![]() ![]() A lower compression ratio reduces the combustion flame temperature, which significantly improves piston and head gasket durability.Īn intercooler was then installed to reduce the charge-air temperature generated from a sustained boost pressure of 15 psi. Ford and Dodge diesels were already equipped with 17.5:1 pistons, where the original 6.5 pistons were at 21.3:1. These lower compression ratio pistons make it possible to safely increase boost pressure and fueling. The process of modifying the 6.5 began by fitting a set of Peninsular Engine's 18:1 compression ratio pistons. The concept for this project truck was not about creating a "hot-rod", or a touchy or hard-to-manage engine, but rather give it the same levels of boost pressure, fueling and engine cooling used by Ford and Dodge, then see how the 6.5 compares. After driving this truck more than seven years and 250,000 miles, I believe we've answered this and many other questions concerning power, performance and durability for a performance-modified 6.5L Turbo Diesel.īoost pressure, fuel and engine cooling are the three main ingredients that determine diesel engine power. The question we hoped to answer with this project back in 1997-99 was whether a properly equipped 6.5TD could provide towing performance comparable to a " stock" 1999 model-year 7.3L Ford Powerstroke and Dodge ISB Cummins. At the time this series began, Ford & Dodge set the standards for diesel towing power, and many 6.5 owners were looking for ways to improve the towing performance of their GM trucks. Note: The 6.5TD Power Project series began in late 1997, and was completed by mid 1999. This and other performance tests have proven that the 6.5 could compete while pulling heavy trailers, and could easily outrun a stock 1999 Ford & Dodge while running solo. In 1999, we compared a properly equipped 6.5L Turbo Diesel to both a stock 1999 Dodge ISB Cummins and Ford Super Duty Powerstroke during our first annual Pull-Off, which included a 10,000-lb trailer and a 6% grade. That being, if you added the right equipment, the 6.5TD could provide competitive levels of performance. ![]() 5TD Power Project came from this same thought process. They immediately said that with modifications, their trucks could equal a " stock" Duramax 6600 powered GM pickup truck. The Duramax 6600's arrival in the fall of 2000, with its class-leading power and torque, created quite a buzz among Ford and Dodge owners. ![]() 6.5L Turbo Diesel Power & Performance Project ![]()
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