVS.
Sheldon
|
|
|
Re: Millage carb?
[Re: mod5v]
#157860
11/28/08 01:32 PM
11/28/08 01:32 PM
|
Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
|
Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
|
It is not a carb but if what you desire is better fuel economy and also the ability to get best power a TBI or MPSFI setup could do up to 30% better. If you are on a limited budget factory EFI units pulled from a junkyard (Chrysler, GM or Ford units all could work) would give acceptable results I would also urge not neglecting the easy Highway MPG gains that can come from aerodynamics or easier rolling resistance tires It is hard to improve engine efficiency but this article does show that improvements have been made with operating near the limit of lean air/fuel including much research by Chrysler: http://www.designnews.com/article/9710-Thirty_Year_Quest_for_Lean_Burn.phpit is doable to get your Duster over 20 MPG without breaking the bank
|
|
|
Re: Millage carb?
[Re: mod5v]
#157864
11/28/08 05:20 PM
11/28/08 05:20 PM
|
Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
master
|
master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
|
Put on a 600 Holley vac secondary.It will work fine.I ran a 318 with 340 cam and same gearing as your car and got 22mpg.Mine was jetted at 64pri,left the stock metering plate in the back.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
|
|
|
Re: Millage carb?
[Re: mod5v]
#157867
11/28/08 10:07 PM
11/28/08 10:07 PM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
If you get an Ebay carb, any carb, you had best budget for a rebuild kit too. This is yet another area the AFB style cab wins out over the Holley, extremely esy to rebuild and Edelbrock has the owner's manual online, so you can verify settings, jets and rods.
If you were closer to me, I live in San Angelo, I could help, but I am sure there is a Mopaters member around you.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
|
|
|
|
|