I have just completed a major rebuild, and in testing the engine with no exhaust pipe attached, (besides being very loud) I noticed a very small amount of wetness spattering out of the exhaust port in the manifold with the exhaust. It did not really amount to any significant quantity, and was just enough to show up as a very light splatter on a boart held up just behind the exhaust port for a few minutes.
I later attached a 'shop' water muffler built of galvanized pipe from the exhaust port and into a trash can filled with water, which quited things down very nicely so I could hear how the engine sounded running (I built a wooden lid for the can with one hole just big enough for the pipe to pass thru and into the water, and another hole to which a 1.5" hose is attached, leading exhaust fumes well away from the shop). Timing sounded good, and generally the engine sounded like it was running well. RPMs were easily attained, and it would run smoothly at Idle as well as high throttle.
After running this way for a while, I let the engine cool and inspected the pipe. Sure enough, there was was slight bit of dampness inside the pipe (far enough away from the water to feel like that did not cause the dampness). I removed the pipe flange attaching it to the manifold and inspected the manifold itself. It seemed dry enough.
I had all housings magna fluxed and checked for cracks. Everthing came back fine. All my manifold studs are sealed with JB weld, and all my head studs dry-fit very snugly, and are permanantly fitted with Lock-tite Red. Compression is as expected with a non-broken in engine, about 90PSI.
What is going on?
I later attached a 'shop' water muffler built of galvanized pipe from the exhaust port and into a trash can filled with water, which quited things down very nicely so I could hear how the engine sounded running (I built a wooden lid for the can with one hole just big enough for the pipe to pass thru and into the water, and another hole to which a 1.5" hose is attached, leading exhaust fumes well away from the shop). Timing sounded good, and generally the engine sounded like it was running well. RPMs were easily attained, and it would run smoothly at Idle as well as high throttle.
After running this way for a while, I let the engine cool and inspected the pipe. Sure enough, there was was slight bit of dampness inside the pipe (far enough away from the water to feel like that did not cause the dampness). I removed the pipe flange attaching it to the manifold and inspected the manifold itself. It seemed dry enough.
I had all housings magna fluxed and checked for cracks. Everthing came back fine. All my manifold studs are sealed with JB weld, and all my head studs dry-fit very snugly, and are permanantly fitted with Lock-tite Red. Compression is as expected with a non-broken in engine, about 90PSI.
What is going on?
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