Originally Posted by bad1999gtp
stock rockers are 1.6 or do you mean switching to 1.6. I'm running my stock rockers now and did with the S1X as well.
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01-11-2008
stock rockers are 1.6 or do you mean switching to 1.6. I'm running my stock rockers now and did with the S1X as well.
01-11-2008
Factory rockers after 1999 are 1.66 ratio. 96-98 rockers are 1.6
01-11-2008
So the 1.6 rr ZZP sells are smaller ratio that most of us have stock. Good to know.
01-11-2008
Since they are aluminium they'll have no deflection and will make more power than a stock rocker with someone who is heavily modded.
XP cam also like the turbo cars too
01-11-2008
That deflection nonsense has got to stop, the stock rockers don't deflect.Since they are aluminium they'll have no deflection and will make more power than a stock rocker with someone who is heavily modded.
XP cam also like the turbo cars too
01-11-2008
Agreed. Ron showed me the light on this too. If you are talking about the old school stamped crap like I had in my stock SBC, yes, I could see how that piece of junk could deflect. But after getting my modded stockers recently, they look well engineered to my untrained eye. Metal can flex more than you'd intuitively think, but I would not worry about those suckers doing that at all. I'd think the push rod or something else will give first.
That ZZP test is depressingly short on details. How they came up with the disparity in lift could have come from something other than the rockers. Not to mention they were testing the 1.9 with a #130 spring. I don't imagine many people have that combo. Even if it is accurate, they claimed the effective ratio was 1.87 on the 1.9. Close enough for me.
01-11-2008
Something else to think about with that combo is that these engines have hyrdaulic lifters that will have some give to them. Outside of using a solid lifter how can anything be obtained worthy of saying the stock rockers cant take the heat? More friction to push the valve open means more pressure against the lifter, where a full roller rocker has a roller tip allowing less stress on the valvetrain. Sure there are better rockers out there than stock ones and roller tips will certainly reduce friction but I think there are other things to worry about in the power loop unless spending a few extra greenbacks isnt a concern and you want ever last bit of help.
01-11-2008
Not even on 130#'s ?I was thinking of going to aluminium 1.6's because I thought they'd net me some power with an IS3 and 130# springs ?
01-11-2008
Probably wouldn't see any power difference...well maybe 3-4 HP; but it will help prolong the valve guides from wearing prematurely.Not even on 130#'s ?
01-11-2008
This not apply to the JP?Remember, if using the Rollmaster, it was developed for the L36, so it may be retarded 2 degrees when installed straight up in an L67.
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