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Discussion Starter · #1 ·
carbs when there set up correctly work, what are your tricks to make them run like injection? i run my float level a little lower than stock(quadrajet), adjusted the stops on the float so it wont move around and regulate the fuel pressure down to 2psi. any other tricks? <IMG SRC="smilies/biggrin.gif" border="0">
 

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I don't think there is a way you can make a carb run "like" fuel injection. I would just install fuel injection and be done with it. You'll never go back to carb.

Charles
 
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Originally posted by NECKSTER:
<STRONG>Buy fuel injection!

<IMG SRC="smilies/thefinger.gif" border="0"></STRONG>
You had to know that was comin', Fullsize <IMG SRC="smilies/laughing.gif" border="0">. I can't comment cause I'm spoiled by FI, but somebody here might post something useful, unlike our 3 responses <IMG SRC="smilies/biggrin.gif" border="0">
 

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Jetting for the altitude you normally run around, but still isn't as good as FI.
 

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I have an Edelbrock on my 302 that works great but nowhere near as good as EFI. I installed the off-road kit, lowered the floats, changed the jetting for the altitude and installed a fuel pressure regulator.
 

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Originally posted by FULLSIZE:
<STRONG>quadrajet <IMG SRC="smilies/biggrin.gif" border="0"></STRONG>
This is important; the Motorcraft 2100 is very good too, but other than those two, every carb I've ever seen sucks off-road, and unfortunately most people then draw the conclusion that EVERY carb sucks offroad, which just isn't so.

I like the foam floats, they have less momentum and don't bounce open easily - changing them before they soak up too much fuel is good too. On the two "good" carbs you can extend the float bowl vent tube(s) several inches, whatever you air cleaner will allow. You can pack them with coarse stainless steel wool to kill splash - pieces of a "chore-boy" kitchen scrubber are good for this. IMO, the problem with the spring-loaded needles is that they're not well damped and are prone to bounce on washboard-type surfaces; I don't use them, haven't seen much benefit. Q-jets have some openings in various places (depending on model) that allow dust, mud, etc. in, and it's good to seal these up with RTV. On 4MV's and similar (70xxxx series) Qjets, the secondary air valve blocking lever will flop back and lock out the secondaries on steep/rough hill climbs; take this off and thow it away, since the only purpose it ever served was to keep you out of the secondaries on a cold engine, and you should have enough sense to be able to handle that one yourself.

I have two EFI rigs and two carbed; a good carb (Qjet or 2100) set up properly will run at any angle rubber will contact something, and long after the oil pump starts to suck air or an automatic trans has run dry. I actually prefer the carb on a trail rig because if anything ever goes wrong it can be fixed with a screwdriver, and a little welding won't blow its mind. EFI does have an edge in fuel economy, and is the only way to go to keep proper stoichiometry going into a three-way cat (which is why you can't buy many new cars/trucks with carbs). If you're carburetor-impaired (flame suit on <IMG SRC="smilies/tongue.gif" border="0"> ) then EFI is certainly the way to go, but don't need to try to tell me that you can't get excellent off-road performance from a good carb.
 

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Best carburator mod I know is to throw it in the trash where it belongs. If you must run a carb for some sentimental reason, then I agree w/the q-jet reccomendation.

Pete
 

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Discussion Starter · #10 ·
carbs will never run like injection, but for all due purposes my carb runs til tires arent on the ground. engine knocking like a bitch, thats good enough for me. for every good example of a fuel injected rig out there, there are two really screwed up, every sensor unpluged, sputtering up the trail rigs. FI is great i'm sure, but you just havent given me any reasons to give up my carb just yet. <IMG SRC="smilies/thefinger.gif" border="0"> thanks for the support Llyod.
 

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reasons to give up a carb:
Better power
more efficient fuel burning $$chaching
hands off tuning <IMG SRC="smilies/biggrin.gif" border="0">
no worries when changing altitudes
easy dianostic checking (just plug it in and see whats wrong)
you do not really need a big holly 950 cfm carm feeding a 700hp motor to crawl, so the need for big carbs is out.
no need for a choke on those cold arss mornings
If you go LT1 TPI you will get rid of your carb and distrib all in one swoop..
Thers a couple reasons I feel are worthy
 

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No one has said anything about running their carb backward. A few in my club run 2 barrels backward and I've been told a q-jet will run at better angles if the carb is reversed. Any input???
 

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I look at fuel injection as a safety issue. While there are some carbs that work very well, IMHO it cannot work as well as fuel injection. The time when you might need fuel injection the most is when you're on your side or pointing nearly straight up. It's is no brainer for me.... I've wheeled with a carb and I'll NEVER go back.
 

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I'm with the rest of the carb guys, a well tuned motorcraft or quad will run anytime you need it. No it won't run on its side (well sometimes but thats just luck) but if your on your side your screwed anyway! yeah they lose a *Little* on fuel economy but I know of at least a few old carbed fullsized getting 15mpg around town, about the same as the good EFI trucks out there.
 

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Originally posted by FULLSIZE:
<STRONG>for every good example of a fuel injected rig out there, there are two really screwed up, every sensor unpluged, sputtering up the trail rigs. <IMG SRC="smilies/thefinger.gif" border="0"> thanks for the support Llyod.</STRONG>
And for every carbed trail rig that runs perfect there are a dozen that run like crap, and plenty more that drive good but will burn your eyes with how rich they run. I've yet to see a carb/independent distributor that can compensate for altitude and climate like an efi setup w/integrated distributor.

Pete
 

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http://www.picturetrail.com/gallery/view?p=999&gid=244468&uid=121550&members=1

This should take you to a pic of, My carb with the bowl vents extended, I had a problem with the carb flooding at angles, also running electric pump w/pressure at4psi carb is weber 40mm.
All pro bumper pics also,Not happy with the bumper most of the holes didn't line up and chris didn't care. <IMG SRC="smilies/flipoff.gif" border="0">
 

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Discussion Starter · #18 ·
thats nice. all of you who posted to go to fuel injection run chevys. i have a 360 dodge so my chioces for fuel injection are aftermarket or swap out my engine for a late model magnum mpi motor, which last time i ran across one was $2500 or more. thats why i say "yet" in my other post. i'm not going to give up my perfectly good running motor just yet. <IMG SRC="smilies/tongue.gif" border="0"> anything on that backwards Q-jet?
 

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There's a guy running ARCA with a beaten old FSJ pickup, 401 and backwards Q-jet; and Lance posted something about one a while back (like maybe a year). I can't figure out what this does. Anyone?
 

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BTT - someone that is running reversed carbs - give us info!!! <IMG SRC="smilies/biggrin.gif" border="0">
 
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