Reinforced Inconel exhaust valves SUPERTECH for RENAULT Megane 3 RS F4R 874

The reinforced exhaust valve kits SUPERTECH for the F4R 874 engine consist of 8 valves.

Technical specification

• Head diameter: 29.00mm (OEM) or 30.00mm (+1mm)
• Stem diameter: 5.97mm
• Length: 108.90mm
• Material: Inconel
• Keeper grooves: 1
• Part numbers: REVI-28338FS-2-6-8, REVI-28338FS-3-6-8
• Please note: not compatible with the OEM collets, fit with SUPERTECH collets:

SUPERTECH valves start life as a forged blank which is then CNC machined for optimal precision. They are heat treated, the process varying with the intended application, then reground in a super-finishing operation. Each valve is checked by ultrasound, X-ray and laser measurement.

For over three decades SUPERTECH has worked to find the most suitable material for each valve and each application in order to increase reliability. Hence the different valve materials: stainless steel, Inconel, titanium and sodium, the latter sitting inside the stem to improve heat dissipation.