NitroStick Series Valve Springs are revolutionizing MINIs performance with street/strip applications. The NitroStick Series Valve Spring and Retainer kit is the first and only valve spring kit designed specifically for the Tritec Mini Cooper engine. Titanium retainers reduce inertial load, allowing optimal performance for high RPM and high lift camshaft applications. The NitroStick Spring and Retainer kit is for street and track applications and is the best choice possible for your MINI. The unique Beehive design allows the valve train to handle higher engine rpm and more aggressive cam profiles with even a full race MINI engine but still retain reliability for street driving.
Features |
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Downloads & Documentation |
FAQs
Features
Bee Hive Geometery
The Bee Hive Geometery has several benefits: Beehive valve springs have been known in the industry as having a lower mass at the retainer end thus allowing for better valve control. Beehive valve springs are unique when it comes to coil spacing and rate control,
Oval Wire
Unlike many conventional springs, the NitroStick valve spring is wound with oval wire. This results in more even stress distribution in the spring, and allows for a higher maximum lift.
Ti Retainers
The Ti retainers are custom manufactured for the Tritec MINI application. Ti is a lighter mass material than steel, reducing inertail effects and valvetrane loading.
Specifications
1.061" Outside Diameter
0.550" Max Lift
1.020" Coil Bind
37.3 g Spring Weight
110 lbs @ 1.650" Seat Force
Image Gallery
Downloads & Documentation
Frequently Asked Questions
I already have upgraded springs that came with my Performance Head why would I need this spring kit?
Up untill now, no one had made a good valve spring for the Tritec Mini. So, most heads are supplied with either stock springs, or springs that have to be shimmed (compressed) to bring up the seat pressure to a servicable level. Check your dyno graph. Oftentime the roughness in the HP curve above 6000 RPM is due to valve float. These springs will control valve motion to much higher RPM.
Can I install them without having to remove my head from the engine?
Yes! All it takes is two inexpensive tools that allow you to pressurize the cylinder head and then compress the valve spring. The tools are available from many places, including the misc stuff page on the Dr Obnxs blog. The job takes part of an afternoon, with time left over to enjoy a couple of beers!
How much lift can I run with the NitroStick valve springs?
The NitroStick Spring and Retainer kit for the MINI is the only kit rated for camshafts with lifts exceeding 0.500". The springs will deliver high RPM benefit with any camshaft currently offered for the Tritec MINI.
