Compound-Turbo 5.9L Cummins Powered Mercedes Unimog
We can confidently say that Jeff McCord of LinCo Diesel Effectiveness appreciates his way around a diesel engine. He’s made a identify for himself setting up some quite badass diesel engines for clients, a several of which have been showcased in our diesel of the 7 days collection in years prior. He also won our America’s Ideal (diesel) Motor Store award in 2021, has proven us the distinction involving a Mild and a Wild engine construct at his store, and given engine builders a load of handy academic material by means of our LinCo Lessons collection.
It would seem like he’s generally bought some thing cooking, and just lately he’s been no diverse. McCord arrived at out to us previous week to convey to us about a somewhat special challenge he just completed at the store – a specialised 5.9L Cummins motor he constructed for a custom 1965 Mercedes Unimog multi-purpose truck.
The car alone is relatively unique, but even a lot more so are the circumstances it will be pushed in. The Unimog is being built by Craven Effectiveness for a shopper who owns a non-public ski-ranch in central Colorado. The ~$500,000 truck will be working from close to 6,000 to 11,500 ft. in elevation. We’ll have to hold out until finally this year’s SEMA show to get a proper search at the cab, but McCord currently has the motor crafted up and completely ready to dive into.
Remaining that it will be operating at these superior altitudes, the initially issue to look at was the skinny air the Cummins would be working at. For that motive, the staff at LinCo decided on a 5.9L bored .040” over alternatively than a 6.7L to maintain the displacement minimal and ran 01’-02’ 24 valve superior-output forged pistons.
“Those have the best compression of any manufacturing unit piston,” McCord mentioned. “We required the greatest static compression since of the altitude it will be running at, so she’ll be place about 17.2 to 17.5:1 for the compression ratio. And we utilized a Hamilton 178/208 camshaft for the performance in the reduced-conclude torque since this factor will be want to continue to keep momentum climbing up some deep packed snow. It is a metal camshaft that we line bored and set cam bearings all the way through.”
The motor has a Beans Equipment 12mm girdle, it was line honed and decked, and offers LinCo’s personal LDP Reman head with stock-dimensions Inconel valves. D&J 115 lb. valve springs with titanium retainers retain the valves closed.
It also options Overall Seal gapless rings, Clevite H-sequence bearings, a Fluidampr balancer, a Kingspeed billet timing deal with and ingestion horn, LDP’s 6.7L-design billet consumption plate, and a Jegs Electrical h2o pump.
“It’s received Boostline solid connecting rods in it, a factory 5.9L crank that’s been keyed and balanced, Hamilton pushrods, Fleece billet valve bridges, a Cometic MLX head gasket, and ARP .625 head studs.”
On the air aspect of issues, McCord went with a Diesel Electric power Source Turbonator, which is a mechanical, variable geometry turbine housing.
“The travel stress essentially moves the veins, so when all the things is closed and there is no drive pressure applied to the actuator, it is like a .50 AR ratio. So, a super limited housing that spools fast. And then as drive pressure builds, it pushes on the wastegate actuator head and works the veins just like an electronic actuator would. It regulates itself off generate, and it’s fantastic for this set up.”
The entire setup took a bit of engineering to get every thing proper, but a Turbonator mechanical VGT housing on a DPS t3 manifold was finally resolved upon. Paired with the Turbonator housing is a 5-blade 362.68 substantial strain charger. For the atmospheric, it is a Stainless Diesel-designed 5-blade S480.93 with a 1. T4 housing in an hard work to hold every little thing as limited-spooling as doable.
As significantly as fuel goes, S&S spec’d out the overall set up. The workforce went with 200{49e09b23eae7466ccc7574c19ebb3019301c9a11d2999feff81a3526451546a5} above injectors, a 12mm CP3 pump, and a 6.7L fuel rail, sensor and aid valve.
The Cummins powerplant has not been dyno’d nonetheless, but McCord expects the engine to make 1,200 horsepower, or all around 600 horsepower in the altitude and operating problems it will be functioning in. Paired with a 6-pace Allison transmission, this beast will have far more than more than enough ability to have its passengers up the ski slope.
To see the concluded products, make guaranteed to quit by the Craven Effectiveness booth at this year’s SEMA present!
Diesel of the 7 days is sponsored by AMSOIL. If you have an motor you’d like to highlight in this series, be sure to email Engine Builder Editor Greg Jones at [email protected]
