Intake manifold/cylinder head internal vacuum leak
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Occasionally, you may experience a vacuum leak into the intake ports from the crankcase of the motor due to the intake manifold / cylinder head interface not being machined parallel. Here, I'm talking about looking at the manifold from an end view, from the front or rear of the car for instance. Unless you're using all brand new parts, you have no way of knowing if the heads or manifold have been machined by the previous owner, so the interface at the manifold/head could be out of parallel. In other words, the gasket might be pinched tightly at the top of the port and sealing fine, but might be wide open to the crankcase at the bottom of the port. The manifold may also be warped a little. No amount of propane or carburetor cleaner will find such a leak. The best way is to insure the elimination of such a problem while building the motor. | Occasionally, you may experience a vacuum leak into the intake ports from the crankcase of the motor due to the intake manifold / cylinder head interface not being machined parallel. Here, I'm talking about looking at the manifold from an end view, from the front or rear of the car for instance. Unless you're using all brand new parts, you have no way of knowing if the heads or manifold have been machined by the previous owner, so the interface at the manifold/head could be out of parallel. In other words, the gasket might be pinched tightly at the top of the port and sealing fine, but might be wide open to the crankcase at the bottom of the port. The manifold may also be warped a little. No amount of propane or carburetor cleaner will find such a leak. The best way is to insure the elimination of such a problem while building the motor. | ||
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