Engine Swaps

Ezra Birchard

New member

Equipment
Kubota B7510, brush hog, rotor tiller
May 16, 2022
3
1
3
15
Chehalis, Washington
Could I swap a Detroit 1-71 into my Kubota B7510? It would make around 30-40 hp, but since the tractor is designed for a 15-20 hp engine, would a more powerful one break anything?
 
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torch

Well-known member

Equipment
B7100HSD, B2789, B2550, B4672, RC54-71B, 48" cultivator, homemade FEL and Cab
Jun 10, 2016
2,195
434
83
Muskoka, Ont.
With enough money and time, anything is possible. But I doubt very much that it would be a straight bolt-in.

I don't think the B7510 has an external frame, so the engine is a stressed structural member. The thing you break could be the new engine unless you fabricate some sort of sub-frame to carry the loads.

Have fun and take pictures. Lots of pictures. We must have pictures!!!
 

Ezra Birchard

New member

Equipment
Kubota B7510, brush hog, rotor tiller
May 16, 2022
3
1
3
15
Chehalis, Washington
With enough money and time, anything is possible. But I doubt very much that it would be a straight bolt-in.

I don't think the B7510 has an external frame, so the engine is a stressed structural member. The thing you break could be the new engine unless you fabricate some sort of sub-frame to carry the loads.

Have fun and take pictures. Lots of pictures. We must have pictures!!!
No, it definitely wouldn't be a bolt-in job. Thanks for the information on the frame.
 

Dieseldonato

Well-known member

Equipment
B7510 hydro, yanmar ym146, cub cadet 1450, 582,782
Mar 15, 2022
532
293
63
Pa
The 7510 is the exact same as its 26hp (7610) the hydro will be just fine I would think.
 

PoTreeBoy

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Lifetime Member

Equipment
L35 Ford 3930
Mar 24, 2020
1,063
416
83
WestTn/NoMs
The 7510 is the exact same as its 26hp (7610) the hydro will be just fine I would think.
A 1-71 is closer to 25 hp than 40, I think. I can't imagine giving up a 61 cu in 3 cyl for 71 cu in 2 stroke! Gotta feeling sheet metal would have to go.
 
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Dieseldonato

Well-known member

Equipment
B7510 hydro, yanmar ym146, cub cadet 1450, 582,782
Mar 15, 2022
532
293
63
Pa
A 1-71 is closer to 25 hp than 40, I think. I can't imagine giving up a 61 cu in 3 cyl for 71 cu in 2 stroke! Gotta feeling sheet metal would have to go.
Yeah I wouldn't for a second.
 

Dieseldonato

Well-known member

Equipment
B7510 hydro, yanmar ym146, cub cadet 1450, 582,782
Mar 15, 2022
532
293
63
Pa
After reading that article I'm going to assume he does not have a 1-71 Detroit.
 

torch

Well-known member

Equipment
B7100HSD, B2789, B2550, B4672, RC54-71B, 48" cultivator, homemade FEL and Cab
Jun 10, 2016
2,195
434
83
Muskoka, Ont.
After reading that article I'm going to assume he does not have a 1-71 Detroit.
Yeah. Hiighlights include:
Weight: 875 lbs.
Power (Continuous) 15 HP @1200 rpm
Power (Max) 25 HP @ 1600 rpm
Lifespan above 1200 rpm: "minutes"
Fuel consumption: 1 gallon per hour @ 1600 rpm
Years of production: 1938 to 1940 (estimated)
Number produced: <1,000 (estimated)
Number of known survivors: 79
Current price on collector's market: "If you have to ask you can't afford it".

So, to answer the OP's original question: The first thing to break if you try to get 30 - 40 hp out of it will be the engine. The most economical solution would be to sell the 1-71 and buy a 30-40hp tractor with the proceeds. Take the bride out for a nice dinner with the change. :ROFLMAO:

But if he does do the swap, I still want pictures.
 
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Dieseldonato

Well-known member

Equipment
B7510 hydro, yanmar ym146, cub cadet 1450, 582,782
Mar 15, 2022
532
293
63
Pa
Bet he had an old lister petter.....
 

Ezra Birchard

New member

Equipment
Kubota B7510, brush hog, rotor tiller
May 16, 2022
3
1
3
15
Chehalis, Washington
I wasn't considering actually doing the swap, nor do I have the engine. I just wondered if it could work, or what would happen if it did. The more I've learned about them the less they make sense for anything other than a generator.