MOPAR 727 Trans Explosion

[HEMI®Dart]

Just saw these pictures on another board. I believe that is a Kevlar Trans blanket with a hole. By looking at the Zoomies, blower & injection hat it looks like a strong car. Note the hole in the door.

 

[GFritsch]

Ouch!! I wonder if the driver was hurt by any flying debris.

 

[seemore]

Man, I hate when that Happens!!!, I hope nobody was hurt in that explosion.

I guess that's why all the safety rules in Drag Racing.

 

[Bob4x4]

Did it happen during the burnout?



Bob

 

[HEMI®Dart]

Did it happen during the burnout?



Bob

Bob,



I have a feeling it did. Someone said this happened to him too warming the tires in 1st gear. He said this is what happens when the "Sprag" lets go. TCI transmission says nothing can contain the shrapnel.



Original thread is here. I can't read Swedish. :-laf



http://forum.sssa.se/yabb2/YaBB.pl?num=1142798725/11#11



I can read Pro Mod & 7000, 9000 rpm?

 

[MDW]

Looks like the front clutch came apart.

 

[JOdell]

I, too hope no one was injured in that.

It looks like all the damage was to the right of the driver. At least that is what I see in that second picture.

Still had to be one heck of a ride. -Jason

 

[HEMI®Dart]

Some more info is coming about about this. Supposedly the 727 still had the OEM front drum? Someone can read a little Swedish.



A few guys agreed, In a nutshell: Too Much engine for the torqueflite.



"A pro mod type car with a torqueflite... ... . silly boy, shoulda been a lenco"



"... look at the size of that supercharger, so its an alcohol engine most likely a HEMI. with a torqueflite?



"..... what the hell is he doing with a torqueflite behind a blown alky motor? That's just stupid - in my opinion. "

 

[zstroken]

Some call it the sprag, but overrunning clutch fails, you see 2. 2 times engine speed if I remember correctly. Stock drum is good for about 9500 rpm, so it is good for about 4500 rpm. Blankets just help slow it down.

 

[HEMI®Dart]

Some call it the sprag, but overrunning clutch fails, you see 2. 2 times engine speed if I remember correctly. Stock drum is good for about 9500 rpm, so it is good for about 4500 rpm. Blankets just help slow it down.

I think you are right about 2. 2 times engine speed. I couldn't figure out where 15,400 rpm came into play from the swedish site. This sentence in swedish makes some sence now I think? :-laf



... så varvar du 7000 så snurrar den 15400 rpm.

Och original trumman klarar runt 9000 rpm.

 

[zstroken]

I think you are right about 2. 2 times engine speed. I couldn't figure out where 15,400 rpm came into play from the swedish site. This sentence in swedish makes some sence now I think? :-laf



... så varvar du 7000 så snurrar den 15400 rpm.

Och original trumman klarar runt 9000 rpm.

2. 2 is the reverse ratio.

 

[TowPro]

If you ever get to check out how an overrun clutch works, you would wonder how they can take the power they do take. When they lock the pressure is trying to force the outer race to get larger. I used to build a lot of THM-350's. If it was a build for anything more then stock it got a hardned outer race.

 

[JWick]

This has happened twice in a pulling truck, the front drum explodes, the guy's wife at the wheel both times, first time big block w/250 shot of gas and next time 800hp wedge, last time it had a blanket and it still destroyed the floor board and bruised her foot, You think the guys pulling with autos would take notes. Twice bitten third time shy.

 

[Hammer]

Bill. .

Its easy to see what happened with this car and all you ened to do is think back many moons ago. yes,this was a 727,but,it didn't use a torque convertor it had a clutch. In the old Flopper days and the early days of pro mod they used them and called them clutch flites. They leave like a stick transmission and drive like a automatic later. They have held more HP than most give them credit for and I'd be willing to be it was NOT a SFI clutch or SFI flywheel unit. Look at the blanket how its damaged a exploding torque convertor will do twice the damage. If you do not think so,ask John Baughman next time you see him about the one he blew apart many moons ago at the now closed 75-80 Drag-A-Way in Monrovia,MD in his 69 SS/FA Dodge Superbee. I can tell you this there was not much left of either the transmission,floorboard or his nerves afterwards. All that was left after that explosion of his 727 was the tailshaft,the rest was scattered from the 1/8 mile light down track... ... ... ..... Andy

 

[zstroken]

I disagree, there is no front drum, it exploded. Not saying what your your talking about can't happen, but look at the transmission and find the front drum.

 

[CLamb]

WOW these pictures have to be at least 5 or 6 years old seen them several times.