Supporting engine by the supercharger

[drag racer]

Not saying to do it, but the math doesn't lie. R&R'd 650 lb BBC in my race cars numerous times over the years with only the 4 carb bolts on the intake adapter...

 

[Unholy707]

Not saying to do it, but the math doesn't lie. R&R'd 650 lb BBC in my race cars numerous times over the years with only the 4 carb bolts on the intake adapter...

That’s what I’m saying

 

[1971demon]

This is ONLY an exercise in BAD academics. DO NOT USE THIS FOR DETERMINING THE VIABILITY OF ACTUALLY LIFTING THE ENGINE ASSY BY THE S/C.

I strongly do NOT recommend this. If Dodge does, that's their literal business, I do not know all of the factors involved, they do.

ASSUMPTIONS - AND BAD ONES AT THAT.

• That the bolt is stronger than the pull-out force of the threads (it most certainly is, but...)
• 10mm thread depth
• 8mm bolt
• threads in optimal condition, both thread percentage (75%) and overall condition.
• 270Mpa aluminum material strength (this is one of the bigger assumptions)
• thread shear efficiency factor of .577

270Mpa * .577 * 8mm * pi * 10mm = ~39,134N

39,000N / 9.8 = ~3980kg

3980kg * 2.205kg/lb = 8775lbs pullout (which is the better approach than clamp load I stated originally)

So, academically, the pullout force, per bolt is 8775lbs. BUT this is a grotesquely bad way of thinking about the system of lifting the engine assy by the the S/C.

Again, if Dodge has blessed this method, that's their deal.


.02, and a bad .02 at that!



(Did I qualify that post enough times? I did so not so much for this thread now, but in the future when somebody else stumbles onto this thread and takes it out of context.)

 

[1971demon]

That’s what I’m saying

see what you started

 

[Unholy707]

Just a healthy debate with (some) people smarter than me 😅

 

[BULL]

Just a healthy debate with (some) people vaguely more exposed to machining, as well as nuts and bolts than me 😅

 

[2ndgen]

Now I want to set up a piece of scrap aluminum with a 8mm bolt and test it on my shop press to see what the actual fail point is...

I'd love to watch that video.

 

[1971demon]

Just a healthy debate with (some) people smarter than me 😅

Why you leavin out JimmieN..

 

[1971demon]

I like Holy Guy's post better

 

[BULL]

I'd love to watch that video.

Challenge accepted, but it won't happen for a bit

 

[1971demon]

Challenge accepted, but it won't happen for a bit

Hell...I wanna see it too....5 bucks says fail point..earlier than expected

 

[GNBRETT]

terrible idea bro

 

[45-70govt]

A new topic coming soon to a Hellcat forum near you!

 

[Jack_Toepfer]

If it just clamps on to the supercharger - I wouldn’t do it. You’re trusting your baby to friction and clamping force, not the threads of a bolt designed to hold things in place. If it’s attached to the blower using the blower bolts, the thread depth of Bull’s calculation has to be reduced by the thickness of the clamp material. 10mm goes to shit if it’s 1/4” material but per the calculation it’s a little less than 1/2 the capacity… but I don’t trust an 8mm coarse thread bolt with 4mm of engagement - especially in a head cast in Mexico with a bolt made in China.

Lifting a BBC out of an engine bay by a carb plate uses 1/4” bolts, but mine are usually 1” long… The bolt can take it, as can the depth of the threads. Turn that bolt in 3 turns instead of 30, and you’re asking for trouble.

 

[Unholy707]

WTB : new or use cylinder heads

 

[1971demon]

WTB : new or use cylinder heads

Let me guess...you fucked up yer heads liftin the motor

 

[Unholy707]

Nope just having some fun

 

[1971demon]

Nope just having some fun

C'mon...lets tell everybody ya fucked it up big time..so I can hammer ya bout bein a Melon head

 

[BULL]

I'd love to watch that video.

I prepped the test piece, I'll work on shooting a video tomorrow maybe.

 

[Unholy707]

For science!