Question about full aluminum Rocker Arm Kit

[JAM]

3800 performance web-site part #RAK-290 – 1.90:1 ratio INTENSE full aluminum Rocker Arm Kit for L36/L67 engines with stock cam Kit for L36/L67 engines with stock cam.

Has anyone tried this set up?

1. Will this work with my stock engine?
2. If yes, will this increase the hp? If yes how much?
3. Should a aftermarket cam be used with this set up, is it nessacary?

Not sure if this should be in advanced or not since is fairly general question. Please advise.


;)

[black98V6]

I'd be interested to see what these do on a N/A engine.. 1.9 seems like a bit much in the way of ratio..

I however wouldn't mind a full roller aluminum 1.75 or something like that..

[JAM]

Agreeded! These are supposed to be for NA motors according to the description. They have less agressive ratio's available. Hopefully somone can answer this one, and has tried it.

[bu-bye]

Thats a good question. I think the guys in Advanced Tech can better answer your question. Moving now.... [img]graemlins/toto.gif[/img]

[pgriffith]

They may work, but a cam is alot cheaper. And everyone seems to be convinced you will get more power from the added duration a cam will give than the extra lift from rockers.

[JAM]

I wrote to them and they said that I should expect 12-15hp. I was told via e-mail that you can run a 1.9 ratio with the stock cam, but not with aftermarket.

So an aftermarket cam doesn't lift this high? I just assumed the best combo would be a cam and full rockers. (hence my question about picking cam for daily driver in other thread)

So is it better to use the stock cam and 1.9 ratio?

[pgriffith]

<blockquote>quote:</font><hr>Originally posted by JAM:
I wrote to them and they said that I should expect 12-15hp. I was told via e-mail that you can run a 1.9 ratio with the stock cam, but not with aftermarket.

So an aftermarket cam doesn't lift this high? I just assumed the best combo would be a cam and full rockers. (hence my question about picking cam for daily driver in other thread)

So is it better to use the stock cam and 1.9 ratio?<hr></blockquote>


You will gain more lift than stock with aftermarket cam also. Its just that the lift is in the cam and not the rockers. So if you try to use a high lift cam with 1.9 ratio rockers you might get a valve to touch a piston, coil bind etc...

[JAM]

What if I use the 1.90:1 ratio INTENSE full aluminum Rocker Arm Kit and use only the stock cam?

They e-mailed me back and that is what they sugested to do. Please advise.

[Dominic]

<blockquote>quote:</font><hr>Originally posted by JAM:
What if I use the 1.90:1 ratio INTENSE full aluminum Rocker Arm Kit and use only the stock cam?

They e-mailed me back and that is what they sugested to do. Please advise.<hr></blockquote>

Again, you'll only make like 10hp with it rather than the 30-40rwhp you'd make with a sound cam.

[JAM]

30-40rwhp? Did I read that right? I did not think I could get that much from a cam?? If that is true what cam?? LOL. Send me an e-mail Dominic so that this thread doesn't change subject. JA_Medure@excite.com Back to the rockers....

Here was the response I got from the 3800 web-site:

"1.90 ratio rockers are a good mod. A cam with lower ratio rockers would give you more power, but the install of a cam is expensive (500.00) plus rockers and cams and all gaskets cost more money. When you purchase the rockers, they come with instructions (complete) on how to swap the rockers and how to put the valve covers on properly. Our install shop is in Westerville. Depending on the cam you use, as to the SES light. Rockers will not cause you to have a SES light. No other Modification is needed to install the rockers.

3800Performance"


He did tell me you have to modify the valve covers a bit with a 1.9. Not sure what this means. Does anyone thing that a lower ratio is better? If so why?

[JAM]

Anyone?

[MoreThanAV6]

You are not going to get 30-40 hp with a cam unless you have a L67. The 1.9 roller rockers aren't even the best rockers for the L36. A split ratio set of rockers has been dynoed to prove more hp gains. Don't know if its displayed on the Intense site or ZZP preformance site. A cam will end up costing you more after paying for installation and you should get stronger springs to support the higher lift, but you will get better gains from it. Rockers can be installed easily if you know how to use a wrench and follow directions. I have the 1.9 roller rockers in my car and I love em.

[JAM]

Thanks for the info. That was might thoughts as well...

Cam = new retainers, rockers, springs, pushrods, gasgets, and the labor of taking everything apart.

rockers = less labor + only rockers.

Is this correct?

They have told me via e-mail that you need to modify your valve covers with the 1.9's. How did you have do do that MoreThanAV6? What was involved?

[pgriffith]

<blockquote>quote:</font><hr>Originally posted by JAM:
Thanks for the info. That was might thoughts as well...

Cam = new retainers, rockers, springs, pushrods, gasgets, and the labor of taking everything apart.

rockers = less labor + only rockers.

Is this correct?

They have told me via e-mail that you need to modify your valve covers with the 1.9's. How did you have do do that MoreThanAV6? What was involved?<hr></blockquote>


If you go with the 1.9 ratio you might need new springs. Im not sure if the stock springs can handle that much lift.

[pgriffith]

I take that back. You will be about .490 lift on the intake side and about .486 on the exhaust side. Stock springs should be ok with that lift. This is with 1.9 ratio rockers.