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Dizzy Belt

S

sue11sam

New member
Morning chaps, what is the consensus on changing dizzy belt?do we change it because it is probably old, but running fine, or change it in case it breaks?
 
I'm sure this was discussed on here (quite a long time ago) and the view from those-in-the-know (not me!) was that the perceived need to change them came from 964s and that the 993 design was less prone to problems so not worth changing. But someone will probably correct my memory.
 
yep, I agree with the 964 point although I guess with the mod for 993 dizzy we should not have so much to worry about, except if there is a failure we all know the potential consequences can be catastrophic! With the extended mileages that some of our cars are now reaching, plus the undoubted decay of the belt over all the years installed, its kinda nagging at the back of my mind a bit! The other thing of course is pulling the dizzy's to change the belt would also be a good time to refurb dizzy drives, bushes etc?
 
So is the turbo missing 6 plugs?

What are the "catastrophic consequences"? I'd always assumed the car just lost half its sparks?
 
Turbo's run single distributor feeding one plug per cylinder. Possible consequences include the rotor arm in the dizzy cap, which is not now rotating, firing a plug out of sequence within the cycle of the engine, and possibly causing massive damage to the engine. It is also possible when the belt breaks, and the rotor arm stops between the contacts within the cap, the engine vibration could cause the rotor to move within range of the spark meeting the contact in the cap. Simplified diagram below.


http://auto.howstuffworks.com/ignition-system4.htm
 
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