Engine Hoist Mount

[monteboy84]

You do realize that those are only 5/16-18 studs going into soft aluminum, right? I totally agree that a 5/16 hard bolt times 4 is strong enough. I'm just not so certain that there is enough meat on a 5/16 standard aluminum thread pulling straight up. That's the weak point - not the bolt.

Yup, I understand that, I'm a mech draftsman by trade so I have to deal with this stuff on a regular basis. I haven't run the numbers, but by rough estimate you could lift the entire car by those 4 5/16" bolts threaded into aluminum. I realize that it's fairly easy to strip an aluminum bolt hole with a torque wrench, but the shear stress on the threads is pretty severe when over-torquing, versus the the 1000 lbs (rough, high estimate) placed on the four them by an engine/trans combo. Sorry, not meaning to hijack, it's just something I find interesting.

I've always just used a chain diagonally over the intake to bolts in the heads, but I've helped others lift motors in and out with a plate many times without an issue.



-matt