Yella Terra Rockers!!
03-17-2007, 11:22 AM
#41
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.
03-18-2007, 07:49 AM
#43
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.
03-18-2007, 08:12 AM
#44
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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
03-18-2007, 08:39 AM
#48
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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.
03-18-2007, 09:17 AM
#51
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
03-18-2007, 09:25 AM
#52
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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
03-18-2007, 09:36 AM
#53
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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
03-18-2007, 09:38 AM
#54
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 .
03-19-2007, 01:36 AM
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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
03-19-2007, 05:06 AM
#57
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
03-20-2007, 02:12 AM
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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
