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Ultra-High RPM Dual Valve Spring / Titanium Retainer Set

 
Old Dec 11, 2009, 12:31 AM
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Originally Posted by reactionevo8 View Post
you must use the supertech valves seals which are smaller in diameter otherwise you run the risk of the springs rubbing on the oem seals...not a big deal really since you have to replace the seals anyway when going their dual valve springs
what he said
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Old Dec 16, 2009, 09:04 PM
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Anyone out there running this?
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Old Dec 16, 2009, 09:16 PM
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Originally Posted by tien View Post
Anyone out there running this?
why dont you stick with whats proven to work? no sense in gambling on something that may or may not work for your needs
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Old Dec 16, 2009, 10:08 PM
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A valve spring cannot be tagged with a specific rpm limit, except with a particular cam set, valvetrain, etc. A spring that will effectively track an HKS cam (lazy ramps) up to an 8000rpm limit will not handle a cam with a more aggressive lobe profile (e.g. GSC S2) at that same rpm using the same valvetrain.

The backside of a valve is important to the overall flow potential of the port. This is one area where OEM valves typically fall short of better quality aftermarket parts.

We measured a typical factory EVO spring at around 50 lbs seat pressure and 150 lbs open pressure. That isn't enough to accurately track better cam sets where they are intended to make power.

Valve float causes erratic valve action that compromises power. On the intake side, the valve floats to a point whereby the piston is moving far enough upward bast BDC whereby it begins pushing the intake charge right back through the intake valve. On the exhaust side, the excess overlap begins to contaminate te intake charge. In many cases, the reduction in power may not be readily apparent, but it is there. When the effect is enough to be easily recognized on the dyno or is audibly evident, the problem is especially serious.

It is always better to have a little more valve spring pressure than one really needs than a little less. There are quite a few persons in this forum who are experiencing reduced power due to inadequate spring pressures. They just don't realize it.
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Old Mar 9, 2010, 07:01 PM
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Originally Posted by Ted B View Post
A valve spring cannot be tagged with a specific rpm limit, except with a particular cam set, valvetrain, etc. A spring that will effectively track an HKS cam (lazy ramps) up to an 8000rpm limit will not handle a cam with a more aggressive lobe profile (e.g. GSC S2) at that same rpm using the same valvetrain.

The backside of a valve is important to the overall flow potential of the port. This is one area where OEM valves typically fall short of better quality aftermarket parts.

We measured a typical factory EVO spring at around 50 lbs seat pressure and 150 lbs open pressure. That isn't enough to accurately track better cam sets where they are intended to make power.

Valve float causes erratic valve action that compromises power. On the intake side, the valve floats to a point whereby the piston is moving far enough upward bast BDC whereby it begins pushing the intake charge right back through the intake valve. On the exhaust side, the excess overlap begins to contaminate te intake charge. In many cases, the reduction in power may not be readily apparent, but it is there. When the effect is enough to be easily recognized on the dyno or is audibly evident, the problem is especially serious.

It is always better to have a little more valve spring pressure than one really needs than a little less. There are quite a few persons in this forum who are experiencing reduced power due to inadequate spring pressures. They just don't realize it.
This just solved my spring dilemma, thanks!

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Old Sep 6, 2016, 01:43 AM
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Cosworth

Im running on cosworth. I havent had any issues what so ever.

Originally Posted by brokenRS View Post
Anyone running this set? Comments and info?

I am planning to purchase one, just trying to see what people think or thought of it.
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Old Sep 10, 2016, 07:16 AM
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Thanks for bumping a 6year old thread to let us know
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