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Pocketmags Digital Magazines
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Pocketmags Digital Magazines

DE-STROKED DURAMAX

THE INNER WORKINGS OF AN LMM BUILT TO LIVE AT HIGH RPM

We see a lot of engines go together here, at Diesel World, but occasionally, we’re able to sit in on a high-horsepower build that breaks the mold.

After playing a key role in keeping as many as seven pulling trucks operational during the summer, Kevin Dermody of Dermody Diesel didn’t settle in for a long winter’s nap once the weather in his native Illinois turned cold. Instead, he found himself busy indoors, piecing together a fairly unique combination of parts for a power-hungry Duramax owner. It wouldn’t be a big-bore engine or a stroker; rather, it would be a de-stroked LMM designed to live at high rpm.

Having been around big-bore and stroker versions of the 6.6L in the past, Dermody was accustomed to sizing turbochargers for stock or increased-displacement engines.

Needless to say, turbo selection presented a new challenge for a high-rpm screamer. First and foremost, Dermody wanted chargers that wouldn’t run out of steam at 3,500 rpm. However, he needed them to be reasonably responsive at low rpm.

Beyond turbo selection, Dermody would enlist the help of some of the biggest names in the industry, with companies such as Wagler Competition Products, Diesel Technology Source, S&S Diesel Motorsport and HSP Diesel all coming onboard.

For a look at the complete build sheet behind this shortstroke, 390 ci Duramax’s somewhat unorthodox route to making power, keep reading.

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