You rev to 8 k ? thats something I wanna start doing. Why from an architecture standpoint do you think its not a good idea?
The N54 is an undersquare design. It is not square or over square. It will never be a 'high' reving motor because of that. The head is also a limitation with the valves but that is a different issue. That being said 8160 is still decent. 8160rpm limit comes from the DME hard limit. I don't think most have pushed much past that with standalones. If they have they don't talk about it. Regardless it will always be a rev limited motor.
Some reading:
en.wikipedia.org
An
oversquare engine allows for more and larger valves in the head of the cylinder, higher possible rpm by lowering maximum piston speed, and lower crank stress due to the lower peak piston acceleration for the same engine (rotational) speed. Because these characteristics favor higher engine speeds,
oversquare engines are often tuned to develop peak torque at a relatively high speed.
An
undersquare engine at a given engine speed, a longer stroke increases engine friction and increases stress on the crankshaft due to the higher peak piston acceleration. The smaller bore also reduces the area available for valves in the cylinder head, requiring them to be smaller or fewer in number. Undersquare engines exhibit peak torque at lower rpm than an oversquare engine due to their longer crank throw and high piston speed. Undersquare engines have become more common lately, as manufacturers push for more and more efficient engines and higher fuel economy.
BMW N54 vs Toyota 2JZ-GTE comparison. N54 and 2JZ tuning, performance, and daily driving. Is the famous 2JZ a better tuners car than the BMW N54?
bmwtuning.co
Here is a list of the top 5 highest production piston speeds:
1. Honda S2000:
Engine Code: F20C1
Bore/Stroke: 3.43" X 3.31"
Redline: 9000rpm
Piston Speed: 4965 Ft/min
2. Lamborghini Gallardo
Engine Code: N/A
Bore/Stroke: 3.25" X 3.65"
Redline: 8000rpm
Piston Speed: 4866.67 Ft/min
3. Acura Integra Type R
Engine Code: B18C5
Bore/Stroke: 3.19" X 3.43"
Redline: 8400rpm
Piston Speed: 4802 Ft/min
4. BMW M3 (Germany)
Engine Code: S54
Bore/Stroke: 3.43" X 3.58"
Redline: 8000rpm
Piston Speed: 4773.33 Ft/min
5. Honda S2000 2004
Engine Code: F22C
Bore/Stroke: 3.43" X 3.57"
Redline: 8000rpm
Piston Speed: 4760 Ft/min
The n54 piston speed reaches 4708 at 8k
There is plenty you can read up on about piston speed, rod angle, etc.
An intense look at crankshaft stroke and its effect on piston speed, inertia, and controlling the massive, destructive forces at work inside an engine. What's really going on inside your oil pan? We'll show you!
blog.wiseco.com
Piston speed generally refers to the average or mean speed of the piston as it moves up and down in the cylinder bore during each crankshaft revolution. Since the piston actually comes to a complete stop at the top of the stroke (TDC) and at the bottom of the stroke (BDC), its speed and...
www.musclecardiy.com
Power and efficiency are up. But if you want to know the full story of how the internal-combustion engine is evolving, you have to cross-examine the pistons.
www.caranddriver.com
An n54 making 750whp is making 250whp per liter of displacement at 7200 rpm. That is pretty damn good and doable with stock cam and head. Something most other 3l powerplants can't do. At least not 3Ls back in 2006 when the n54 was released.
