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Memories for us old truckers

Truck Shop

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The 6-71 inline was detroits main stay for day cab city delivery trucks starting in the late 40's early 50's. But those were gutless wonders. But GM offered them cheap to manufactures so dealers had leverage to work on cost of new trucks.
 

Truck Shop

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Ford, GMC, Chevy, Pete, KW, Wester Star all had Detroits in their engine line-up, the main being the 8V71 because of hp rating of 318 which wasn't far off from the 335/350 Cummins and Cat 1673 @325 hp.
But GM/Detroit would sell to manufactures $500 to $750 less per engine. The Cat 1693 was looked at as a owner/operator spec engine at 425hp, same with the 12V71 and Cummins KT/KTA 450 thru 600 hp
engines. When Detroit came out with the double OO 8V92 it put out power but was nothing more than a 8V71 block and rods punched to accept 92 liners. The 71 main caps did not have enough material
to handle the horse power and main caps cracking was a real common problem. Then came the Silver 92 with redesigned block and heads but because the double OO series had a bad reputation it didn't
sell well till Detroit threw a 200,000 mile warranty at it, then sales took off. Plus Detroit re-rated it to 475 hp which caused owner operators to take a second look. But even with all that said it made a terrible
engine for on highway use. It's a two stroke and those don't like to be idled plus those engines don't like constant rpm swings or to be pulled down and run at lower rpms. Those engines will last and perform
much longer with constant high rpms. Years ago talking with a Detroit rep the on road rated two strokes were designed/planned to burn a gallon of 30-40 wt every 3,000 to 3,500 miles.

Remember slam your hand in the door Cowboy!
 

Birken Vogt

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Nov 30, 2003
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Grass Valley, Ca
Detroit threw a 200,000 mile warranty at it, then sales took off. Plus Detroit re-rated it to 475 hp which caused owner operators to take a second look. But even with all that said it made a terrible
engine for on highway use.

I always figured they burned a lot more fuel too, but you surely know better, how was the comparative fuel economy of the 318 vs the Cummins and/or Cat?
 

DMiller

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Hermann, Missouri
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Cheap "old" Geezer
Concrete companies here preferred the 6Ls for weight.
Did not care were slow as could add more materials to a load. Old Eucs at the quarries were dependable starters even in severe cold, again not fast just hauled a lot of materials. Fuel consumption until the 70s was not a concern, do not believe I ever knew of a 318 that got better than 4.5-5mpg. In river service they could slobber along and no one seemed to care.
 

DMiller

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Hermann, Missouri
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Cheap "old" Geezer
The old Caddy's were a score for many industrious types, V12, major HP, built strong as any truck was. Was noted in a friends family memories that his Dad and Uncle bought them on the cheap as people lost everything during the Depression and would convert to wrecker or dump/straight truck. His Dad had a 1930 business coupe and made it into a concrete work form truck, his Mom developed Dementia and burned all the family photos/memories/records one day as she did not know whose they were thinking just trash.
 

Truck Shop

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8v71 vs 350 Cummins----Two more cylinders fires every time the cylinder comes up more moving parts running at a higher rpm= poor fuel mileage plus less power.
 
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