Reinforced valve spring kit Honda K24Z7

€937.19 (tax incl.)

Reinforced valve spring kits for the Honda K24Z7 engine.

Brand: SUPERTECH
Engines: K24Z7 (Civic IX 2.4, Acura ILX 2.4)
Springs: double
Contents: springs, upper retainers, lower spring seats, collets

The Honda K24Z7 engine covered

The K24Z7 is Honda's 2.4 litre four-cylinder with twin overhead camshafts, 16 valves and VTEC variable timing. It powers the Honda Civic IX 2.4 and the Acura ILX 2.4.

The kit replaces the original spring along with its upper and lower seats, and adds new collets.

SUPERTECH reinforced valve spring kit

Once the cam has done its work, only the spring puts the valve back on its seat. As revs climb, a valve that has been thrown takes longer to come back down; with too little load it hops, seats late and can hit the piston, hence valve float.

The three kits give 298 N, 356 N and 383 N on the seat, at the heights shown in the tables.

Valve spring kit technical specification

Part number	Brand	Springs	Outer / inner Ø	Seat pressure	Open pressure	Rate	Max lift	Kit contents
SPRK-H1000D-Z7	SUPERTECH	Double 67 lbs	Outer 29.7 / 21.9 mm Inner 20.5 / 15.5 mm	298 N at 36.4 mm	934 N at 12.5 mm	51.2 N/mm	15.7 mm	16 springs, 16 titanium upper retainers, 16 lower spring seats, 32 collets
SPRK-H1005D-Z7	SUPERTECH	Double 80 lbs	Outer 29.7 / 21.9 mm Inner 20.5 / 15.5 mm	356 N at 36.4 mm	979 N at 12.5 mm	51.2 N/mm	15.7 mm	16 springs, 16 titanium upper retainers, 16 lower spring seats, 32 collets
SPRK-H100DR-Z7	SUPERTECH	Double 86 lbs	Outer 30.2 / 22.2 mm Inner 22.2 / 16.8 mm	383 N at 33.4 mm	1041 N at 12.5 mm	55.6 N/mm	14.9 mm	16 springs, 16 titanium upper retainers, 16 lower spring seats with shim, 32 collets

Valve spring kit fitting details

Part	Honda original	Reinforced spring kit
Spring		Kit specific: SPR-H1000D, SPR-H1005D or SPR-H100DR
Retainer		Kit specific: RET-K24Z7/T1 titanium
Spring seat		Kit specific: SEAT-H1020DS (plus SS-3011-3 shim for the SPRK-H100DR-Z7)
Collets		KPR-5.5-7A-ST-32

Each kit pairs its SPR-H1000D, SPR-H1005D or SPR-H100DR double springs with RET-K24Z7/T1 titanium upper retainers, SEAT-H1020DS lower spring seats (with an SS-3011-3 shim for the SPRK-H100DR-Z7) and KPR-5.5/7A-ST collets.

Installed height is the gap, with the valve shut, between bottom seat and top retainer. Quoted loads apply only at the stated height: 36.4 mm for the first two kits, 33.4 mm for the SPRK-H100DR-Z7. If the distance grows, after skimming the head for example, each extra millimetre removes as many newtons as the rate indicates. The table below collects these values.

	SUPERTECH
Installed height	36.4 mm (SPRK-H1000D-Z7, SPRK-H1005D-Z7) 33.4 mm (SPRK-H100DR-Z7)
Seat pressure at this height	298 N (SPRK-H1000D-Z7) 356 N (SPRK-H1005D-Z7) 383 N (SPRK-H100DR-Z7)

Technical guide

Our brands

SUPERTECH designs and manufactures racing valvetrain components in California, with more than three decades behind it. Every batch of springs is X-rayed, ultrasonically tested and laser-inspected before leaving the plant. Valves, guides and retainers complete the range.

How to choose

A high seat load presses the valve onto the cam well past the speed the stock spring can follow: raised limiter, livelier cam, turbo added. Here you get 298 N, 356 N and 383 N on the seat, then 934 N, 979 N and 1041 N at 12.5 mm lift depending on the kit. Look for balance: an over-firm spring tires cams and tappets. These kits suit built engines rather than relaxed road use.

Criterion	Key point
Choosing the pressure	Each version's lbs number is the seat load in pounds: 67, 80 or 86, i.e. 298, 356 or 383 N. Set it against your cam lift, to be kept under 15.7 mm with the first two kits and under 14.9 mm with the last, your target revs and any boost. Going harder than needed brings nothing and speeds up valvetrain wear. Full detail is in the characteristics table.
Kit contents	The three kits include the same surroundings for the double spring: RET-K24Z7/T1 titanium top retainers, SEAT-H1020DS bottom seats and KPR-5.5/7A-ST collets, plus an SS-3011-3 shim for the SPRK-H100DR-Z7. Only the springs change: SPR-H1000D, SPR-H1005D or SPR-H100DR.

When reinforced springs become necessary

Cam with more lift than the stock one
Rev limiter to be raised markedly
K24 boosted by a turbo or supercharger
Car used on track or in hillclimbs
Tired springs: valves floating before the limiter

Compatible vehicles

Model	Engine code	Power	Years
Acura ILX 2.4	K24Z7		2012-2015
Honda Civic IX (FB) 2.4	K24Z7		2011-2016

Important: these kits are for the K24Z7 engine of the Honda Civic IX 2.4 and Acura ILX 2.4, from 2011 to 2016. Other engines of the K24 family, such as the K24Z3, are not covered on this page.