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Toyota SZ Series Engines

Toyota SZ Series Engines 1
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Toyota SZ Series Engines 2

The SZ series has become for Toyot’y a kind of revival of the tradition of producing small engines. Once, the E series also played such a role, but for twenty years it had no “liter” class engines – this niche belonged to the Daihatsu department with its own developments.

Engine 4E-FE MeMZ-245 1SZ-FE 2SZ-FE
Working volume, cm 3 1331 1091 998 1296
Power hp. 86/5400 53/5400 68/6000 87/6000
Torque, Nm 120/4400 79/3200 90-95 / 4100 116/3800
Compression ratio 9.6 9.5 10.0 10.0
Cylinder diameter mm 74 72 69 72
Piston stroke mm 77.4 67 66.7 79.5
RON 92 92 92/95 * 92/95 *

Production of the SZ series began in January 1999 – a liter 1SZ-FE appeared on models of the Yaris / Vitz / Platz family. Later, a forced version of the increased volume was developed, however, it is difficult to explain the need to create a complete analogue of the already existing 2NZ-FE (apparently, it was necessary to raise the power without fail, while maintaining the layout of the power unit).

Cylinder block. While almost all 3rd-wave Toyota engines received sleeve-type aluminum blocks with an open cooling jacket, SZ retained a cast-iron block of a traditional design – which is very good in terms of durability.
The crankshaft is installed with de-hailing – the axes of the cylinders do not intersect with the longitudinal axis of the engine (crankshaft), which reduces the wear of the piston-cylinder pair and makes it possible to slightly increase the efficiency of the motor.

Toyota SZ Series Engines 3

Timing Drive. Both camshafts (DOHC 16V standard circuit) are driven by a fine pitch chain. In fact, it is something like a Morse chain, it is quieter than usual, but not so reliably fixed on gear pulleys. Therefore, special attention should be paid to the chain installation procedure – a number of cases of chain links leaping relative to the pulleys and, as a consequence, the “meeting” of valves with pistons have already been recorded.

Just in case, we give a drawing of the correct combination of marks on a chain (links with colored marks) and on pulleys.

Toyota SZ Series Engines 4

A two-row chain in theory should have a lower tendency to stretch than a single-row one on motors of other series, but practice does not confirm this yet, so some attention should be paid to its condition, and to the condition of the hydraulic tensioner with a damper.

Toyota SZ Series Engines 5

The 1SZ-FE engine is short-stroke (the piston stroke is less than the diameter of the cylinder), that is, rather “torsional” than high-torque. To correct this feature unsuitable for an exclusively urban car, the variable valve timing system (VVT-i) is called on. The VVT-i pulley mounted on the intake camshaft allows you to change the opening time of the intake valves within 60 °.
The valve drive is carried out either directly through the adjusting pushers (1SZ), or through rockers (2SZ, and it is worth paying attention to – withouthydraulic lifters). Valve seats – traditional, press-fit.

Toyota SZ Series Engines 6

Inlet and outlet. The location of the collectors on these motors is classic: the intake is at the rear, from the side of the engine shield, the exhaust is at the front. In accordance with new trends, the intake manifold is made of composite (in other words, plastic) and is a “spider” with pipelines of equal length. In order not to overheat the engine compartment, the catalyst was not combined with the exhaust manifold, but was moved under the engine.

Toyota SZ Series Engines 7

Lubrication system. The oil pump is not driven directly from the crankshaft, but by means of a chain, which increases undesirable loads on it. The oil filter is installed correctly – at an angle, but with the housing down and the hole up.

Ignition system. Engines from the very beginning have the DIS-4 system – separate coils located in the candle tip. Advantages – accuracy of spark supply, absence of high-voltage lines and rotating elements, fewer cycles of operation of each individual coil. Cons – significant overheating of the coils in the wells of the head of the block, the inability to adjust the ignition, sensitivity to the condition of the candles, in practice – more frequent failure of the coils.
The compression ratio is 10: 1, however, the engine is designed for ordinary gasoline (90th according to SAE, Regular in Japan, 92nd with us), some caution should be observed with cars in the European market – their control systems are configured for 95th.

Attachment Drive. Here, one long belt works on the drive of the coolant pump, generator, power steering and air conditioner. Of course, this made it possible to slightly reduce the length of the engine, but the load on the belt increased significantly, and its hydraulic tensioners were never distinguished by their enviable durability. In addition, it is impossible, if absolutely necessary, to remove the belt from the pulley of the jammed device – you won’t be able to travel without the “pump”. Because of the improved mountings – the units are not placed on the brackets, but on the tides of the cylinder block itself – the equipment turned out to be endemic (not unified with other models). The generator is not very good in terms of protection against dirt and water..

Toyota SZ Series Engines 8

Control system. SZ series motors use standard solutions similar to those described in the article “1ZZ-FE. Without error” (in fact, we compare SZ here with various design features of this engine).

For reference. Refueling tanks and some characteristics of models with engines of the SZ series (for example, Vitz SCP1 #).

Engine 1SZ-FE 2SZ-FE
Engine oil
(with filter replacement)
3,2 l 3.4 l
Coolant 4.7 / 4.6 L
(Manual / Automatic)
5.1 L
(CVT)
Idle speed 500-600 (manual transmission)
650-750 (automatic transmission)
550-650 (CVT)
Compression 15 bar (nom.)
11.5 bar (min.)
12 bar (nom.)
9.5 bar (min.)
Candles Denso K16R-U Denso SK16HR11
NGK ILFR5C11
Transmission Oil (Manual C550) 1.4 l
(API GL3 SAE 75W-90)
ATF (automatic transmission U440F) 5.5 l
(Type T-IV)
ATF (CVT K210) 5.5 L (CVT Fluid TC)

Specifications. Please be aware that the 1SZ-FE engine is Toyota’s weakest gasoline engine. Its 68 hp and 90 Nm for a fully-fledged vehicle with an equipped weight of about 900 kg is too small, all the more so the hydraulic booster, air conditioning, and the relatively lower efficiency of the machine take their share – therefore, the mediocre accelerating dynamics and low maximum speed should not surprise.

The real passport characteristics of the new car with a manual transmission are 13.8 from acceleration to hundreds and the maximum maximum speed is 155 km / h. With the machine, the nominal acceleration increases to 15.6 s, and the maximum speed drops at least 5 km / h.

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