Project 2200
Notes on GM’s pushrod four-cylinder engines, from the 1.8L L46 to the 2.2L and 2200.
Pick an engine below to read about it, or follow how the family developed.
Engine pages
- 1.8L L46 The starting point
- 2.0L LQ2 The early truck application
- 2.0L LQ5 The early 2.0L car engine
- 2.0L LL8 The later 2.0L chapter
- 2.2L LM3 The early 2.2L chapter
- 2.2L LN2 The core engine and later 2200
- 2.2L L43 The later flex-fuel application
Development
How these engines developedA work in progress. More details and source notes will be added as the research continues.
1.8L / The starting point
L46
The 1.8L L46 is the starting point for the engine family covered by Project 2200. The project follows its basic dimensions forward into the larger engines.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 74 mm |
Place in the development
The early engine establishes the 89 mm bore seen again in the 2.0L and 2.2L records. Its 74 mm stroke provides the first step in the family’s displacement comparison.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
1982 Cavalier service manual and GM Archive entries in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.0L / The early truck application
LQ2
The LQ2 gets its own entry because the project records identify it separately from the Cavalier’s LQ5. A shared displacement is not enough to treat their application-specific data as identical.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 80 mm |
Place in the development
The 1983 S-10 GM Archive entry identifies LQ2 and an 89 mm bore with an 80 mm stroke. This page keeps that truck entry separate from the passenger-car records.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
1983 S-10 GM Archive entry in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.0L / The early 2.0L car engine
LQ5
The LQ5 represents the early 2.0L passenger-car chapter. The larger displacement accompanies a longer stroke while the nominal bore remains 89 mm in the selected records.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 80 mm |
Place in the development
Compared with the L46, the selected LQ5 data increases stroke from 74 to 80 mm. The project also tracks piston pins, valvetrain measurements, and clearances to look beyond displacement alone.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
1983 Cavalier service manual and GM Archive entries in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.0L / The later 2.0L chapter
LL8
The LL8 is a separate chapter within the 2.0L family. It retains the nominal 89 × 80 mm geometry in the selected project records.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 80 mm |
Place in the development
Since the bore and stroke alone do not explain the distinction from LQ5, this chapter is organized around changes in the original records and the specific vehicle applications. Incomplete entries remain open rather than being carried forward automatically.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
1987 and 1989 Cavalier GM Archive entries in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.2L / The early 2.2L chapter
LM3
The LM3 entry introduces the early 2.2L chapter in this research. The nominal bore remains 89 mm while stroke increases to 88 mm.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 88 mm |
Place in the development
The increase from an 80 mm to an 88 mm stroke is the clearest dimensional step from the selected 2.0L records. Compression, piston geometry, and source discrepancies need their own year-by-year comparisons.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
LM3-labeled Cavalier GM Archive entry in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.2L / The core engine and later 2200
LN2
The LN2 is the center of Project 2200. Its page brings together the 2.2L records while keeping early versions, later 2200 versions, and vehicle applications distinct.
Engine overview
| Bore | 89 mm |
|---|---|
| Stroke | 88 mm |
Place in the development
The selected records retain 89 × 88 mm geometry, so the development story extends to the cylinder head, camshaft, lifters, rocker ratio, pistons, and assembly specifications. The 2200 chapter belongs within this development rather than being treated as a completely unrelated engine.
A closer look: 1992 Beretta
This selected example keeps the application attached to its figures.
| Deck height | 216.65 mm |
|---|---|
| Piston below deck | 0.7 mm |
| Cylinder head volume | 32.8 cm³ |
| Head gasket thickness | 1.50 mm |
Source: 1992 Beretta GM Archive entry in the project workbook.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
LN2-labeled service manual and GM Archive entries in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
2.2L / The later flex-fuel application
L43
The L43 deserves a separate profile alongside the later LN2 and 2200 research, particularly for the flex-fuel application covered by this project.
Engine overview
| Individual specification set | Source separation pending |
|---|
Place in the development
The current workbook includes a source column labeled with both L43 and LN2. Shared entries must be checked before being attributed exclusively to one engine. This preview therefore avoids presenting those shared measurements as uniquely verified L43 specifications.
Research areas
- Original specifications by year and vehicle
- Block, crankshaft, and piston details
- Cylinder head and valvetrain changes
- Differences from the preceding and following versions
Source notes
Shared L43/LN2-labeled service manual column in the project workbook. Selected research values are transcribed from the project workbook; the original manuals have not been independently reviewed for this demo. This is a starter profile, not a complete service reference.
The development
Follow the changes across the family, then open an engine profile for the individual chapter.
1.8L to 2.0L: a longer stroke
The selected L46 records list an 89 mm bore and 74 mm stroke. The early 2.0L records retain the 89 mm bore and increase stroke to 80 mm. LQ2 truck data and LQ5 passenger-car data remain separate in the research.
The later 2.0L chapter
The selected LL8 entries retain 89 × 80 mm geometry. The next layer of comparison looks at details beyond displacement, with each specification tied to its original application.
2.0L to 2.2L: stroke increases again
The selected LM3 and LN2 records list an 88 mm stroke with the same nominal 89 mm bore. This creates a clear dimensional progression through the family.
| Chapter | Example codes | Bore | Stroke |
|---|---|---|---|
| 1.8L | L46 | 89 mm | 74 mm |
| 2.0L | LQ2 / LQ5 / LL8 | 89 mm | 80 mm |
| 2.2L | LM3 / LN2 | 89 mm | 88 mm |
LN2 to the later 2200
Once the geometry reaches 89 × 88 mm, the research shifts toward changes in the head, valvetrain, pistons, and vehicle applications. The LN2 profile includes the later 2200 chapter; L43 has a separate profile for its application-specific research.
How changes are documented
Each comparison keeps the year, vehicle, engine identifier, and source together. A missing figure does not establish continuity, and a different published value does not by itself prove a redesign.
Demo overview based on selected entries in the current project workbook. Complete year-by-year specifications, production dates, and original source documents are not yet integrated.