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Reinforced valve spring kits Opel Vauxhall C20XE C20LET

Reinforced valve spring kit Opel Vauxhall C20XE C20LET

€514.37 (tax incl.)

Kits of 16 reinforced valve springs for the 2.0 litre Opel and Vauxhall C20XE and C20LET engines.

Brand: SUPERTECH
Engines: C20XE, C20LET
Springs: double
Contents: springs, spring seats, retainers depending on the kit

Opel and Vauxhall engines covered

These kits suit the C20XE, the naturally aspirated 2.0 litre four-cylinder with 16 valves, and, for the second one, its turbocharged sibling, the C20LET; they go into the Opel Astra F GSI, Calibra, Kadett E GSI and Vectra A, and the Vauxhall Astra Mk III, Calibra and Cavalier Mk III. Valve stems measure 7 mm on both the inlet and exhaust sides.

As original equipment, each valve is closed by a spring numbered 90322032 or 90448050. An upper retainer (90322031) and collets (90097110) hold it in place.

SUPERTECH reinforced valve spring kit

As soon as the lobe moves away, the spring pulls the valve back onto its seat. At high revs it can no longer cope: the valve floats, lands late and may hit the piston.

Here each kit brings 16 double springs: 311 N at the seat and 14.5 mm maximum lift for SPRK-H1002-C20, 356 N and 13.9 mm for SPRK-TS1012-C20.

Valve spring kit technical specification

Part number	Brand	Springs	Outer / inner Ø	Seat pressure	Open pressure	Rate	Max lift	Kit contents
SPRK-H1002-C20	SUPERTECH	Double	Outer 29.1 / 21.9 mm Inner 20.5 / 15.5 mm	311 N at 34.0 mm	787 N at 10 mm	44.5 N/mm	14.5 mm	16 springs, 16 titanium retainers, 16 spring seats
SPRK-TS1012-C20	SUPERTECH	Double		356 N at 33.5 mm	837 N at 10 mm		13.9 mm	16 springs, 16 spring seats (original upper retainers kept)

Valve spring kit fitting details

Part	Opel and Vauxhall original	Reinforced spring kit
Spring	90322032; 90448050	Kit specific: SPR-H1002D (double); SPR-TS1012 (double)
Retainer	90322031	Kit specific: RET-H70/T1, titanium; original kept with SPRK-TS1012-C20
Spring seat		Kit specific: SEAT-H1020DS; SEAT-TS15/LS-IN
Collets	90097110	Original kept

The SUPERTECH kit SPRK-H1002-C20 supplies 16 SPR-H1002D double springs, 16 RET-H70/T1 titanium retainers and 16 SEAT-H1020DS spring seats; kit SPRK-TS1012-C20 supplies 16 SPR-TS1012 double springs and 16 SEAT-TS15/LS-IN spring seats. The original collets stay in place.

Measured valve closed, the installed height runs from the bottom of the lower spring seat to the upper retainer. The SUPERTECH figure applies to that single height only; should the assembly grow, after heavy seat resurfacing for example, the load falls by the spring rate for each added millimetre (see the figures in the table below).

	SUPERTECH
Installed height	34.0 mm / 33.5 mm
Seat pressure at this height	311 N / 356 N

Technical guide

Our brands

Based in San Jose, California, SUPERTECH has spent more than thirty years on valvetrain parts for racing engines. Springs come from chrome silicon vanadium steel, retainers from military-grade titanium, and every batch is examined acoustically, radiographically and by laser before shipping.

How to choose

With firmer springs the engine can rev higher, accept a more aggressive cam profile or run boost without valve float. These kits deliver 311 N and 356 N at the seat, 787 N and 837 N at 10 mm lift. Make sure the intended camshaft lifts no more than the 14.5 mm or 13.9 mm each kit accepts. These figures describe the kit as supplied, fitted at the height given above.

Criterion

Key point

Choosing the pressure

To judge the load, set your camshaft lift beside the revs you are targeting: the more both climb, the firmer the spring must be. These kits give 311 N (70 lbs) and 356 N (80 lbs) on the seat. Keep a sense of proportion though: an overly hard spring wears cams and valvetrain early. Treat this figure as a starting point and check that camshaft lift never goes beyond 14.5 mm (13.9 mm for the second kit). The first kit's rate is 44.5 N/mm: the load climbs by that amount for each extra millimetre of lift.

Single or double spring

Two nested coils work together here: they add up their force in a small volume and damp spring vibration. A single spring has only one coil. Each kit supplies this set-up for all 16 valves; the original collets are reused.

When reinforced springs become necessary

Camshaft lifting more than the original
Rev ceiling raised well above stock
Engine converted to turbo or supercharger
Cylinder head rebuilt for track, drift or rally
Worn springs, valves floating at high revs

Compatible vehicles

Model	Engine code	Years
Opel Astra F GSI 2.0 i 16V	C20XE	1991-1998
Opel Calibra A 2.0 i 16V	C20XE	1990-1994
Opel Kadett E GSI 2.0 16V	C20XE	1988-1993
Opel Vectra A 2.0 i 16V	C20XE	1989-1995
Vauxhall Astra Mk III	C20XE	1991-1998
Vauxhall Calibra	C20XE	1990-1994
Vauxhall Cavalier Mk III	C20XE	1988-1995
Opel Calibra A 2.0 i Turbo 4x4	C20LET	1990-1997
Opel Vectra A 2.0 i Turbo 4x4	C20LET	1989-1995
Vauxhall Calibra 2.0 i Turbo 4x4	C20LET	1990-1997
Vauxhall Cavalier Mk III 2.0 i Turbo 4x4	C20LET	1988-1995