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M110 motor modification

Started by robertd, 18 May 2011, 06:28 AM

robertd

This is What it looked like before I stated
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

1980sdga

I'm not that into gassers but that split exhaust on the straight 6 is pretty d@mned awesome  8) Those are just nice looking engines.

Maybe I'm getting into gassers  :o

robertd

hey Joe,
the vin is  123 053 22 012197
Regards
Rob
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

robertd

Some of the stuff removed from the coupe
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

Big_Richard

the coupe had self leveling rear suspension ?

awesome, never knew that was even an option on those.

jbrasile

Rob,

Thought maybe EPC would give me your engine number based on the VIN but no joy... pls confirm engine number as there are several supercessions of p/n's for the manifolds.

Tks a lot,

Joe

robertd

The Barn find coupe in the pits
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

robertd

hey Joe
engine # 110 984 22 047670
Rob
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

carl888

Hi Rob,

Congratulations on your purchase!  I have been through the same issues with the W126, and feel your pain!  Actually I recall we looked at some manifolds at your place a while back when i mentioned I was going to dump the EGR but they had the port on them, for the W116 at least.

The ADR27 compliant M110 engines for Australia contain the following emission items:

1. Charcoal canister to absorb fuel vapour from the inlet system.
2. Exhaust gas recirculation to reduce combustion temperature and therefore NOx emissions
3. Smog pump to facilitate secondary combustion in the exhaust manifolds to reduce CO
4.  I am NOT certain about 1978 models, but the car may possibly have the 3/4 ignition retard vacuum switch which is energised when the transmission selects 3rd. or 4th.
5. Ignition timing set to 2 degrees ATDC.
6. 8.0:1 compression ration instead of the Euro 9.0:1.

I am doing this from memory, but in case I've left something off, I have the Australian 1978 Workshop Manual Emissions Equipment Australian supplement.  I'll bring it down one Sunday in the next few weeks, how does that sound?  (I'm currently in Penang which is why I haven't called since the concour!!)

You can see a pic of the emission junk I took off the W126 here:



Not shown is the EGR valve and air injection rail for the head.

Note, with the W126, all RHD W126's had the EGR valve mount, I bought a second set of manifolds and welded up the hole, you can see them here, before and after:









I have yet to ceramic coat them, next project!!

If you are going to the trouble, make sure you use the twin system, rather than replace with the "Y" piece.  I think no Australian W123 had the "Y" piece anyway, but I could be wrong.

A couple of tips.  The EGR injection line in the inlet manifold is the same as the oil drain plug in a Ferrari 308, they are cheap on ebay if you want to plug it nicely.  And do make sure you plug not only the manifold inlet, but the air cleaner port where the compressor gets its air from.

Anyway, once you have plugged the holes, re-time the engine, you should be able to run at least 4 degrees before TDC but you must run 95 RON fuel minimum.  Note, the fuel consumption went from 20 mpg on the W126 to an amazing 27 mpg after I ditched the gear and re-timed it.

I'm just running out the door and perhaps I've forgotten something, but I'll let you know, otherwise lets see if we can meet up in the next few weeks.

Regards,

Carl.




carl888

Rob,

With regards to the exhaust ports in the head, my plan is simply to remove the injection rail, cut the female threads off and weld up the hole in the thread then screw the threaded section back on.  I am assuming it will be very difficult to remove the threaded insert already in the head, but I cannot be sure.

Presently on the 126, the rail is still fitted, just blanked off at the check valve end.  I just can't stand seeing it fitted, however I left it in place figuring I'd do the rail, and the manifolds together.

Regards,

Carl.




carl888

Quote from: 1980sdga on 22 May 2011, 07:45 PM
I'm not that into gassers but that split exhaust on the straight 6 is pretty d@mned awesome  8) Those are just nice looking engines.

Maybe I'm getting into gassers  :o

They are, especially when there is no pollution shite fitted:


carl888

Here we go Rob, this is what you have to aim for:


carl888

Just noticed, a nice set of left hand drive exhaust manifolds. 

jjb-w116-hu

does anyone know how much a set of manifolds will cost me? I have a crack somewhere in my exhaust or such that is making my old girl sound a bit of a tractor ;) - not to mention the old manifolds are rusted and rather ugly to view!

jbrasile

jjb,

Sometimes you can find used manifolds in good condition, if not pls post your VIN and I can check price and availability at the Classic Center.

Tks,

Joe