Getting more fuel into an OM617 diesel

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3DB
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Getting more fuel into an OM617 diesel

Post by 3DB » Fri 24 Mar, 2017 9:55 pm

My OM617 was naturally aspirated from the factory, but now has a turbo fitted with an unmodified injection pump.

It has no ALDA to compensate for the extra air being put in and fuel delivery is set as per the NA engine.

The turbo on it is probably too big, so takes quite a while to make boost and suffers from lag down low.

It has a water-methanol injection system that helps a bit, but I feel it really needs more fuel right through the rev range to really make the most of the turbo.

It has an exhaust gas temperature gauge with probe plumbed into the exhaust manifold before the turbo and currently runs very cool. I don’t think I have ever seen EGTs higher than 300C. So there is some room to move there without things getting too hot.

It isn't too smoky at present since I rebuilt the injectors, so I think I can get away with a little bit of extra smoke off-boost.

I have had great success adding more fuel to my Rodeo using the smoke screw on the rotary injector pump, increasing the power and torque by around 60% (according to a dyno) while keeping EGTs below 550C most of the time. But it seems it is not so simple on the inline IP on the Mercedes.

Has anyone got any thoughts on how I might add some more fuel without having to go down the expensive road of putting bigger elements in the pump?

Is it possible to retrofit ALDA to a NA pump?
3DB
1976 W123 300D (weekend warrior on biodiesel)
1995 Holden Rodeo 2.8 factory turbo diesel ute (daily driver...also on biodiesel)
(@thirddegreeburns on Instagram)

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Tony From West Oz
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Re: Getting more fuel into an OM617 diesel

Post by Tony From West Oz » Sat 25 Mar, 2017 1:35 am

3DB follow this link:
http://mercedesforum.com/forum/diesel-p ... ment+pumps

If you want an ALDA then you would be best advised to buy an IP which has one already.
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 (occasional tourer)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

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3DB
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Joined: Thu 15 Oct, 2015 2:46 pm
Model you own: w123
Location: Sydney

Re: Getting more fuel into an OM617 diesel

Post by 3DB » Sun 26 Mar, 2017 7:34 pm

Thanks, Tony.

That is an amazingly comprehensive thread. Covers pretty much everything.
3DB
1976 W123 300D (weekend warrior on biodiesel)
1995 Holden Rodeo 2.8 factory turbo diesel ute (daily driver...also on biodiesel)
(@thirddegreeburns on Instagram)

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AMGC36
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Location: LIME STONE COAST Mt Gambier South Australia

Re: Getting more fuel into an OM617 diesel

Post by AMGC36 » Sun 26 Mar, 2017 9:49 pm

Hi
Some of us that run SSangyongs Musso and Rexton 2.9 5 cylinder merc motor have sent our pump DIESELMEKENS and had larger elements fitted [Only way to go] Goran Lindgren is the best in the world :notworthy: :notworthy: :notworthy:
https://web.facebook.com/dieselmeken/ http://www.dieselmeken.se/
Goran works on some of the fastest most powerfull pumps from all over the world
Dyno sheet of pump ran in geelong https://web.facebook.com/dieselmeken/ph ... 46/?type=3
Cheers Stefan
1995 W202 AMG C36
Rexton 2.9 with Dieselmeken super pump on WVO

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3DB
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Joined: Thu 15 Oct, 2015 2:46 pm
Model you own: w123
Location: Sydney

Re: Getting more fuel into an OM617 diesel

Post by 3DB » Thu 30 Mar, 2017 9:18 pm

A Dieselmeken pump would be great but I think it would cost more than the car is worth.
3DB
1976 W123 300D (weekend warrior on biodiesel)
1995 Holden Rodeo 2.8 factory turbo diesel ute (daily driver...also on biodiesel)
(@thirddegreeburns on Instagram)

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