Barr Marine Exhaust Manifolds
Connected to the motor is a fatigue manifold having its exhaust inlets matching the fatigue outlet harbors of this motor.
Circulating cooling water through the water-jacket surrounding the exhaust gas chamber cools this manifold.
On exhaust end associated with the manifold is an exhaust connector. This connector is an intermediary between your manifold and an exhaust hose or pipeline. Tis connector in addition mixes the exhaust gases with water to help cool the fumes, therefore runs as a means for directing the gas and water outﬂows to ensure a connection is made between your manifold together with fatigue tubing. Specific attention needs to be paid to the general
level diﬀerence between the center line of the exhaust end of center type of the transom overboard exhaust ﬁtting, the exhaust connector
can an be exhaust dump or drop of a convenient position. In those instances in which the manifold isn't appreciably above or is underneath the overboard ﬁtting, an exhaust riser is used. By design, the riser acts as a dam to help keep both exhaust-cooling liquid and seawater from back ﬂooding into th motor and destroying it.
From an engineering view, probably the most critical design requirement for exhaust methods should reduce backpressure from the engine to a minimum. Backpressure is the stress that builds up into the exhaust manifold engine exhaust outlets. The lower the stress into the fatigue, the more eﬃcient the procedure of this engine. Minimal backpressure is attained by designing exhaust passages to attenuate opposition on ﬂow of
gases also to prove for an uniform gasoline ﬂow from all cylinders. Barr manifolds and exhaust connectors are created to lessen backpressure. Quite often, aﬅer changing an OEM manifold with Barr replacement parts, even more r.p.m.’s are achieved.