Rocker retainers

[AWD-Tony]

Just saw this in my YT feed. Anyone try or know about these?

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[DSMTunedKvMan]

Interesting part.

 

[bastarddsm]

Those guys are morons. Those are bad bad bad. The rocker is captive unless the valvetrain is way out of control. That means valve float. The valve relies on the cam gently opening and closing the valve. If you have excessive clearance (float), these early soft ramps are missed and the valve is slammed open, and slams shut usually bouncing. Eventually the valve breaks and ruins everything. Valve float is when the spring can't overcome the acceleration of the valve, and the valve isn't held tight to the rocker/cam, and it's motion is not controlled by the cam.

If your engine tosses a rocker it's telling you to fix it before it has a really really bad problem. These just let you ignore it.

Fun fact there are forms of racing where the engines are limited to a certain ammount of lift. The fast guys cleverly figured out that you can use "float" to your advantage, and basically throw the valve open over the nose, and make sure you catch it with the cam before the closing ramp. It's really really hard on stuff, and takes cubic dollars worth of time on a spintron to get right so it doesn't destroy everything.

 

[AWD-Tony]

Lol. I have no ideas who they are but thought it was a good idea. Out of the 5 years I’ve been back into dsm’s, I’ve only seen rockers come loose twice. Once on here and the other on Adam LZ’s evo V. No damage in either case. I haven’t personally experienced valve float ever but I only rev to 8k since installing springs and retainers. Would a collapsed lifter ever cause float or the rocker to come loose? Someone told me I could rev to 8k on a stock head. Your thoughts @bastarddsm

 

[lanselotpower]

they have problem with newer stile rocker , like you said for evo , they are little bit different, and these clips fit only for them. thats why always get the old stile rockers

 

[bastarddsm]

Yes, if you have a collapsed lifter that will treat the valve like floating it, and it could spit the rocker out. My guess it the valvetrain does not need to be as badly out of shape to toss an evo rocker. This is usually only a problem with big big cams. Like the big Kelford 294's and the old FP5/11R ect..

As for 8k on stock stuff, that depends a lot on the cam profile. For most of the old school stuff yeah, it's ok to do that if your stock head is in good shape. The basic springs that manley/bc/crower/ect sell are just about the same seat pressure and rate as new stock ones. On smaller cams you will actually have problems with boost/exhaust pressure holding valves open before RPM.

I ran delta HKS272 regrind copies on stock springs to 8500 all the time back in the day. No problems at all.