|
Re: Tranny Explodes
[Re: terzmo]
#1024662
07/02/11 06:14 PM
07/02/11 06:14 PM
|
Joined: May 2003
Posts: 13,200
aZLiViN
J_BODY
I Live Here
|
I Live Here
Joined: May 2003
Posts: 13,200
aZLiViN
|
Quote:
..took off and spun the tires...driver let off and the tranny blew like there was 5 pounds of C4 in it...
Tires may have hooked and unhooked.... hard on the roller clutch. see what condition it's in when you disassemble. Stock front drum I'm assuming? Time for an aluminum or aftermarket steel drum. and as mentioned, a shield or blanket is a must. Same thing happened to a friend of mine with a low 11 Challenger. In his case the rear gear broke, shocking the rear roller allowing it to lock which spins the front drum to the point of..... well, you've been there now.
....and pop the rear cover and check the ring gear just to be safe.
|
|
|
Re: Tranny Explodes
[Re: topside]
#1024663
07/02/11 06:14 PM
07/02/11 06:14 PM
|
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
|
master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
|
Do a search on here you would have quickly found the cause.
Funny how a GM guy will listen to the warnings involved with their race parts. But, a hardheaded Mopar guy will ignore and keep going then wonder what happened when something goes wrong.
You overrun the clutch (AKA Sprag) and the front drum revs into the twilight zone. Boom it explodes. It's not the 727 as a stock one in low gear will not blow up.
It is the aftermarket parts that allow the rear drum to spin free expecting the sprag to hold it as they do not apply the rear band in low. Bolt-in sprag, still same problem.
A rear band apply valve body is the way to go. Many manual valve bodies are not. When building that 727 instead of wasting money on parts you do not need spend $500 on a billet front drum that will not explode. I know someone that blowed one but still will not buy the drum. And a no low band apply valve body.
Senseless. But, it is the 727's fault people build these trannies every day like this.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
|
|
|
Re: Tranny Explodes
[Re: Leon441]
#1024664
07/02/11 06:44 PM
07/02/11 06:44 PM
|
Joined: Oct 2008
Posts: 492
South Jersey, NJ
DragDart360
mopar
|
mopar
Joined: Oct 2008
Posts: 492
South Jersey, NJ
|
NHRA rules require a transmission shield any quicker than 11.00
I just put a CSR shield in my Dart as I expect to run low 10's.
It's the best $300 you can spend. 904 behind a small block, bolted right up.
70 Dart Swinger, 2850 lbs
SB 408, Bullet roller 264/268 @50 .636 SSDS stage 2 Edelbrock heads, 1 7/8 Headmans, 1050 dominator by Dom, 9.867 @ 133
|
|
|
Re: Tranny Explodes
[Re: terzmo]
#1024669
07/02/11 08:38 PM
07/02/11 08:38 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
Just built a drag car... has a new 512 stroker motor....indy heads...727..low gear kit,manual valve body..dana..4 link suspension...33 by 17 tires.Ran a best of 10.28 so far...Car did a burnout fine...came to line..took off and spun the tires...driver let off and the tranny blew like there was 5 pounds of C4 in it...tail shaft and converter survived but the case is in a hundred parts....as everything in the case....went through the floor..broke the drivers foot in 3 places....
What would/could cause this ?
As soon as he let off in first gear at high RPMs is
when it killed the sprag/over running clutch and
then it spins the drum 2.2 times faster than the
engine RPMs... centrifugal force did the rest...
all you have to know on those trannies is not to
let off in first gear at high RPMs... SHIFT to second
then let off(over running clutch isnt in play then)
|
|
|
Re: Tranny Explodes
[Re: cudadoug]
#1024671
07/02/11 09:15 PM
07/02/11 09:15 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
Just what Mr. P body says. 
GET A BLANKET OR A SHIELD!!!!!
Wait a second. How does a 4-link car with a funny car tire SPIN...??
