Why couldn't Audi design pistons like these to avoid damage when TB breaks?
08-14-2008, 09:31 AM
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Why couldn't Audi design pistons like these to avoid damage when TB breaks?
Not sure which engine uses these pistons (I think its from a Toyota), but they've got valve relief pockets that avoid catastrophic valve/piston damage when the timing belt/tensioner/waterpump goes bad. I'm guessing they're not used much because they still lower the compression, making our little 1.8t's even less powerful!?
<img src="http://pictureposter.audiworld.com/95500/piston2.jpg">
fkacct
<img src="http://pictureposter.audiworld.com/95500/piston2.jpg">
fkacct
08-14-2008, 09:37 AM
#2
Many manufacturers make Non-interference engines....>
Audi doesn't.
Break a belt on something like a Miata and it's merely an inconvenience..<ul><li><a href="http://www.gates.com/brochure.cfm?brochure=2256&location_id=3487">I nteresting link to Gates as well as more info on change intervals</a></li></ul>
Break a belt on something like a Miata and it's merely an inconvenience..<ul><li><a href="http://www.gates.com/brochure.cfm?brochure=2256&location_id=3487">I nteresting link to Gates as well as more info on change intervals</a></li></ul>
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08-14-2008, 10:20 AM
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Valve reliefs are designed to avoid valve-piston contact under normal operation...
Not necessarily to prevent catastrophic failure in the event that a tensioner collapses. Consider that an engine using a hot (high lift) cam with high compression needs clearance somewhere (it gets tight in there).
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