crank position
crank position
(OP)
why is it that in internal combustion engines the crank is always positioned directly below the pistons? if it was offset would that not give designers latitude to address issues such as detonation / piston speed / rod angle etc?





RE: crank position
RE: crank position
RE: crank position
That hasn't stopped hot rodders from getting high specific power.
http://en.wikipedia.org/wiki/VR6_engine
Mike Halloran
Pembroke Pines, FL, USA
RE: crank position
VW's massive crank offset is mainly imposed by packaging - the principle of a single head for a Vee engine gives the engineers some interesting self-imposed problems to solve.
Then there's engine balancing.
- Steve
RE: crank position
Incidentally the technical term is desaxe, and it has been used on thousands of engine designs, including steam engines in the 1800s.
In theory it can be used for performance reasons, in practice it, or its close cousin gudgeon pin offset, is now used to reduce piston knock when cold.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: crank position
RE: crank position
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: crank position