I have this problem with routing the exhaust on my 40 ford on the drivers side. I have the 7 inch master power brake booster under floor and that's right where the exhaust wants to go! I built a simple routing but it is under the frame I could use some ideals around this problem. I've attached a few pictures to give an ideal what I got going on here. Where the muffler sits is where the running boards attach but that is not a problem the depth has me concerned. Fire away!
that looks to me like it will be a liitle low , and you might have a problem with the muffler dragging....i sugest rerouting your brake lines and making a pipe to go around the master cylinder and through a new hole cut in the outer part of the crossmember brace..you may need to buy some tight radius mandrel bends to fab it the bottom lip of the crossmember brace is 6-1/2" from the ground in my `36....an exhaust going under it would be too low
I was thinking about that but a little concerned with the heat but could rap that section with pipe wrap and a cover. I would still be under the booster though but not as low as the muffler.
40 fords are tough.. I have my pipes out under the runningboards.. i am using a truck rams horn with a 90 degree bend coming off the manifold (shooting to the outside of the car, and then another 90 shooting toward the rear of the car.. the "side pipes" then dump just ahead of the rear fender.. I dont really like it but my rear suspension system dictates this solution.. another consideration is the heat your going to be throwing up into the car.. you may want to insulate the BOTTOM side of the car with heat shield to help out.. sawzall
Here's a couple of shots showing how I did mine last winter. I have fenderwell headers and no brake booster so it's a little different than yours, but maybe this will kick off some useful ideas. Previously, I had a setup like sawzall's, but I thought it was too loud. I built this system from mandrel bends and brought the pipes from the headers, under the frame towards the front where it rises over the front axle. It runs through the frame next the the master cylinder and out the back over the axle. I think the key is to have some pretty rigid hangers close to where the pipes pass through the frame to keep it from rubbing, but not very many hangers so the whole system is kind of flexible. I have 2 hangers per side and may add one more per side when I do the tips. On with the pics (please ignore the 2x4 and coat hangers ): Under the front seat looking forward - Under the back seat looking forward - ...under the gas tank looking forward to show the mufflers... ...and a side shot with the camera on the floor so you can see how much it hangs down - Maybe you can have yours run down and to the outside of your booster before you head up and into the frame? Chris
Chris thanks for the pics That could help me a lot! I will still need to sneek around that first cross member though. A little pipe under the frame there should be okay for clearence. What type of mufflers are those?
Yeah, just minimize how far and how much it's hanging down. I'm above the wishbones and bellhousing on mine and I think you should be able to get there even with that booster in the way. Do you have a convertible frame with the extra crossmember under the cowl? None of the other frames had that feature, as far as I know. Is it possible to put a hole in it for the exhaust to pass through? I have Thrush Turbo Tube mufflers. They're similar to the mufflers that GM put on their performance cars in the 60's. I'm not sure whether they're still available. Summit listed them a few years ago, but don't any more. Chris
Chris, I have three members at the tranny mount unfortunately the booster blocks the opening in the first one so I would have to go under than up on the inner side of the master then through the back two members. I think if I can bend the brakelines to hug the master without restricting them the pipe will sneak past the master cylinder.
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