hughes412

I am 90% sure I am going shorty and then have the rest straighten as much as possible and run a high flow cat. That should be good enough exhuast for NOS. I want atleast 75 shot. Has any one ran a 100? I want a little something for the $@# hole hondas. Don't get me wrong not all H boys are asses, just some think they can't be beat!!

juddz

A more agressive set of camshafts will have greater lift and duration.

Lift means that it will open the valves further, which will allow a greater opening between the valve seat and the valve skirt. This allows a greater volume of air/fuel in on the intake side, and a greater volume of exhaust out on the exhaust side.

Duration is how long the valve is open. The longer it is open, the more air/fuel it can draw in, etc.

This greater breathability greatly enhances horsepower. However, additional valve overlap can (will) cause a deterioration in idle quality (which you will percieve as an increase in vibration). Also, a set of too aggressive cams can cause valve "float", where the ramp-up speed of the valve is too great, and it will literally bounce off the cam lobe. This can cause numerous problems, such as spring breakage, or (especially on the exhaust side) an increase in the potential for detonation (since the exhaust valve is about the hottest part of the combustion chamber, and it cannot transfer heat to the water jackets unless seated). Both of these conditions destroys engines. For that reason, an especially aggressive set of cams requires more durable springs, and to lessen the inertia on the valvetrain, lighter retainers. These two steps will also increase the redline of the engine.

A set of aftermarket cams can be risky for the above reasons, so it is important to do your homework to determine how aggressive you want them, how much powertrain refinement you expect, and what else needs to be done to the valvetrain in order to maintain long term durability.

kargoboy

very nice explanation, juddz.
hughes, I'll admit I know very little about NOS and I'll prolly never go that route, BUT, isn't 100
a little much for our fragile little stock internals?
I think Matty was only even running 50....

hughes412

Yea I heard something about the rods being weak, Befor the nos I will redo the botton and go with better rods and pistons. As money allows. I have also heard 75 is the most on a stock set up.
I really don't know much about it either, Im use to running NA V8 that didn't need the xtra go juice.