Simple... pump them up like a basket ball
|
|
|
Re: Tranny Explodes
[Re: dOoC]
#1024672
07/02/11 09:23 PM
07/02/11 09:23 PM
|
Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
|
Quote:
An alum drum or LBA valve body would have prevented this ... 
Can You explain LBA valve body....thanks in advance
|
|
|
Re: Tranny Explodes
[Re: hemigod426]
#1024674
07/02/11 10:48 PM
07/02/11 10:48 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
did he not have a bolt in sprag? first gear burn out? slipped out of gear?
Bolt in sprags will break also... they are for a loose
race in the housing... unless its a super sprag with
lots of rollers
|
|
|
Re: Tranny Explodes
[Re: hemigod426]
#1024675
07/02/11 10:49 PM
07/02/11 10:49 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
|
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
Quote:
did he not have a bolt in sprag? first gear burn out? slipped out of gear?
bolt in sprag will not remotely help in preventing an explosion, it is simply a fix for a damaged case, they do have some out that have improved holding ability but still they are not the end all be all of preventing a explosion,,LBA valve body and proper use during burnouts (second gear start) and driving charicteristics is the way to make them live. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Tranny Explodes
[Re: dartman366]
#1024676
07/02/11 10:53 PM
07/02/11 10:53 PM
|
Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
|
I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
|
Quote:
Quote:
did he not have a bolt in sprag? first gear burn out? slipped out of gear?
bolt in sprag will not remotely help in preventing an explosion, it is simply a fix for a damaged case, they do have some out that have improved holding ability but still they are not the end all be all of preventing a explosion,,LBA valve body and proper use during burnouts (second gear start) and driving charicteristics is the way to make them live.
That combined with an aluminum / billet steel drum to prevent the hand grenade from going off.
To answer the OP - The drum exploded, you had the stock cast iron drum in there and you need to call John Cope and get a billet or aluminum drum in your next tranny.
The super sprag or at least a bolt in unit will prevent things from going bad as well, but the drum is what exploded.
|
|
|
Re: Tranny Explodes
[Re: DJVCuda]
#1024677
07/02/11 11:03 PM
07/02/11 11:03 PM
|
Joined: May 2004
Posts: 12,396
Taxes & Virus's R-US, NY
Dragula
I Live Here
|
I Live Here
Joined: May 2004
Posts: 12,396
Taxes & Virus's R-US, NY
|
Quote:
Quote:
Quote:
did he not have a bolt in sprag? first gear burn out? slipped out of gear?
bolt in sprag will not remotely help in preventing an explosion, it is simply a fix for a damaged case, they do have some out that have improved holding ability but still they are not the end all be all of preventing a explosion,,LBA valve body and proper use during burnouts (second gear start) and driving charicteristics is the way to make them live.
That combined with an aluminum / billet steel drum to prevent the hand grenade from going off.
To answer the OP - The drum exploded, you had the stock cast iron drum in there and you need to call John Cope and get a billet or aluminum drum in your next tranny.
The super sprag or at least a bolt in unit will prevent things from going bad as well, but the drum is what exploded.
We found parts of the sprag and the drum in the car. Litterally, one of the sprag bearings went thru the floor like a bullet, left a hole just like one. Other parts were larger and it could have been really bad. I talked with Paul today, and even though he doesn't feel lucky, I told him some of the stuff we found in the car.
The trans is toast, but all the parts to put a new one are in. It will have a sheild & a super sprag. The floor boards on the other hand are a real mess. Its going to take some sheet metal work to fix.
It spun off the line due to a bad burn out procedure which seems to be because the line lock button was moved and its not comfortable were it ended up. It is being moved before I climb in...
|
|
|
Re: Tranny Explodes
[Re: MR_P_BODY]
#1024679
07/02/11 11:22 PM
07/02/11 11:22 PM
|
Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
|
I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
|
Quote:
To answer the OP - The drum exploded, you had the stock cast iron drum in there and you need to call John Cope and get a billet or aluminum drum in your next tranny.
The super sprag or at least a bolt in unit will prevent things from going bad as well, but the drum is what exploded.
