My son presented me with one of Chaffin's dual exhaust manifolds. They usually require significant modifications to the firewall, steering column base, throttle rod etc to be able to fit them to RHD cars. My Duncan & Fraser roadster has the steering column lowered and moved outwards at the firewall, so everything is much simpler to fit.
We still have to get two pipes past the pedals though. This is how I did that.
The two standard sized pipes are collected in one 2" pipe for the journey to the back
The next problem was getting some clearance under the starter switch. This required reliefs for the switch terminals and the running board supports so the pipe could be lowered under the switch.
I make standard mufflers, so I had ends and shells in stock. The front one was altered to take the 2" pipe and the rear one modified to take a 2" outlet. This means some gas goes from the pipe straight out the back. Some people run without the inner shell, so it should not matter.
All of this was done on a rolling chassis. Now I have to hope it will git the same way on my car.
Allan from down under.
Allan, I would be somewhat concerned about the heat from the pipes on the starter cables.....
Thanks Tony, my son had the same concerns initially. The gap now is 1", a larger gap than that on the standard system at the moment, so it should be OK. All RHD cars have the same set-up and it is not usually a problem.
Allan from down under.
Allan it's all packed in like a sardine can! Really nice work!
Allan -- You might consider getting a pair of Ford tractor mufflers, part number FO-11. I don't know whether they are available down under, but tractor supply-type stores have them here. They are a straight-through glasspack type of muffler, which will create less back pressure and have easier flow than stock T mufflers. And isn't that the reason for using the dual manifold?
Can't say I've ever seen a starter switch base riveted to the frame ! I see it's the "early", screwed together style that was serviceable but still ?
Interesting thread! It had not occurred to me all the differences on the right hand drive vehicles!
Norm
Steve, well spotted. I have never seen another starter switch bracket riveted to the frame either. I suspect this is the restorer's work.
Mike, I prefer the look of original parts as far as possible. I had toyed with the idea of a glass-pack hot dog muffler hidden inside one of my assemblies. The hot dog worked well on my speedster. I will suck it and see first.
Norm, the one blessing in all this is the ease of hooking up a foot feed on RHD cars, just a straight rod from pedal to carb.
Allan from down under.
"I had toyed with the idea of a glass-pack hot dog muffler hidden inside one of my assemblies."
I hadn't thought about doing that, but the FO-11 is smaller than the outer shell of a T muffler, so it should be do-able.