[WebersCarts]

Hey guys,
I got a JD F1145 that I got. The mower is junk but the engine it still good. The engine is a 28hp yanmar 3 cylinder diesel and I would like to put a turbo on it. Ive read that the Yanmar engines are rated higher than what they put out. So I am guessing the block and engine can withstand a turbo. Anyone have any suggestions or ideas?
Thanks!

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[robhay2]

There are many paths to do this. Most end up with a hole in a piston unless you are willing to spend more than the machine is worth.

Still, a few psi will always give a "boost", pun intended.

Start with a compression test for a baseline.

 

[no2498]

a cheep easy way
put the air that cools it in a air cleaner thats closed off
or only use half of it
is still stock

john

 

[no2498]

BTW the first guy i said this too had a gas motor
hurt him self bad doing it. but had done things i did not know of.
BTW he now wrights the rules for you all now. :tango_face_smile:

john

 

[WebersCarts]

a cheep easy way

put the air that cools it in a air cleaner thats closed off

or only use half of it

is still stock



john

I guess I dont get what you mean?

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[DL-North]

Do you know anything about turbos? ie, can you do the matching required or are you planning to buy a kit where the seller has done the engineering?

As for will it survive, I worked for 15 years in a diesel engine development group some years ago. After we had the NA version working well we started on the turbo version. It took 1 1/2 years of testing to finally get it to live. The 1st durability test got holes in the pistons in under 100 hrs.

So I am guessing the block and engine can withstand a turbo.

 

[Mark in Portugal]

I've done it for an overweight under engined camper I had.
I calculated the airflow, got a matching turbo, obtained a turbomap from the manufacturer, found my turbo would overspeed with an intercooler, got a different impeller and another turbomap that showed it would be just right.
I found that my motor had 19/1 compression so I left it stock. It also had oil jet cooling for the pistons, odd in a NA engine. I also left the injection timing stock.
The first thing I did was add a thermometer to the exhaust, so I could get some base line readings. I did test runs up a long steep hill.
After adding turbo + intercooler + lots of tricky plumbing, the engine ran cooler than stock [as expected]. Then I took the fuel pump to an injection specialist and had the output dialed up 30%.
The results were wonderful; the truck would go up the hill in 3rd instead of 2nd. exhaust temp was well within safety parameters and drivability was great. max boost was about 10lbs.

There is little issue with crank, block, or bearings. Adding pressure and torque only exerts a little more force, it's the rpm that adds big stress.
Heat is the enemy; with an intercooler and proper research, that can be avoided.

A lot of people talk about it, very few do it. It's just too easy to get something ready made with the power you want.

 

[WebersCarts]

I know how turbos work and how to go about doing it. I've never added one to a motor though. That is why I am doing my research within multiple groups and making sure I am going about it the correct way.

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[DL-North]

Heat is the big problem, but is not easy to deal with.
IIRC our exhaust temps with the turbo were about 75 degree C higher than the NA. Turbine in temps were about 720 to 740.
This with an aftercooler to reduce inlet temps.
Note that this was on an "industrial" engine designed to run at rated all day long.
When we 1st started on the turbo we could also crack heads and ex manifolds in about 100 hours.

Heat is the enemy; with an intercooler and proper research, that can be avoided.

 

[steddy]

I guess I dont get what you mean?

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I think I got it, but just an assumption (and it might work)...
The flywheel has a built in fan that moves air over the engine to help keep it cool. He's saying to capture some of that moving air and funnel it back to the intake... Now you're constantly forcing air into the carburetor, like the effect a turbo has. I'm not sure though, this might almost be more like a supercharger than a turbocharger. A turbo is an exhaust powered the air pump, whereas a supercharger is an engine driven air pump accessory (like the flywheel fan in question).

On edit - whatever the original poster does doesn’t have to last for hours and hours... about 5 minutes worth of stupid amounts of power is all he needs for an evening ?

 

[WebersCarts]

I have an oil cooler that I had gotten off of the JD f1145 and I will be adding a Intercooler as well. I see Kubota has about the same style motor and baseline hp was the same. There's was 27.6hp i believe and hp after turbo was like 31ish.

I'm not looking for any super high boost. I'm looking for around 5-8 lbs which shouldn't be to extreme. I dont plan on messing with the governor which should help also.

