Higher reving engines?

[GrottGunnar]

Is there any possibilty in the future that support for higher revlimit then the current 12k is implemented with abilities to reach it with a resonable powercurve? Currently it's impossible to recreate modern supersport motorcycle engines.

[PlagueFerret]

12,000rpm's is an insane amount of revolutions, you have to consider all the things that go along with that, your stroke being the largest contributor to that. Also the more revolutions you have, in most cases, is going to cause alot more wear and tear to the pistons head, bore, connecting rods, your crank, crank journals, connecting rod journals, to add to it, the angle that your piston is at in comparison to the stroke can cause pre-mature wear at one side of the cylinder wall. Before we get into the 'well motorcycles', yes a motorcycle idles at around 6k rpm's but your talking about a very small bore, and a stroke of usually less than an inch and a half.

A good rpm for any vehicle is 9k (unless your an american vehicle then we seem to aim around 7k with the exception of a few of the more exotic american vehicles). Producing that torque curve has nothing to do with the rpm limit itself, but more towards the length of the stroke and piston size, and your timing.

My recommendation, you want a good torque curve, make the shortest stroke possible, slowly add bore and add/take away timing till you get the curve you want (ie: my vehicle rev's to around 8300rpm's and my curve starts to build at around 2200rpm's). Hope i helped.

[GrottGunnar]

Thanks for your reply.

yeah sure it's very extreme for a normal car engine to go above 10000rpm and the power curve wouldn't be good for drivability for a none superlight car. I'm just asking for the possibility to make a nosense "mini sportscar".

I don't have a problem to design an small engine in current version that makes use of all 12k rpm but I want more and in a realistic manner(as per example the motorcycle engines that makes it happen in a economical and fairly reliable way(like 14k rpm at 1000cc)).
The things I currently seeing holding the rpm's down is first the hardlimit at 12k but also the camtimings and as a byproduct the valvefloat with the overbore required to not have the piston and crank break down.
Currently my engines requires to be almost square to reach the highest rpm optimaly but with bigger engine like 1000cc the valvefloat becomes too high.

I realise that this extension isn't beneficial to 99% of the cars, but would see it as a nice touch. Isn't engineering about pushing the limits? =)

[PlagueFerret]

I do agree that there should not be a 'set' limit of 12k rpm's but i do thing it should be arguably hard to get up that high efficiently, and at 12k+ the chance of failure is just multiplying. As for the floating valves is a spring / lifter issue ;)

[UltimateBMWfan]

Sorry this came so late, I wasn't subscribed to this forum. I am now though! Anyways, the reason it's not higher is that firstly, since it's a car company tycoon game, almost no road going cars have even reached the 12K RPM limit. Also, the other limiting factor is that the engine sounds get skippy and buggy after 12K because of the recording method.