These unbalanced forces multiply as engine speed increases and cause not only vibrations, but also crankshaft wobble that damages main bearings.
An unbalanced engine has torsional vibrations or harmonics. It is a well known fact that the smoother an engine runs the longer lasting and more efficient it will be.
#6.5 turbo diesel engine torque specs crack#
There is another crack not quite as visible, can you see it? In this photo, one of the cracks is highlighted and enlarged. Colored iron filings are attracted to the cracks. We have sold hundreds of these rebuilt 6.2L engines to replace 6.5L and I have never had a customer complain about a loss of performance.Īn electromagnet (A) is used in a process called magnafluxing to reveal cracks in the block. As long as the same fuel and turbo systems are used, I would say that the seat-of-your-pants performance of a 6.2L and a 6.5L is identical. With diesel engines, most of your performance comes from the amount of fuel and air that goes into the engine. In our experience, this slight loss of volume does not sacrifice engine performance. We figure that Ted’s hybrid engine ended up with approximately a 6.35 liter displacement. 020 oversize, we did lose some engine displacement versus a true 6.5 L diesel engine. By starting with a 6.2L block and boring it. 080 smaller in diameter than a standard bore 6.5 L diesel engine. Ultimately, the block ended up 0.020 inches over on the bore with 0.004 inches taken off of the deck surface.Ī standard bore 6.2L engine is. We made sure that the deck heights on both sides of the block were as close as possible. In order to prepare the block, we cleaned, magnetic particle inspected (magnafluxed) for cracks and checked line bore distortion as well as torque plate boring and honing, surfacing the deck to even the deck heights (square decked). My thanks to Ted, he allowed me to use my imagination and to utilize some relatively new and exciting technologies to achieve our goals. Durability Diesel Depot – with our 10 years of experience building these engines for a wide range of applications from mild to wild – accepted Ted’s challenge and began this unique engine build. A few extra horsepower wouldn’t hurt, he said, but sheer power definitely was not his aim. Instead of buying a new Duramax replacement, Ted challenged me to build the most durable, smoothest running and efficient 6.5L Chevy diesel engine that I could imagine.
Unfortunately, after about 150,000 miles of happy service, his engine failed. He had spent a lot of effort and money over the years getting it built up exactly like he wanted. Ted, like many of you, is a GM diesel enthusiast who loves his truck. A while back, Ted Rich, of Granite Falls, Washington contacted me about a rather unique 6.5 Chevy diesel engine build for his 1998 Chevrolet 3500 4x4 dually truck.
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