Quote:
Originally Posted by Ecky
Thoughts on de-stoking a K24? The extra deck height would give a better rod:stroke ratio. I'd need longer rods. I think the extra dwell time at the top of the stroke improves efficiency, but it might also make it more likely to knock at very low RPM.
|
Destroking sounds like too much effort for the result :P You'd have a rod/stroke of 1.919 which is pretty awesome though I suppose.
I don't think very low speed knock is a problem, ignition timing is already very delayed there since there's a relative eternity for the flame front to propagate.
The two situations where I like the idea of destroking are:
1. If you have lightened the piston assembly considerably, you can increase the rod big end stiffness by reducing its diameter and destroke a teeny bit at the same time.
2. If the manufacturer uses the same size crank case and drops in different sized cranks, you can go to the bigger crank to increase stroke to make better use of the engine's mass.
I suppose if you're displacement restricted for some reason, then doing a really drastic destroke and then milling away a lot of excess material on the block is a good way to get a very undersquare engine, but it feels like a waste.