mb 508 / OM314

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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mb 508 / OM314

Postby svo100 » Sun Apr 01, 2012 3:31 am

Hello fellas. I am about to start a new project, converting my 508 Mercedes with the OM314 into a veggie truck.

Some info about the car /engine
-1986
- 3.8 Liter - 4 cylinder
-Bosch inline
-DI

What makes this engine differ from most others, the injectors are under the valve cover,getting a nice bath of hot engine oil.

Heres a video someone made where you can see the injectors http://www.youtube.com/watch?v=VWqANVpJ1Ck
When the engine gets more RPM´s the oil squirts all over the injectors. I have not yet tested how hot the injectors get when the engine is fully hot, but will do that with the IR thermometer .

I was thinking that only some 3 way valves,looping and a heated filter would do the trick.. Run her hot, then switch over.

What ya guys think ??
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Re: mb 508 / OM314

Postby SunWizard » Sun Apr 01, 2012 8:38 am

Looks like a fun project. If you want to run in cold weather, better to do a full 2 tank setup, since without a heated pickup and lines your tank of WVO can be solid and you can't get it to the engine.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Re: mb 508 / OM314

Postby svo100 » Sun Apr 01, 2012 9:27 am

Yes, 2 tanks is a must if driving in cold.. but i plan to drive this only in summers with Wvo.
Mainly , i wanted opinions about the engine, how many think that a fuel heater is a must although the injectors are inside the valvecover ? IMO all the fuel heating ETC would be useless as long as the engine is heated to normal temp. and the injectors are hot. .
Will the inline IP summer from pumping non-heated WVO ? i doubt.

I have no problem adding a plateheater or what ever it takes.. But if it dont need all that, why add it.
It is a very reliable engine, low powered but durable. Only thing i dont like is its a DI,and there fore ring gumming is always on my mind..IF it is a issue.


Last summer i drove 30,000km with a 1989 (124) 250d , 750.000km, with no modifications with 50-70%wvo blend. i used probably 15 filters, all the gung from the tank... when i sold the car for 200€ it ran the same as when i bought it.

At the moment i am trying to kill a RENAULT 1.9 TDI (vp44) 1998 . It has 400.000km on it, and i am driving a 50-50 blend with no modifications. SO far so good and no problems at all.
svo100
 
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Re: mb 508 / OM314

Postby SunWizard » Sun Apr 01, 2012 10:24 am

Heated filters provide very little heat, so you can drop that and eliminate adding any coolant plumbing. If its cold enough for the WVO to cloud and clog the filter, a heated filter won't be enough, and you need either a FPHE or other heat source like a TiH heated line before the filter.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Re: mb 508 / OM314

Postby svo100 » Sun Apr 01, 2012 10:31 am

Ok, but no opinion about the injectors getting a hot oil bath, do you think that it is enough heat for proper spray for the DI ?
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Re: mb 508 / OM314

Postby SunWizard » Sun Apr 01, 2012 11:07 am

svo100 wrote:Ok, but no opinion about the injectors getting a hot oil bath, do you think that it is enough heat for proper spray for the DI ?

I think a FPHE should still be used. First because the coolant gets hot much quicker and you would know when you are at a good temp from your coolant guage, second because the heat exchange area on an injector isn't very much. Everyone's injectors run fairly hot since they are right in the head and close to the combustion chamber.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
Site Admin
 
Posts: 1719
Joined: Mon Dec 11, 2006 2:53 pm
Location: N. Colorado

Re: mb 508 / OM314

Postby vatch23 » Tue Apr 30, 2013 9:53 am

So how did it work out? Im new to this forum and want to run my Mb 508 on used oil. There are English "kits" with éverything needed except the second tank , and I thought of buying the "heaviest" I can find, but of course dont want to ruin my van. Anybody else got experience with such a van?
Greetings
Magnus
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Re: mb 508 / OM314

Postby STFfromFrance » Tue Mar 24, 2015 7:29 pm

Hello,
Did you do something since ?
Few years ago (about 2003-2005) a french pro-Vegoil association was driving a workshop truck to convert vehicules on meetings, it was a 508. Don't know how much, but they made a lot of kms.
If you made something, i'm intersted by your return.
As it's a DI engine, it's better on long travels than city driving, but with a good system, it works, 5 rings pistons also helps ;-)
Mine only drives on blend, not enough time to convert it, and little use of it at the moment, good shape injectors and HHO kit also helps to reduce smoke and smell :mrgreen:

STF
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