Holly carburetor on a W126 - Mercedes-Benz Forum
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#1 (permalink) Old 08-24-2007, 10:10 PM
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Holly carburetor on a W126

I have a friend who has a 1985 500 SEC. He's planning to replace his Bosch CIS fuel injection system with a Holly carburetor + amenities. Is this really possible? If so, how easy would it be, because I would certainly love to get rid of this fuel injection system....too much trouble, IMO.

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#2 (permalink) Old 08-24-2007, 11:10 PM
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not cheap, but give near 50 more hp.
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"500"sel - M117.968 --> M119.960 conversion, standalone LinkPlus ECU (linkecu.com) tuned to ~260kw, full dual 2.25" mandrel bend exhaust, AMG 2nd Gen full body kit & interior mods, Bilstein HD's and custom springs. 17" SSR wheels 8.5J front 9.5J rear (235, 255 tyres)

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#3 (permalink) Old 08-24-2007, 11:29 PM
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I love how simple looking the engine begins to look. What's it look like with the carburetor? How did you replace the fuel lines and injectors? and where did you get that intake manifold (is it custom made?) Sweet ride, eh? Any pics with the AMG kit?

Last edited by GotTheBenz; 08-24-2007 at 11:35 PM.
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#4 (permalink) Old 08-24-2007, 11:39 PM
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The inj holes where welsh/frost plugged, the water crossover gallery has been replaced with the part form the standard intake manifold you can just cut it off with a bandsaw (you see here two threaded fittings but this didnt allow enough flow). Fule pump is a holley blue, fuel lines are left stock only with the addition of an adjustable fuel regulator and the appropriate length hoses to the carb.
The car has hot cams, mechanical lifter conversion with 130lb(i think) Beehive springs now and high compression with custom Tri y extractors into a twin 2.5" exhaust that exits ouit the side in fron tof the rear left wheel well. It idles like a beast and the torque twist when its revved is phenominal. All reciprocating parts have been lightend and ballanced as has the flywheel, it can rev up to 7400rpm and has put out just a tad over 400Hp.

"500"sel - M117.968 --> M119.960 conversion, standalone LinkPlus ECU (linkecu.com) tuned to ~260kw, full dual 2.25" mandrel bend exhaust, AMG 2nd Gen full body kit & interior mods, Bilstein HD's and custom springs. 17" SSR wheels 8.5J front 9.5J rear (235, 255 tyres)

560sec - I hate sec's

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#5 (permalink) Old 08-25-2007, 08:43 AM
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Beautiful intake assembly!

FYI - those maroon chain guides are the proper color for a failure that is about to occur soon. HIGHLY recommend getting them out of the engine. Check your cam timing and if it's out of tolerance (5 degrees), then (pun intended) it's time for a new chain and tensioner.

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#6 (permalink) Old 08-25-2007, 08:56 AM
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Good eye, Mike!

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#7 (permalink) Old 08-25-2007, 10:54 AM
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Smile Awesome intake

Who made the intake? I would love to have one for my 500 motor. I've got a Demon carb that would be perfect for that setup.
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#8 (permalink) Old 08-25-2007, 12:29 PM
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Wow, I woudl Love that too.. ALSO has anyone fitted A Mallory or MSD Ignition system on a w126?? I am looking to do it but have no idea where to start..


1982 300CD
Adjusted ALDA|Rebuilt Garrett Turbo W/Clipped Turbine Wheel(13PSI)|
Boost Gauge Mounted In Air Vent|"Hot Air Intake"W/Catch Can And K&N|
Depo Euros|Straight Pipe Exhaust|EGR Block|Monark Injector Nozzles|


1998 GMC 6.5 Diesel 4X4
Heath Lift Pump|Marine Injectors|Gauges|Performance Chip|AFE Intake|
4in Exhaust To 6in Stack|GM8 Set To 15psi| Way Too Much More!

SOLD AND MISSED:
85' 380SE
83' 500SEL
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#9 (permalink) Old 08-25-2007, 01:46 PM
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MSD's are a waste of $$ unless you are running a seriously tweked engine, ie, like landers or one w/ forced induction. It's on my black coupe and the only thing I've found it good for is going through cap/rotor's quicker then usual. Prob. for around what the carb/intake runs one could do a MS II Conversion and have true stand alone EFI/Ignition. Jonathan

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#10 (permalink) Old 08-25-2007, 02:18 PM
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Originally Posted by allnpt0
Who made the intake? I would love to have one for my 500 motor. I've got a Demon carb that would be perfect for that setup.
What size is your Demon?
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