Turbo addition to 4341?

[darylat8750ft]

Hi,
I'm new to forum so I may have not found a thread that address' this, but here is my problem. I have a 4341 that is a very satisfactory tractor. However, I live at an elevation of 8700ft. where a 60hp tractor puts out less than 40hp. The only job where more power is needed is moving snow. A 7 foot snow-thower just eats horsepower. If I added turbocharger part number 7701-1534 what other parts would I need? (Intake and exhaust manifolds look like they are the same, are they?) Obviously I will need oil lines ect. Now the big questions.

1. Are the exhaust valves the same in a 4341 as in a turbo engine or will I have to change to special valves?

2. How much power does this basic engine make in its turboed form at sea level?

3. How much power could I expect to get at 8700 feet with this turbo and:
a. stock injectors?
b. modified or different injectors?

4. Is there another turbine/compressor unit out there that makes sense?

5. If another turbine/compressor unit were found that could boost horsepower up to the 80 horsepower range, would the drive train stand up to it? (Assuming that any time I were using that kind of power most of it will be going out the PTO.)

6. Are these parts available on the used market? I'm rather price sensitive.

Thank you for your thoughts and consideration.
Daryl

 

[Renze]

I suppose your tractor is fitted with the Euro 1/Tier 1 engine, 3.9 liter. Older 4341 could have the 3.6 engine. ??

Anyways, the 3.9 liter puts out 75 hp in the 6341, and 84 in the 7341, with turbo.
On the older 2 series, the exhaust manifold including pipe, were different because the turbo bolts straight on to the manifold, on the front end of the manifold instead of at the rear end of the manifold.
Plus, you need to install an oil cooler inbetween the spin-on oil filter and the original mounting place (take off filter, mount oil cooler, re-mount oil cooler on top) including some plumbing of hoses to the oil cooler, and oil lines to and from the engine, to supply the turbo.

The engine will last at 85 hp. The transmission is exactly the same to the 85 hp models, though the gear ratios are a wee bit lower in the 4341

the main differences between turbo 84 hp 7341 and your 4341 are the gear ratios and the tires. (and off course, the turbo/oil cooler)

I have no idea about the exhaust valves, though the 7745 turbo uses a different cylinder head.


I think, you shouldn't bother about the cylinder heads (lower compression to equal up for the turbo) or the water pump, working in snow at frosty temperatures will give you plenty of refrigeration capacity.

The exhaust valves, i will check that for you.

 

[darylat8750ft]

Thanks for your reply. My tractor is rather new (2 years) with the rounded cowel, so my guess would be that it is the later engine. However, it was sold to me as 60 horsepower. I am in USA, not Europe if that makes a difference. We just moved to a new house and I can not find the oweners manual right now. (I know it is here someplace! I had it when I changed the oil a couple of months ago.)
Thanks again for your efforts.
Daryl

 

[Renze]

the valves are different.
You cannot just add the oil cooler, but also have to install the new oil filter that goes with the oil cooler unit.

I dont know if you need to change the heads if you change to turbo valves. In your cold conditions, the lower compression ratio of turbo heads is not necessary, i think..

 

[darylat8750ft]

Thanks for your reshearch. I wouldn't want to lower static compression ratio if I can avoid it, as I think that might make cold starting a little more difficult. At 8700ft the cylinder pressures are quite a bit less than at sea level. I have a friend that works in diesel tractor development and he is going to do some computer work to look at the possibilites. Would you happen to know the compression ratios of the normally asperated and the turboed engines? Thanks again, Daryl

 

[Renze]

For standard aspirated engines, it is historically about 1:17 to 1:17.9, and about 1:16.5 for turbo engines. I do not know the exact compression ratio for the 3.9 liter engine.

 

[darylat8750ft]

One more question and I'll stop taking up your time for a while.
How much boost does the stock turbo have at sea level? How about at 8000 feet elevation? I seems to me that if I were just getting back the power that is lost due to the thinner air, I might get by with the stock valves and higher compression . Even though in inlet charge will be at a higher tempature from the turbo compressing it. That would make this project more affordable.
Thank you again for your time and expertise. Daryl in Wyoming.

 

[Renze]

...the intake air temperature is nothing to worry about... It's the exhaust gas temperature that can cause problems..

 

[6745 driver]

From what I have read you want to add a turbo to your tractor to make up for you elevation above sea level. I would not think that this would over tax your tractor because even though you are adding more air to the engine the maximum amout of fuel supplied by the injector pump will remain the same. What this should do is give you the same power as you would get at sea level because the amount of fuel has not changed.

Something you should install with the turbo is an exhaust temperature gauge so you can make sure you are not overheating your exhaust.

 

[barryinmn]

Keep in mind that compressed air drops water, I used to live in Colo Spgs, 6K ft commuting from 8K ft. Make sure your intake manufold stays hot so you don't freeze up & choke off the intake! Been there & done that!

 

[Renze]

compressed air also heats up, turbo heats it up above 100C so vaporising the water into steam.... It wont be a problem as long as there's some work to do for the turbo...

 

[darylat8750ft]

Thanks for the replies. Intake tract icing under light loads hadn't occured to me. I had an early Subaru that drew intake air over the exahaust manifold like an airplane to prevent carbarator iceing. I have never heard of this being a problem with fuel injected engines. Is this common with Diesel engines? Only on turboed or also normally asperated? Daryl in Wy.