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Broken eccentric shaft (?)

Old 04-24-06, 09:54 PM
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Broken eccentric shaft (?)

I have been messing with and racing rotaries for a while now, and never heard of this before. Last weekend I missed an upshift (on the track) and had to dip the clutch while searching for third and popped it out pretty hard when it finally went into gear. I immediately felt a vibration that quickly turned into an undercar oil fire and the car pretty much grinding to a halt.

I pulled the engine tonight and pulled off the transmission figuring I had had lost a main seal. Went to rotate the flywheel and it came off in my hand, the eccentric shaft was severed about midway into the rear bearing. I am assuming it is a total fluke, bad casting or whatever, but just thought it was interesting enough to share and maybe solicit whether anyone has heard of such a thing. Car is a stock drivetrain RX-8.

Steven
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Old 04-24-06, 10:25 PM
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WHAT!!?! NO WAI!!! never could've imagined that would happen.
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Old 04-24-06, 10:32 PM
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we needs pics of a broken eshaft.
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Old 04-24-06, 11:28 PM
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I will definitely get pics tomorrow. It's way cool (in a very expensive sort of way).
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Old 04-24-06, 11:29 PM
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This might be a first ever!

Hurry up with the pics.

Anthony
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Old 04-25-06, 12:28 AM
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Uhh Ohh! Now one must question the integrity of the Renesis e-shaft. I heard it was slightly lighter. Maybe it's casting now has some weak points with it's weight savings?
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Old 04-25-06, 02:22 AM
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You've got the Silver -8, correct?
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Old 04-25-06, 02:40 AM
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the last thing the rx8 needs is a shoddy e shaft.
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Old 04-25-06, 06:52 AM
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http://fc3spro.com/TECH/HOF/hof.html

The second entry is a pic of a sheared e-shaft.


-Ted
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Old 04-25-06, 11:50 AM
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So, what sort of "racing" were you doing? Road course? Drag?
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Old 04-25-06, 02:24 PM
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Pics & stuff

Steven was road racing with SCCA in MAM. Yes, he is the silver RX-8.

http://www.tuxedoparkracing.com/rx-8...ft/RX8EccShaft

Sheila (Steven's wife)
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Old 04-26-06, 12:42 AM
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Originally Posted by saburkett
Steven was road racing with SCCA in MAM. Yes, he is the silver RX-8.

http://www.tuxedoparkracing.com/rx-8...ft/RX8EccShaft

Sheila (Steven's wife)

That explains it, Silvers are cursed (seriously).
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Old 04-26-06, 05:05 AM
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Wow and on a NA! I could see this from some big boosted monster, but damn. What are your plans with the motor?
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Old 04-26-06, 09:12 AM
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I'm hoping that it is rebuildable. It'll be a couple of weeks until I have time to tear it down and see, but it still turns free, makes audible compression and doesn't have any unusual slop or freeplay, so hopefully the housings and rotors are okay. Only has 6000 miles on it, but half of those are race miles.

Steven
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Old 04-26-06, 02:49 PM
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Wow, that is gnarly!

Have you called Motorsports yet? I wonder if they or Mazda USA would be willing to help you out on this...
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Old 04-26-06, 02:54 PM
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Steve, that thing must be under warranty still right? Your car is basically stock besides that jungle gym you have in there so I wouldn't expect them to give you a hard time.

Well, now you can finally do the secret porting that we were talking about
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Old 09-17-08, 06:22 PM
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what tires are you running in the rear? size and compound?
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Old 09-17-08, 08:49 PM
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What was your belt tension set at?

the only time I have ever seen an E-Shaft shear was due to belts being way too tight.
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Old 09-17-08, 11:28 PM
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Originally Posted by sk8erpunk1983 View Post
What was your belt tension set at?

the only time I have ever seen an E-Shaft shear was due to belts being way too tight.
That's how Ralph Friend broke the eshaft in his FD.
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Old 09-18-08, 07:44 PM
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Unhappy

Dam. Never seen or heard of it that. that sucks
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Old 09-19-08, 04:51 AM
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Lol
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