Quote:
Originally Posted by Soravia
What design compromises did Honda engine use to make power on higher RPM like that? I see that it is a very tall motor.
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I dont think they were compromises more just a different design of engine. Lets think about it this way, generally an engine is developed for a specific range of cars or model. They are designed with a certain demographic in mind i.e. Corolla, 323, Evolution, WRX/STI.
Each has its flaws and its strengths, would you say using a lower compression piston in a WRX compared to a 2ZR-FE a compromise?
The F20C was developed about the time that Honda was on a roll with its engines (at least IMO). The F20 remains one of the best engineered engines to this day (~123 HP a litre) being only eclipsed by the Farrari 458 Italia (by about a HP).
Considering this engine was developed near on 10 years ago I think speaks for itself in how advanced it was. The engines whole design revolves around high rpm and is tuned very well. (In fact many mofications as far as im aware inflict adverse performance on the engine in terms of figures. They may improve aspects of the engine however (i.e. ITBs))
As a result of high rpm the engine has really light pistons (made from Forged Aluminium IIRC), 12-14 pound fly wheel, coated piston skirts, the block was sleeved in fibre of some sort, it also had quite short piston skirts and a wrist pin mounted fairly high up the piston AFAIK.
It also had a tuned intake plenum and a really long rod (153mm much much longer then K20). (I apologise if ive missed something or its incorrect its coming from memory.)