280 injected motor into 280s

1973-1980 : 280S, 280SE, 280SEL, 300SD, 350SE, 350SEL, 450SE, 450SEL, 450SEL 6.9
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gez110
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Model you own: w123

280 injected motor into 280s

Post by gez110 » Fri 02 Mar, 2018 9:37 pm

Hey guys,

A mate has a 280s with a knackered engine (sat for years with water in the bores.....) and a W123 280e. Has anyone taken a 280 injected motor from a w123 and fitted it to a 116 280s cary car? From what I can see i'll need to swap over the exhaust manifolds, fuel lines, vac lines etc.

Cheers

Steve

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Tony From West Oz
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Model you own: w202
Location: Bedfordale WA

Re: 280 injected motor into 280s

Post by Tony From West Oz » Sat 03 Mar, 2018 12:16 am

The simplest solution may be to swap the donor car engine and transmission, along with all engine electrics, into the recipient vehicle.
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
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gez110
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Model you own: w123

Re: 280 injected motor into 280s

Post by gez110 » Sat 03 Mar, 2018 9:25 am

My main concern is ensuring the engine mounts will swap over as the w116 engine bay is different to the w123 i.e wider. Also, going from a carby motor to injected could cause a few issues. As in fuel pump, lines etc. The 116 is lovely and needs saving, the donor w123 is already mostly stripped and suffered a failed flex disc causing damage to underside and probably the trans. I'm a bit torn. He also has another w123 wagon that's running and solid.......... So many cool cars
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gez110
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Posts: 34
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Model you own: w123

Re: 280 injected motor into 280s

Post by gez110 » Sat 03 Mar, 2018 9:27 am

How easy would it be to stick the 280s carbs on the 280e engine, is it just an inlet manifold swap or would I need to swap heads?

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Lance
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Re: 280 injected motor into 280s

Post by Lance » Sat 03 Mar, 2018 1:56 pm

Should be easy, bolt intake and exhausts and engine mount including the long arm that bolts to the block from W116, then bolt straight in. Though W123 engine is low compressionso a bit less power. Or take intake manifold and full injection system from the W123.
Regards,
Lance Smart

W114 280E 5 speed manual
W123 280E

gez110
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Model you own: w123

Re: 280 injected motor into 280s

Post by gez110 » Sat 03 Mar, 2018 8:16 pm

Cheers Lance, i didn't know the w123 280 motor had a lower CR. The 280s motor in the 116 is seized unfortunately, hence the question regarding swapping motors from the w123.

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Lance
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Re: 280 injected motor into 280s

Post by Lance » Sat 03 Mar, 2018 9:09 pm

Just drop it all in including fuel injection has as much power as the carby engine.
Regards,
Lance Smart

W114 280E 5 speed manual
W123 280E

gez110
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Re: 280 injected motor into 280s

Post by gez110 » Sat 03 Mar, 2018 10:49 pm

Sounds like the plan. I just need to persuade him to sell :-)

gez110
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Re: 280 injected motor into 280s

Post by gez110 » Sun 19 Aug, 2018 3:22 pm

Finally agreed to buy the car! It's in very good condition, apart from the siezed engine! Stack fo service history, zero rust and good paintwork.

So, my plan is to use a donor 280 motor out of my mates wrecked w123 wagon. I'll swap the inlet manifold over from the cars original en gine to keep the swap simple.

While it's out, whate would you recommend changing, such as seals. I'm thinking crank mains, sump gasket, rocker gasket (tappets need adjusting) etc. I'll probably fit a new water pump too. Any recommendations?

Long term, I'd like to find and fit a mercedes V8.......

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