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Old 10-05-2012, 11:07 PM   #21
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What did you weld inside the belhousing?
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Old 10-06-2012, 12:30 AM   #22
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Have you looked into 949racing's twin clutch setup? A bit more weight but may hold up better. And their pulley or an ATI super damper would help with harmonics as well.
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Old 10-06-2012, 12:55 AM   #23
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Fae, I am running a Quaife Sierra dog box, if you look you can see two plates that make up the adapter, one plate is mounted to the transmission case, and one is welded to a shortened bell housing, that plate serves as a mounting surface for the throwout bearing and is also bolted to the plate mounted on the transmission case.


The plan at this time is to repair the crack in the bell housing. I will separate the two mounting plates and bolt the bell housing to a bare block to ensure that all bolt holes and alignment dowels are in proper alignment while welding.
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Old 10-06-2012, 01:42 AM   #24
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Quote:
Originally Posted by miata_racer View Post
Have you looked into 949racing's twin clutch setup? A bit more weight but may hold up better. And their pulley or an ATI super damper would help with harmonics as well.
Building a new engine for next season, my current engine is the one that came with the car. It is a small nose crank engine, I have not been able to find an aftermarket harmonic dampener for it. The new engine is a big nose engine, I will be using a aftermarket damper that has a trigger wheel for my electromotive incorporated into it. I hate to move away from my current clutch setup as I have two complete setups, one new in the box. However, a heavier flywheel will help with harmonics and will prevent the issues I had at the end of the race. It will also make it a bit easier to get the car moving, I have a tall 1st gear, runs out to approx 58mph at 8k. With the current flexplate/flywheel, 4 1/2 inch clutch, and cams that are worthless below 4500 rpm, getting the car to move off grid or in the paddock is a real adventure. It was really tough to get it going at RA because the grid is located on a hill.
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Old 10-06-2012, 02:34 AM   #25
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Holy hell!

How on earth did you manage to even finish the race with that thing flopping around inside the bellhousing? It must have sounded like a washing machine full of hammers.
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Old 10-06-2012, 03:13 AM   #26
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Honestly, After it broke I think it sat against the bottom of the bell and just moved back and forth ever so slightly, the big chunk was laying at the bottom. I think I got real lucky with how it broke and came to rest. There was some vibration the last few laps in 5th gear, but hey its the runoffs, and I was running in 6th so I kept my foot in it.
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Old 10-06-2012, 06:08 AM   #27
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Here is a video of the first couple of laps. Remember I only had 7 laps at speed on the track before the start of the race. I left the pace lap so people that have not been to the track can see a lap at a slow pace.
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