50,000 RPM Jeep 3.6
- Thread starter Weather Man
- Start date
Holy hell
Years ago I knew a guy that had a local shop. An old couple brought their Jeep in because it wouldn't go into gear. Turns out they left it in park when they towed it behind their motorhome. Tore up the diff and trans. Guy said when he opened them up the pieces fell out.
Any insurance guys think he could claim that?
That’s going to be costly! I remember a 250 that came in at the dealer that blew up his transfer case. He was driving in 4hi all the time.
Time for a full hemi swap
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I doubt it. Unless you could conceal the fact of what caused it but that is unlikely.
I say the crank left the room at 12,000.
His math is a bit off probably, but it’s still crazy.
An auto has a 4.71 first coupled with the 2.72 low range and I chose the middle ground 3.73 (3.45 & 4.10 are also options) and that put it at ~34,000 rpm at 65mph. Worst case scenario with a manual first gear of 5.13 in low range with the 4.10 rear puts you at 50,000rpm at 80mph so I guess it’s possible. This is all calculated using a 31” tire.
Ninja edit* Just saw it was Rubicon so figure 33” tire which will lower the rpms a bit. Still agree that the crank/block exited stage left very early in the process before it ever saw those rpms.
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Recalculate, the Rubicon comes with a 4:1 low range.
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Did not know that, guess it started in ‘18? In that case 50k would be 70mph with 3.73 and 64mph with the 4.10.
Either way it is a moot point as there is no way the engine ever saw even remotely close anything over 10k-12k as stated earlier. Rod bolts, rods, wrist pins or crank probably let go somewhere before 10k I would bet after the valves had floated for a few and beat the hell out of the pistons. If it could have held on them theoretically it could achieve such speed I guess.
Now we find the gram weights and calculate rotational mass versus tensile/stretch/shear values and we’re getting somewhere. I’m sure stocks specs are absurdly low in comparison to what it would have to endure.
thats ****ing hilarious/impressive
Rubicons have had the Rock-Trac 4:1 transfer case since the model debuted on the TJs. All have 4.10 gears too.
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I honestly had no idea, I knew they had a stronger t-case but not a 4:1 and that comes from owning one though my TJ was only a 4 banger. I am definitely not a Jeep efficianado.
LS/GM trans swap, some 1 ton axles...call it done
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