e-cam with 1.7 RR's on a 331???

[83GTMUSTANG]

Would An X Or Z Cam With 1.6 Rr's Do The Same To Your Valve As A E Or F Cam With 1.72 Roller Rockers?????

[HotRoddin]

Originally Posted by 83GTMUSTANG

Would An X Or Z Cam With 1.6 Rr's Do The Same To Your Valve As A E Or F Cam With 1.72 Roller Rockers?????

If I understand your question correctly, yes ... There are just a couple of different ways to get extra lift. One is buy a more agressive cam, and install it, which gives you more lift by having physically bigger lobes ... that would be your X or Z cam ... the other way is to keep the cam you have and just change the pivot point on the rocker arms (higher rocker ratio), the drawback to the more agressive cam idea is, you have to buy a new cam and install it ... the drawback to the higher rocker ratio method is it puts more stress on your valve train componets.

Rod

[~The Jester~]

Originally Posted by 83GTMUSTANG

Would An X Or Z Cam With 1.6 Rr's Do The Same To Your Valve As A E Or F Cam With 1.72 Roller Rockers?????

No. That's what they're trying to tell you guys. A "bigger" cam is actually less strain on the components than a "smaller" cam with bigger ratio rockers. It's all physics, and leverage more specifically.

Think of the grade school teeter-totter. 300# kid on one end, and my 100# azz on the other. Put the fulcrum in the middle, and not such a big deal. But the closer to the fat kid that the fulcrum gets, the more effort is needed to get the fat kid off the ground. Same 100# azz on the other end, but the pivot has moved.

Take the 1.6 rockers, and do nothing else but replace them with 1.7's and you add a BUNCH of stress, forces, wear & tear on the valve train. You moved the pivot point closer to the fat kid. Plain and simple. Yes, you get more lift/duration for an inexpensive easy fix. But in this game the inexpensive/easy way will ALWAYS bite you in the azz. Name one other time that the cheap/easy way was the way to go.

[fiveOguy20]

Originally Posted by ~The Jester~

No. That's what they're trying to tell you guys. A "bigger" cam is actually less strain on the components than a "smaller" cam with bigger ratio rockers. It's all physics, and leverage more specifically.

Think of the grade school teeter-totter. 300# kid on one end, and my 100# azz on the other. Put the fulcrum in the middle, and not such a big deal. But the closer to the fat kid that the fulcrum gets, the more effort is needed to get the fat kid off the ground. Same 100# azz on the other end, but the pivot has moved.

Take the 1.6 rockers, and do nothing else but replace them with 1.7's and you add a BUNCH of stress, forces, wear & tear on the valve train. You moved the pivot point closer to the fat kid. Plain and simple. Yes, you get more lift/duration for an inexpensive easy fix. But in this game the inexpensive/easy way will ALWAYS bite you in the azz. Name one other time that the cheap/easy way was the way to go.

since when did 1.7s increase duration?? lol. they only increase the lift. am i the only one who caught this?