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2.0L 16v - SR20DE/DET
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2.0L 16v - SR20DE/DET
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Set of 8 reinforced inlet valves for the NISSAN Pulsar GTI-R (RNN14) with the SR20DET engine.
The Pulsar GTI-R RNN14 gets its own version of the SR20DET, Nissan's 2.0 litre 16-valve four-cylinder with twin overhead camshafts and a turbo, fitted to this four-wheel-drive compact.
The engine has 8 inlet valves, two per cylinder. Raised boost, sharper camshafts or a higher rev limit load them well beyond stock use.
On a tuned turbo four-cylinder, each inlet valve opens dozens of times per second, then strikes its seat and slides in its guide under boost pressure. It runs between 400 and 550 °C, where the original chrome-silicon steel falls from 500 MPa at 500 °C to 250 MPa at 600 °C: 50 % of its strength is gone.
SUPERTECH makes these valves from a racing stainless steel of the EV8 family, which keeps 650 MPa at 500 °C and 550 MPa at 600 °C, 30 % and then 120 % more than the original steel. Black nitriding makes the stem harder and smoother, so it wears less in the guide.
SUPERTECH supplies it in +1 mm oversize: 35.15 mm head, 5.97 mm stem and 102.10 mm length. The wider head opens a larger passage at the seat: the cylinder fills better and the engine gains power, with the inlet seats cut to the new size.
| Part number | Brand | Size | Head Ø | Stem Ø | Length | Grooves | Material |
|---|---|---|---|---|---|---|---|
| NIVN-1007-GTIR-8 | SUPERTECH | +1 mm | 35.15 mm | 5.97 mm | 102.10 mm | Black nitride stainless steel |
| Part | NISSAN original | Reinforced |
|---|---|---|
| Collets | ||
| Valve stem seals | ||
| Valve guide |
The +1 mm size requires the inlet seats to be cut to 35.15 mm, workshop work to plan with the cylinder head rebuild.
 | SUPERTECH works out of San Jose, California, and has supplied valvetrain parts for racing engines for more than 30 years: valves, springs, retainers and guides. Each part number starts from a specific cylinder head, goes through ultrasound, X-ray and laser checks, then is proven with engine builders, from drag strip to circuit. |
| Model | Engine code | Power | Years |
|---|---|---|---|
| Pulsar GTI-R (RNN14) | SR20DET |
For a rebuilt Pulsar GTI-R SR20DET cylinder head, the reinforced exhaust valves are available here:
| NISSAN Pulsar GTI-R SR20DET exhaust valves → |
