Post by flipflopoo1oo on Jul 4, 2014 9:50:20 GMT -6
While cold seems to move to hot more easily, the expansion of gases from heat can be faster than the valves closing quickly! No one builds a fire without dry wood and its good to have a few starter twigs or pine splinters to help get it going! A bit more to reversion than valve numbers for they depend on other factors to be correct! Load, ign. timing, fuel octane (that is the higher the grade the slower it burns), Fuel temps, engine temps, compression ratios, exhaust closing number in relation to stroke and rod length! Yep the old short rod trick helps get rid of the premature, faster piston speed caused by reversion by pushing on the crank sooner with more leverage applied by a quicker rod angle closer to the top with less down force on the bottom end (Main caps)! This is why a short rod motor turns up more quickly! Getting cam specs to rid reversion will never happen I have been told! And you may need a bit if not wanting to much horse power or having no exhaust restriction at all to aide in flow of motion or speed velocity! A cam is only the start of movement! Lifters these days figure in, push rod length to set-up the geometry for rockers of your choice! Tappet clearance is a big part in the overlap separation numbers! .001 is about equal to one lift point degree at the lobe (Depending on each cam's ramps)!5-8 .001s can be a full degree at the crank! A degree wheel is like scales for your car, they can tell you where it is now but that number is just one part in a large scheme of things! Putting too much in or letting too much out, how is a guy suppose to know? A Cold intake and clean exhaust (light gray smut when fingered), Reading each plug with equal indexing per valve location by oil residue on the threads that were not burned away! A loss of vacuum at idol is a loss of low end torque but around 3500 most larger cams with a 106 separation will come on strong! But why wait, just advance it 2 degrees and come off the valves .005 and see what it feels line at 110 separation and less chance of reversion! Then maybe the intake will get colder! This may or not help as to all the other engine factors involved in trying to build horses!