Dodge Cummins great for VO!

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

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Dodge Cummins great for VO!

Postby SunWizard » Tue Mar 04, 2008 11:50 pm

I think the 94-98.5 Dodge cummins have the best engine available. See my truck here: http://www.burnveg.com/forum/viewtopic.php?t=28
They are rated for an average of 350k miles before overhaul, about double most other diesels.

The stock diesel fuel filter is in a bad spot, but that doesn't matter since I run on VO 95% of the time. My VO filter is very easy to change because of where I put it. My diesel filter should last >10 years at the rate I use diesel.

The automatics can wear out after 200k or so, and so can the 5 speeds, depending on how much huge loads you pull. They both cost similar prices to rebuild, so get whatever you prefer. You hear about this because the engines last >500k easily, more than most Fords and Chevys, so that it becomes an isssue. The automatics get the same mileage as the sticks because they have a lock up torque converter at >35mph.

Mine is a quad cab (good size rear seat but no rear doors), long bed, 4x4, 3/4 ton, bought 2 years ago for $9k and looks and drives like new, with 140k miles which is low for its age. A 94-98.5 often sells for more than the newer ones even if its got higher miles since its well known to be the best engine ever put into pickup trucks.

Very easy to convert to 2 tank VO, and it has the strongest lift pump I have ever seen (cam driven piston, only in those years.) Huge torque at low RPMs, mine is 1200 rpm at 55 mph and still has plenty of passing power without downshifting.

The long stroke lower RPM engine burns VO much better since it has slower burn characteristics than diesel. Thats also part of why they last so long. The other reason is they are built with huge oversized bearings and every other part. A 4BT cummins (4 cylinder version of the same engine) weighs 120 pounds more than an 8 cylinder chevy diesel.
Last edited by SunWizard on Mon Mar 17, 2008 10:27 am, edited 1 time in total.
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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Postby SunWizard » Tue Mar 04, 2008 11:53 pm

Pre-94 Dodges use a diaphragm lift pump which is not as good. Many retro-fit the better 94-98.5 piston pump in its place, but you have to regulate it correctly since the piston puts out more pressure. I know some have used those older pumps on VO, but I have no experience with it, other than reading that they don't last as long.

Many of the >98.5 Dodges retro-fit a piston pump in them since its better than the electronic pumps people buy like the FASS. The trouble on the newer (>98.5) ones is you need a new cam that has the lobe for the pump. A pre-94 has the cam lobe so is an easy swap.
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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Postby Cumminscanuck » Wed Mar 05, 2008 9:44 am

I have to agree with you Sunwizard, the piston driven pump on those engines is pretty bomb proof BUT, I still love my 98.5 :D which I'm in the process of converting. Pictures are here for those interested. http://good-times.webshots.com/photo/21 ... 7177dJzyBG I will update these as the conversion progrsses.
2000 24 VALVE Quad Cab 2500 SLT. Edge Comp. 275 RV's. PDR HX 35/14 hybrid turbo. 4" Diamond Flow Exhaust. Isspro Pyro, Boost, Trans. Temp. Fuel Pressure, Gauges. Turbo Master. Silicone Boot Kit. FASS. BHAF. Running on SVO.
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Postby canolafunola » Wed Mar 05, 2008 9:58 am

I picked up the RV in my sig 3 months ago so it's kinda new to me (including the engine). I am in the planning stages of a SVO 2 tank conversion. The engine is a 2nd gen Cummins 5.9 with intercooler and the P7100 mechanical IP. Fuel consumption is 7 to 12 mpg depending on load and how it's driven per previous owner. I have read that the banjo fuel fittings can be a source of restriction to flow. While I have not taken it apart yet, I have measured the steel lines from the piston pump to fuel filter to IP to be 5/16 o.d. I think the 5/16 lines are ok but do you think the orifices in the banjo fittings/ hollow bolts are too restrictive for VO for my rig?

