Quote:
Originally Posted by serialk11r
People seem to say that aluminum connecting rods are not good because aluminum has bad fatigue resistance, but virtually all pistons are aluminum, and people don't seem concerned about replacing those? Aluminum conrods would save a lot of weight over steel ones if done right...and allow for higher revs 
By geometry, what do you mean exactly? (sorry if this is a retarded question) |
Geometry: see slider crank model and that'll start to give you some perspective.
Aluminum does have it's place in the engine world and as a connecting rod, it's a short term use. The comparison to a piston, think of the loading area of a piston (both sides of the wrist pin) where the rod only has it's cross sectional area. Now the piston's forces is only part of what the rod sees.
Quote:
Originally Posted by WingsofWar
the problem with aluminum conrods is the tensil strength...they can get as good compression load as 300m forged rods.
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That's a very important to keep in mind. All rods will act like a spring (to an extent) however the stiffer material will absorb less of your combustion force = more force on the crankshaft.
I like my 300M rods
