Supertech Dual Valve Springs

[rst95eclipse]

I've heard through the grapevine that Supertech dual valve springs have been tested and a video has shown that they are causing troubling problems high during high rpms. Supposedly, they are "heavy" and the spring stays compressed as the lobe heads up. This separates the retainer from the rocker for a moment. Once the retainer meets the rocker, the valve smacks the head. After the valve smacks the head, the valve again opens when it should not - rebounds. Not good.

Anyone have any thoughts or heard/seen this story as well?

 

[Defiant]

How the hell high are they winding them? And a better question, why?

 

[rst95eclipse]

8500rpm is where the test was conducted. I've now seen the video, and it's hideous. All I have to say is look for a beehive design to be coming out in the near future.

 

[Bender]

Hm.. Anyone else heard this? I was looking at either this EXTREME PSI : Your #1 Source for In Stock Performance Parts - Supertech Dual Valve Spring Kit: Mitsubishi Eclipse 90-99 or this EXTREME PSI : Your #1 Source for In Stock Performance Parts - Supertech High Tension Dual Valve Spring Kit: Mitsubishi Eclipse 90-99

 

[JWoodley]

8500rpm is where the test was conducted. I've now seen the video, and it's hideous. All I have to say is look for a beehive design to be coming out in the near future.

Care to share said video?

 

[donniekak]

Was the cam at 8500 rpm's? Or 4250, the speed it will be turning at 8500rpm's of engine speed. Also in for the vid.