As chipg56 eluded to, in the tech they measure the highest position the piston reaches, so the crank pin location is irrelevant. So in other words TDC in tech is determined when piston is at the highest point above the block deck surface.Can a crank be ground in a way where before tdc the piston goes up higher then at actual tdc?
and is tech done at tdc only?
Help me understand, you want to know if the piston can go higher once it's gone as high as it can go??Can a crank be ground in a way where before tdc the piston goes up higher then at actual tdc?
and is tech done at tdc only?
Good stuff, as piston location, dwell and piston velocity changes the torque and camshaft design design changes. Back in my Chevy SB race engine building days ( late 70's ) we studied the stroke vs rod length ratio and how this affected the piston velocity and crank angle when max velocity occurred.For a real kick, offset wrist pin .050 to the side opposite rotation and look at piston dwell in degrees between .050 before and .050 after tdc vs straight up.
http://blog.wiseco.com/what-is-wrist-pin-offsetA little info from piston manufacturer.
Couple guys on here believe clone cam design has progressed to the ultimate already.Good stuff, as piston location, dwell and piston velocity changes the torque and camshaft design design changes. Back in my Chevy SB race engine building days ( late 70's ) we studied the stroke vs rod length ratio and how this affected the piston velocity and crank angle when max velocity occurred.
Steve