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Location: Ignacio Colorado
(72.161.121.148) | There is a different style of exhaust manifold for the 440. It was only used on the van chassis motorhome (class C ) and dodge and plymouth vans with a big block engine. They seem to have been installed on the drivers side of the van to keep the heat low and away from the drivers feet. Some of us feel that this manifold may end the baking of the valve cover gaskets and the flange is a type that has no gasket so that is one / two less leaks to deal with. The power steering resivior needs to be retrofitted to have a return that does not point at the manifold. I found one on a 66-67 new yorker that has the return line going straight up to the top.
I just broke an original exhaust manifold on #902 ( broke off about 2.5" above the exhaust pipe flange ). I will change both the manifolds to this lower style and hope to eliminate the valve cover gasket failure and the breaking of manifolds that have the long downspout. Also the beveled pipe flange eliminates the pipe to manifold leaks. i will get pictures sent in soon. Also better ( double wall ) spark plug heat shields, with the plug wires going over the valve cover.
Bill | |
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Location: Ignacio Colorado
(72.161.121.148) | I must thank Louis Cruse for finding the lower style manifolds and realizing there potential. Otherwise I would just be replacing the brocken manifold with another original style Thanks Lou. | |
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Location: Kingsley Michigan
(66.82.9.83) | The big question is why did you break the first on---cause this will--according to Murphys law and other forces of Newton et al---happen again if the problem is not identified. I found a stainless steel flex coupling mounted close as possible to the manifolds eliminated my constant fight with leaks at the collectors---and copper gaskets! The thinking here is that as the engine torques---the movement has to go somewhere---so the coupling allows for that---cast iron hates movement---- | |
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Location: Oslo Norway
(193.212.109.62) | I really like the idea of the low style maifolds.
But do we have a picture showing how close it sits to the coach frame. The frame gets very very hot from the original ones is it worse or better with the lower style? I might put a smile on a few faces by saying so but I really do not like the idea of those hot spots on my frame. Could be solved with som shields i guess.
Barney you are absolutely right, flex couplings (and good hangers) is the way to go on any system. I have not sorted my hangers yet will have to install the new genset first to see how to do it best.
Kjetil | |
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Location: Kingsley Michigan
(66.82.9.83) | Heat shields work---any piece of tin helps reflect and barrier the offended areas---but watch out for the flume effect----Heat rises! I found that fiberglass heat wrap works goo---as long as you only use one layer of it--cause it has to breath too---
As far as hangers----as soon as I get my camera out---I will post pics of the truck driver rubber tie downs I use---to hook to a loop right before the muffler and after the flex coupling to give some float to the system and and at the same time--adequate support. The tail end of the muffler is on a flexable rubber/canvas composite strip supprt so it doesn't move (that much). Sheet metal with a x crease in it and a slight edge (for some ridgidity and now noise from floping in the wind---) is installed above the mufflers to reflect the heat awat from the rest which is really tight against the frame-- All works good--- | |
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Location: Ignacio Colorado
(72.161.118.217) | To answer Barney's question of why. #902 came to me equiped with a turbocharged 440I. That motor had an unbelievable thirst for oil. after a top end rebuild and worse oil consumption, and new nicknames I may never here the end of. I replaced the engine with the rebuilt engine from #412 my parts coach. during the test drive it lost power. The turbo was coming apart and sending small parts threw the engine closing up the spark plug gap along their way. Off came the turbo and the exhaust system from the parts coach was used. It exits coach in front of the drivers side rear wheels. It hangs too low. I was pulling into a gas station in my home town (thankfully) and when the reat tires fell into the dip (curb-gutter) the system made contact and the damage was done, Manifold snaped right off. I need to pull the busted manifold off and get some pictures with a low style manifold. I will make a totaly new exhaust system for the coach that has plenty of ground clearance and exits under the generater. | |
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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.
Press on, | |
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