III. S-21 or 4C90 “Andoria”?

So far, I was looking for an Andoria 2.4l 4C90 engine based Żuk: recent, as fitted since 1991, and diesel with 7L/100km consumption instead of 14L/100km for the 2.1l S-21.

S-21 itself is an improvement of the M-20, original engine of the FSO Warszawa, basis of both FSC Żuk and ZSD Nysa van. So we are talking about quite an old design.

	Żuk A 03 ’58	Żuk A11B ’76	Żuk A 07 ’91
Total lenght (Długość całkowita):	4310 mm	4400 mm	4400 mm
Engine (Silnik):	M-20	S-21	4C90
Cylinders (Liczba cylindrów):	4	4	4
Układ rozrządu:	SV	OHV	SOHC
Displacement (Pojemność skokowa):	2120 cm³	2120 cm³	2417 cm³
Maximum power (Moc maksymalna):	54 KM	70 KM	70 KM
Maximum torque (Moment maks.):	122 Nm/2200 rpm.	150 Nm/2500 rpm.	146 Nm/2500 rpm.
Fuel consumption (Zużycie paliwa):	14 l/100 km	14 l/100 km	7 l/100 km
Maximum speed (Prędkość maksymalna):	90 km/h	100 km/h	95 km/h
Pow. skrzyni ładunkowej:	4 m²	4,6 m²	4 m²
Ładowność:	800 kg	950 kg	900 kg
Masa własna:	1340 kg	1400 kg	1400 kg
Number of gears (Liczba biegów):	3+1	3+1	4+1

Clearly, an M-20 based  Żuk  is not an option: no power (54 bhp), not much torque and mad fuel consumption.

However S-21 is said to be reliable, easy to maintain and fix. The fuel consumption is a no-go, obviously, but a fair amount of Żuk are fitted with LPG system. That could be a valid alternative to a 4C90.

A 4C90 being diesel SOHC, Single OverHead Camshaft, requires, by principle, less attention than petrol OVH, OverHead Valve (no ignition/timing issue, etc).