crazylane

iTrader: (19)

Well I bought and paid for a set, so hopefully they work out.

I was also thinking about takeing some material off of them and see how they work. I have the equipment to do this, so I would like ot see what the outcome would be. Experiment alittle. And then give you guys a good breakdown, on what I will do to the rockers to make them lighter, But I am going to have to wait until I recieve them that way I can make a good judgment on where to take material off at.

Lane

bfhawki

I wouldn't remove any material. I am sure that if YT could have made them lighter without causing any reliability issues, they would have. If you grind on them, you could cause places where stress cracks could start which could cause parts failure, and then who knows where all the pieces end up in your engine. You are worrying to much about this, just put them on and go have some fun. Trust me, they look great when you get them and have to be a ton stronger than the stockers.

crazylane

iTrader: (19)

allright, Sounds good,

My plan was not to grind on them, but to mill on them, I was actually thinking about puting them in my CNC, and using a ball endmill, and shaving some off. But thats why this site is here, for your guys opionions. Thanks

lane

vettenuts

iTrader: (4)

Weight is a poor measure of how rockers will affect the valve train performance. Rotary inertia is what you need to evaluate with weight over the nose being an indicator but not the final answer as rocker stiffness will also play a role in performance as well. An aftermarket rocker could weigh more than stock but the increase may be due to bigger bearings which have little affect on the inertia of the rocker. Removing material without understanding the stress field is a recipe for disaster and I always get a chuckle out of the LS1 Performance book where they ground the rockers in the worst possible location to clear some valve springs in one of their example installations, wonder how long those will last.

Rob

iTrader: (6)

I just put these on the other day. So far I love them. They quieted the valvetrain down immensely, which is what I was after. If they add power that is a plus but I really don't care. I was looking for quiet and got it

Patrick G

iTrader: (14)

I have some of the new-style Ultra Light Yella Terras sitting in a box. I hope to install them in a few weeks.

PREDATOR-Z

What other cam combo are you cooking Patrick? You wouldn't be going solid roller by any chance

Patrick G

iTrader: (14)

Not solid roller Mark, but I am going to turn the power notch up a bit (with stock cubes).

JDM74

I run old style YT's with patriot gold's to 6800 with no valve float what so ever. F13 cam.

PREDATOR-Z

I wish I was back home, it would be nice to meet you and throw some crazy ideas back and forth.
I have something in mind to do over the Summer (since it is too hot to race), I think i'm gonna test one of these "reverse" that I had discussed in a previous thread.

Ryan02SS

iTrader: (3)

I also run the old style since 03 with Patriot Duals. Shifts for max power are 6500rpms, rev is at 6800. No tell tale signs of valve float. People that have had problems with float where running springs on the edge of being able to control the cam specs. If you run the correct spring pressures for your cam there should be no problem.

Hawkn01

iTrader: (1)

I've ran the old style YT's since they first came out with no problems. They are being used with comp 977 dual springs. I go through the traps @ 7400 rpms with no float problems at all.

crazylane

iTrader: (19)

Are these the newer style rockers, that Yella Terra has out. Or are they the old ones.


[IMG][/IMG]
[IMG][/IMG]

vettenuts

iTrader: (4)

Old ones.

ls2 bait

iTrader: (11)

yep those are the old style ones.

Mike @ New Era

iTrader: (10)

The new ones are ball milled across the top from the trunion to the tip for weight reduction on the end of the rocker (around 5 ounces lighter) .

studderin

iTrader: (28)

new
http://www.neweraperformanceparts.co...ge/ytls1rr.JPG
http://i2.photobucket.com/albums/y11...n/P1010075.jpg

mr2guru

iTrader: (16)

Do they change pushrod length required at all?

vettenuts

iTrader: (4)

Has anyone done a before and after on these rockers (the new ones), I read on another board from a vendor that they lost power with these when they put them on. They were also selling a different brand so I am trying to gauge how good that information is. Just a point of curiousity for me as they are a very nice looking setup.

mr2guru

iTrader: (16)

Yeah, I had asked about these last year and got negative feedback from the austrailian guy who used them.

https://ls1tech.com/forums/generation-iii-internal-engine/454815-yella-terra-redesign.html