I still run a stock drum... its what you do and dont do
that keeps it from blowing... and a bolt in sprag
wont save anything... if you want a good sprag you
better be looking at a super sprag or the like
Dont get me wrong - some people - make that alot of people do it - does it make it right? if doing something unsafe and getting away with it makes it right? nope!
The bottom line is there is a bomb in every single stock drum 727 out there. the part that explodes is the drum, you can dance with the devil your whole life and win, or tomorrow might be your time -
WHY RISK IT?
It could go through your body and kill you... is that really worth it?
just to say you can do it?
|
|
|
Re: Tranny Explodes
[Re: DJVCuda]
#1024680
07/02/11 11:29 PM
07/02/11 11:29 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Dont get me wrong - some people - make that alot of people do it - does it make it right? if doing something unsafe and getting away with it makes it right? nope! The bottom line is there is a bomb in every single stock drum 727 out there. the part that explodes is the drum, you can dance with the devil your whole life and win, or tomorrow might be your time - WHY RISK IT? It could go through your body and kill you... is that really worth it? just to say you can do it?
Dont do STUPID SH***T... and 1 is letting off the
pedal in low gear at high RPM... I believe its 13.5K
for that stock drum to over rev and blow
EDIT
and when you let off at high evs it blows the sprag
and then it turns 2.2 times the engine
Last edited by MR_P_BODY; 07/02/11 11:31 PM.
|
|
|
Re: Tranny Explodes
[Re: MR_P_BODY]
#1024681
07/02/11 11:44 PM
07/02/11 11:44 PM
|
Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
Steve1118
master
|
master
Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
|
"Dont do STUPID SH***T... and 1 is letting off the
pedal in low gear at high RPM... I believe its 13.5K
for that stock drum to over rev and blow
EDIT
and when you let off at high evs it blows the sprag
and then it turns 2.2 times the engine"
That pretty much sums it up.
If a drum blows, it is because on either that run, or shortly before, someone did something dumb or made a mistake and never checked it. The sprag doesn't turn by itself. DJV, To insunuate that us old timers who have been using pretty much stock Torqueflites since Moby Dick was a minnow are either too stupid to know better or are spitting in the eye of the reaper is insulting. We just take issue with your statement. I'm pretty sure that I speak for all of us when I tell you that if we were convinced that it was an overly unnecessary risk, no one would take it. But, to my mind, it is low on the list of things that could happen, if one is careful and pays attention to what they are doing. Do I use a blanket? Of course, that is the smart thing to do. My belts are also up to date, and my suit and helmet meet specs. My brakes also work.
I've been doing this since 1964, and have only seen one explode, and it was preventable. This, of course, is not including the neutral start craze of 67-68, which is another story altogether. That was before the advent of high stall converters, and Chrysler itself was involved with that. Dave Wren "invented" it at the Chrysler proving ground, and everyone was doing it. The famous pic, earlier in this post, was of Dick Oldfield's Iron Butterfly 64 Hemi at Indy while the neutral start deal was in vogue. Ron Mancini had a big one at Bristol earlier that year, and NHRA stopped it after Dick's deal. Whoever posted that pic should have been more specific....that is famous pic that has appeared about everywhere. One needs to tell the whole story, providing they know it. Otherwise, hysterical threads like this have every eighteen year old kid who races a 318 Duster out buying $700 drums that they really can't afford because "every 727 has a bomb in it". Gimme a break.....big time overstatement.
Last edited by Steve1118; 07/03/11 12:09 AM.
|
|
|
Re: Tranny Explodes
[Re: Steve1118]
#1024682
07/03/11 12:59 AM
07/03/11 12:59 AM
|
Joined: Oct 2006
Posts: 4,765
quick77rt
Parts Problem
|
Parts Problem
Joined: Oct 2006
Posts: 4,765
|
I've been doing this since 1964, and have only seen one explode, and it was preventable.
Ok 1964 was a long time ago, so vs any of the older crowd getting bent lets just flip it around and blame these two recent exp. 727s on the ignorance of the youth of today.
