Field Notes: A Closer Look at the Engine Assembly for 4A91T 81 kW 1.5L for Mitsubishi
If you wrench on compact Mitsubishis, you already know the 4A9 family. The 1.5L 4A91T is the punchy, downsized turbo that shops keep asking me about. To be honest, I didn’t expect this much interest in complete assemblies, but the replacement market is buzzing—drop-in reliability beats piecing together short-blocks and ancillaries.
What it is and where it fits
This unit is a complete, ready-to-install engine assembly for select models running the 1.5L turbo architecture—think compact sedans and hatches where efficiency and mid-range torque matter. Many customers say it drops in smoother than expected, though ECU calibration and emissions gear can vary by market. Always match by VIN and ECU code, not just the name Engine Assembly for 4A91T 81 kW 1.5L for Mitsubishi.
Specs at a glance
| Parameter | Specification (≈ / real-world may vary) |
|---|---|
| Rated power | 81 kW @ ≈5500 rpm (SAE J1349/ECE R85) |
| Displacement | 1499 cc, inline-4, DOHC 16V, MIVEC VVT |
| Induction | Turbocharged, intercooled |
| Torque | ≈143–150 Nm @ 3500–4200 rpm |
| Block/head materials | Aluminum alloy with cast-iron liners / aluminum head |
| Fuel system | Multi-point EFI; 95 RON recommended |
| Emissions | Euro 4–5 depending on ECU & aftertreatment |
Process, testing, and service life
Manufactured in Hebei, China (289 Heping East Road, Chang’an District, Shijiazhuang), the assembly uses CNC-honed bores, balanced rotating assemblies, and torque-angle fastener control. Methods follow IATF 16949/ISO 9001 quality routines; power verification aligns with SAE J1349 or ECE R85.
- Materials: nitrided crank journals, moly piston rings, heat-treated camshafts.
- Tests: hot-run dyno, oil pressure ≥ 250 kPa @ 3000 rpm; compression ≈ 11.5–13.5 bar/cyl; coolant and oil leak checks; turbo shaft endplay within spec.
- Expected service life: ≈180,000–250,000 km with 5W-30 API SP and 8–10k km intervals.
Where it’s used and why it matters
Typical scenarios: fleet refresh of compact sedans, dealer-level warranty swaps, and performance-retentive rebuilds where low-end spool and daily drivability matter. In fact, several shops told me fuel economy recovered immediately after installing a new Engine Assembly for 4A91T 81 kW 1.5L for Mitsubishi, likely due to restored compression and injector spray patterns.
Vendor comparison (real-world snapshot)
| Vendor | Testing | Certs | Warranty | Lead Time | Price |
|---|---|---|---|---|---|
| Oujia Engine (Hebei, CN) | Hot-run dyno + leak-down | IATF 16949/ISO 9001 (vendor docs) | 12–18 months | ≈7–15 days | Mid-range |
| Reman Brand A (EU) | Bench test, brief run-in | ISO 9001 | 12 months | 2–4 weeks | Higher |
| Used (salvage) | Unknown | — | As-is/short | Immediate | Lowest |
Customization and case notes
Options often requested: ECU variant matching, turbo spec confirmation, loom/connectors, and emissions ancillaries. One taxi fleet reported a 12% drop in fuel use after replacing high-mileage units; a dealer partner cut bay time by ≈3.5 hours thanks to pre-installed ancillaries on the Engine Assembly for 4A91T 81 kW 1.5L for Mitsubishi.
Quick tips
- Verify power rating method (SAE J1349 vs ECE R85); dyno numbers differ slightly.
- Prime oil system; first start on fresh 5W-30, then swap filter at 1,000 km.
- Keep factory heat shields—turbo underhood temps are no joke.
Sources and standards:
- SAE J1349: Engine Power Test Code – Spark Ignition and Compression Ignition Engines [SAE International].
- ECE R85: Measurement of the Net Power and the 30 min Power of Electric Drive Trains and Internal Combustion Engines [UNECE].
- IATF 16949:2016 Quality Management System for Automotive Production [IATF].
Oujia has been providing the professional engine parts for 17 years.connecting rod As a reliable supplier and partner, Oujia focuses on various engine parts, especially on gasoline engine parts and on diesel parts for passenger cars.exhaust valve Oujia not only provides high and stable quality and excellent services to our customers, but also provides long-term self- brand creation and OEM services for our overseas customers.engine assembly Our company products mainly include: engine, cylinder head, cylinder block, crankshaft, piston, piston ring, intake valve, exhaust valve, timing kit, gasket set, connecting rod, crankshaft bearings, connecting rod bearings, intake camshafts, exhaust camshafts, water pumps, oil pumps Etc.piston kit focus on the aftermarket, our products are guaranteed for 100,000 kilometers.Our products are exported to Germany, Russia, Brazil, Japan, the United States, and the Middle East. We are a trading company. We choose the most stable quality factories in China to cooperate with. We cooperate with 7,600 factories in China and sell 74,000 products each year. , we have 26,000 models in stock.gasket set manufacturer|super blog