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[V6 Performance]
GMC Diesel Engines
GMC’s TORO-FLOW V-6 DIESEL ENGINE
The GMC TORO-FLOW Diesel Engine, was basically the gas V6 engines converted to a Diesel. I
have not heard vary many good reports about these engines. Most ended up replaced by a Gas
powered V-6 or V-8. They also built a 637 V-8 Toro-Flow Diesel Engine.
Toro-Flow Engine Specifications
|
Engine Model
|
Gross Horsepower |
Net Horsepower |
Gross Torque lbs. ft. |
Net Torque lbs. ft. |
Bore – Stroke |
Displacement |
Compression |
Notes |
|
D351 V6
|
130 @ 3200 rpm |
~ @ 3200 rpm |
~ @ 2000 rpm |
~ @ 2000 rpm |
4.56″ – 3.58″ |
351.2 cu. in. |
17.5 to 1 |
|
|
D478 V6
|
150 @ 3200 rpm |
135 @ 3200 rpm |
275 @ 2000 rpm |
266 @ 2000 rpm |
5.125″ – 3.86″ |
477.7 cu. in. |
17.5 to 1 |
|
|
DH478 V6
|
170 @ 3200 rpm |
155 @ 3200 rpm |
310 @ 2000 rpm |
298 @ 2000 rpm |
5.125″ – 3.86″ |
477.7 cu. in. |
17.5 to 1 |
|
|
DT478 V6
|
220 @ 3200 rpm |
|
|
|
5.125″ – 3.86″ |
477.7 cu. in. |
17.5 to 1 |
1 |
|
D637 V8
|
195 @ 2600 rpm |
185 @ 2600 rpm |
450 @ 1800 rpm |
440 @ 1800 rpm |
5.125″ – 3.86″ |
637.0 cu. in. |
17.5 to 1 |
|
|
DH637 V8
|
220 @ 2800 rpm |
200 @ 2800 rpm |
458 @ 2000 rpm |
444 @ 2000 rpm |
5.125″ – 3.86″ |
637.0 cu. in. |
17.5 to 1 |
|
1.
Twin Turbo Setup.
GM’s 6V-71 DIESEL ENGINE
6V-71 DB-Model / 6V-71 DF-Model
The BEST DIESEL ENGINE ever built was the Detroit Diesel. Why GMC ever built the
Toro-Flow when this engine was around is a mystery. Chevy use the Smaller 53 series in
their trucks, but GMC when with the 71 series. The series number is the cid of each
cylinder, so a 6V71 would have a displacement of 426 inches. These engine could take the
abuse and that is why you seen them in City Buses, Garbage trucks, and Firetrucks.
Detroit Diesel Engine Specifications
|
Engine Model
|
Gross Horsepower |
Net Horsepower |
Gross Torque lbs. ft. |
Net Torque lbs. ft. |
Bore – Stroke |
Displacement |
Compression |
Injectors |
|
6V-53N
|
195 @ 2600 rpm |
185 @ 2600 rpm |
447 @ 1400 rpm |
439 @ 1400 rpm |
3.875″ – 4.50″ |
318.4 cu. in. |
18.7 to 1 |
~~ |
|
6-71NE or 6V-71NE
|
195 @ 1950 rpm |
187 @ 1950 rpm |
570 @ 1200 rpm |
557 @ 1200 rpm |
4.25″ – 5.00″ |
425.6 cu. in. |
18.7 to 1 |
N55 |
|
6-71N or 6V-71N
|
218 @ 2100 rpm |
209 @ 2100 rpm |
604 @ 1200 rpm |
591 @ 1200 rpm |
4.25″ – 5.00″ |
425.6 cu. in. |
18.7 to 1 |
N60 |
|
6-71N
|
238 @ 2100 rpm |
229 @ 2100 rpm |
650 @ 1200 rpm |
636 @ 1200 rpm |
4.25″ – 5.00″ |
425.6 cu. in. |
18.7 to 1 |
N65 |
|
8V71NE
|
260 @ 1950 rpm |
249 @ 1950 rpm |
761 @ 1200 rpm |
731 @ 1200 rpm |
4.25″ – 5.00″ |
567.5 cu. in. |
17.5 to 1 |
N55 |
|
8V71N
|
290 @ 2100 rpm |
275 @ 2100 rpm |
805 @ 1200 rpm |
774 @ 1200 rpm |
4.25″ – 5.00″ |
567.5 cu. in. |
17.5 to 1 |
N60 |
Information About GMC Truck Drive Trains
 GMC Big Block V6 |
1960-1966 |
|
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© 2000-2008 6066 GMC Trucks. Last Updated July 23, 2008.