Location: Cottage Grove, OR
(71.142.240.190) | On the later coaches, the lines that are on the inside of the frame rail were moved to the outside of the frame rail. I don't know when this occured. I have a set of the drop down style manifolds and so will be interested in Bill's pictures and other comments after installation. I was able to see his mock up on an engine on a stand when i was at his house after the Four Corners rally and it looked good. There is a good set of pictures of the manifold and shields on the Yahoo site. I need to revise my exhaust system to eliminate the constant generation of leaks and eliminate the pumpkin can flex coupling i now am operating with.
I have purchased the SS flex couplings that Barn is talking about but need to decide what else I am going to change and do it all at once. One routing alternative as suggested by Eric W. of #587 is to send the driver side exhaust out to the right as that would allow room for the muffler and then the passenger side out the driver side. That would have one going out each side. A flex coupling would be included on both lines. He also has used sweeps rather than bent tube to get a full exhaust tube diameter in the curves as well. Coming back from Oregon, he checked the exhaust manifold color at the top of the 8 mile 6% grade and the manifold had only a slight red color when with his old system it would have been glowing red.
I think that with any system, a heat shield mounted somewhere (on the frame?) to reduce the heat load on the various componenets would be good. Barn's comments about heat rising also need to be considered.
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440 Exhaust manifolds
