SME Cylinder head for Evo 4-9
Co-developed in cooperation with Swedish SME & Associates the result is a revolutionary new head that has opened up hidden potential in the 4G63 & 4G64 platforms.
Developed from the ground up to solve all the issues with original head the new design has been tested and proven to add efficiency throughout the rev range (See attached graphs)
Suitable for all applications including, Rally, Circuit, & Drag Racing - large Increased in mid range and top end will be achieved.
FAQ's
1. Which Evo models is the new cylinder head compatible with?
• 4-8 Also compatible Evo 9 MIVEC Delete
2. Is it plug & play fitment with standard head gasket?
• Yes
3. Do any other modifications need to be made the the engine or exhaust system?
• The inlet & exhaust studs are 6.0mm higher up however no mods normally needed to ancillary parts
4. What is the material spec & casting method used to manufacture it?
• Lost Wax Casting process. Proprietary grade alloy
5. What is the cylinder head port design based on?
• Port design is based on proven motorsport designs to achieve perfect balance intake & exhaust
6. Is the combustion chamber OEM dimensions?
• Optimised OEM design
7. What is the combustion chamber volume?
• 44.00cc
8. What cam profiles are available?
• 264 Degree - 235@1.27mm 10.8mm Lift
• 272 Degree - 238@1.27mm 11.00mm Lift
• 287 Degree 248@1.27mm 12.00mm Lift
• Base Circle 31mm
9. Can you produce custom cam profiles. If so what information is needed?
• Custom Cams can be made to sure from a hydraulic sample or drawing - £400 Net extra
10. What are the key design features of the head compared to the OEM?
• Direct action cams on buckets shims
• Optimised valved angle
• Reinforced base 150% more material thickness between cylinders 2 & 3
• 20mm think base
• Optimised Motorsport derived port design
• Double cooling capacity of OEM head
• Proprietary Material spec
• Porting capacity is huge up to 3mm everywhere, leaving 2mm wall thickness is possible
• EGR Channel deleted
• Less oil spray in the head means more volume remains in the sump
• 35mm Intake & 31mm exhaust valves Inconel
• Stock springs - Single 32 newtons seat pressure and install height. 76newtons @13mm
• Max lift 13mm
• 16mm coil bind
• 5.50mm stem thickness (OEM 6.60mm)
11. Is it supplied built & ready to install?
• Yes
12. Are spare parts available to service it?
• Yes all spare parts & service is available.