roller rockers
10-04-2008, 08:27 AM
#1
5th Gear Member
Thread Starter
Join Date: Oct 2007
Location: Georgia
Posts: 2,624
roller rockers
what would they do for my car. I have ported and polished E7's, E-303, and performer Edelbrock intake. I'm thinkin of goin with 1.6 rollers from crane but don't no if it would be worth it to go with them or just stay with my stock rockers. I've heard they could add up to 30 horses from stock
10-04-2008, 10:05 PM
#3
M.A.D. Motorsports
Join Date: Jul 2006
Location: Indiana
Posts: 8,014
https://mustangforums.com/forum/5-0l-general-discussion/393439-bolt-on-myths-destroyed.html
If you look at the first test it is with stock vs 1.7's and the car didn't gain much hp as a peak but it was higher through out the range. They will allow the motor to rev up/down smoother and a little quicker. Stock rockers flex and are not exactly 1.6 all the way around. Some are a little bigger and some are a little smaller do to the flexing.
I would get a set of 1.6 RR if I had the cash to do so.
If you look at the first test it is with stock vs 1.7's and the car didn't gain much hp as a peak but it was higher through out the range. They will allow the motor to rev up/down smoother and a little quicker. Stock rockers flex and are not exactly 1.6 all the way around. Some are a little bigger and some are a little smaller do to the flexing.
I would get a set of 1.6 RR if I had the cash to do so.
10-04-2008, 10:08 PM
#4
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
free's up stress on your valve train in a stock application. not much of an HP gain...more of an over feel for the car. it should rev a little better and stay more consistant in the upper RPMS.
personally i'd save your money and get some better heads.
personally i'd save your money and get some better heads.
10-05-2008, 12:07 AM
#6
3rd Gear Member
Join Date: Apr 2008
Location:
Posts: 939
Generally speaking, RR's provide a benifit when valve lift gets to about .500". After that, the side loads from the sliding rocker tip deflect the valve stem and wear the guide. Below about .500", there's no benifit at all. The E303 cam has .498" of valve lift. So you're right on the edge there.
Stock 5.0's can generally pick up a little power by adding 1.7 rockers, like from a Cobra engine. That will give you more valve lift and a couple more degrees of duration. On some engines that's noticable. And on some it's not.
But you already have an aftermarket cam with additional valve lift. Increasing valve lift without claying the pistons is probably not a good idea. If you clayed them with the new cam, and you're sure about how much clearance you have, you might want to risk it. Then again, you might not.
Stock 5.0's can generally pick up a little power by adding 1.7 rockers, like from a Cobra engine. That will give you more valve lift and a couple more degrees of duration. On some engines that's noticable. And on some it's not.
But you already have an aftermarket cam with additional valve lift. Increasing valve lift without claying the pistons is probably not a good idea. If you clayed them with the new cam, and you're sure about how much clearance you have, you might want to risk it. Then again, you might not.
10-05-2008, 10:35 AM
#9
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
10-05-2008, 07:33 PM
#10
5th Gear Member
Thread Starter
Join Date: Oct 2007
Location: Georgia
Posts: 2,624
