OP
NH "T"urbo "C"harged 24DA
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JSUnlimited
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OP
JSUnlimited
Platinum Member
As in one of the earlier pics, you saw the exhaust outlet side of the turbo. I will need to fab up a plate with a elbow to cover that as the guy I bought the turbo from did not have the turbo exhaust manifold. This should not be any big deal, however I only have a limited space between the turbo and the firewall.
The next couple of pics will give you an idea of the space. I'll be using 1-3/4 pipe for the exhaust outlet. This is the same stuff that I used to make my vertical exhaust set-up. So, the exhaust will come off the turbo and continue down between the side hood shroud with a slight "kick out" to go past the starter and the power steering lines. It will then tie into the existing tail pipe.
You'll notice that there is nowhere for a muffler. Unless I can find something small to fit in somewhere, there won't be one! Several poeple I've talked to said that the turbo will muffle the exhaust some. I wear earplugs anyways so whatever. You should hear the turbo whine!
The next couple of pics will give you an idea of the space. I'll be using 1-3/4 pipe for the exhaust outlet. This is the same stuff that I used to make my vertical exhaust set-up. So, the exhaust will come off the turbo and continue down between the side hood shroud with a slight "kick out" to go past the starter and the power steering lines. It will then tie into the existing tail pipe.
You'll notice that there is nowhere for a muffler. Unless I can find something small to fit in somewhere, there won't be one! Several poeple I've talked to said that the turbo will muffle the exhaust some. I wear earplugs anyways so whatever. You should hear the turbo whine!
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JSUnlimited
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Now for the BIG problem! That is trying to get a oil supply to and from the turbo. In looking over the engine and leafing through the service manual, I found a tube that runs from the right lower side (looking forward) of the block up to the front of the valve cover. This is is where the oil pressure sending unit is and also this supplies oil to the rocker arms, rocker arm shaft and pushrod guides. Since I want to T-off of this location, I was concerned that there will be enough volume/pressure to supply everything. I decided that it would be best to increase the size of that line. The line is held at both ends by a 8mm banjo bolt type fitting. The size of the line itself is only 1/8" id aprox...real small. According to the service manual oil psi for this engine 45-60 psi.
The idea I had was to use 1/4" jic fittings into 1/4" hyd lines with associated fittings to connect everything. Keep in mind, the orfice openings on the engine and the turbo are very small so I am confident that volume won't be an issue
The problem is finding a fitting to go from 8mm 1.25 pitch thread into 1/4" jic. What I had to do is to get a 1/4" pipe thread to 1/4" jic fitting and have the pipe thread side turned down on a lathe to be able to run a 8mm die over it. The old man is a machinist and he is working on it now, should have the fittings on Monday. He said that there "should be enough" material to be able to turn it down and thread it. I won't have the lines made up until after the turbo is mounted. If this does not work, it may throw a wrench into the entire project. Another option is to use a 12v scavenge pump. but those are expensive and I don't want to rely on something electrical to supply oil.
If you guys have a plan B for oil supply let me know.
A pic of where the existing line goes into the OP sensor/valve cover.
The idea I had was to use 1/4" jic fittings into 1/4" hyd lines with associated fittings to connect everything. Keep in mind, the orfice openings on the engine and the turbo are very small so I am confident that volume won't be an issue
The problem is finding a fitting to go from 8mm 1.25 pitch thread into 1/4" jic. What I had to do is to get a 1/4" pipe thread to 1/4" jic fitting and have the pipe thread side turned down on a lathe to be able to run a 8mm die over it. The old man is a machinist and he is working on it now, should have the fittings on Monday. He said that there "should be enough" material to be able to turn it down and thread it. I won't have the lines made up until after the turbo is mounted. If this does not work, it may throw a wrench into the entire project. Another option is to use a 12v scavenge pump. but those are expensive and I don't want to rely on something electrical to supply oil.
If you guys have a plan B for oil supply let me know.
A pic of where the existing line goes into the OP sensor/valve cover.
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JSUnlimited
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Oil return is another issue. The oil return is under no/little pressure and as CATMAN stated, it relies on gravity. The only option I see is to remove the oil pan and weld in a bung to be able to thread in a fitting.
The oil pan deal is the only original part on the tractor that will be modified.
However, I have read many arguements on some other forums (import car mods) as to have the oil return go in above the oil level or below the oil level in the pan. Some guys have done it both ways and have had no problems. The concern with going in under the oil level is if gravity won't feed it well back into the pan, it could back up into the turbo and oil could seep past the seals.
I plan to pull the pan off and fill it up with the capacity of oil and see how high up it falls on the side of the pan. 3-3.5 quarts is not much, but this pan is not very big either. If the oil level in the pan is too high on the side, then I think I'll go ahead with the bung and incorporate a "dip tube" that will turn up slightly to get above the oil level and into the center (would help if tractor is on slopes) of the pan. I'll have to watch clearances with the crankshaft though.
A pic of the access point on the oil pan, same side of and below the turbo.
The oil pan deal is the only original part on the tractor that will be modified.
However, I have read many arguements on some other forums (import car mods) as to have the oil return go in above the oil level or below the oil level in the pan. Some guys have done it both ways and have had no problems. The concern with going in under the oil level is if gravity won't feed it well back into the pan, it could back up into the turbo and oil could seep past the seals.
I plan to pull the pan off and fill it up with the capacity of oil and see how high up it falls on the side of the pan. 3-3.5 quarts is not much, but this pan is not very big either. If the oil level in the pan is too high on the side, then I think I'll go ahead with the bung and incorporate a "dip tube" that will turn up slightly to get above the oil level and into the center (would help if tractor is on slopes) of the pan. I'll have to watch clearances with the crankshaft though.
A pic of the access point on the oil pan, same side of and below the turbo.
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JSUnlimited
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The manifold of the engine will be fabbed up in a "header" style with a flange on the top to mount the turbo. This has not been started yet as I'm trying to figure out the oil situation.
There are many aspects of the fabrication that will have to be taken into account and it's kind of lengthy so I won't bore you all with the details.
Here's kind of what I'm thinking, only 3 cylinders of course!
There are many aspects of the fabrication that will have to be taken into account and it's kind of lengthy so I won't bore you all with the details.
Here's kind of what I'm thinking, only 3 cylinders of course!
OP
JSUnlimited
Platinum Member
As far as connecting the turbo from the original air cleaner and then to the intake, I plan to use silicone hose made for such a thing. It will be a matter of getting the right bends, adapters etc. The most common color these come in is blue!
Sample pic of hose.
Sample pic of hose.
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JSUnlimited
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Thats it for now. I'll begin manifold fabrication soon and hopefully this oil supply/return won't be an issue.
dqdave1
Veteran Member
Can oil return line be plumbed into dipstick tube?
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JSUnlimited
Platinum Member
dave,
I thought "what a great idea!" So I ran out to the garage and checked it out. Unfortunately the dip stick tube is on the other side of the engine and would not allow for a short vertical drop. Plus the tube i.d. is very much smaller than what is required for the turbo oil return tube.
That's what is great about this place, good ideas and suggestions. Please if anyone has any thoughts or experience with turbocharging let me know.
I thought "what a great idea!" So I ran out to the garage and checked it out. Unfortunately the dip stick tube is on the other side of the engine and would not allow for a short vertical drop. Plus the tube i.d. is very much smaller than what is required for the turbo oil return tube.
That's what is great about this place, good ideas and suggestions. Please if anyone has any thoughts or experience with turbocharging let me know.
