Posted on August 11, 2021 by promarengine
Promar Engines continues to lead the industry in research and development being one of the first manufacturers to build the 6.2L L86 Ecotec3 engine. Ecotec (Emissions Control Optimization TEChnology’ is a General Motors (GM) trademark that refers to a series of emissions technologies that were implemented throughout a range of GM engines. The most popular version of this engine is the Ecotec3. Ecotec3 is the name used on General Motors’ Small Block Gen 5 Engines. All include direct injection, cylinder deactivation and continuously variable valve timing, either in V6 form of 4.3L or V8 form of either 5.3 or 6.2 liters.
This article focuses on the 6.2 L EcoTec3 (VIN Code “J”) engine. The L86 is an LT1 engine modified for truck use with a compression ratio of 11.5 to 1. The engine is rated at a peak 420 horsepower and 460 lb-ft of torque, which are relatively high output ratings for a naturally aspirated engine that displaces 376 cubic inches, the result of the engine’s relatively high compression ratio. Due to the high compression ratio, the engine is required to run on a minimum 91 octane gasoline to avoid detonation/knocking.
As always, Promar puts these engines through our rigorous manufacturing process and they are assembled with the industries best parts including a new OEM Cam Phaser/VVT, Active Fuel Management (AFM) lifters and Melling oil pump.
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| Engine: | General Motors 6.2L EcoTec3 V-8 | |||
| Type: | Generation V small block V-8 | |||
| Applications: | GMC Sierra 1500 | 2014 – current | ||
| Chevrolet Silverado 1500 | 2014 – current | |||
| GMC Yukon Denali | 2014 – current | |||
| Cadillac Escalade | 2014 – current | |||
| Assembly Plant(s): | Tonawanda Engine Plant, Tanawanda, NY St. Catherines Engine Plant, St. Catherines, Ontario, Canada | |||
| RPO Code: | L86 (vin code "J") | |||
| Displacement: | 376 CID, 6.2 liters | |||
| Cylinder Head Material: | Cast aluminum | |||
| Engine Block Material: | Cast aluminum | |||
| Compression Ratio: | 11.5 : 1 | |||
| Firing Order: | 1 – 8 – 7 – 2 – 6 – 5 – 4 – 3 | |||
| Cylinder Bore Dia: | 4.065 in (103.25 mm) | |||
| Cylinder Stroke Len: | 3.622 in (92 mm) | |||
| Aspiration: | Naturally aspirated | |||
| Fuel System: | Direct injection, return-less fuel system | |||
| Ignition: | Coil-near-plug, 8 individual ignition coils | |||
| Valvetrain: | 2 valves per cylinder, OHV, hydraulic roller lifters, variable valve timing (VVT) | |||
| Oil Capacity: | 8.0 qts w/ filter change | |||
| Fuel Requirements: | Premium unleaded fuel, minimum 91 octane | |||
| Emissions Equipment: | catalytic converter, positive crankcase ventilation (PCV) | |||
| Max Engine Speed: | 6,000 RPM | |||
| Peak Horsepower: | 420 HP @ 5,600 RPM | |||
| Peak Torque: | 460 lb-ft @ 4,100 RPM | |||
| Engine Dimensions: | Length | Width | Height | |
| 29.6 in | 25.2 in | 32.2 in | ||
