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#1
02-25-2007, 07:52 AM
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Looking at a 74 280
I am looking at a 74 280. It looks good but needs some carb work. Looking at other threads that seems to be the achilles heel on these models. just how troublesome are the carbs on these? With a kit can I expect to be able to rebuild it myself? In the 80s I have rebuilt a few quadrajets with success 50% of the time. If not, is there a good aftermarket replacement?
It is to be a daily driver, not a show piece.
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes 
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#2
02-25-2007, 08:32 AM
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The 4A1 is basically unstable. Chuck Taylor and others have successfully replaced it with a quadrajet. Rebuilding is straight forward. Watch for warped and broken parts.
Chuck used a Holley 4360c carb. (The c is for integral choke). -CTH
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#3
02-25-2007, 09:11 PM
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Quote:
__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes
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#4
02-25-2007, 11:28 PM
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Yeah,if the carb is worn out it can strand you. It can also burn down the car. It can flood the plugs with no warning. It can also run so lean it'll fry the valves.
If it is in good shape they aren't bad carbs. They're just Quadrajets manufactured under an European license. MB got a little too creative with idle compensators and a couple of other features. Generally the problem with them is they have been abused when rebuilt. Instead of using the proper torque settings people just crank the screws tighter. Same problem with the old Quadrajets on American iron. Once they're tweaked, they're tweaked! If they aren't too bad and with the proper amount of patience and care the sealing surfaces can be brought back to a reasonably "flat" surface. I fought mine for three weeks and finally conceded. Too many monkeys using screwdrivers for me to restore. I adapted a Quad, a Motorcraft two barrel, a Carter two barrel (which I've been running for 6 months) and I am in the process of converting over to a TBI using the Megasquirt ECU.
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#5
02-25-2007, 11:57 PM
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Thanks 
__________________
-Randy Wakefield 1969 220D 4 speed (parts car) 1976 280C 1976 280S 1981 240D 4 speed (parts car) 1982 300D 1983 300TD (Ivory) 1983 300TD (gold) 1985 300TD (gray) 1987 190D 2.5 1970 280SEL (sold) 1977 240D 4 speed (sold) 1974 280 (rusted to death) --- 1927 Chevy 4 door sedan 1938 Chevy 2 door sedan 1950 Willys Jeepster 1955 Studebaker President 4 door 1977 Ford F250 1979 Glastron 17' 1948 John Deere A 1960 John Deere 2010 1979 Satoh S650G -- 2000 Bichon (Doby)
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#6
02-26-2007, 11:00 PM
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Funny, I just collected all the parts to do the exact same thing for a 250 lwb that the PO switched to an Edelbrock (the euro M123 motor is 2.5l and uses essentially same 4A1 carb).
I was going to use the original chevy 2.8 computer first to see how it goes. -CTH
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#7
02-26-2007, 11:22 PM
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Could I put on the djet system from my 73 450SE parts car?
__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes
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#8
02-27-2007, 10:35 AM
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Happy Motoring, Mark
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DrDKW
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#9
02-27-2007, 12:59 PM
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Wonder what model Edelbrock Q-jet carb is the equivalent.
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Nathan '74 280C - gone to a new home for the finishing it deserves. '64 356SC '74 914 2.0 Last edited by JMURiz; 02-27-2007 at 01:12 PM.
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#10
02-27-2007, 03:20 PM
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Quote:
- Modifying the intake manifold and/or heads for the injectors and MAP sensor - Modifying the distributor to accept trigger points - Found a way to get the trigger points to fire a sequence for a 6-cyl engine rather than a 4/8 cyl one Basically, it is possible with a lot of work, modifying and time. But I'd suggest MegaSquirt before D-Jet. Now if you can find one that came with its OWN D-Jet... Keep in mind, each D-Jet ECU is made for the engine it was originally put on. A 3.5 ECU has a different volumetric curve built in than a 4.5's, and I'm sure a 4.5's ECU would have a way different volumetric calculation than an m110 would need...
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k
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#11
02-27-2007, 06:40 PM
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The M114E and M110E motors were EFI equipped 6 cylinders. I have one of each waiting for a suitable car to put them in.
-CTH
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#12
02-27-2007, 09:35 PM
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Ken
You can drop that 350 from your roadmaster into it and scare the crap out of many M-100 owners :-). All the best
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With best regards Al
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#13
02-28-2007, 07:25 AM
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Quote:
__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes
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#14
02-28-2007, 07:31 AM
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Quote:
good luck. if converting a mb six i would use the edelbrock q jet replacement carb. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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