Two Piece Crank--440 go BOOM!

Posted By: Anonymous

Two Piece Crank--440 go BOOM! - 01/31/15 04:23 AM

OK you know that a 727 will take out your 8 track if you do burn outs in first with a manual valve body--Right? The sprag fails and BOOM! I have done it--most Mopar racers have done ONE--but then we learn--OK..here is what happens when 727 explodes--shoves engine into radiator--this 440 was finished and sent out a few weeks back--it ran GREAT! Made some good HP with Sidewinders and .509 ( yea..the ole good one) during recent burn out "stunt" trans goes Pow! and customer advises engine has a tight spot now--OK bring it and we will look--HOLY SMOKES!! Yanked the pan and here is what we found

Posted By: Anonymous

Re: Two Piece Crank--440 go BOOM! - 01/31/15 04:25 AM

Yikes!!

Posted By: slammedR/T

Re: Two Piece Crank--440 go BOOM! - 01/31/15 04:27 AM

Posted By: Anonymous

Re: Two Piece Crank--440 go BOOM! - 01/31/15 04:29 AM

Guessing this ain't covered under warranty

I have seen some wild ones but this is one for the record book. Trans exploded so hard it shoved engine through the radiator and did not do the rest of the car any favors either--Engine would still turn but was a little tight--crank was magged a few weeks before this by me and was AOK
I guess the sudden stop got her

Posted By: Anonymous

Re: Two Piece Crank--440 go BOOM! - 01/31/15 04:31 AM

Got me a new door stop for the shop

Posted By: 451Cuda

Re: Two Piece Crank--440 go BOOM! - 01/31/15 05:10 AM

Quote:

OK you know that a 727 will take out your 8 track if you do burn outs in first with a manual valve body--Right? The sprag fails and BOOM! I have done it--most Mopar racers have done ONE--but then we learn--OK..here is what happens when 727 explodes--shoves engine into radiator--this 440 was finished and sent out a few weeks back--it ran GREAT! Made some good HP with Sidewinders and .509 ( yea..the ole good one) during recent burn out "stunt" trans goes Pow! and customer advises engine has a tight spot now--OK bring it and we will look--HOLY SMOKES!! Yanked the pan and here is what we found

"engine has a tight spot"

Posted By: Project kickin A

Re: Two Piece Crank--440 go BOOM! - 01/31/15 05:14 AM

bearings will go again lol

Posted By: dakotawilly

Re: Two Piece Crank--440 go BOOM! - 01/31/15 07:14 AM

ive seen a steel ford crank do that, but never a mopar big block.and the occasional cast sm block stroker crank.but thats what them sm block guys get when they race with a 300 dollar crank.thats one place i never buy cheap,i use winberg.they are truly a work of art..

Posted By: Polarapete

Re: Two Piece Crank--440 go BOOM! - 01/31/15 07:42 AM

I spun a rod bearing in a 426 wedge and it ran but would not idle

My fault, I just got the car and it was low on oil

Unfortunately that is the hard way to learn, but you never forget. Every time I break something I learn something new.

Posted By: CTD5.9

Re: Two Piece Crank--440 go BOOM! - 01/31/15 08:13 AM

did it run still? had an big block mopar irrigation pump do this once, it ran........terribly with the worst noises ever but it ran.

Posted By: slantzilla

Re: Two Piece Crank--440 go BOOM! - 01/31/15 09:19 AM

Quote:

did it run still? had an big block mopar irrigation pump do this once, it ran........terribly with the worst noises ever but it ran.

I looked at a '70 383 Roadrunner that had a broken crank and still ran. Sounded like somebody was in the pan hitting the block with a big hammer.

Posted By: MR_P_BODY

Re: Two Piece Crank--440 go BOOM! - 01/31/15 03:53 PM

I have a crawler-loader that has a 4 cyl diesel in
it... I broke the crank in it right under the #2 main
bearing.. I did it twice the same way.. it would just
loose power and a minor knocking... the main thing
it was a MAJOR PITA to get it fired up.. basically
it turned into a 2 cyl engine... I found out later
that the previous owner blew the head off the engine
using starting fluid.. I believe he cracked the crank
and bent the block

Posted By: Crizila

Re: Two Piece Crank--440 go BOOM! - 01/31/15 04:34 PM

Quote:

Got me a new door stop for the shop

I used to have a "conversation shelf" in my office with stuff like that on it. Was he running a motor plate or conventional motor mounts? His 8 track still work??

