QOTD: What Is The Largest Displacement Internal Combustion Engine You Have Operated?

BIG-engine

When this question popped into my head recently, I quickly realized there would likely be a delightfully broad spectrum of answers.

1975 thunderbird

The largest displacement engine I have owned was the 460 cubic inch (7.5 liter) V8 in my 1975 Ford Thunderbird. ย While defanged due to pollution controls, it still pumped out a terrific amount of torque and was simply unfazed my hills of any nature.

kenworth t800

As for operating, I briefly drove a Kenworth T-800 road tractor around my office complex one Friday afternoon. ย It was rated at 475 horsepower or thereabouts, so it’s likely in the 15 liter range.

So, what is the largest displacement internal combustion engine you have operated? ย Better still, what was it in?