Cant get my engine to rev.

[PistonAddiction]

f1 engines are very small v8's. they also run pneumatic valves and not springs in there heads. f1 engines don't make any torque at all. they mainly use rotational torque.

[pyrlix]

Why not trying to make something SOMEWHAT reasonable? I never saw a 5.4L I4 in a passenger car nor truck...

You complain why your engine fails, but you fail to understand the easy failure messages the Engine Designer gives you. There is a reason why engines with a High Stroke tend to have quite low RPMs... just start smaller and try to understand whats going on

[bodi]

Yeah, 15:1 compression is there as it may become relevant with better fuel systems if we add any, and if we have LPG, E85 and other fuels like that eventually

That would be really cool, I can't really remember any "flex fuel" car made in the last few years here, Brazil, with a compression ratio lower than 12:1. Most new cars are around 13:5.1 and still MPFI, not a single DI engine sold here yet, and I saw a few drag racing cars with 14.5+:1 running 100% ethanol and some crazy power figures for naturally aspired engines .

[RobtheFiend]

The engines in the Audi R8 have a 92.8mm stroke with a maximum rpm of 8700, at that speed the piston does 26.9 m/s.
So some sporty road engines can cope with such a high piston speed, but more normaly a 24 m/s speed is usually maximum.

That meens that the Audi RS6 engines, both the old v-10 and the new v-8 (89mm stroke), should be capable of 9000 rpm.... nice.

[Daffyflyer]

That meens that the Audi RS6 engines, both the old v-10 and the new v-8 (89mm stroke), should be capable of 9000 rpm.... nice.

As long as the valvetrain can be made to play along with such revs, which these days seems to be fairly achievable