Posted By: roadhazard

Re: Two Piece Crank--440 go BOOM! - 01/31/15 05:45 PM

Quote:

Yikes!!

It's obvious..... the wrong pan gasket was used

Going to save and re-use that rear seal?

Posted By: gofastboater

Re: Two Piece Crank--440 go BOOM! - 01/31/15 09:13 PM

I once got a Coronet wagon with a 360 with a motor noise. Didn't figure it out until it wouldn't move. Crank broke on an angle between the #6 rod and the 4th main. It would start and run ok. The flexing of the crank finally broke the flex plate.

Posted By: Porter67

Re: Two Piece Crank--440 go BOOM! - 01/31/15 09:35 PM

OK you know that a 727 will take out your 8 track if you do burn outs in first with a manual valve body--Right?

Should of built the complete trans to match the motor.

Posted By: sasquatch

Re: Two Piece Crank--440 go BOOM! - 01/31/15 10:57 PM

Trans was not our doing. The new one is. Well known brand three letters TURNS to CRAP INSTANTLY. New trans has a proper Griner Low band apply valve body and good guts.
Motor mount was elephant ear type.
The motor shut off instantly when it popped. Barely nicked the rod. COULD easily been a total loss.
Todd

Posted By: 70Dustmite440

Re: Two Piece Crank--440 go BOOM! - 02/04/15 03:03 AM

Dang!!!!!!!!!!!
.
.
.
.
I still start my burnout in first, either i'm too old to change my ritual or my engines are too weak starting in second... or both

Hi guys

Posted By: pittsburghracer

Re: Two Piece Crank--440 go BOOM! - 02/04/15 04:17 AM

I even start my powerglide burn-outs in 2nd gear.

Posted By: 70Dustmite440

Re: Two Piece Crank--440 go BOOM! - 02/04/15 06:14 AM

Maybe I'll give it a try.

Posted By: Anonymous

Re: Two Piece Crank--440 go BOOM! - 02/04/15 02:12 PM

727 burn outs-
Always start in 2nd--quick shiftto 3rd gets wheel speed up fast and the sprag is safe do one in first and when the wheels hit dry and chirp that sprag gets Whammed!!! Sooner or later it fails--it is press fit into case and has a small set screw to keep it from spinning--the bolt ins are a repair item not fool proof at all IMO.
Most Mopar guys have blown at least one before we discovered the weak link
NO first gear burn outs and you are safe as can be.

Posted By: 70Dustmite440

Re: Two Piece Crank--440 go BOOM! - 02/04/15 05:06 PM

I'll see what I can do
Heyy Big Todd and David, this is Eric from down in Jax FL.

Attached picture 8418705-WP_20150124_013.jpg

Posted By: gdonovan

Re: Two Piece Crank--440 go BOOM! - 02/04/15 05:08 PM

Quote:

I still start my burnout in first, either i'm too old to change my ritual or my engines are too weak starting in second... or both

I do too but always shift up when the tires are going without exception.

Posted By: dvw

Re: Two Piece Crank--440 go BOOM! - 02/04/15 11:49 PM

I don't ever let the tires chirp. I'm out of the throttle as soon as it's rolling out of the water (3rd gear).
Doug

Posted By: mickm

Re: Two Piece Crank--440 go BOOM! - 02/04/15 11:52 PM

so i know very little about automatics, what is the problem with doing a burnout in first gear?

Posted By: gdonovan

Re: Two Piece Crank--440 go BOOM! - 02/04/15 11:54 PM

Quote:

so i know very little about automatics, what is the problem with doing a burnout in first gear?

The problem is the tires getting traction and the sudden stop in first will damage the overrunning clutch, explosion can follow.

In simple terms.

Posted By: mickm

Re: Two Piece Crank--440 go BOOM! - 02/04/15 11:59 PM

Quote:

Quote:

so i know very little about automatics, what is the problem with doing a burnout in first gear?

The problem is the tires getting traction and the sudden stop in first will damage the overrunning clutch, explosion can follow.

In simple terms.

ok, makes perfect sense, with what little i know!

so i guess that would be true for any automatic, modified or not?

