For those who’ve ever seen images of an interference engine that has been over-revved, you most likely suppose you recognize what catastrophic engine harm seems like. This 2021 Jeep Wrangler Rubicon’s engine bay completely redefines the idea.
This four-door seems completely nice from 10 toes away, as TikTok channel sbcsdime210 demonstrates in its walk-around, however what lurks beneath is a completely completely different story. The Drive caught up with the channel’s operator and acquired the main points behind this spectacular failure, and what we’re is the results of consumer error. This Wrangler was flat-towed behind an RV, which isn’t in any respect remarkable. Tragically, on this case, the motive force made the important mistake of leaving the Wrangler in gear. First gear. With the switch case in 4-low. I can hear a few of you groaning in sympathy all the way in which up right here in Michigan.
For those who’re not acquainted with the mechanical explanation why you completely don’t wish to do that, this is the brief model: The decrease the gear in an vehicle, the quicker your engine spins for a given street velocity. Purple line in first gear in a typical passenger automobile might be no larger than 30 to 35 miles per hour. Doing freeway speeds in first gear is just not attainable in most automobiles, this Jeep included. Actually, autos have had rev-limiters in place for many years to forestall drivers from by chance exceeding an engine’s rated working vary.
However with a handbook transmission, it is attainable to avoid this safety by shifting right into a gear too low in your journey velocity, as a result of with the automobile in gear, there’s a mechanical connection forcing the crankshaft to spin far faster than the rev limiter would in any other case permit. As you creep farther and farther previous redline, the chance of a failure will increase dramatically. In our above instance, a automobile that redlines at, say, 6,600 RPM (like this Jeep) would most likely be spinning near double that at 60 mph in first gear.
That alone can be sufficient to brick an engine, however what occurred right here was really worse than that. This Jeep wasn’t simply in first gear; it was in first gear with the switch case in 4WD Low, which multiples the engine RPM much more for a given journey velocity. For those who thought 12,000 RPM was unhealthy, effectively, 50,000 is sort of a bit worse. As you’ll be able to see, the result’s one thing akin to throwing a moist paper bag right into a twister.
On this case, the Wrangler’s engine was ripped to absolute shreds, and it took an excellent chunk of the transmission housing and several other surrounding equipment with it. Within the TikTok screenshot we included up prime, you are wanting up into two of the Pentastar V6’s cylinders. There ought to be an oil pan, a part of the block, extra of the crankshaft and two pistons the place we see nothing however a gaping maw as an alternative. We suspect it did a quantity on among the driveline elements that seem in any other case intact as effectively, however the engine bay scene is sufficient to make even a sturdy financial savings account head to the locker room early.
The lesson right here? When towing, learn the handbook and verify all the pieces twice.