Quote:
Originally Posted by GirlyScions
Low reving boosted engines are safer than high reving boost engines.
Just think how much power subaru's turbod fa20 would make at 7.5k!  |
What you need to consider if you are building a motor that revs at a high level is Rod to stroke ratio (foced induction does not play into it), because as you increase piston speeds the side load on the rotating assembly increases.
This increase in side load is the same whether the engine is seeing boost or not, if the engine is completely devoid of both pre-ignition, and detonation (both of which are the only events that can increase side load when using FI) than the addition of boost (or pressure) in the cylinder will not increase side load. The additional pressure will act perpendicular to the rotating assembly at this point, and only increase cylinder pressure, or the pressure on the piston face. I would also like to point out that the pressures (8-10psi) that the turbo, or supercharger add to the cylinder fail in comparison the the pressures the cylinder has to endure once combustion takes place.
If what you say is true, than we wouldn't have any 13b turbo motors reving past 10k, RB26 motors reving past 9.5k, 4g63 motors reving past 9k(I currently have one running 26psi), b16 motors reving past 10k, b18 motors reving past 9.5k.....
I hope my point is made.
G