I had someone work on my exhaust system and now find that the bottom threads on the exhaust manifold are partly stripped out. It seems that previously a different length bolt (shorter) was used to secure the riser flange to the manifold and as a result the outermost 1/4 inch of threads were pulled out with the bolt, which leaves about 1/4 inch of threads still there.
Is this amount (1/4 inch) adequate to reattach the riser and flange to the manifold? If not, what are my courses of action?
Second issue: The riser/dry section of the exhaust is 1 & 5/8 inch OD pipe (I believe bronze) and the pipe that the hose to the muffler fits on is 1 & 5/8 inch OD with threads (not hose barb). The hose is 1 & 5/8 inch ID. The input flange to the muffler is 1 & 1/2 outside diameter. What started me on this job was a leak in this hose where it attaches to the muffler. When I took the muffler out I found that the plywood platform it sits on to be completely dissentegrated from rot and that the inside membrane of the hose was completely distorted. So this has been going on for some time. I now have a 1 & 1/2 inch hose barb to 1 & 5/8 inch pipe fitting. But now I'm thinking that this reduces the ID of the system to less that 1 & 1/2 inches and that it might cause more back pressure on the system. So, what is the ideal ID of an exhaust system for an Atomic Four?
I will really appreciate your insight on these two questions.
John
Is this amount (1/4 inch) adequate to reattach the riser and flange to the manifold? If not, what are my courses of action?
Second issue: The riser/dry section of the exhaust is 1 & 5/8 inch OD pipe (I believe bronze) and the pipe that the hose to the muffler fits on is 1 & 5/8 inch OD with threads (not hose barb). The hose is 1 & 5/8 inch ID. The input flange to the muffler is 1 & 1/2 outside diameter. What started me on this job was a leak in this hose where it attaches to the muffler. When I took the muffler out I found that the plywood platform it sits on to be completely dissentegrated from rot and that the inside membrane of the hose was completely distorted. So this has been going on for some time. I now have a 1 & 1/2 inch hose barb to 1 & 5/8 inch pipe fitting. But now I'm thinking that this reduces the ID of the system to less that 1 & 1/2 inches and that it might cause more back pressure on the system. So, what is the ideal ID of an exhaust system for an Atomic Four?
I will really appreciate your insight on these two questions.
John
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