GM Semis

[factorystock]

Originally Posted by Bob B.

We could have a pretty good discussion about what was wrong (and right!) with the Toro-Flow.

The improved version was the Toro-Flow 11. This article shows what was done for durability over previous versions. Maybe too little, too late?

[Bob B.]

Originally Posted by factorystock

The improved version was the Toro-Flow 11. This article shows what was done for durability over previous versions. Maybe too little, too late?

Possibly, but the new head gaskets and revised max R.P.M. governor setting addressed 2 issues the engine had. The Toroflow certainly had it's share of problems but so did most of the competitive mid-range diesels of that time, like the small Cummins V-6 and V-8's, the Ford Dagenham and Dorset, and the Internationals. In fact about the only reliable mid-range diesels back the 60's were the Detroit 53 series engines. A lot of the problems were caused by operator error. Engine overspeeding, poor quality fuel, improper maintenance, and overloading. Overloading was also caused in part by dealers, who would spec. trucks with a Toroflow to win fleet bids. Toroflow diesels were inexpensive compared to a lot of heavy duty diesels but equaled many larger diesels in H.P. and torque. Around the time the Toroflow II came out the engine was also dropped from the higher GVW trucks. Eventually the 220 H.P. DH 637 V-8 Toroflow was discontinued as well.

[C10 - C90 Bill]

Originally Posted by Bob B.

In fact about the only reliable mid-range diesels back the 60's were the Detroit 53 series engines.

Good 'ol Detroit.