With that the fact remains just this week there has been two blow and one guy hurt, I myself have never had an oem 727 come apart, however even in my street beater spray car I run a crt pro race as well with the blanket because I do value my feet and my passenger.
So really at the end of the day does it matter how old one is in this whole big picture, 727-s blowup.
What im really surprised about is the moral police on moparts should be all over this one but I guess as long as its not there foot busted up its ok.
Do I really care if one gets there foot blown off, young or old, not really its just silly to see it happen, when things can be done to prevent it or reduce the chance of driver harm.
Ive noticed that many who have not replied to this are the people running the right drums and shields or blankets as required by tech, and now dam, what am I to do with a guy like John Cope selling me a perfect working trans that I have zero worries with except say THANKS!
|
|
|
Re: Tranny Explodes
[Re: FastmOp]
#1024688
07/03/11 01:28 AM
07/03/11 01:28 AM
|
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
dOoC
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
|
You can put a CAST IRON shield around it... with two blankets. THAT might prevent the floor from being damaged ... but how about the converter, the case, valve body and everything else ? ... Could be JUNK if all that happened. A billet steel drum is good ... but a steel-jacketed alum drum is the ticket. The 727 can NEVER "blow-up".
|
|
|
Re: Tranny Explodes
[Re: J_BODY]
#1024689
07/03/11 01:38 AM
07/03/11 01:38 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
So if I'm running the 17156 manual valvebody (no low band apply) that Turbo Action sells, I shouldn't let off the gas in first gear crusing down the street?  I'm aware of the no first gear burnout deal.
|
|
|
Re: Tranny Explodes
#1024690
07/03/11 01:41 AM
07/03/11 01:41 AM
|
Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
|
I think that`s the one I have and I never get on and off the gas in first ANYWHERE. Sometimes on the street I even take off in second and cruise parking lots in second also.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
|
|
|
Re: Tranny Explodes
[Re: 440Jim]
#1024691
07/03/11 01:57 AM
07/03/11 01:57 AM
|
Joined: Jan 2003
Posts: 296
Ontario Canada
Hutch
enthusiast
|
enthusiast
Joined: Jan 2003
Posts: 296
Ontario Canada
|
Quote:
But the cause is letting off the throttle in 1st gear with no low band (rear band) apply in 1st gear.
So your saying the direct(front) drum is being spun to burst speed when you lift throttle in first gear and the roller clutch freewheels?
I really think you are misinforming people with this statement.
Hutch
|
|
|
Re: Tranny Explodes
[Re: J_BODY]
#1024696
07/03/11 12:36 PM
07/03/11 12:36 PM
|
Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
|
top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
|
Quote:
This one had the engine set back about 10 inches. Rear gear broke on the launch, folded the springs in the roller with the shock, and the rest made a mess.....and he walked away!!! Pieces of trans stuck in his door panel, dent in the roof, and a chunk of drum wiped out the gauges if I recall. This was long before Al Gore invented the interwebs so we hadn't ever seen/heard anything like it. But we learned!
What was the gauge/thickness of that modified trans tunnel?
Whoever drove that car was VERY lucky that day!! 
A lot of racers complain about safety rules...They are trying to make our sport safer.
If your foot or hand gets broken/mangled and you can't work, now what?
I ran with a stock drum for a long time.
When it was being freshened we would look for cracks, and replace.
I ALWAYS start my burnout in 2nd gear.
I also had a trans shield and flexplate shield per NHRA rules. Just to be safe.
Never tested the shields, thank GOD.
Don
|
|
|
Re: Tranny Explodes
[Re: maximum entropy]
#1024699
07/03/11 09:21 PM
07/03/11 09:21 PM
|
Joined: Mar 2003
Posts: 2,513
PA
moparacer
master
|
master
Joined: Mar 2003
Posts: 2,513
PA
|
If you are making ANY amount of serious power JUST PUT A GLIDE IN IT.... Nuff said.... I might be a mopar guy at heart but I do happen to value walking around with both feet properly attached thank you.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
|
|
|
Re: Tranny Explodes
[Re: moparacer]
#1024700
07/03/11 10:18 PM
07/03/11 10:18 PM
|
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
dOoC
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
|
Quote:
I might be a mopar guy
at heart but I do happen to value walking around with both feet properly attached thank you.
