Reinforced valve spring kit Toyota Lotus 2ZZ-GE

Toyota and Lotus engine covered

The 2ZZ-GE is Toyota's 1.8 litre four-cylinder with 16 valves, twin overhead camshafts and VVTL-i variable valve timing and lift. It powers the Celica, Corolla, Matrix and Will VS, as well as the Lotus Elise, Exige and 2 Eleven.

On all 16 valves the kit replaces the original spring and its upper retainer; the factory lower spring seat and collets stay. SUPERTECH supplies a single spring with its RET-T2Z/T2 upper retainer. With FERREA, the kit also supplies the lower spring seat and collets.

SUPERTECH and FERREA reinforced valve spring kits

A valve that drops back late onto its seat loses sealing and can brush the piston. Only a spring with enough load keeps it against the cam without respite, even when the engine spins fast: without it, valve float sets in.

Installed at 38.5 mm, this single spring exerts 325 N (73 lbs) on the seat and accepts a cam lift of up to 12.5 mm. For FERREA, the titanium upper retainer of its KT4030 kit, paired with a double spring, weighs 40 % less than a steel equivalent.

Valve spring kit technical specification

Valve spring kit fitting details

The SUPERTECH kit SPRK-A2416-T2Z contains SPR-A2416 single springs and RET-T2Z/T2 upper retainers. The original lower spring seat and collets remain in place. The FERREA kit KT4030 contains S10123 double springs, E11097 titanium upper retainers, SL1105 lower spring seats and K10094 collets.

A spring's load depends on its height: the kit figure is stated at 38.5 mm, taken at rest, taken between the lower seat and the top retainer. A taller measurement, after machining the head for example, lightens the seat load by the spring rate for every extra millimetre. The next table pairs this height with the seat load.

Technical guide

Our brands

	SUPERTECH is a Californian supplier of competition valvetrain parts, three decades and more in the trade. Spring batches are scanned by laser, tested with ultrasound and X-rayed before they leave the premises, so that no concealed defect ever ships out to a customer.
	FERREA has made high-performance valvetrain parts in Florida since 1978: valves, springs, retainers and tappets. Its spring kits, titanium retainers included, suit race engines and strong street builds alike, with parts machined in its own workshops.

How to choose

As soon as you want this 1.8 litre to climb higher in the revs or to take a livelier camshaft, the standard spring turns into the weak point. The SUPERTECH kit gives 325 N on the seat and tolerates up to 12.5 mm of lift: make sure your camshaft stays under that figure before ordering. SUPERTECH states no open load for this kit. An excessive load achieves nothing, it tires the cams and tappets; aim at what your camshaft requires, without overdoing it. If in doubt, first compare your camshaft lift with that limit. It takes a minute and avoids unpleasant surprises. The FERREA kit, with double springs, aims at the liveliest cams.

When reinforced springs become necessary

• Cam with more travel than the standard one
• Supercharger added or pushed harder on this engine
• Rev ceiling raised by the tuner
• Regular track or competition outings
• Standard springs worn by age and mileage

Compatible vehicles

OEM part number (valve spring): 90905-01060, 90905-01061, 90905-01063

Related products

With the head off, inspect the valves too. One button below leads to the inlet valves, the other to the exhaust valves, both for the 2ZZ-GE: