Farmall 806 Turning up or down the Power

Bill47 Perry · Mar 17, 2010

I have heard many comments about turning up the power on an 806 diesel. How is this done? I guess raising the injector pressure. Would someone give me some more information on what is involved as in what tools and gauges are needed if you want to turn it up or bring it back to original spec's.

Thanks in advance

Bill P

DeltaRed · Mar 17, 2010

Turbo it,then turn up the pump.Then the 'Ole 8' will have LOTS of power!

komputatek · Mar 17, 2010

There has always been a lot of talk about "turning up the power". There are things to consider before doing this.
Traditionally it means to go inside the diesel pump and turn the delivery pump pressure up. This will give you more power and more fuel consumption. Basically you are allowing more fuel to be metered to the injectors. I would caution anyone considering adding a turbo and "turning the screw" as you will possibly be applying more horse power to the drivetrain than it can handle. Most shops would recommend adding the turbo and leaving the fuel metering screw alone or possibly backing off the screw and reducing fuel consumption thus netting the same same H.P. with less fuel.

I saw all this just to say many tractors have been damaged in the name of more power.

DK44H · Mar 17, 2010

Many tractors have run at more than factory specs for better than 30 years and never had one problem from turning up the power. I would say that it would be hard to find a IH tractor that is truly running "stock" or lower for that matter. Turn it up and HANG ON!!!

F20ss · Mar 18, 2010

Something to keep in mind, if you have a turbo tractor it is always better to have the pump set a little "fat" or rich. When you take a nonturbo tractor and put a turbo on it you are obviously putting a lot more oxygen into the cylinder. When you are pulling and building boost you can create a lean condition which always creates extremely hot cylinder temps. This will cause pistons to swell, scoring cylinders, and maybe catastrophic engine failure. This wont happen immediately but I dont want to see someone learn the hard way. If it is a nonturbo engine, my opinion is that you would be pissing into the wind, waste of time. The engine can only draw so much air into the cylinder and injecting more fuel will give you little to no power addition but the smoke looks cool if you like to see your money drifting in the air. I have a bit of dyno experience and I like to get all the juice I can out of an engine without affecting longevity. Happy tinkering.

Kippster · Mar 18, 2010

A turbo simply adds air and therefore adds oxygen to the engine. This increases the volumetric efficiency of the engine. Adding the turbo allows the increased fuel added by turning up the injector pump, to be burnt completely by using all the available oxygen supplied by the turbocharger. Hope that this helps make things a little more clear for some of y'all.

mkirsch · Mar 18, 2010

Which screw is the "smoke screw," the one that increases fuel delivery to the cylinder, is kind of an open secret among diesel mechanics IMHO, because it's so EASY for a novice to get greedy and ruin an engine.

dmiller · Mar 18, 2010

I bought an 806 wheatland last year. The owner said that he had had it "turned up" years ago. This is fine by me, but I don't need the power (I'm using it to bale hay).
My question is, will I get better fuel economy if I take it back in and have it "turned down". Or is the fuel economy basically uneffected since I'm only running it at about 1/2 throttle????

the tractor vet · Mar 18, 2010

The best way to tweek one is setting on a Dyno and that way you can set it correctly as for just twisten the SCREWS , well just a little can be tomuch as you have know idea where it is set now . So if you feel she is a bit doggy then take it someplace and run it on a Dyno and see where your at. FIRST as she maybe in need of some other work to perk her up . The injectors maybe getting weak and need rebuilt she may need a valve adjustment , timing maybe off the pump may need freshened up she may need a total rebuild . And i will tell you this a D361-407 engine is NOT THE ENGINE for a novice to be rebuilding . I have a 63 806 wright now with over 9000 hours on her and she runs super , But i need to pull the injectors and have Harry freshen them up and also the pump . mine is running at 115 hp. and that is the limit with out a charger , my one friend has a 64 806 with a M&W charger and he is setting at 125 and i would not want to push it any feather due to the fact that we are at the limits of cooling both on the water and also piston . It is like this my saying is THAT WHEN THEY GO THEY GO , BUT WHEN THEY GLOW THEY BLOW.

komputatek · Mar 18, 2010

My experience is with tractors under a dyno test. We could see measurable fuel consumption changes under a load.

I would think you would see some increase in fuel economy but would it be worth the expense of having it done right?

It"s easy enough to open the top of the pump and adjust the setting, but to do it so that you can measure the performance it should be connected to a dynamometer. Anything less it a guess.

Farmall 806 Turning up or down the Power

Bill47 Perry

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DeltaRed

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komputatek

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DK44H

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F20ss

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Kippster

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mkirsch

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dmiller

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the tractor vet

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komputatek

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