But NO ... you are not ..... you are deep-down a GovernmentMotors  .....  ... 
Yes ...feet are important part of the body ...and YES ... 727's BLOW UP .....
But if you have the proper parts IN THE TRANS .. they are as "safe" as any 727 in a daily-driver.
|
|
|
Re: Tranny Explodes
[Re: 1_WILD_RT]
#1024701
07/03/11 10:43 PM
07/03/11 10:43 PM
|
Joined: Jan 2003
Posts: 296
Ontario Canada
Hutch
enthusiast
|
enthusiast
Joined: Jan 2003
Posts: 296
Ontario Canada
|
Quote:
Quote:
Quote:
But the cause is letting off the throttle in 1st gear with no low band (rear band) apply in 1st gear.
So your saying the direct(front) drum is being spun to burst speed when you lift throttle in first gear and the roller clutch freewheels?
I really think you are misinforming people with this statement.
Hutch
No! That is not what he is saying... The explosion occurs when you launch after having let off the throttle at high RPM with the shifter in first gear with no low band apply.... This can allow the sprag to lay over... Once the sprag lays over the pin has been pulled.. If you miss the signs an explosion is eminent... A bolt in sprag does nothing to stop the problem because all a bolt in sprag does is secure the outer portion of the sprag to the trans case with bolts rather than splines & a set screw... A low band apply valve body prevents the issue by holding the low/reverse drum so the sprag doesn't see the load that could cause it to fail... An aluminum or billet drum doesn't prevent the sprag failure but the drum is of higher quality & if the sprag does fail the drum doesn't fail so theres no explosion.. What is being pointed out is if your aware of the problem, know the cause & drive with the proper procedure than there is no problem... Either start the burnout in second or shift to second before getting out of the gas..... Also be out of first before the tires hit dry pavement.. The shock of the tires grabbing coming out of the burnout box can shock the sprag causing it to lay over.... Be aware...... Or don't pay attention & just buy a low band apply valve body so your protected....
I am very aware of WHY they blow up that is why I made a comment about the statement I quoted prior to yours which states the "cause" which is inaccurate and misinformative IMO. Im not looking to get into it , just to offer proper accurate info. Lifting off the throttle w/o low band apply does nothing to the roller clutch. Improper burnout procedure , jackstand transbrake tests , improper assembly of roller clutch (roller diameter or spring direction/condition) inner race preparation and the list goes on is the cause of the problem. Low band apply helps stabilize the clutch but is not the cure.
Hutch
|
|
|
Re: Tranny Explodes
[Re: Hutch]
#1024705
07/04/11 08:54 AM
07/04/11 08:54 AM
|
Joined: Jan 2003
Posts: 16,928
NC
440Jim
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,928
NC
|
Quote:
Quote:
But the cause is letting off the throttle in 1st gear with no low band (rear band) apply in 1st gear.
So your saying the direct(front) drum is being spun to burst speed when you lift throttle in first gear and the roller clutch freewheels?
I really think you are misinforming people with this statement.
Hutch
I am not trying to misinform people, you don't understand. You are the one that posted the burst speed statement, not me. I was commenting on driving technique.
It is the unloading and reloading the sprag that can damage it. It all started (in this case) with lifting in 1st gear with no low band apply. That in itself may not roll the sprag, but if the driver shifts to 2nd before lifting, the reloading of the sprag will never happen and therefore avoid damage.
Only after the sprag is rolled, and the trans is in 1st gear with no low band apply and power is applied; then the front drum spins at 2.2 engine speed. This could happen on the next launch, when the damage was done in the previous launch.
