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intense cams

Meemperor said:
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 :D
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That deflection nonsense has got to stop, the stock rockers don't deflect.
 


Ron, Im glad you posted about that because I remember a video or something you posted over on CGP that went towards showing that. I remember that part, but I also remember a part of it showing a sleeve or something around the spring that was supposed to help with harmonics or something along that line (its been a while). Can you post that over here or pass along the info on that valve spring sleeve or whatever it was.
 
Ron Vogel said:
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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I must have been living under a rock...why have I not heard of this? It's deffinately good information to know. Next setup is going to basically involve a beefed up L26 bottom end.....does this still apply? Or will it need to be installed at the TDC that shows on the cam.
 
Ron Vogel said:
That deflection nonsense has got to stop, the stock rockers don't deflect.
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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.
 
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.
 


Meemperor said:
Not even on 130#'s ? :confused: 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 ?
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Probably wouldn't see any power difference...well maybe 3-4 HP; but it will help prolong the valve guides from wearing prematurely.
 
Ron Vogel said:
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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Wow, that's news to me. What effects would 2* of retarded timing do? I have since gone back to stock cam with stock gears and a new stock timing chain.

I'd like to see some pics.
 
Would give better top end, but blows a lot of cyl pressure out the exhaust. Retarding the cam moves the powerband up, advancing moves it back down. Good way to maximize a combo.

Betcha a lot of guys would pick up a few tenths by advancing the Rollmaster that 2 degrees, although I wouldn't mess with cam timing without a degree wheel and clay on the pistons.
 
Ron Vogel said:
Would give better top end, but blows a lot of cyl pressure out the exhaust. Retarding the cam moves the powerband up, advancing moves it back down. Good way to maximize a combo.

Betcha a lot of guys would pick up a few tenths by advancing the Rollmaster that 2 degrees, although I wouldn't mess with cam timing without a degree wheel and clay on the pistons.
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Do you know if this timing difference applies to only the Rollmaster or JP as well?
 


I have no idea. All I know is the rollmaster was developed from the L36, so it's based off it's timing set. The JP may have been off of either. Would be nice info to know though.
 
From JP's website:

JP 5619 to suit V6 231 L36 & L37 inc supercharged single row set.


JP 5620 to suit V6 231 L36 & L37 inc supercharged double row set.

JP 5619 - is the one Intense sells and that I have on my car. Hmmm wonder if that's why my car feels sluggish at lower rpms.
 
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