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 Post subject: Re: had a Oil leak...
 Post Posted: Thu May 07, 2009 9:13 pm 
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Location: Elizabethtown, KY
Thanks Barry #-o =; The mount is not solid. I'm checking to see if a mid plate is legal in the class we are running. I have a couple of theories.

1 when we put the motor back in the tranny mount was still tight. We normally pull the 3 bolts holding the motor to the mount. I'm thinking it could have been in a bind.

2. not enough end play on the converter. This is the first time we have ran 1/4 mile. maybe pressure build up put stress on the housing. Jake said there is no vibration during the runs. But will get the driveshaft looked at.

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 Post subject: Re: had a Oil leak...
 Post Posted: Thu May 07, 2009 9:40 pm 
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Yup, I seen a few of them over the years and EVERY ONE was cracked on that side too.

Think about what forces are acting on the engine mass when it leaves the line and you'll understand why it broke where it did. Actually, the transmission is carrying part of the engine weight also with the stock mount setup. Add a 1.5 to 2 G launch to that and viola!

MIDPLATE!

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 Post subject: Re: had a Oil leak...
 Post Posted: Thu May 07, 2009 10:19 pm 
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Location: Shepherdsville, KY
Driveshaft balance will be more of an issue on the 1/4.

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 Post subject: Re: had a Oil leak...
 Post Posted: Thu May 07, 2009 11:04 pm 
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gearhead1011 wrote:
Driveshaft balance will be more of an issue on the 1/4.


I've seen this turn into an issue on car that was running front and rear motor plates. Full tube chassis also. He fought the problem for about 3 tranny cases until he decided to change the drive shaft. Been about 10 years now nad he still hasn't broken any more cases. He also hadn't noticed any vibrations.

Cheap fix/insurance by checking into it.

Don

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Last edited by want-a-be on Sat May 16, 2009 10:55 am, edited 1 time in total.

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 Post subject: Re: had a Oil leak...
 Post Posted: Sat May 16, 2009 9:58 am 
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Location: Elizabethtown, KY
Well go it back last night and a 1030 last night fired it up. it goes forward and rearward \:D/ \:D/ Rain out today [-( [-( [-( ](*,) ](*,) ](*,) Might go to BG in the morning and see how it does. If not then next week. =;

PS Brad (the trans guy) said the internals look as good as they did the day he put them in in 2004 \:D/ \:D/ \:D/

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 Post subject: Re: had a Oil leak...
 Post Posted: Sat May 16, 2009 10:57 am 
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What all have you changed to the car? Did you check the drive shaft?


Don

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 Post subject: Re: had a Oil leak...
 Post Posted: Sat May 16, 2009 2:51 pm 
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Location: Montgomery, Alabama
Been running a Front plate, mid plate, engine limiter, and solid trans mount for 12 years and never hurt a case.
4 years ago we switched to a JW Bellhousing, case, and tail shaft housing to get rid of the shields. This case is so beefy we got rid of the engine limiter. Never a problem.


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 Post subject: Re: had a Oil leak...
 Post Posted: Sat May 16, 2009 4:06 pm 
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Just the case and mad the mount hole bigger so the bolt went straight in. If it cracks again then the JW goes on.

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 Post subject: Re: had a Oil leak...
 Post Posted: Sun May 17, 2009 11:40 am 
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WR169 wrote:
Just the case and mad the mount hole bigger so the bolt went straight in. If it cracks again then the JW goes on.



I still think you need to check driveshaft balance. The problem started when you started running 1/4 mile right? !/4 mile = faster MPH, faster MPH = higher driveshaft RPM. A small balance problem at lower rpm is a bigger problem at a higher rpm.

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 Post subject: Re: had a Oil leak...
 Post Posted: Mon May 18, 2009 6:34 am 
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We plan on checking it before the next NMCA race. We raced at BG yesterday. The place was packed. Jake went out second round ran a Best 6.832 on a 6.83 \:D/ \:D/ \:D/ only bad part was .114 RT #-o We got home at a little after midnight. It was 10:10 pm EST at the end of 2nd round O:) it took 90 minutes to do first round T&T for super pro. Pro was just as bad. =;

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