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Message: <blockquote data-quote="riggy" data-source="post: 219103" data-attributes="member: 5465">anyways..back to the R3 topic...<a href="http://www.racerallyresearch.com" target="_blank">www.racerallyresearch.com</a> says that the 4g93 engine's bore and stroke is 82mmx89mm. Can anyone confirm this fact? i keep remembering that that the standard bore is 81mm. Does that mean that the r3 is using the oversized pistons? (it comes in 81mm 81.5mm 82mm) note that if you overhaul the engine (or bottom end), mechanics usually use one plus size larger than the original so that it sits well (due to wear and tear of the bore). Now if this is the case with the R3. When you send it for an overhaul (god forbid - if suddenly your timing belt snaps and your valves suddenly come in contact with the piston) you'd have to re-sleeve the block (hence some extra cost)? This would explain where the r3 got the extra 7 horses due to having slightly oversized pistons. So what actually is the displacement of the car (i doubt its 1834cc anymore)? or any R3 user willing to open up their block and measure their pistons? regards.</blockquote>

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