to Carb or not to Carb??
#4
Race Director
#7
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St. Jude Donor '05
Carbs have come a long ways and are pretty reliable. However if you already have EFI work the bugs out and keep it on there, many benefits to it youll never get with a carb. (coming from a die hard double pump fan)
#8
Race Director
Mine is coming from a carburetor remanufacturer of 25+ years
#9
Cruising
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In my opinion, if it isn't broke, don't fix it
While the carb does have benefits over EFI, the opposite holds true. You will never get quite the same power from a carb as you will from injection, but it is easier to tune (IMO) and you can get it fairly close - but still behind - not to mention that a carb and air cleaner look sexier
EFI, however, actually manages the fuel and requires little to no tuning. It also won't have trouble with cold starts, but you don't get that classic muscle look under the hood.
I suppose it comes down to preference and what you intend to use it for. I can tell you, however, that putting a carb on will require time and (possibly) a fair amount of modification. With a carb, you will have to strip the vehicle of most modern electronics (computer included) which leads to installing manual gauges as well, unless you can reprogram the control module. Depending on the total height of your carb and air cleaner, you may also have to cut and resculpt the hood (or buy a new one.)
While the carb does have benefits over EFI, the opposite holds true. You will never get quite the same power from a carb as you will from injection, but it is easier to tune (IMO) and you can get it fairly close - but still behind - not to mention that a carb and air cleaner look sexier
EFI, however, actually manages the fuel and requires little to no tuning. It also won't have trouble with cold starts, but you don't get that classic muscle look under the hood.
I suppose it comes down to preference and what you intend to use it for. I can tell you, however, that putting a carb on will require time and (possibly) a fair amount of modification. With a carb, you will have to strip the vehicle of most modern electronics (computer included) which leads to installing manual gauges as well, unless you can reprogram the control module. Depending on the total height of your carb and air cleaner, you may also have to cut and resculpt the hood (or buy a new one.)
#10
Corvette Junkie
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carbs
Good Luck. If you want to understand your FI better, here is a good read to understand your FI.
Corvette Mike
#11
Le Mans Master
Doesn't look like there are to many carb fans here. Put me down for (Stay with fuel injection) , why go back to old technology?....WW
#12
Le Mans Master
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However I think it is justified if you have a basket case car that requires expensive major work to the EFI system ,rewiring , sensors , etc;
in which case a carb is a quick fix to get you on the road and having some fun
If you are talking pure power output , carbs come into their own at WOT. It is the inbetween metering where EFI gives much better control.
You leave the ECM and wiring in place to run the gauges / speedo ; all you lose is the fuel range / mpg function.
You can even leave the EFI harness tucked away down on the bellhousing so you can go back to EFI when you want .The only thing you have to change is the dist to a non computer controlled one.
Last edited by rodj; 08-22-2009 at 10:02 AM.
#13
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However I think it is justified if you have a basket case car that requires expensive major work to the EFI system ,rewiring , sensors , etc;
in which case a carb is a quick fix to get you on the road and having some fun
Lingenfelter did back to back tests and found there was little difference in either if correctly tuned.
If you are talking pure power output , carbs come into their own at WOT. It is the inbetween metering where EFI gives much better control.
BS.
You leave the ECM and wiring in place to run the gauges / speedo ; all you lose is the fuel range / mpg function.
You can even leave the EFI harness tucked away down on the bellhousing so you can go back to EFI when you want .The only thing you have to change is the dist to a non computer controlled one.
#14
Race Director
I carbed and went to a tpi Superam setup. The problem I had with carburation was that the underhood temps of the C4 were so hot after shutdown that fuel would perculate out of the fuel bowls, down the venturis and into the motor. Not good for rings. I even cut ducts in the hood, removed the upper fenderwells and it still didn't help.
#15
If you go to carb I also suggest:
1. Removing the alternator and going to a 6 volt generator with an electromechanical voltage regulator
2. Install a crank start (drilling the hole through the radiator is tricky)
3. Remove power steering pump and go with Armstrong Steering.
4. Fab up a manual drum brake system to replace power disks
5. Ditch power windows and go with cranks
6. Replace electric windshield wipers with a vacuum system
7. Find a tranny with unsynchronized straight cut gears (I suggest a 3 speed)
8. Revert to an AM only radio
9. Reengineer an oil bath type air cleaner to fit under hood
10. Ditch the oil filter system (the first SBC engines didn't use them)
There are a few more things, but that would get you well on your way.
1. Removing the alternator and going to a 6 volt generator with an electromechanical voltage regulator
2. Install a crank start (drilling the hole through the radiator is tricky)
3. Remove power steering pump and go with Armstrong Steering.
4. Fab up a manual drum brake system to replace power disks
5. Ditch power windows and go with cranks
6. Replace electric windshield wipers with a vacuum system
7. Find a tranny with unsynchronized straight cut gears (I suggest a 3 speed)
8. Revert to an AM only radio
9. Reengineer an oil bath type air cleaner to fit under hood
10. Ditch the oil filter system (the first SBC engines didn't use them)
There are a few more things, but that would get you well on your way.
#18
Melting Slicks
you can have a harness tested and repaired for a reasonable price.. its not rocket science. i have taken literally nothing from my car aside from changing the exhaust and swapping motors.. it still retains every option and is still plenty fast and as nice to be in as the day i bought it with all things functioning the way it should. i did everything i could keep it as close to stock appearing as possible. in no instance did i need to reinvent the wheel to make something work.. there are plenty of cars on here that are older then mine that probably look twice as nice and put out comparible numbers. switching to a carb makes no sense whatsoever. if you have that many problems with it you might as well take it to someone that has the ability to fix it for you or sell it and spend the money on a nicer car that doesn't have any problems.
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St. Jude Donor '05
#20
Drifting
You have a good memory and a keen eye! Yes, new AFR 215 heads. Went to a much more aggressive solid roller cam, shaft mounted rockers, bigger badder carb, 3 inch exhaust, 7 quart oil pan, new dewitt rad..... etc.