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Old 10-24-2011, 09:41 AM   #81
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Originally Posted by Matt Cramer View Post
Otherwise, a little bit of timing chain stretch or a worn timing belt tensioner, your cam signal suddenly goes from in front of a crank tooth to behind it, and suddenly your timing is off 10 degrees and you're hosed. And you can forget about using a set of equally spaced teeth for a continuously variable VVT algorithm.
Firstly, you'll note that the 4 cylinder Toyota setup uses one lump of metal for this task eliminating what you're talking about. In the case of the 1UZ-FE, where the two pulses come from two distributors and the 12/24 come from the crank, it could happen, but you're talking a lot of slop, enough that belts would be slapping casings, slipping teeth and generally breaking and causing major problems.

Secondly, unless the code absolutely SUCKS, the moment that it jumps from one tooth to the next it will lose sync, removing power from the engine, and causing fluctuations in velocity that will make it go back and forth over the threshold continuing to lose sync and forcing the engine to slow down and stabilise before being able to run again. In the extremely unlikely event that you got over that threshold and didn't cross it again back towards correct while losing sync and so on, then yes, you'd be screwed, but the chances of that happening are slim to none and slim just went inside for 20 to life for killing some other rapper ;-)
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