228r and torquer v2 rpm range
#7
+4 is 4 degrees advanced, +1 would be only 1 degree advanced or 3 degrees retarded from +4. Retarding cam timing results in all valve events happening later.... advancing the cam results in valve events sooner. the most influential valve event is intake closing, by retarding cam timing the intake closes later and since duration does not change cylinder pressure will bleed off as the piston comes upward with intake valvestill open, result is less cylinderpressure = less torque at low rpm.
Justin
Justin
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#14
TECH Senior Member
+4 is 4 degrees advanced, +1 would be only 1 degree advanced or 3 degrees retarded from +4. Retarding cam timing results in all valve events happening later.... advancing the cam results in valve events sooner. the most influential valve event is intake closing, by retarding cam timing the intake closes later and since duration does not change cylinder pressure will bleed off as the piston comes upward with intake valvestill open, result is less cylinderpressure = less torque at low rpm.
Justin
Justin
Theoretically yes, but does it really happen that way?