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JRZ Suspension Engineering is proud to offer our newest triple adjustable racing damper. the JRZ 12 31. Building upon the years of success of our original triple adjustable damper. the JRZ 12 31 takes our damping philosophy to the next level. Every adjustment has an increased damping force range with finer adjustments engineered to enable the chassis tuner to make significant predictable changes every time. Compression adjustments are separated into the high speed and low speed piston velocity ranges affecting the bleed and blow off points of the damping curve. All oil flow paths in the JRZ 12 31 have been redesigned to maximize efficiency and give crisp feel to the driver. Rebound valving has been completely redesigned to eliminate influence over compression forces and smooth pressure development. At the heart of the new JRZ 12 31 package is our latest motorsport piston. designed to give increased control over base characteristics. reduce hysteresis. and operate smoother. To ensure that the valving designed into the JRZ 12 31 are the determining forces. JRZ has included new low friction coatings. seals and bearings with this package. Custom applications are available. An easy to use system. the JRZ 12 31 enables the chassis tuner to achieve the desired mass control and handling with precision. Digressive high speed compression blow off adjustment allows for a stiff compression valving while maintaining smooth response and without losing traction. The low speed adjustment is a powerful tool that enables the chassis tuner to maximize grip and optimize vehicle balance. The result is a damper that provides ultimate chassis and ride height control with maximum mechanical traction. The JRZ standard large 22 mm piston rod works in concert with the high speed valving to maximize blow off valve response. achieving solid chassis control without using a high spring rate.

Features

• Rebound adjustment independent from compression
• Extra large adjustment range
• 12 clicks low speed compression
• 21 clicks high speed compression
• 24 rebound • High response piston
• Precise canister
• Low friction
• Adjustable gas pressure

JRZ 12 31 dampers are shipped with 360 degree swivel hoses and are available with zero-inclusion quick disconnects for mounting canisters within the chassis for ease of adjustment accessibility. Our newest motorsport piston has been developed to deliver a smooth and responsive damping characteristic.  To customize track to track setups and tailor the chassis to the driver; the JRZ 12 31 has an adjustment range able to provide damping to spring configurations ranging from 1.5-6Hz on vehicles with moderate to large aerodynamic loads. Even with a large range. each adjustment is designed to be small. even steps giving precision and confidence when making changes. The JRZ 12 31 is here to take you to the next level. Dedicated racing cars with experienced drivers deserve the professional technology JRZ delivers. With valving designed and innovated by JRZ Suspension Engineering. the JRZ 12 31 is shipped as a custom configuration always tailored to the customer’s needs. and always comes with our world renowned personal service.

Benefits

• Precise control of the chassis and unsprung masses
• Easy to change damping curves
• Large adjustment range. with fine tuning ability

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For over 40 years; Cosworth's been leader in innovative multi valve cylinder head design both racing high performance production cars. Cosworth Ported Valve Cylinder head range is latest advancement. Modified from OE cylinder head castings; substantial flow improvements upgraded valve train components offer superior performance your high performance engine.
Each original cylinder head design is carefully evaluated tested to establish improvements required to meet target performance level. Hours of testing flow bench validation used to determine best advanced port design yielding maximum usable power response. However; there is more to cylinder head design than just maximum flow. It is critical that port velocits maintained to ensure drivability valve train components matched to guarantee reliable performance. Once of these factors have been tested validated; final port contour is digitized. Using digitized program; we then reshape both intake exhaust ports using axis mill producing an accurate consistent port shape every time. In addition to reshaping enlarging intake exhaust ports; most Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud valves increasing flow performance. After machining; each cylinder head receives a multiangle high performance valve on precision valve seat cutter. Then each cylinder head is ultrasonically; cleaned; serialized then hand assembled with select high performance valve train components; ready to install on your engine.
Key Features
All OE Castings
Enlarged Intake Exhaust ports
Large diameter stainless steel intake valves
Large diameter Inconel exhaust valves
Hi Rev; Dual valve springs
Titanium Retainers
Hardened Steel spring platforms
Reshaped combustion chamber on most applications
Flow bench proven design
Dyno tested
Machined Cosworth Logo
Precision Multi angle valve job
Pre-assembled; ready to install
Machined port bore finish
Knife edge port divider Learn More