KEEP­ING ON

Diesel World - - Jim Bigley -

Hello Diesel World, I have been a reader for a while now and have re­cently pur­chased my first diesel... a 1993 Chevro­let 4x4 with a 6.2L diesel en­gine. I know that the 6.2L diesel is not in the same league as the new trucks, even though it has quite a few miles on it, the en­gine still starts very well, runs smooth and the over­all truck is still in great shape. But, I use the truck to com­mute 5 days a week, so fuel econ­omy is im­por­tant, but I would also like to im­prove the truck’s tow­ing per­for­mance a bit. Please let me know where to start! Thanks! Win­ston Guild

Wil­liams Lake, BC Canada Hello Win­ston, Wel­come to the Diesel World! 1993 was the last year for GM’S 6.2L diesel en­gine. Some

In­ci­den­tally, GM used the very same cylin­der block cast­ing for both its 6.2L and 6.5L diesel en­gines dur­ing the 1992-93 model years. The 6.2 just used smaller pis­tons. So, this means the 1992-93 6.2 can be bored to a 6.5, when the time comes to re­build the en­gine. Good luck.yes, the 305 is still a great en­gine, and has a lot of po­ten­tial. Thanks for writ­ing. There’s ac­tu­ally a lot you can do to im­prove per­for­mance, and for not a lot of money. A tur­bocharger has al­ways been at the top of the list when con­sid­er­ing power im­prove­ments for the 6.2L, and you can in­stall all of the fac­tory turbo-re­lated com­po­nents used in the 1992-99 GM 6.5L turbo diesel pow­ered pick­ups and SUVS. Th­ese parts are easy and cheap to find, and they’ll bolt right on with­out any mod­i­fi­ca­tions. With 7-10 psi boost pres­sure and a mi­nor fuel cal­i­bra­tion in­crease (that you can do your­self), the en­gine should pro­duce up to ap­prox­i­mately 180-horse­power and 360 lb-ft of torque. This is a big per­cent im­prove­ment. If you run at typ­i­cal free­way speeds, your truck’s fuel econ­omy shouldn’t be af­fected, but you will see a big im­prove­ment in per­for­mance. things to keep in mind when dis­cussing the 6.2 is that it was de­signed pri­mar­ily as a fuel econ­omy en­gine, and hav­ing just enough power to do what most peo­ple needed to get done. In 1993, the non­tur­bocharged 6.2L diesel was fly­wheel-rated at about 155-horse­power and 275 lb-ft of torque.

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