Can GM build a really good 3 cylinder engine though? That is the question. Once upon a time, their 4cyl engines were awful in the USA. Since the Ecotec family came out of Russellheim, they are much better. Can they build a very good 3cyl? I don't know.
The development was throughout GM not just Opel but then again Opel is GM. Ecotec stands for 'Emissions Control Optimisation TEChnology
Per Wiki
"Ecotec
The Ecotec name was adopted in 2000 for the new generation of Family II engines. The name was already used for the Opel GM Family II engine, Family 1 and Family 0 ranges. GM intends this new Ecotec to become its global 4-cylinder, and it has already fully replaced their OHV I4 line.
The Ecotec Family II is a DOHC 4-valve design with an aluminum block and head (L850 for 86 mm bore applications, and L880 for 88 mm bore), designed for displacements from 1.8 to 2.4 L. It was developed by an international team of engineers and technicians from Opel's International Technical Development Center in Rüsselsheim, Germany, GM Powertrain in Pontiac, Michigan, and Saab in Trollhättan, Sweden. Much of the development work on this project was carried out by Lotus Engineering, Hethel, United Kingdom. The engine uses aluminum pistons and cast iron cylinder liners. Vibration is reduced with twin balance shafts.
The current Ecotec line is manufactured in Tonawanda, New York and Kaiserslautern, Germany. Until the discontinuation of Saturn, it was also produced at a plant in Spring Hill, Tennessee."
As far if GM can build a good I 3 well they already have with Family 0 Ecotec
Per Wiki
GM Family 0 engine
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The Family 0 is a family of inline piston engines that was developed by GM Powertrain, a subsidiary of Opel, as a low-displacement engine for use on entry-level subcompact cars from Opel/Vauxhall.
The engine was first introduced in 1996 Opel Corsa as a 3-cylinder version. It features light cast-iron engine block, aluminum cylinder head with Hollowcast camshafts and DOHC valvetrains driven by chain. Modern versions use variable intake technology.
* 1.0 L Straight-3 (973 cc): 40 kW / 55 hp, 82 N·m (60 lb·ft) @ 2800 rpm
* 1.0 L Straight-3 (973 cc): 43 kW / 58 hp, 85 N·m (63 lb·ft)
* 1.0 L Straight-3 (998 cc): 73.4 mm (2.89 in) bore, 78.6 mm (2.94 in) stroke, 10.5:1 compression.
* 1.2 L Straight-4 (1199 cc): 72.5 mm (2.85 in) bore, 72.6 mm (2.86 in) stroke, 10.1:1 compression, 75 hp (55 kW) @ 5600 rpm, 110 N·m (81 lb·ft) @ 4000 rpm
* 1.2 L Straight-4 (1229 cc): 73.4 mm (2.89 in) bore, 72.6 mm (2.86 in) stroke, 10.5:1 compression