Reinforced valve spring kit Nissan KA24DE

€825.47 (tax incl.)

Reinforced double valve spring kits for the Nissan KA24DE 2.4 16V engine.

Brand: SUPERTECH
Engines: KA24DE (240SX, Altima, Navara D22)
Springs: double
Contents: springs, titanium upper retainers, lower spring seats

Nissan engines covered

These kits target the KA24DE, the 2.4 litre twin-cam 16-valve four-cylinder of the 240SX, Altima, Navara D22 and several Japanese saloons and people carriers of the 1990s and 2000s.

From the factory, each valve carries a 13203-53F00 spring (then 13203-9E000 and 13203-0Z800 depending on the year), topped by an upper retainer 13209-53F00 or 13209-9E000 and seated on the lower spring seat 13205-40F00. The split collets 13210-40F00, then 13210-D4200, lock the whole stack.

SUPERTECH reinforced valve spring kit

Each valve opening compresses the spring, which then has to bring the stem back against the cam without delay. When the engine climbs in revs, a stock spring can let go: the valve bounces, lands late or touches the piston.

The three kits state 427 N (H1000D), 374 N (H100DR) and 325 N (H1002D) on the seat for an installed height of 34.85 mm.

Valve spring kit technical specification

Part number	Brand	Springs	Outer / inner Ø	Seat pressure	Open pressure	Max lift	Kit contents
SPRK-H1000D-240	SUPERTECH	Double	Ext. 29.7 / 21.9 mm Int. 20.5 / 15.5 mm	427 N at 34.85 mm	1068 N at 11.8 mm	14.0 mm	Springs, titanium upper retainers, lower spring seats
SPRK-H1002D-240	SUPERTECH	Double	Ext. 29.1 / 21.9 mm Int. 20.5 / 15.5 mm	325 N at 34.85 mm	1001 N at 11.8 mm	15.3 mm	Springs, titanium upper retainers, lower spring seats
SPRK-H100DR-240	SUPERTECH	Double		374 N at 34.85 mm			Springs, titanium upper retainers, lower spring seats

Valve spring kit fitting details

Part	Nissan original	Reinforced spring kit
Spring	13203-53F00, 13203-9E000, 13203-0Z800	Kit specific (double)
Retainer	13209-53F00, 13209-9E000	Kit specific (titanium)
Spring seat	13205-40F00	Kit specific
Collets	13210-40F00, 13210-D4200	Original kept

Each SUPERTECH kit brings double springs, titanium upper retainers and lower spring seats; the factory collets stay in place.

Installed height is the distance, valve closed, from the foot of the spring sitting on the lower spring seat to the upper retainer that caps it. All three kits are rated at 34.85 mm: 427 N for the H1000D, 374 N for the H100DR, 325 N for the H1002D. A recut seat or a planed head lengthens it and takes load away, more so with a stiff spring; the reference figure follows.

	SUPERTECH
Installed height	34.85 mm
Seat pressure at this height	427 / 374 / 325 N

Technical guide

Our brands

SUPERTECH is a Californian maker of competition valvetrain parts, active in California for over thirty years. Its springs are wound with care from alloyed steel, then every production series goes through ultrasound, radiography and a laser scan before it ships.

How to choose

With stiffer springs the valve follows the cam profile much higher up the rev range. The KA24DE can then take a more aggressive camshaft, a turbo or a raised ignition cut without the valvetrain running away. All three kits are rated for one installed height, 34.85 mm; the maximum net lift is 14.0 mm for the H1000D and 15.3 mm for the H1002D, figures that camshaft lift must not exceed. A welcome safety margin on track or in drift.

Criterion	Key point
Choosing the pressure	The 96, 84 and 73 lbs designate seat load: 427 N for the H1000D, 374 N for the H100DR, 325 N for the H1002D. Compare the lift of your cam, the revs you are chasing and any turbo. A very generous cam points to the H1002D and its 15.3 mm of lift; an engine pushed for revs points to the firmer H1000D. More load than needed gains nothing and tires the cams.
Single or double spring	Two springs of different diameters, one nested inside the other, sit on each valve: they share the effort and restrain each other when they vibrate. It is the answer to holding up at high revs, where the single stock spring ends up tiring. Retainers in titanium and lower seats complete the kit.

When reinforced springs become necessary

Camshaft whose lift exceeds the original
Maximum revs far above normal
Turbocharger or supercharger fitted, or boost raised
Head reworked for track, drift or rally use
Tired springs or valves bouncing at high revs

Compatible vehicles

Model	Engine code	Power	Years
200SX (S13) 2.4	KA24DE	158 hp	1990-1993
240SX 2.4	KA24DE	150-158 hp	1988-2001
Altima (L30) 2.4	KA24DE	152 hp	1997-2001
Altra (N30) 2.4	KA24DE	155 hp	1997-2001
Bassara (JU30) 2.4	KA24DE	150 hp	1999-2003
Bluebird (U13, U14) 2.4 i	KA24DE	152 hp	1992-1997
Gloria XI (Y34) 2.4	KA24DE	152 hp	1999-2004
Largo (W30) 2.4 i	KA24DE	116-146 hp	1993-1999
Leopard (Y33) 2.4	KA24DE	152 hp	1995-2001
Navara (D22) 2.4	KA24DE	143-150 hp	1997-
Navara NP300 (D40) 2.4	KA24DE	146-150 hp	2004-
NP300 Pickup (D22) 2.4	KA24DE	143 hp	2008-
Paladin (WD22) 2.4	KA24DE	148 hp	2003-2018
Pick Up (D22) 2.4	KA24DE	126-150 hp	1997-
Presage (U30) 2.4	KA24DE	150 hp	1998-2002
R'nessa (N30) 2.4	KA24DE	155 hp	1997-2001
Xterra (WD22) 2.4	KA24DE	143-146 hp	1999-2004