When did the Toro flow d478 come out?
When did the Toro flow d478 come out?
Here’s a D478 V6 for a medium-duty application from around 1968. You will have noted by now that the intake and exhaust manifolds are on the same outboard side of the head. It may seem strange on a narrow-vee engine, but was necessary to make room for the injection pump.
When did the Toro flow diesel engine come out?
Introduced in 1964, the Toro-Flow was the answer, but it had some baggage. The development process for a four-stroke, low-cost diesel began in 1953 and was eventually synchronized with the development of a new 60-degree V6 gasoline engine to be introduced for 1960. This is not to say the diesels would be “converted gas engines.” They weren’t.
Is the Toro flow 637 the same as a diesel?
A funny sideline to the D637 V8 is that the ’67-72 637 gasser was, in many ways, a converted Toro-Flow 637 diesel with a lower compression ratio and a carburetor. The combustion chamber was in the piston, like the diesel, and the heads were flat like a diesel. The narrow 60-degree vee is apparent here and illustrates why the manifolds are outboard.
What are the problems with the Toro flow?
The Toro-Flow has a rather notorious reputation and is known for two main problems, the American Bosch PSJ injection pump and head gasket failures. The word from back in the day was that regular head re-torquing eliminated most problems relating to head gaskets.
Here’s a D478 V6 for a medium-duty application from around 1968. You will have noted by now that the intake and exhaust manifolds are on the same outboard side of the head. It may seem strange on a narrow-vee engine, but was necessary to make room for the injection pump.
When did the GMC Toro flow come out?
The Toro-Flow diesels debuted in 1964 in two displacements, 351 ci (the D351, 130 hp) and 478 ci (D478, 150 hp). A high-output model was also offered, the DH478, cranking out 170 hp. It’s been reported that GMC toyed with the idea of a diesel 305 V6 in the light trucks but it isn’t clear how far the idea went.
What’s the max rpm for a Toro flow diesel?
Max full-load rpm was 3,200 for the V6 engines, 2,600 rpm for the D637, and 2,800 for the DH637. There isn’t a whole lot to dislike here, at least on paper: fourbolt mains, a chrome-nickel alloy block and six bolts per cylinder to tie the head down.
How did the Toro flow engine get its name?
The “Toro-Flow” name was derived from the engine’s toroidal combustion chamber action, designed to induce a swirl to better mix the air and fuel. The Toro-Flow engines were all narrow 60-degree V-type engines and could be built with both right- and left-hand rotation. Both the V6 and V8 Toro-Flows used balance shafts.
