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Old 03-31-2019, 01:31 PM   #1
vancelot69
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best carb for off road?

Sorry if this has been posted before. When searching, I only saw one thread related, but he was asking which of the carbs he had was best. I would like to know which carb currently on the market (read: new) is best for off roading. I saw the 4-wheeler article from 2001 that said the Q-jet style is the best, but I have heard you can't get them new anymore. A co-worker suggested Holley Truck Avenger, and when I Google "off road carburetor" one of the links is to Summit Racing Edelbrock Thunder series AVS Off-Road carburetors. I have thought about fuel injection, but I don't have a grand to pop for that right now, plus the metal work to get the O2 sensors on the exhaust, so I'm trying to keep it on the cheap, even though a $500 carb isn't really cheap - may as well save up another $500 and get the injection kit at that point...

Anyway, any thoughts appreciated.

Thanks!
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Old 04-01-2019, 09:38 AM   #2
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Re: best carb for off road?

Nothing has changed. The Qjet is better off road in technical rock crawling and easy starting. Cliff Ruggles can sell you a rebuilt carb that is better than new. Lars (I forget his last name) can also sell very nice Qjets. Square bore carbs with the bigger primaries are peppier off idle and not so docile over the rough terrain.
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Old 04-01-2019, 10:45 PM   #3
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Re: best carb for off road?

The pool of good cores isn't going to last forever, that is for sure. The tricky part can be finding a good one.

They aren't voodoo magic to tune or rebuild either!
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Old 04-02-2019, 12:09 AM   #4
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Re: best carb for off road?

Q-jet. The truck avenger isn't close, but it's better than the Edelbrock equipped with the off road stuff.

They are out there. It's that or go to a TBI style injection system. I wheeled a lot with my worn out 350/q-jet and it never failed me. Didn't matter the altitude or position pointed up or down, side hill or not. It always ran, never stumbled. Only things I would do to compensate for the extreme altitude where I was (8,000-13,000 ft) was bump the timing a little and give the carb a little faster idle. I wouldn't mess with the mixture. So it ran a little fat at altitude due to the lack of air, but it also meant it was one less thing to change back when I got home to the lower altitude.

I've seen the light and gone EFI with my LS swap though. Which makes the thought of going back to carb on anything off road much much less probable.
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Old 04-02-2019, 12:24 AM   #5
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Re: best carb for off road?

Like everyone else mentioned q-jet ive been told is about the best. Holley truck avengers ive been told work alright. Regular holleys dont work worth a crap offroad from past experience. Ran a edelbrock 600cfm with a offroad spring kit i believe it was called in it and it wasnt too bad. It would leak fuel out of the passenger side throttle shaft if parked or sat on a hill too long.
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Old 04-02-2019, 01:46 AM   #6
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Re: best carb for off road?

Thanks for the replies, it is very helpful!

I searched for Cliff Ruggles on the forum and checked out this link http://67-72chevytrucks.com/vboard/s...d.php?t=538328. Then I Googled him and found this page that looks like his https://cliffshighperformance.com/ but without perusing the entire site, it looks like he rebuilds carbs you (I) send, and I don't have one to send in for rebuilding. So, in the forum link, on reply #7 Beetle linked to a Summit remanufactured q-jet. The part number on that page no longer exists, but it had a link to another page https://www.summitracing.com/tx/part...0216/overview/ that seems to be the same thing. Do you think I would have to do very much tuning to get that to work in an off road application? Or do you think it would be good to go straight out of the box?

Thanks again for the help!
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Old 04-02-2019, 08:21 AM   #7
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Re: best carb for off road?

Save the coin and keep saving until you can spring for the fuel injection. A well tuned carb is tough to beat but EFI is like having a little tiny guy sitting on the intake making adjustments for optimum performance every second.
The overall drivability of EFI is going to be much better than a carb.

On the flip side......EFI introduces electronics and $hit that can break but not be seen. A carb is 100% mechanical so a breakdown deep in the woods is usually much easier to diagnose and fix.
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Old 04-02-2019, 06:42 PM   #8
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Re: best carb for off road?

Quote:
Originally Posted by vancelot69 View Post
Thanks for the replies, it is very helpful!

I searched for Cliff Ruggles on the forum and checked out this link http://67-72chevytrucks.com/vboard/s...d.php?t=538328. Then I Googled him and found this page that looks like his https://cliffshighperformance.com/ but without perusing the entire site, it looks like he rebuilds carbs you (I) send, and I don't have one to send in for rebuilding. So, in the forum link, on reply #7 Beetle linked to a Summit remanufactured q-jet. The part number on that page no longer exists, but it had a link to another page https://www.summitracing.com/tx/part...0216/overview/ that seems to be the same thing. Do you think I would have to do very much tuning to get that to work in an off road application? Or do you think it would be good to go straight out of the box?

Thanks again for the help!
Any reman is still going to need suited to your engine, and it doesn't sound like they re-bush the throttle shaft on those so they still aren't ideal. They do look pretty though!

I'd look around for a good core, and then you can get Cliff's super rebuild kit. You give him your engine specs and he picks your rods, jets and idle air tubes.

If you don't feel comfortable doing that to a Qjet the summit one would probably work OK.
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Old 04-02-2019, 07:31 PM   #9
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Re: best carb for off road?

Check out Mark at www.quadrajetpower.com

He's very reasonable on cost, fast, and a straight-up honest guy. I've got two of his Qjets, both work great.
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Old 04-05-2019, 02:15 PM   #10
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Re: best carb for off road?

I'm running a modified Demon Carb, I have had two Qjets catch fire on me while wheeling. Been running this demon for the last 6 years with ZERO problems.
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Old 04-05-2019, 07:24 PM   #11
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Re: best carb for off road?

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Originally Posted by JustToxic View Post
I'm running a modified Demon Carb, I have had two Qjets catch fire on me while wheeling. Been running this demon for the last 6 years with ZERO problems.
Interesting, any idea what actually caused the fires? I've been running the oem q-jet (rebuilt a couple times) close to 42 years with no problems.
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Old 04-08-2019, 07:35 AM   #12
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Re: best carb for off road?

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Originally Posted by Stocker View Post
Interesting, any idea what actually caused the fires? I've been running the oem q-jet (rebuilt a couple times) close to 42 years with no problems.
The guy that built the demon carb said both carbs had float issues, that him and another guy could never get worked out.
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