Reinforced inlet valves RENAULT Clio 2 Clio 3 RS F4R

RENAULT engines covered

The F4R is Renault's 2-litre 16-valve four-cylinder. In Renault Sport form it powers the Clio 2 RS (F4R 730, 736 then 738, 169 to 179 hp) and the Clio 3 RS (F4R 830 and 832, 197 to 200 hp). The Mégane 2 RS (F4R 774, 2004 to 2009) and the Clio 3 2.0 16V with the M4R engine (2006 to 2014) are also among the applications.

It has 8 inlet valves, originally 13201-00QAE (7701 474 287), with a 33.4 to 33.6 mm head, a 5.5 mm stem and an overall length of 110 mm. A sharper camshaft, a higher rev limit or forced induction load them more every time they open.

SUPERTECH and CATCAMS reinforced inlet valves

An inlet valve opens the way for the fresh charge, settles back onto its seat every cycle and slides constantly in its guide, at 400 to 550 °C. A standard chrome-silicon steel then falls from 500 MPa at 500 °C to 250 MPa at 600 °C, a 50 % loss of strength.

The SUPERTECH valve receives a black nitride treatment that hardens the surface and limits stem wear in the guide; its head is dished. The CATCAMS valve follows the original F4R dimensions.

The +1.5 mm SUPERTECH valve takes the head from 33.5 to 35 mm with the same stem and length: air flows past the seat more freely, the cylinder fills better and the engine gains power, once the 8 inlet seats are machined.

Inlet valve technical specification

RIVN-28337-2 and 9255001M are standard size, RIVN-28337-4 is +1.5 mm.

Fitting details

The SUPERTECH RIVN-28337-2 is fitted with the original single groove collets.

With a 33.5 mm head the inlet seats keep their factory size; with 35 mm the workshop machines all 8 seats.

Technical guide

The brands offered

	For more than thirty years, SUPERTECH Performance has designed valves, springs and guides for competition engines in California, checked by ultrasound, X-ray and laser before they reach the engine builders.
	A European specialist in racing camshafts, CATCAMS also offers the valves, springs and retainers matched to its profiles, for tuned road engines as well as rally and track.

How to choose

The groove is the recess at the end of the stem in which the collets hold the upper retainer. On the F4R the choice comes down to size:

When reinforced valves become necessary

• Higher-lift camshafts or stiffer springs
• Higher rev limit
• Turbo or supercharger kit
• Cylinder head rebuilt for track, hillclimb or rally
• Worn original valves or seats already reground

Compatible vehicles

OEM part number (inlet valve): 13201-00QAE (7701 474 287, 7701471279)

Related products

With the cylinder head off, replace the 8 exhaust valves of the F4R as well.