How to Build an LS VTec
An LS/VTEC engine is made by combining a Honda B-block LS engine with a DOHC VTEC header, which many car enthusiasts build in order to get more horsepower out of their automobile. This is achieved by bringing more air in and out of the combustion chamber through the cylinder heads, which results in more torque, better acceleration and increased power. There are a number of B-block engines available that can handle this type of conversion, and opting for this upgrade instead of replacing the LS with a GS-R or Type R block will save money in the long run.
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Instructions
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Choose the type of engine block you want to modify. Most non-VTEC (more commonly called LS) B-series blocks are easy to find and can be purchased at low cost. VTEC and LS blocks are very similar in appearance and their rotating assemblies are the place to distinguish between the two types. The aluminum girdle as well as under-piston oil squirters and an oil cooler will be visible in a VTEC model. Without these specifications, the block is an LS.
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Identify the VTEC head you want to attach to the LS B-block. The correct models that will fit best can be removed from most early 90's model Hondas and Acuras. The head-bolt patterns are similar on VTEC and non-VTEC heads, so make sure you have the correct type. One way to distinguish between the two is that the VTEC has bigger intake and exhaust as well as wider diameter valves.
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Remove the existing head from the LS engine block, making sure to include the throttle body, intake manifold and fuel rail. The upper portion of the intake manifold will have to be taken off as well.
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Modify the engine block so that it corresponds correctly to the new VTEC head. This includes making adjustments for a new ECU, which switches operations between the two camshaft profiles that will be present in the new engine when it is finished. The ECU monitors things like oil pressure, engine temperature, and throttle in conjunction with the output of the engine and the speeds the vehicle is running at any given time. The block will also need to be modified if a knock sensor is required.
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Apply necessary modifications to the VTEC head so that it will fit the LS engine. This includes taking care of any oil supply plug adjustments, pipe taps, and drilling of holes for dowels to ensure that the head sits properly on the block.
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Adapt and apply any custom fittings for the new block. Wiring the electrical distributors to be compatible with the chosen ECU, upgrading timing belts and water pumps, confirming that the fuel rail, pressure regulator and injectors match the ECU's standards, and checking the emissions, cooling and power steering systems are all very important to finishing this project successfully.
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Tips & Warnings
A LS/VTEC engine is not suggested for all car owners, only for those who rev their engines up at high RPMs and want increased horsepower with less torque.
References
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