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An interference engine's valves will open to where their lowest point in travel is below the piston's highest point of travel. Should the valve be stuck open there and the piston continued moving it would came up to smack the valve. Bad things will happen. As long as the valves are in correct time and continue to move in synchronicity with the pistons they will never collide. When the timing belt breaks the valves stop moving while the piston continues to move as the crank spins. One or more valves are bound to be encroaching on the pistons' travel.
A non-interference engine's valves and pistons never move into the other's
range of travel. A broken timing belt causes no damage to the hard parts.
Someone else will need to chime in with where to find reference info on what engines are and are not interference types.
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His - 2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, R/T rear swaybar, no chrome, loads o'fun...
Ours - 2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
Hers - 1997 Green Avalon XL
Last edited by modian; 04-24-2008 at 01:40 AM.
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