Anyone care to share the pros and cons of the using either....my limited understanding is that 1.6's will benefit the intakes....increase lift by .030....BUT there is are some reasons that I dont fully understand and know that 1.6's could harm you in some cases. What are those cases?
If the cam is too big to start with. The rocker swap is great if the cam is undersized, but if the cam is too large, it will make it worse and kill bottom end.
Rocker arms are like levers.........the higher the ratio of arm, the harder it is to turn over. Now the difference between a 1.5 and a 1.6 in your normal everyday street stuff, I doubt you will see much of a difference as far as being hard on parts.
But when you start getting into big lift stuff you need to find a balance of base circle, lobe lift, and rocker arm ratio. When we started working on my stuff, we ran into this. do I want a .433 lobe with a 2:1 ratio, or a .468 lobe with a 1.85:1 ratio or a .541 lobe with a 1.6:1 rocker. We ended up with a 1.85 ratio arm, and it has proven to have worked, at least in testing. (No road time yet) 75+ dyno pulls, and hours on the spintron.
I hope my rambling is making a little sense Aaron, here is a video of Richard Maskin(owner of Dart)talking about valvetrains and rocker arm ratio. He also focuses on how everyone uses too much spring pressure . It is a good deal to watch. This guy doesn't read the book and learn....................HE WRITES THE BOOK!!!
Why is it interesting??? It can be done........no doubt in my mind. Here is my lobe. .866 lift at the valve. ~140/~580 seat and open. 272°/286° dur at .050.
Peak HPish.....
Aaron, just so I am clear. I am not saying that everyone should cut there spring pressure in half. I am saying that it can be done, but you need to take everything into consideration when doing this.
You are going to need more information. I "think" you will be ok, but I wouldn't bank on what I say anymore, especially after working with Tom. I ran a SR with 276/286 @ .050 and .640/.645 with 250/650 for 5000 miles with no problems, but your cam and my old cam could be very different. It is all in the lobe intensity and the weight of the parts you are using.
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