F4R 830 crankshaft

majki said:

This is in the meantime solved. FYI the crank from the meg 225/230 is a direct fitment into the clio 197 engine. Just to notice is that the meg crank is heavier (engine spool is slower but revs go down slower.

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That’s to be expected, the Megane is a lower revving engine and also will be stronger to take extra forces of boost, your power curve will be effected a little also, it will make power a bit lower and perhaps have a little more midrange, but not too noticeable I take it the throw is identical as they are both two litres and bore etc is identical

Are you sure that is going to be in the crankshaft? The easiest way to effect this would be in flywheel mass or engine management.

NickD said:

Are you sure that is going to be in the crankshaft? The easiest way to effect this would be in flywheel mass or engine management.

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Not sure who your asking, but assuming it’s me... all rotating parts will effect ability to rev, torque for driving up hills, and drive ability... so in the same way as lightening a flywheel will enable an engine to rev quicker, potentially ruin an idle etc, making the flywheel heavier will have the opposite effect, the same goes for a flywheel whether lighter or heavier the same applies

My point is, if these components are interchangeable, so journals, spacing, flywheel mountings are all going to be in the same place. The only mass variation would then be in the size of the connecting webs between and in the flywheel mounting. It would be logical from a complex component overall cost point of view, including, stocking, spares and everything else to use the same component in both engines. That is not to say that is the case, but logical, particularly as the rim weight of a flywheel or by programming the ECU to give a slower over run is a far easier way to change this.