Visual Identification:
* Valve Cover: The H22 has a distinctive "H22" cast into the valve cover, usually near the front. The B18C has a smoother, more rounded valve cover with "B18C" cast in.
* Intake Manifold: The H22 intake manifold is longer and more curved than the B18C's. It also has a distinctive "hump" near the throttle body.
* Exhaust Manifold: The H22 exhaust manifold has a larger diameter and is typically cast in a single piece. The B18C manifold is smaller and often has a more intricate design.
* Oil Pan: The H22 oil pan is deeper than the B18C's and often has a different shape.
Engine Features:
* Displacement: H22 is a 2.2-liter engine, while the B18C is a 1.8-liter engine.
* Cylinder Head: H22 has a dual overhead cam (DOHC) design with VTEC (Variable Valve Timing and Lift Electronic Control), while the B18C is also DOHC with VTEC.
* Horsepower: The H22 typically produces more horsepower than the B18C.
Additional Clues:
* Vehicle Model: The H22 was used in various Honda models, including the Prelude, Accord, and NSX. The B18C was found in the Integra GS-R and Civic SiR.
* VIN Number: Decoding the VIN number can reveal the engine code.
* Engine Tag: The engine block itself may have a tag with the engine code.
Important Note: If you're unsure, it's always best to consult with a mechanic or someone with experience identifying Honda engines.
Key Differences Table:
| Feature | H22 | B18C (GS-R) |
|---|---|---|
| Displacement | 2.2 liters | 1.8 liters |
| Valve Cover | "H22" cast in | Smoother, "B18C" cast in |
| Intake Manifold | Long, curved, with a "hump" | Shorter, straighter |
| Exhaust Manifold | Larger diameter, usually single piece | Smaller, more intricate |
| Oil Pan | Deeper, different shape | Shallower, different shape |
| Horsepower | Higher | Lower |
Let me know if you have any other questions about Honda engines!