Posted By: gdonovan

Re: Two Piece Crank--440 go BOOM! - 02/05/15 12:04 AM

Quote:

so i guess that would be true for any automatic, modified or not?

I just know Chrysler, can't speak for GM or Ford.

Even the race units with bolt in sprags or the later RWD OD units (which also have a bolt in sprag) it would be a bad idea to shock the drivetrain in first gear. Just a roller and spring arrangement that does not take kindly to the abuse.

Posted By: MR_P_BODY

Re: Two Piece Crank--440 go BOOM! - 02/05/15 12:12 AM

Quote:

Quote:

Quote:

so i know very little about automatics, what is the problem with doing a burnout in first gear?

The problem is the tires getting traction and the sudden stop in first will damage the overrunning clutch, explosion can follow.

In simple terms.

ok, makes perfect sense, with what little i know!

so i guess that would be true for any automatic, modified or not?

Not really... a STOCK VB has the LBA(low band apply)
a RMVB with out LBA the low band isnt applied if
just in drive... if you pull it down into low(1st)
then it applies the band... the thing with the over
running clutch is.. if the tires are spinning and
the ORC(over running clutch.. or known as the sprag)
it can load and unload... that forward SLAM on it
can break it... usually the next hard load on it just
blows the ORC then.. (this is the important part)
the forward drum will turn 2.2 times faster than the
engine rpm... pretty much anything over 6200 engine
rpm and the drum will centrifugally explode... hope
that gives you a idea of what happens
EDIT
If you start in 2nd with a MRVB(or just a manual VB)
you are not using the ORC so you dont have the issue
low gear is a issue on the 727.. thats why its advised
to get out of it ASAP.... never pedal a 727 in low..
shift first

Posted By: gdonovan

Re: Two Piece Crank--440 go BOOM! - 02/05/15 12:20 AM

Thanks Mr.P, been awhile since I heard the explanation, seen plenty of pics of the results though!

Posted By: MR_P_BODY

Re: Two Piece Crank--440 go BOOM! - 02/05/15 12:31 AM

Quote:

Thanks Mr.P, been awhile since I heard the explanation, seen plenty of pics of the results though!

Thats a lot of typing for me so I think I got it all
right.. the big thing is get out of low ASAP... second
and high arent a issue... and NEVER pedal in low..
that is when you slam the ORC... shift first

Posted By: mickm

Re: Two Piece Crank--440 go BOOM! - 02/05/15 01:03 AM

Quote:

Quote:

Thanks Mr.P, been awhile since I heard the explanation, seen plenty of pics of the results though!

Thats a lot of typing for me so I think I got it all
right.. the big thing is get out of low ASAP... second
and high arent a issue... and NEVER pedal in low..
that is when you slam the ORC... shift first

ok, did get most of that, but what do you mean "pedal in low"?

Posted By: MR_P_BODY

Re: Two Piece Crank--440 go BOOM! - 02/05/15 01:08 AM

Quote:

Quote:

Quote:

Thanks Mr.P, been awhile since I heard the explanation, seen plenty of pics of the results though!

Thats a lot of typing for me so I think I got it all
right.. the big thing is get out of low ASAP... second
and high arent a issue... and NEVER pedal in low..
that is when you slam the ORC... shift first

ok, did get most of that, but what do you mean "pedal in low"?

On and off the gas.. that is when the ORC will load
and unload.. the loading can break it... if it unloads
in low.. shift before you get back on it

Posted By: mickm

Re: Two Piece Crank--440 go BOOM! - 02/05/15 01:56 AM

Quote:

Quote:

Quote:

Quote:

Thanks Mr.P, been awhile since I heard the explanation, seen plenty of pics of the results though!

Thats a lot of typing for me so I think I got it all
right.. the big thing is get out of low ASAP... second
and high arent a issue... and NEVER pedal in low..
that is when you slam the ORC... shift first

ok, did get most of that, but what do you mean "pedal in low"?

On and off the gas.. that is when the ORC will load
and unload.. the loading can break it... if it unloads
in low.. shift before you get back on it

Posted By: Hemi ragtop

Re: Two Piece Crank--440 go BOOM! - 02/05/15 02:52 AM

I am running a Turbo Action "auto" valve body, extra line pressure etc. In drive, do I have to worry about the tires spinning and then hooking while the shifter is in Drive and the trans is still in low?
Side note, I am also using an A&A sprag etc.