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Message: <blockquote data-quote="chris2000" data-source="post: 1413282" data-attributes="member: 11855">my assupmtion only k, don't flame me.. hehe..Honda block and head are aluminium hence they get warped easily if overheat. So very common for honda block and head to skim. So if they skim too much, the valve to piston clearance is very tight.Furthermore, the pre-tensioner bearing on Honda has to be set and tighten properly and really tight to prevent them from slipping at high rev. The design of the pre-tensioner are very different from Proton so thats why they have to be tighten properly.So assumming the mech did not tighten properly or set it too loose, as you run the car over time or at higher rev, the pre-tensioner can't hold the timing belt load and slips a tooth or two. And when this happen, your valve to piston being closer and tighter(due to skimming), that one or two tooth misalignment is good enough for the vavle to hit the valve pockets of piston. When this happen it could have broke the valve and the valve fall onto the piston. Then on the next up stroke, the stem of the valve will get crush through your piston causing the hole in the center of the piston (quench area) and the flat side of piston hit the head!My assumption and imagination from my experience seeing many engine blow.Hope this info will help.. :)</blockquote>

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