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#1 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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carb setup input please.
so im trying to decide which carb set up would be best for my truck, its a 292 I6 backed by a sm465 and a 5.13 rear end. im looking at a dual 2bbl carb set up at a total of 450$ estimate. and a 1x4bbl set up at 420-480$ estimate.
i know the 2x2bbl would look the coolest, however which set up would perform best in a 4500lb truck, that's a DD, play and a work truck? would the twin carbs give me trouble towing? also im looking at two carbs for the 4bbl a 500cfm edelbrock @ 255$ and a q jet @ 219$. can a q jet be tuned for a I6 if i remember i read in a book q-jets can be from 350-750cfm and some were on a pontiac I6 (sprint?). can any q-jet be tuned for an inline 6 cfm? or do i have to find a specific casting of q-jet for the smaller cfm of 350-500? would a stock sbc q jet work with a little tuning? thanks everyone and yes i know i need the inline 6 power manual...sigh i forget everytime i drive past the book store...
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1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#2 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: carb setup input please.
I'm a strong proponant of Q-jet's but on an engine that's pulling hard a lot they are not practical. A small Holley or Carter 4 brl. would work best.
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#3 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
why are they not practical? to lean? that may actually work for a inline 6, as they draw less air and fuel then a v8. idk hence why im asking.
any thoughts on a dual carb setup in a working truck? thanks in advance
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1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#4 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: carb setup input please.
The primaries are too small for a truck that is working hard. You are into the secondaries too much. That's why GM didn't put them on the 1 1/2 ton up trucks. They used large 2 barrel or Holley 4 brls.
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#5 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
hmmm that does make sense. will it at least work well until i can afford a holley or such? as people seem to love to toss the q-jets around here. plus im sure the 5.13 gearing will take some of the load off the carb. thank you for your help so far wrenchbender.
__________________
1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#6 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: carb setup input please.
I don't know what manifold you have in mind but the Q-jet's & square bores have different bolt patterns & you will have to modify throttle linkage & fuel inlet tubes to change over. It would not be worth it unless you plan on useing that style carb. I agree Q-jet's are cheap. You can buy them for $5 to $10 at the swap meets. $50 or less in parts & you have a great performing carb.
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#7 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
i plan on an offy intake, with an alum adapter hoping 1/2" thick(having napa make me one 15-20$ ). fuel lines are rusty so im replacing them all so modifying to fit is not a problem, and linkage i figure i have to buy or make no matter the carb i get.
i figure 50$ q-jet 230$ intake(new) 20$ adapter 30$ roll fuel line and fittings 50$ linkage, that makes 380$ where just the 500cfm edelbrock (255$) and intake(230$) is 485$ and i'd still need fuel lines and linkage... by working hard u mean while towing and hauling right, i tow 1-2 times a week roughly 1500-2200lbs, and haul 800-1500lbs 2-3 times week usually these are same days. do u still feel this is too much for a q-jet? what percentage would u feel the mileage would drop? 30-50%? im living with 13mpg now, figure 15-16mpg when 4.11's replace the current 5.13s, so the occasional drop in mpg would be fine plus the 100$ or more i save with the q-jet would give me extra gas money for those days. i'm not saying i don't believe you with the q-jets not being good work carbs, im just trying to use your knowledge to see if the monetary up front savings of using the q-jet would be worth it. my experience with holleys/edelbrocks is not the best. thank you so much for your help so far.
__________________
1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#8 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: carb setup input please.
It's hard to tell without trying. Be sure you have a good exhaust system. The stock exhaust on a 292 gets extremly hot when its working hard. It warps manifolds & burns out gaskets.
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#9 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
i should of mentioned i have clifford shorty headers on it now with dual 2.25in pipes straight back to two 28" thrush glasspacks that exit in front of rear axle.
so i guess i'll give it a shot hopefully i get all the money together soon, at least if the carb don't work out its only 50$ and not 200+$! btw is it the throttle shafts that create a vacumn leak on q-jets as they wear? is their a way to tell if they are worn to that point, from looking at it at the parts yard? i know its fixable just figured i'd try to act smart when i go lol. thanks for all your help.
__________________
1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#10 | |
Registered User
Join Date: Jan 2011
Location: cookeville,tn
Posts: 4
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Re: carb setup input please.
Quote:
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#11 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,605
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Re: carb setup input please.
I put a 350 holley 2 barrel on my Offy. Float bowl towards the valve cover. I lowered the float a quarter inch, bolted it on, set the idle screws at 2 turns, fired it up and haven't touched it in 6 months. Quadrajets are great carbs but too much for your 292. JMHO
If you want the look of a quad but with bigger primaries look for a dueljet. They're a 4 barrel quad with a blanked off secondary but with bigger primaries. I'll post some pics of mine when I get home. Stuck in Hawaii till saturday. POOR Me!!!! |
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#12 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
yeah definitely liking the q-jet idea. my dad was saying too of the hassle of keeping dual carbs tuned/synced?. the dualjet wasn't that on the 301 pontiac v8? or at least thats the one motor i remember them being on. guess i'll see which ones i get my hands on first,
![]() btw went to borders but didn't see any book on quadrajets isn't their a good book out their about working with them? or is my memory fuzzy?
__________________
1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#13 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,605
|
Re: carb setup input please.
Look on Amazon.com for quadrajet books. Dualjet was on some 350's too.
Here's pics of my Holley 350 on my 65 230. |
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#14 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: carb setup input please.
beautiful! thats an offy intake right? i may look at amazon i just hate buying online, as i got no cards have to go load a walmart one when i do online orders lol. but it keeps me debt free.
i may consider a holley if i can get the money or a great deal on one. its just i got to watch my spending i got a little one on the way and id rather spend more on him then my truck. thanks for the pics and advice!
__________________
1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l |
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#15 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,605
|
Re: carb setup input please.
Yup. It's an Offy. Here's some quad links for you.
http://www.florida4x4.com/tech/quadrajet/ http://www.vetteprojects.com/kstyer/quadrajet.htm Last edited by geezer#99; 01-15-2011 at 06:58 PM. |
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