What gives more bottom end ... short stroke or larger bore? What are the benefits/disadvantages of either?
Brian
Original Post
Replies sorted oldest to newest
What gives more bottom end ... short stroke or larger bore? What are the benefits/disadvantages of either?
Brian
Brian
Brian,
Typically, in any engine, a longer stroke produces more torque (and as a result higher h/p) at lower rpms.
Typically, in any engine, a longer stroke produces more torque (and as a result higher h/p) at lower rpms.
Stan is right that a longer stroke (given the same variables) will produce more torque as the crankshaft has a longer moment arm (force = effort times distance). However, torque is also dependent on volumetric efficiency (cylinder filling with combustible mixture) so the right cam, valves, ports, and ignition timing can also increase torque (through increased brake mean effective pressure, or BMEP).
Longer stroke engines also register higher piston speeds than a same-displacment engine with shorter stroke and larger bore. This is a wear/longevity and temperature issue.
(Message Edited 3/24/2003 5:43:34 PM)
Longer stroke engines also register higher piston speeds than a same-displacment engine with shorter stroke and larger bore. This is a wear/longevity and temperature issue.
(Message Edited 3/24/2003 5:43:34 PM)
Stroke it!
take it 78 and be happy.
take it 78 and be happy.
Are you concerned about that black speedster with monster engine posted in pics recently?
Holy shit!
MM
Holy shit!
MM