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Experiences/thoughts with 1.85 rockers?

This is a discussion on Experiences/thoughts with 1.85 rockers? within the Internal Engine forums, part of the LSx Technical Help Section category; Am thinking of adding SLP 1.85 rocker arms to my 2000 A4 C5. I have a low lift .525 .531 ...

  1. #1
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    Experiences/thoughts with 1.85 rockers?

    Am thinking of adding SLP 1.85 rocker arms to my 2000 A4 C5. I have a low lift .525 .531 XR269HR Comp Cam. My understanding is that the rockers will add about 12rwhp (peak) and about 15-17 ftlbs rwtorque (peak) on a stock engine, so I expect q little more with my setup. I understand the rockers have a fairly significant effect on "under the curve" power and torque. I do not want to change cams again, and thought this may give me just about what I want from the car. I have a great low end and the car pulls very hard. I had 3.73s in the car and it was really difficult to launch quickly on street tires. They just wanted to spin. I switched to 3.42s in the hope the car would be easier to launch quickly off the line. I was hoping the rockers may help regain some of the midrange jump lost to the gear change and give me a little more up top. I realize there's a lot of knowledge on this site so any input would be greatly appreciated. Thanks!
    Ed

  2. #2
    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by c5xtasy View Post
    Am thinking of adding SLP 1.85 rocker arms to my 2000 A4 C5. I have a low lift .525 .531 XR269HR Comp Cam. My understanding is that the rockers will add about 12rwhp (peak) and about 15-17 ftlbs rwtorque (peak) on a stock engine, so I expect q little more with my setup. I understand the rockers have a fairly significant effect on "under the curve" power and torque. I do not want to change cams again, and thought this may give me just about what I want from the car. I have a great low end and the car pulls very hard. I had 3.73s in the car and it was really difficult to launch quickly on street tires. They just wanted to spin. I switched to 3.42s in the hope the car would be easier to launch quickly off the line. I was hoping the rockers may help regain some of the midrange jump lost to the gear change and give me a little more up top. I realize there's a lot of knowledge on this site so any input would be greatly appreciated. Thanks!
    Ed
    Be careful with adding Rockers to a cam car already. Rockers open the valves further and with a cam doing the same thing, you don't want to ram valves into pistons. Why didn't you get some DR's (Drag Radials) to help hook off the line better and keep the gears.

    What other mods do you have?
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    Quote Originally Posted by blackSS01 View Post
    Be careful with adding Rockers to a cam car already. Rockers open the valves further and with a cam doing the same thing, you don't want to ram valves into pistons. Why didn't you get some DR's (Drag Radials) to help hook off the line better and keep the gears.

    What other mods do you have?
    Thanks for the comeback. Here's the way the car is set up:
    2003 LS6 heads w/Lingenfelter springs, Comp Cam XR269HR, LS2 timing chain, LS6 intake/injectors, open foglight shrouds, Blackwing, WCC powerbridge, screenless MAF, Air Inlet Temperature sensor relocated to Blackwing, Shaner P&P throttlebody, Dynatech longtubes/hiflo cats/X-pipe, GHL Bullets, Hayden trans cooler, Yank SS3200 stall, 3.42 gears, dynotuned by Doug Rippie of DRM Motorsports, Hawk HPS brake pads, etc.

    The reason I don't really want to go with drag radials is we do a pretty fair amount of long distance travel around the country with the car every summer. It has tons of torque and too easily rolls the tires when trying to launch rapidly. I was just hoping the rockers would fatten up power and torque "under the curve" thereby adding power and torque to the midrange and top end to make up for the gear change, without compromising the low end. That's my hope anyway.
    Ed

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    be carefull, call the manufacturer of the cam and give them the specs and they will be able to tell you the total lift after adding the 1.85s. if you are running stock valve springs and are determined to run the 1.85s, get ready to change you valve springs......the excess lift will colapse them.

  5. #5
    cutting and welding mark21742's Avatar
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    .571/.578 would be your new lift....if you've got comp 918 springs or better in there you'll be fine

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