Yella Terra Rockers!!
who uses a comp xer 232-236 with 918's and has realistic goals of revving the motor to 6500+ continuously. im sorry i dont care what they are rated to if ur going to rev the motor that high consitantly and spend the money on an aftermarket rr then why on earth would u skimp and not use a dual spring? the people who are having issues arent using them correctly imo.
Originally Posted by mr2guru
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
https://ls1tech.com/forums/generation-iii-internal-engine/454815-yella-terra-redesign.html
He had the adjustables, which are not the new ultra-lights. Also, the adjusting nut is on the top of the pushrod which is a design I don't personally like because you have to accelerate the adjusting mechanism with the rest of the valve train. I pulled up the 2007 PRI brochure from Yella Terra and the ultra-lights were only in a non-adjustable configuration.
Originally Posted by jub jub
The new Y/T rockers did that just to satisfy the nay-sayers. I don't think there was anything wrong with the old design to tell you the truth. Look at the HS rockers. They have a big nose and you don't here about floating with them.
I did this test on my old 408, from H.S. back to stock....
http://www.cadillacforums.com/forums...-stockers.html
Originally Posted by New Era Performance
I know the new YT's are lighter than the HS . 2c5s , what valve spring/retainer combo were you running (just curious)?
I was running a Patriot Gold combo at the time.
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I know the stock rockers were maybe a bit lighter at the tip , but fixing the problem isn't necessarily right by going back to the stock rocker (fine with a small cam) with a big cam . I am not sure what the lift was on your cam , but that spring is around 135 psi at the seat and around 350 psi at .600 lift , If you had room to shim the springs .020-.030 you would make the spring around 150 psi - 165 psi at the seat and around 400 psi + at .600 lift , or trying the new extreme spring they have out now that is 150 psi closed and 400-410 psi at .600 lift . That would be a better fix for valve float than going back to a stock rocker for a big cam because after time (not sure how much you drive it) usually the trunions on the stock rockers will fail . Small - medium cams are fine with stock rockers , it's the big aggressive ones that should have a rocker upgrade and the right valvetrain components for everything to last a long time , just my 2 cents .
Mike
Mike
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From: Whidbey Island, Wa.
New Era You said that all the new ones had done to them to be different, was a ball end mill used to cut a notch out of them, If I have the resources to do this, witch I do. Would it be fine if I do the same on mine, and it won't affect how they work...
Lane
Lane
Originally Posted by New Era Performance
I know the stock rockers were maybe a bit lighter at the tip , but fixing the problem isn't necessarily right by going back to the stock rocker (fine with a small cam) with a big cam . I am not sure what the lift was on your cam , but that spring is around 135 psi at the seat and around 350 psi at .600 lift , If you had room to shim the springs .020-.030 you would make the spring around 150 psi - 165 psi at the seat and around 400 psi + at .600 lift , or trying the new extreme spring they have out now that is 150 psi closed and 400-410 psi at .600 lift . That would be a better fix for valve float than going back to a stock rocker for a big cam because after time (not sure how much you drive it) usually the trunions on the stock rockers will fail . Small - medium cams are fine with stock rockers , it's the big aggressive ones that should have a rocker upgrade and the right valvetrain components for everything to last a long time , just my 2 cents .
Mike
Mike
I think they may have made some slight geometry changes as well but I am not 100% sure . You will have to remove the roller tip to make the same cut across and remove the same amount of material , I wouldn't do it but that's up to you .
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From: Corpus Christi
yup! I noticed on peeps who are claiming hp/floating valves dont mention what cam size (duration/lift) they are using with these rockers. I'm currently using stock rockers on my 231/237 .589/.595 cam and believe I can gain from using YT due to size of cam. ".02"
fuerzaws6
fuerzaws6
Originally Posted by crazylane
New Era You said that all the new ones had done to them to be different, was a ball end mill used to cut a notch out of them, If I have the resources to do this, witch I do. Would it be fine if I do the same on mine, and it won't affect how they work...
Lane
Lane
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Joined: Mar 2005
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From: Corpus Christi
Originally Posted by New Era Performance
We just wrapped up an 02 zo6 today with a 408 that we ran the Yella Terra Rocker Arms on and revved to 7000 rpms no problem , here is the graph :
looks awsome. I got some sitting at home waiting for me to get home from the dessert.
fuerzaws6
