Rotary engine maximum theoretical revs
Discussion
We all know how to get more power out of a car and that is more revs = more power.
Now in a 4 stroke engine (road going at least) the limitation in max revs is valve bounce or taking it to F1 levels they managed 22,000 rpm.
However a rotary is a single moving part an engineers dream now road cars rev to what 9/10,000 rpm what is the maximum revs these could do ? Also why are no owners modifying then by upping max revs?
Now in a 4 stroke engine (road going at least) the limitation in max revs is valve bounce or taking it to F1 levels they managed 22,000 rpm.
However a rotary is a single moving part an engineers dream now road cars rev to what 9/10,000 rpm what is the maximum revs these could do ? Also why are no owners modifying then by upping max revs?
With the rotary you're probably limited by the speed that the rotor housing can be lubricated, more rpms, the more/faster lubrication required?
The rotary is already fairly hi revving, and i doubt owners want to keep paying out for £2000 rebuilds, when they happily make a safe 350 bhp with a bit of mapping.
The rotary is already fairly hi revving, and i doubt owners want to keep paying out for £2000 rebuilds, when they happily make a safe 350 bhp with a bit of mapping.
orangesrule said:
With the rotary you're probably limited by the speed that the rotor housing can be lubricated, more rpms, the more/faster lubrication required?
The rotary is already fairly hi revving, and i doubt owners want to keep paying out for £2000 rebuilds, when they happily make a safe 350 bhp with a bit of mapping.
£2k for rebuilds... You can buy a complete good road worthy car for £1.5k....The rotary is already fairly hi revving, and i doubt owners want to keep paying out for £2000 rebuilds, when they happily make a safe 350 bhp with a bit of mapping.
350bhp from a remap and £1.5k purchase price tis a good buy
Welshbeef said:
£2k for rebuilds... You can buy a complete good road worthy car for £1.5k....
350bhp from a remap and £1.5k purchase price tis a good buy
Show me where?!350bhp from a remap and £1.5k purchase price tis a good buy
You might get a nearly dead rx8 for that money, but certainly not a twin turbo rx7 fd3s (which was what i was referring to) these days.
Mr2Mike said:
Welshbeef said:
We all know how to get more power out of a car and that is more revs = more power.
Not quite...more airflow=more power, and airflow can limit the maximum useful RPM before mechanical limits are reached.One way to improve rpm is to downsize the engine. Lower inertia and less required airflow.
Limits on revs:
- Mechanical limits (i.e. strength of components)
- Airflow limits (simply not enough ability to flow air in or out the engine)
- Thermal limits (laminar flame speed limits reached - can't burn fuel fast enough)
I'm sure hat the maximum engine is, but I do not that at much over 10,000 rpm, there are problems with the rotor gear slipping out of position in the rotor, which leads to a very broken engine very quickly.
On the race engines, the rotor gear was pinned in place to prevent it.
787B made it's maximum power at 9k if that helps
On the race engines, the rotor gear was pinned in place to prevent it.
787B made it's maximum power at 9k if that helps
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