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Message: <blockquote data-quote="deacon" data-source="post: 2128516" data-attributes="member: 12923">Compression is already high in a 4G93P engine. It normally runs around 10:5:1 compression ratio.When you add Mivec pistons to the engine your compression goes up to 12:1:1 or something really close to that. In M'sia there is no high enough octane gas to power such compression. Even if you use normal 1.6 pistons its still tricky and dangerous.The reason being that the aforementioned pistons stick out of the block whereas the normal 4G93P pistons do not. When your high compression pistons push up there is more compression build up. In a long stroke engine that's very bad.Think of it this way (Hopefully this will make some sense) a B16A has the same bore and stroke size as the 4G92 Mivec engine. Our 4G93P engines has the same bore size but a longer stroke than the Mivec and B16A. Which means to get the extra 200cc of displacement a lot of stroke has been added. The longer the stroke the harder the engine needs to pump upwards to create the desired power. This creates more problems because the higher the revs the more stress the engine experiences.For example comparing a B18C1 or B18C5 to a 4G93 Mivec hybrid. The B18C has a 84mm size piston which mean it has more bore while maintaining a shorter stroke therefore making it easier to rev.I don't know whether this makes any sense, haha. But that's as much as i can explain.A good piece of advice to some is maybe bore the block out and use 82mm pistons but you really need a mechanic that knows what he's doing or you're basically screwed.</blockquote>

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