1.8 rockers vers, Cam???

[Smart Line]

first off YES I LOOKED!!!!
Quote:sorry no results found End Quote:

1. Sorry - no matches. Please try some different terms.

Ok so who has done both on some cars....
what are the benafits of the 1.8 rockers.
Is a cam a better choice and why?
I may go FI but not for a year or two.
By then i may just go ith th LSX7.N/A
any help would be nice THANK's......

1. Sorry - no matches. Please try some different terms.

[litle88]

Your current cam specs on 1.7 rockers--- - -----204/211 .551/.525 117

After a 1.8 rocker it makes the cam seem bigger 204/211 .583/.556 117

http://wallaceracing.com/Calculators.htm

Yella Terra and SLP? have 1.85 as well, BUT if you or when you go with a cam then the 1.8's might not be compatible with certain lobes. I had to switch to 1.7's when I went with the VRX5 cam and had to take a little loss on them. But I loved my Harland Sharps! Never had a problem.

Hope that helps

[ipimpthisc]

guys forgive me for the ignorance..i am lost ...what exactly do the rockers do...how far can i go with such rockers on my stock cam...and what will be the power difference...will power be across the power band or just in a select rpm, and will it be compatible with fi...sine i am def going to go that route in the near future

[Clint@A.I.R.]

Also I would not trust the stock springs with that much lift. so your talking the expense of changing the springs too. IMO minimal gains VS cost involved.

Clint

[Heliwrench]

Cam.

[Topdown]

rockers are what push open the intake and exhaust valves based on the cam lobes. as the cam turns, the lobes get taller and shorter, as they get taller and shorter, the rockers pivot on a roller-bearing fulcrum and that upward motion is turned into downward motion, that downward motion pushes the corresponding valve open and hold it there until the cam lobe turns enough to go back down.

The benefit of higher ratio rollers is that you can make a mild cam "bigger" and more aggressive without having to take the engine apart. The drawback is that if there isnt enough room in the combustion chamber, the valves will hit the pistons and then its just a matter of revolutions before catastrophe.

I have read that there is limited room on the L99/LS3 and that GM is already using a 1.7 ratio rocker. There should be enough room for a 1.8 (or apparently a 1.85) but I dont know enough data to be able to speak to what kind of gains your going to see or if the 1.8's work with the L99 AND the LS3 or just one vs the other.

I am curious to see some data as well. engine, power before, power after, ratio size, etc...

[ipimpthisc]

thanks for the replies guys..i think that i might just stay with the stock ..and run the FI option..i will have more then enuff power for what i want

[litle88]

If you go FI I would change pushrods and Springs anyways! they are just Ls6 springs and a nice set of let say patriot golds will give you better seat pressure open and closed. when your doing a FI install the Springs and rockers will be 4 bolts away per side. The rockers should either get a trunion upgrade which is like 130 bux thru Texas Speed or a nice set of after market RR's like Harland Sharps!
If your going FI dont skip out some mods that you can upgrade since your there. Thats just my .02

Also the lift with a 1.8 RR install will need a spring upgrade,thats for sure. And it will have plenty of clearance in the CC. The L99 cars have valve reliefs in the pistons so that gives them a little more clearance, how many more CC's Im not sure but thats why their CR is 10.4 if im not mistaken.

[ipimpthisc]

Originally Posted by litle88

If you go FI I would change pushrods and Springs anyways! they are just Ls6 springs and a nice set of let say patriot golds will give you better seat pressure open and closed. when your doing a FI install the Springs and rockers will be 4 bolts away per side. The rockers should either get a trunion upgrade which is like 130 bux thru Texas Speed or a nice set of after market RR's like Harland Sharps!
If your going FI dont skip out some mods that you can upgrade since your there. Thats just my .02

Also the lift with a 1.8 RR install will need a spring upgrade,thats for sure. And it will have plenty of clearance in the CC. The L99 cars have valve reliefs in the pistons so that gives them a little more clearance, how many more CC's Im not sure but thats why their CR is 10.4 if im not mistaken.

agaian thanx for the guidance...i will def look into this,,,but this mite have to wait, based on my tite budget for now

[Bell040]

Did anyone ever do just a rocker upgrade (1.8 or 1.85) instead of a cam?

or both?

I am curious at the gains from just rockers... or if I should try 1.8 rockers the next time I replace springs.


EDIT: not sure why this thread is in the FI section.

[SC2150]

1.8's can be used with yellow (LS3 springs) but NOT with the L99 springs.

litle88 shows the correct formula as well. they will increse the lift but the duration will remain the same. Gains are real....not the same as a cam, but they can be a affordable alternative for a small gain.

[jay@redline-motorsports]

one thing to remember is with more ratio on the rocker the harder you work the lifter

[old motorhead]

Adding 1.8 ratio rockers will yield more hp. The increase will be so miniscule than no "butt dyno" will be able to detect it though. Save your money for a cam and related valve train upgrades. Orrrrrrrr, maybe buy some glass tint....curb feelers....etc

[ZL600 FK]

Based on SLP ZL packages - rocker arms gives you about 15 hp (1.85 ratio).