4-71 h.p. & torque

[jkh]

just to settle a discussion, does anyone know the h. p. and torque of a detroit 4-71. thanks

 

[Rosco]

Not sure but it may depend on the application it was used in and also the model year.



I used to operate a 15 ton crane and a 100 ton travellift that had 4-71's and as usual for those Detroit's they were loud.

 

[jrobinson2]

I've been told the rule of thumb on inline 71s is 35 HP and 100 FP torque per hole, that would be 140 HP and 400 FP. My book only lists 6-71s and 6V-71s, the 6-71s range from 201/552 to 260/751. I would think the 4-71s would come in several different ratings also.

Jared

 

[Camara]

The naturally aspirated 6-71 is 238 HP. I forget the torque.

I operate a machine that has a 4-53 in it and it it 120hp. But I also agree with Rosco it depends on the application. I have seen a 2-71 in a B20 Bucyrus Erie Cable Backhoe. Cutest little green engine I ever saw.

 

[Rosco]

I made an error in my above post. The cranes I ran had 4-53's in them.

 

[tgbol]

A member of my car club races a toyota cab with a 4-71 mounted behind the cab at Bonneville. It is Turboed inter-cooled blown and after-cooled. He claims 675 hp. Only problem is it keeps melting pistons.