I would also like to use manual valves instead of solenoids but having the engine 32' behind the driver's seat poses some challenges. Is running push pull cables to the manual valves that far back practical?
93 Gulfstream RV w Cummins 5.9 diesel pusher
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Postby SunWizard » Wed Mar 05, 2008 10:12 am

The piston lift pump is strong enough that I don't think the banjo fittings will be a restriction. If yours has a diagphragm lift pump, I would upgrade it to the piston style, its easy. As long as you get the VO hot enough (>160F) before it gets to the IP. Not enough heat at the filter is the common restriction.

I don't think having cables that long is very practical, you should probably go with solenoids.
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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Postby Jake Palmer » Wed Mar 05, 2008 10:17 am

There's a guy here in town with a '92 Dodge Ram with a Cummins 5.9 running on WVO. I helped him map out the fuel system, but unfortunately his supply port on the tank is only 1/4"... he's had an aweful time with air leaks.

Just teh same, it is a fantastic engine, and that Holsett turbo is the size of a toilet! I get weak in the knees just looking at it
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Postby SunWizard » Wed Mar 05, 2008 10:53 am

This confirms what I read of Tim Cooks posts who is single tanking his 1st gen Dodge and he mentioned the tank pickup and its fittings being his worst restriction, so he replaced it.
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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Postby canolafunola » Wed Mar 05, 2008 10:56 am

I am certain I have a piston lift pump. How do I tell what kind of turbo I have one mine (it's quite rusty and I doubt any markings are legible)? I may have some pics. I'll post if I can find them.
93 Gulfstream RV w Cummins 5.9 diesel pusher
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Postby canolafunola » Wed Mar 05, 2008 11:15 am

Here's a pic of the engine/turbo

Image
93 Gulfstream RV w Cummins 5.9 diesel pusher
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Postby canolafunola » Wed Mar 05, 2008 11:22 am

Here's the fuel filter. The line going downwards go to the lift pump. Can you tell from the pic if that is a piston pump?

Image
93 Gulfstream RV w Cummins 5.9 diesel pusher
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Postby SunWizard » Wed Mar 05, 2008 1:14 pm

I can't tell from that pic. A diagphragm pump will have a roughly 3" round portion like on old gas cars. While the piston ones are slim.
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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Joined: Mon Dec 11, 2006 2:53 pm
Location: N. Colorado

94 Dodge 3500 CTD

Postby greenteaminc » Wed Mar 12, 2008 10:40 pm

So,
I've been dreaming of running a greaser for years, and finally decided to stop the wait, and move on it. I found our truck for $8,500; a real gem with only 65K on the odometer, and regular maintenance with previous owners. We have been working with a guy named Jason from Green Logic to order the conversion parts, and wanted to sunwizard some questions about them beforehand. I want to get the best parts available as that is my motto for maintenance. Do you have a description of the veg system you run in your Dodge? Thanks,
Tad
1995 Dodge 3500 CTD
Conversion in progress(just started)
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Postby SunWizard » Thu Mar 13, 2008 9:04 am

See my post in the converted vehicle database here:
http://www.burnveg.com/forum/viewtopic.php?t=28
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

Postby canolafunola » Wed Mar 19, 2008 9:03 pm

I have a question for the P7100 experts. Does it have an internal transfer pump? If so, what kind is it and how much suction does it provide? In my motorhome conversion, I am thinking of locating one of 4 VO tanks right under the bed, which will place it directly over the engine, and gravity feed the P7100. Will gravity feeding VO to the P7100 provide sufficient fuel flow under WOT?

The reason for having multiple VO tanks is weight distribution and space availability. The other tanks will be under the frame and will feed the under-bed tank by electric transfer pumps.
93 Gulfstream RV w Cummins 5.9 diesel pusher
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Postby SunWizard » Wed Mar 19, 2008 9:35 pm

The P7100 has no internal transfer pump. You need a lift pump, especially to get the fuel through your 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
Site Admin
 
Posts: 1719
Joined: Mon Dec 11, 2006 2:53 pm
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