The point I was trying to make, without the long and confusing explaination, is to shift to 2nd when something goes wrong. If you need to lift the throttle for other safety reasons, still shift to 2nd!
|
|
|
Re: Tranny Explodes
[Re: rapom]
#1024706
07/04/11 11:58 AM
07/04/11 11:58 AM
|
Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
|
Quote:
Doing a burn out in 1st. gear. I'll let others explain.
This was on launch..not burnout
|
|
|
Re: Tranny Explodes
[Re: MR_P_BODY]
#1024707
07/04/11 11:59 AM
07/04/11 11:59 AM
|
Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
|
Quote:
Quote:
Just what Mr. P body says.
GET A BLANKET OR A SHIELD!!!!!
Wait a second. How does a 4-link car with a funny car tire SPIN...??
Simple... pump them up like a basket ball
tire pressure was no over inflated
|
|
|
Re: Tranny Explodes
[Re: terzmo]
#1024708
07/04/11 12:44 PM
07/04/11 12:44 PM
|
Joined: Nov 2003
Posts: 7,348
Mt.Vernon ,Ohio
VernMotor
master
|
master
Joined: Nov 2003
Posts: 7,348
Mt.Vernon ,Ohio
|
Quote:
Quote:
Doing a burn out in 1st. gear. I'll let others explain.
This was on launch..not burnout
But did he do the burn out in 1st gear ?
|
|
|
Re: Tranny Explodes
[Re: terzmo]
#1024709
07/04/11 01:34 PM
07/04/11 01:34 PM
|
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
dOoC
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,451
Florida STAYcation
|
Quote:
Quote:
Doing a burn out in 1st. gear. I'll let others explain.
This was on launch..not burnout
From what I have heard(never seen this happen) ... is that you can damage the sprag on a burnout(when coming out of the water by hooking then spinning then hooking again).....THEN on the launch the sprag comes apart and the insides spin 2.5 times engine speed.
WITH an alum drum(or billet steel) ... no V8 Mopsar engine is capable of reving HIGH ENOUGH to explode the front-drum.
|
|
|
Re: Tranny Explodes
[Re: VernMotor]
#1024710
07/04/11 03:18 PM
07/04/11 03:18 PM
|
Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
|
OP
top fuel
Joined: Mar 2005
Posts: 2,060
Pendleton NY
|
Quote:
Quote:
Quote:
Doing a burn out in 1st. gear. I'll let others explain.
This was on launch..not burnout
But did he do the burn out in 1st gear ?
no..2nd
|
|
|
Re: Tranny Explodes
[Re: 440Jim]
#1024712
07/04/11 08:38 PM
07/04/11 08:38 PM
|
Joined: Jan 2003
Posts: 296
Ontario Canada
Hutch
enthusiast
|
enthusiast
Joined: Jan 2003
Posts: 296
Ontario Canada
|
Hutch
I am not trying to misinform people, you don't understand. You are the one that posted the burst speed statement, not me. I was commenting on driving technique.
It is the unloading and reloading the sprag that can damage it. It all started (in this case) with lifting in 1st gear with no low band apply. That in itself may not roll the sprag, but if the driver shifts to 2nd before lifting, the reloading of the sprag will never happen and therefore avoid damage.
Only after the sprag is rolled, and the trans is in 1st gear with no low band apply and power is applied; then the front drum spins at 2.2 engine speed. This could happen on the next launch, when the damage was done in the previous launch.
The point I was trying to make, without the long and confusing explaination, is to shift to 2nd when something goes wrong. If you need to lift the throttle for other safety reasons, still shift to 2nd!
Once again , your confusing people. You stated ,when you get into trouble on the track we should now shift to 2nd and that will prevent future roller clutch failures? HELL NO!!
If we lift throttle in low gear and do not shift to 2nd we will kill the roller clutch? HELL NO!!!
Pedalling the car in low gear can damage a roller clutch. HELL YES!!
Just wanting to clarify this with you.
Hutch
|
|
|
|
|
![6710729-102_2607[640x480].JPG](/ubbthreads/ubbthreads.php/ubb/download/Number/106919/filename/6710729-102_2607[640x480].JPG){kind=link}
