roller rockers 1.9 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

hapisok · 06-13-2012, 01:28 PM

i've seen threads on various roller rockers already, most info is about the yella terra 1.7 roller rockers and very little about SLP 1.85. just want to make sure there will be no valve clearance issues with a 1.9 ratio and if the stock springs will be able to support this. still on the stock CAM...expected to change down the road but not worried about that yet.

going on an LS3

thanks

...

Synner · 06-13-2012, 02:59 PM

1.9 is a horrible idea no matter what, haven't even seen them made. The slp ones only use them if you never do a cam.

hapisok · 06-13-2012, 04:17 PM

any reason in particular as to why they are a horrible idea?

thanks

Synner · 06-13-2012, 04:45 PM

The amount of stress placed on the rocker/spring/pushrod. Even if they give you enough PTV clearance you're begging to break something.

hapisok · 06-13-2012, 07:54 PM

with the 1.85 being in circulation...does .05 compound the stress that much more? what would it take to run 1.90 safely?

Synner · 06-13-2012, 08:00 PM

Personally I wouldn't run either. You're using a lever to move parts and drastically increasing the load on the valve. There's only so much range of motion where the tip can stay centered on the valve end. I would just get a cam with appropriately matched dual springs.

litle88 · 06-13-2012, 10:56 PM

Just get the trunion upgrade don't even think about a 1.9's? Wow never heard of those and the 1.85's you will not be able to use if you get a cam. Just stick to your 1.7's!

flht99b · 06-14-2012, 06:41 AM

FYI, LS7 use 1.8 ratio rockers. No they won't work on an LS3 as the intake rockers aren't offset.
Ed M.

hapisok · 06-14-2012, 07:13 AM

thanks for all the input.

still working on getting more info on these. im aware of possible side loading wear and tear and waiting to hear back to make sure there is no premature wear on the valve stems hoping they've modified the pedestal or cup.

IndeedSS1 · 06-14-2012, 07:30 AM

Quote:

Originally Posted by hapisok

thanks for all the input.

still working on getting more info on these. im aware of possible side loading wear and tear and waiting to hear back to make sure there is no premature wear on the valve stems hoping they've modified the pedestal or cup.

Did your previous car have an L67?

hapisok · 06-14-2012, 08:29 AM

previous was the V6 with the LLT motor. just upsized to the LS3

IndeedSS1 · 06-14-2012, 08:44 AM

Quote:

Originally Posted by hapisok

previous was the V6 with the LLT motor. just upsized to the LS3

This rocker ratio thread brought back memories of the supercharged w-body forums that I came from.

Butcher · 06-14-2012, 03:18 PM

Quote:

Originally Posted by Synner

Personally I wouldn't run either. You're using a lever to move parts and drastically increasing the load on the valve. There's only so much range of motion where the tip can stay centered on the valve end. I would just get a cam with appropriately matched dual springs.

You kind of have it backwards. It will open the valve farther and put more load on the valve spring. However, it will put more stress on the pushrod and the lifter. The distance from the trunion to the roller tip will remain the same. The distance from the trunion to the pushrod cup will be shorter.

I had 1.85 roller rockers on my 2003 Z06. However, I did a complete Comp Cams set up. I used hardened pushrods, studs, poly locks, guide plates, roller rockers and 918 valve springs. It was worth about 10 rwhp and 0 rwtq. I spun that motor to 7200 rpm for 2 years and never had a valve train problem. You could keep those rocker arms with an aftermarket cam. However, you would need to have the lift of the cam lobes reduced to offset the extra lift from the roller rockers.

hapisok · 06-14-2012, 03:53 PM

Awesome...thanks butcher. That was the info I was looking for. Not looking to change out the cam right now as I know I'll have some work finding one that will compliment the 1.9 ratio if i decide to go that route. I am somewhat concerned about the springs and valve float but was told that having minimal miles 15k, I should be fine for now, at least for testing. Down the road I'll update the springs and take a look at pushrods too. Just getting into it and learning a lot. Thanks again.

06-13-2012, 01:28 PM	#1
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	roller rockers 1.9 i've seen threads on various roller rockers already, most info is about the yella terra 1.7 roller rockers and very little about SLP 1.85. just want to make sure there will be no valve clearance issues with a 1.9 ratio and if the stock springs will be able to support this. still on the stock CAM...expected to change down the road but not worried about that yet. going on an LS3 thanks ... __________________

06-13-2012, 04:17 PM	#3
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	any reason in particular as to why they are a horrible idea? thanks __________________

06-13-2012, 07:54 PM	#5
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	with the 1.85 being in circulation...does .05 compound the stress that much more? what would it take to run 1.90 safely? __________________

06-13-2012, 10:56 PM	#7
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	Just get the trunion upgrade don't even think about a 1.9's? Wow never heard of those and the 1.85's you will not be able to use if you get a cam. Just stick to your 1.7's! __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

06-14-2012, 06:41 AM	#8
flht99b Drives: 2010 Camaro 2SS/RS RJT Join Date: May 2009 Location: Knoxville Posts: 1,574 View My Garage	FYI, LS7 use 1.8 ratio rockers. No they won't work on an LS3 as the intake rockers aren't offset. Ed M. __________________ RJT 2SS/RS, AAM 3.70's, MTI Sway Bars, Shifter & SS brake lines, ZLI calipers, rotors & pads, BMR Trailing & Toe Arms, rear cradle & diff bushes, Pedders XA's, Camber/Toe eccentrics, Radius arm inserts, GTO clutch reservoir, LS9 cam, Comp valve springs, Melling 10296 oil pump, CR5 timing chain, LS6 damper, CAI Cold Air Intake, ARH LT headers w/HF cats, GMPP touring axle back, Elite Engineering Catch Can, Forgeline 20x9.5 & 20x11 DS3 whls, 275/40/20 & 315/35/20 tires, 2011 Convertible spoiler, 1LE front spoiler, Lloyd "SS" Floor Mats, GM Camaro Trunk Mat, wrapped console & Grant steering wheel.

06-13-2012, 02:59 PM	#2
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,545	1.9 is a horrible idea no matter what, haven't even seen them made. The slp ones only use them if you never do a cam.

06-13-2012, 04:45 PM	#4
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,545	The amount of stress placed on the rocker/spring/pushrod. Even if they give you enough PTV clearance you're begging to break something.

06-13-2012, 08:00 PM	#6
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,545	Personally I wouldn't run either. You're using a lever to move parts and drastically increasing the load on the valve. There's only so much range of motion where the tip can stay centered on the valve end. I would just get a cam with appropriately matched dual springs.

06-14-2012, 07:13 AM	#9
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	thanks for all the input. still working on getting more info on these. im aware of possible side loading wear and tear and waiting to hear back to make sure there is no premature wear on the valve stems hoping they've modified the pedestal or cup. __________________

06-14-2012, 08:29 AM	#11
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	previous was the V6 with the LLT motor. just upsized to the LS3 __________________

06-14-2012, 03:53 PM	#14
hapisok crazier than a coconut Drives: 2010 2SS/RS LS3 Join Date: Jul 2010 Location: virginia Posts: 1,547	Awesome...thanks butcher. That was the info I was looking for. Not looking to change out the cam right now as I know I'll have some work finding one that will compliment the 1.9 ratio if i decide to go that route. I am somewhat concerned about the springs and valve float but was told that having minimal miles 15k, I should be fine for now, at least for testing. Down the road I'll update the springs and take a look at pushrods too. Just getting into it and learning a lot. Thanks again. __________________