Quote:
Originally Posted by Pampered-Z
johnjzjz,
I have a question, if you can clearify, or enlighten me.
I was always under the impression that all things being equal, a shorter/longer rod has less effect on top end performance as opposed to mid range. Talking general terms, not full on race motor to squeeze out ever HP. Although I'd like to know which would be better.
Also dewell has less effect on a N/A engine then on an engine with a power adder. I assume that cam overlap would be a big factor?
How would overlap be effected on a N/A engine, I was always under the impression on a boosted engine, you want the dewell to help keep the piston up to keep the cylinder area small so that you use the cam overlap to help clear the cylinder and reduce bleeding off boost.
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WOW someone who is thinking - it would take hours to go over all the different conceps that are around about the issue most only know what they read in a comic book ( super chevy and alike ) but it depends on what you need and how strong are the parts - stock block - with power adder you want a long rod < keeps the load off the cylinder wall and lenghtens the dwell time good for torque but not for speed of torque meaning it will be a bit slower winding up on a dyno with a thousanth second timer ploting the motors movement through its pull - and yes a longer dwell helps the motor burn the excess from an adder - and cam timing really comes into play - drag, road racing, boats and modifies all want different things - street play toy buy heavy stuff over kill it because of the reverse loads in play < ??? de acceralation has a greater affect on a motors stress loads than reving it up - NHRA Prostock is a classic example you hear the motor shift and when the shoot is deployed the motor is cut and free wheels because the de cell loads streach the rods bolts in the oposit direction and experence has shown they break in half - compression and over lap go hand in hand you can cut static compression and still have big power using lobe seperation angles as a guide to what your looking for many cam companys only sell to the masses what works with available parts especially today when very few people even know how or what cam degreeing does - i seen a comic book on a shelf one time said brutal power from cam degreeing hahahahahahahhahahahahahah what a crock its in most shops used as a tool to see just wheir the cam ends up with valve to piston clearence and how close is it to what the cam card said it was and in most cases its not even close - ploting an engine is not that hard if you know the place you are going - changing in mid streem is a pain you will never get it all remember that find what will fit the budget and what you plan to do with it most of the time and stay in that loop -- jz