|
Dave; I wish I were literate enough on my computer to get the picture to you but until then I'll try to talk you through it. Basically what you are doing is forming an "upside down can" which fits over the exhaust pipe and muffler. Now our tractors are many times stored in old bank barns with low ceilings so we have put 90 degree bends in the exhaust pipe. You do not need to do this! But with the 90 turn we had to fabricate the "can" on the muffler. So you need to... 1)-find a piece of metal tubing which will fit over the largest diameter of the muffler and still give you at least a 1/4"clearance. For example if you muffler measures 6&1/2", you need a tube at least 6&3/4"(internal). What this does is give enough clearance for your intake air to pass through on its way to the carb. Make sure you use a heavy enough metal to weld on and to stand up to vibration. I would not recommend tin. 2)-now you need to find something to cap off the top of this tube to form the "can". I used an old junk disc blade since most farms have them laying around for other uses. I used it for two reasons;one being it had the proper hole size through the center to fit over the top pipe on the muffler, and secondly it was fairly heavy which would(my opinion) hold down the assembly with it's weight as well as decrease vibration damage. So find a piece of 1/8"or 3/16" plate, and cut a hole large enough to fit over your top pipe on the muffler then weld the plate to the tube from step one. This will give you your "can". 3)- now you need some way of getting the hot air from around the outside of the muffler(inside the "can"),to the air cleaner[an outlet]. A piece of metal tubing or pipe the same diameter as your air intake pipe on th air cleaner would be most suitable. We welded this piece(approx. 1.5" long) to the top on the metal tubing around the muffler(top of side of the "can". Hole should face back towards air cleaner). You can cut the hole through the "can before or after you weld on the outlet tube. 4)- lastly find some way to get the air from the outlet of the "can" to the top of the air cleaner(with precleaner removed). We just happened to have an old tail pipe from some vehicle which had the right diameter to fit the top of the air cleaner and also had a 90 bend to get to the outlet of the "can". I believe you could also find a radiator hose with a 90 degree bend to use and would work well. Some final thoughts I have. We ended up having to "clamp" the bottom of th "can" to the muffler because of excessive vibration. We used three bolts equal distance , bored the holes in th "can" and tapped them. The bolts have jam nuts then to keep them from backing out. Also, altough the air does not get real hot, I think you should make sure you don't have any holes or blowby in your exhaust system. You don't want any sparks or old exhaust air going back through the carb or intake. Dave; I hope I have given you a clearer picture of this contraption, but if you are still puzzled post back! Good luck!
| 
