Quote:
Originally Posted by renault_megane_dci
Oil pressure :
car iddle setting is usually a tad under 900 rpm
bikes iddle setting is usually around 1500 rpm
Bike engines usually revs up to 10.000 rpm and up.
Their oil pump has to cope with these high rpm meaning they are either small or under geared or a combination of both, requiring for a higher iddle setting.
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Over-square engine :
just my opinion but the shorter the stroke, the least destabilized it gets at lower rpm.
More cylinders helps too.
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I have two interesting vehicles, then
- The YARDIS idles at 500rpm with 4 cylinder when warmed up. Can be a bit shaky down there
- Teresa idles at ~1500rpm, even though the engine is a short stroke one with a redline of 7k. But she's kind of lacking at the cylinder count department (being a single)