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TOPIC: Nissan 1400 LDV Change from standard carb to 36 weber DCD

Nissan 1400 LDV Change from standard carb to 36 weber DCD 07 Apr 2016 23:49 #13

  • Tracy Gallaway
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Yes I think your procedure is exactly correct! Good emperical procedure!

Tracy G
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Nissan 1400 LDV Change from standard carb to 36 weber DCD 08 Apr 2016 00:45 #14

  • Martin Swart
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Thank you Tracy.

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 14 Apr 2016 01:03 #15

  • GregK
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16.6 km/litre is almost 40mpg!!

I'm sure you can take it past that, and be consistent at that degree of efficiency, with a few of the complimentary add-one to the Groove we talk about here.

My first thought would be to go after the parasitic losses in the power train. RVS treatment on my old truck gave me around 5mpg - I did engine, transmission and differential.

How are the gaskets? Any vacuum leaks?

Ignition - fresh plugs/wires/cap/rotor would lower resistance and make for bigger/better spark.

What about shaping the throttle plate? Can it be done here?

Any or all of these things could take you up into the mid or even high 40mpg range...or more with highest octane fuel...

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 14 Apr 2016 12:01 #16

  • Tracy Gallaway
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Thanks for translating standard to Metric, Greg, I didn't realize how good those numbers were. Based on my own Weber, I doubt I'd try shaping the throttle plate. But reducing parasitic losses--yes definitely. Knock the gargoyles and drag inducing junk off the wings, so to speak! Many of our "tricks" can do about as well as the Groove itself when it comes to boosting economy.

Can't wait to see how Ystervark does on this cool little truck! :P

Tracy G
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Nissan 1400 LDV Change from standard carb to 36 weber DCD 14 Apr 2016 15:05 #17

  • GregK
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Yes indeed, 16.6 km/l is just a hair over 39 USmpg...

What I don't remember Martin mentioning is if he increased tire pressure, but that would cut one of the biggest fuel economy parasites down and increase mileage/efficiency. My biggest worry is always powertrain parasites that add up from simple wear and tear - a vehicle of this age must have some parts that have worn enough to take it just outside of what it was designed to do...

It's the little things that add up and contribute to the big picture...

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 14 Apr 2016 16:20 #18

  • Tracy Gallaway
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A careful analysis of any vehicle's condition, age, mileage, etc. contributes to successful outcomes. As a mechanic, I would ask questions of the owner to ascertain it's history. The preliminary step to diagnosing problems, and recommending solutions. Once you become aware of various sources of losses or inefficiencies in vehicles//engines, you begin to see the obvious solutions. I like the holistic approach, looking at the vehicle as a combination of systems. Thinking that way, you then can begin to understand how one system affects the other systems, and the whole.

We Gadgetmen just happen to have a very effective combination of things that will work on most any vehicle or engine! ;) Of course, in the end, it's the Driver who determines outcomes!

Tracy G
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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 08:49 #19

  • Martin Swart
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Greg.

I did not increase tire pressure. Although this vehicle is very old it has 130 000 km that is close to 81 000 miles. So I don't worry to much about parasitic loses. We did however replace oil in the differential and gearbox. We also added duralube. I do think duralube should make a big difference in combatting wear and resistance.

Guys also remember these are test conditions on the MPGs. You wont come close to that when you have normal driving conditions. We Kept the speed constant and at 80 KM/hr that is about 50 MPH. We wanted to do that because we wanted to take the driver influence out of the equation.

I will post pictures later of where we are with the conversion. We had to convert the intake manifold a lot. I felt that using an adapter plate would influence the groove negative. So we had to add a aluminium plate on top of the normal intake and drill bigger holes to accommodate the Weber...

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 08:57 #20

  • Martin Swart
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Where we are now...........

We took the intake from this





To this


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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 09:22 #21

  • Martin Swart
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I think we doubled intake hole size Almost :cheer:

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 10:30 #22

  • GregK
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You're quite fearless in modification from stock...I'm envious! That should help make for big, fast/strong groove vortices inside the manifold, and big gains in efficiency.

Duralube will help the surfaces stay slippery, but the RVS rebuilds them, returning them to factory tolerances, or tighter. I'm obviously a big believer, based on trying it in my last vehicle, and don't hesitate to suggest it based on that.

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 10:58 #23

  • Martin Swart
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Greg do you have a photo of RSV Please or a link.

I want to investigate a little....

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Nissan 1400 LDV Change from standard carb to 36 weber DCD 15 Apr 2016 12:46 #24

  • GregK
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I'll have to poke around here on the forum for the link to the place in the US that sells the concentrated gel (greenerplanetenterprises.com seems to stick in my head), but I've since learned that there is a Canadian dealer with a better website who sells ready to use bottles - the gel is premixed in oil for easy application. Rvsmaster.com
I'd think for a lower shipping cost, you'd want the gel concentrate. Of course, you'll have to factor in the rand -> US/Canadian dollar exchange to make your final decision...

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