Your Projects: Cramming a Semi-Truck Engine Into a Motorhome

By Colin Wood
Oct 29, 2020 | diesel, Cummins, Your Projects, Semi-truck, motorhome

Although potentially complicated, an engine swap can be a great way to get more power into your car. But what about a project involving something bigger—much bigger—like a motorhome?

Thankfully, forum user bearmtnmartin is finding that out so we don’t have to. The project in question: Replace the original diesel V8–only “210 smoky, wheezy horsepower” and around 450 lb.-ft. of torque–with a Cummins turbodiesel good for 425 horsepower and 1550 lb.-ft. of torque out a semi-truck.

So far, the semi-truck has been stripped down and its massive diesel straight-six removed, ready to be crammed into the limited space found in the motorhome.

To find out if the engine fits, and to see what life with a semi-truck-powered motorhome is like, follow along with the build thread over on the Builds and Project Cars Forum.

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View comments on the GRM forums
mad_machine (Forum Supporter)
mad_machine (Forum Supporter) GRM+ Memberand MegaDork
10/29/20 9:06 p.m.

those engines are smooth...

Vigo (Forum Supporter)
Vigo (Forum Supporter) MegaDork
10/30/20 9:08 a.m.

That is an awesome RV, but right now i could REALLY go for a tiny skid steer with pallet forks. heartheartheart

Paul_VR6 (Forum Supporter)
Paul_VR6 (Forum Supporter) Dork
10/30/20 9:26 a.m.

This stuff takes some next level lifting solutions. Last time I complain about my engines and transmissions!

MotorsportsGordon HalfDork
10/30/20 11:07 a.m.

Maybe I'm out to lunch but I think the only way this will work is if it's just the semi in engine in motorhome she'll cause  it would need one ridiculous lift to fit in my opinion. The semi engine has gotta be far taller then the v8.

bearmtnmartin GRM+ Memberand SuperDork
10/31/20 10:49 a.m.

Not sure this is a headline worthy project! And one of the reasons for the swap is to reduce the coal....

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