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[Mark in Portugal]

I used to live in India; my machinist friend asked me what a turbo was, since people liked to write "turbo" on their cars and bikes.
So I bought a book called "turbochargers" by Hugh Maccinnes It was written in the 80's, maybe the 70's.
It's mostly about American cars, but has a 2 page section on diesel.
I got everything I needed from that book.
And when I got the turbo, I took it to my friend in his little back street workshop; "This is a turbo!"
And all was good.

 

[Hydronerd]

I think I got it, but just an assumption (and it might work)...
The flywheel has a built in fan that moves air over the engine to help keep it cool. He's saying to capture some of that moving air and funnel it back to the intake... Now you're constantly forcing air into the carburetor, like the effect a turbo has. I'm not sure though, this might almost be more like a supercharger than a turbocharger. A turbo is an exhaust powered the air pump, whereas a supercharger is an engine driven air pump accessory (like the flywheel fan in question).

On edit - whatever the original poster does doesn’t have to last for hours and hours... about 5 minutes worth of stupid amounts of power is all he needs for an evening ?

Wouldn't the Yanmar be liquid cooled?

 

[DL-North]

You haven't said but what do you plan to do with this motor? And why do you want to add a turbo?

And what is the condition of the motor, it sounds like it might have bunch of hours and mostly worn out.
Not the best choice to increase power unless the rest of the engine is rebuilt.
And 5-8 lbs is not much, again, why bother?

I got a JD F1145 that I got. The mower is junk but the engine it still good. The engine is a 28hp yanmar 3 cylinder diesel and I would like to put a turbo on it.

 

[steddy]

Wouldn't the Yanmar be liquid cooled?

My bad!
No problem though... do same thing with cooling fan air... just duct it into the air cleaner.
I’ve been assuming he’s going to use it for a pulling machine given the forum he posted in, but anything is possible.

 

[WebersCarts]

You haven't said but what do you plan to do with this motor? And why do you want to add a turbo?



And what is the condition of the motor, it sounds like it might have bunch of hours and mostly worn out.

Not the best choice to increase power unless the rest of the engine is rebuilt.

And 5-8 lbs is not much, again, why bother?

I build custom golf cart and this is going into my golf cart and used for pulling a trailer around. I already did a diesel cart so now I want to make a cart turbocharged. From what the hour meter says it only has 1100 hours.

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[Mark in Portugal]

If you add a turbo and intercooler, your 28HP motor will run cooler than stock at 28HP.
This is from the book mentioned, but I didn't believe it until I confirmed it with my own measurements.

If you increase fuel 30%, it will probably run a little hotter than stock while running at the new full power of around 35HP.

If you run lower RPM for the same load after turbo conversion [by using a higher gear], exhaust temperature could be higher; or not. Assuming you keep your exhaust temp below 800C, the stress on the motor is lower than the higher RPM required to do the same work without the turbo.

A turbo-diesel motor has great response, like a gasoline engine.

Of course, you could just use a bigger NA engine; but then you don't get the high power bragging rights of the turbo golf cart.

Where are you located?

 

[Mark in Portugal]

do same thing with cooling fan air... just duct it into the air cleaner.

There would be little or no effect.
A turbocharger produces a LOT of energy, which is used to compress a large volume of air. A cooling fan would struggle to meet the intake air volume at atmospheric pressure.
The static pressure of a cooling fan is less than 1lb.

Turbochargers are serious bits of engineering in a very small package.

 

[WebersCarts]

If you add a turbo and intercooler, your 28HP motor will run cooler than stock at 28HP.

This is from the book mentioned, but I didn't believe it until I confirmed it with my own measurements.



If you increase fuel 30%, it will probably run a little hotter than stock while running at the new full power of around 35HP.



If you run lower RPM for the same load after turbo conversion [by using a higher gear], exhaust temperature could be higher; or not. Assuming you keep your exhaust temp below 800C, the stress on the motor is lower than the higher RPM required to do the same work without the turbo.



A turbo-diesel motor has great response, like a gasoline engine.



Of course, you could just use a bigger NA engine; but then you don't get the high power bragging rights of the turbo golf cart.



Where are you located?

I am located in Wisconsin. Like I said above. I have one diesel golf cart and now I want a turbo diesel lol

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[DL-North]

X2

Turbochargers are serious bits of engineering in a very small package.

just curious, do you have source for cheep parts, or do you need to buy new at retail prices?

And have you done a search to see if there already are small diesels like that w/turbos?
Seems pretty small to have a turbo on.