Although all valve events occur earlier, the greatest impact of an advanced cam is to close the intake valve sooner in the compression stroke. The second part, or stroke, in each cylinder is called the "compression stroke." Highly recommend this modification by Kdub » Fri Apr 27, 2012 5:35 am, Post In order for the engine to properly burn fuel, the fuel must be ignited at the proper moment during the combustion cycle. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. matters not whether you win or lose; what matters is whether I win or lose. 1971 short block with the cam that was mentioned. Your engine has a timing belt or chain that does a lot more than take energy from the spinning crankshaft and use it to spin the camshaft or camshafts. Re: Advantages of advancing the cam on a street engine. The first is called cam timing, the second is ignition timing. In some engines, the piston can actually impact a valve at the top of its movement. Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Both of these are moving, and the piston is moving with the explosive oomph provided by the other cylinders in your engine. Retarding the cam timing, increases the power curve - the power curve will start later at a higher rpm. The third stroke is the ignition or combustion stroke (now we're getting somewhere). accelerate (slowly) and was accelerating at the top at 100 kmh (60 mph). If the cam in the motor is the same cam timing as is this you could, advance it by a full 8 deg to improve the low end power. ), This is page one of the instructions (yes it's that poorly photocopied), Round tooth style timing gears on left, square tooth on right. (with this cam you want to advance it by 8deg so the intake closes at 38deg ABDC.) A safe range would be 4 to 6 deg with 6 degree probably ideal. Symptoms of Being 1-Tooth Off on Cam Timing - posted in Advanced Virtual Mechanic: We were having some discussions around the shop regarding what the symtoms would be if you were 1-tooth off on cam timing in either direction (with a stock cam).