I just got started in autocross and I'll also be logging some track time soon. A neighbor who used to drive a MG asked if I planned to install a shatter shield in my car. I've googled this subject and don't see any mentioned of a shatter shield in a Miata. Is this something that only concerns older cars?
shatter shield question
May 23, 2007
10 Replies
Nope. ANY car with a high revving engine.
At high RPMs, the clutch disk and even the pressure plate can come apart and sling shrapnel all over the place. Many a driver has had his legs seriously injured or even amputated by an exploding clutch.
It happens, but much less with automatic transmissions.
A scatter shield is typically a wide steel plate or band that encircles the bell housing and the flywheel, clutch, and pressure plate. If the clutch comes apart, the scatter shield should contain most of the high velocity fragments.
In my opinion, it is more important than a roll bar. I wouldn't race without one.
Tim
Have there been cases with Miatas?
Leon
No, it only concerns engines operated at redlines significantly higher than stock. I've never heard of any Miata blowing its clutch, at any rpm.
Apparently, it is something aftermarket clutches might do:
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Leon
In drag racing, scatter shields are routinely used on automatics, the pressure in a torque converter can cause it to explode.
That looks like a "CYA" disclaimer. The very remote possibility is there, but I think that we would of heard of at least one miata driver being injured by this over the last 17 years, and at least me and Lanny haven't, even when they are running extremely high horsepower.
The fact that Flying Miata does not offer a scatter shield, even with their highest turbo boost application, is also highly telling, as they know what they are doing.
The weak link seems to be the transmission and the rear end. The current miata of the month ripped the rear end out and snapped both the power plant frame and the entire differential case before the clutch and pressure plate became an issue.
Pat - yes, still in Texas, I lost the bet.....
Errr, make that a shatter shield.
Does anybody make one for the miata? I have never seen one offered and I am guessing that the people that take the miata to insane horsepower levels for drag racing make a custom one.
Pat
I guess I'll run without one until I at least hear about someone else installing one on a Miata. Thanks for all the replies.
That was my thought. If I hear about someone getting sliced up by their pressure plate blowing apart up, I will either quickly install a shatter shield or go back to a stock clutch and power level. If mine blows up and I happen to live, with or without legs, I'll be sure to let ya know. :-)
Pat
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