14-04-2019, 06:48 PM
Since my last post on Slippery Anne, I have made some progress with her over the last few weeks, The manifold and exhaust is now finished, but awaiting paint, I really have no idea what to finish it with or if any particular colour was used back in the 20s.
I shaped the silencer out of mild steel and made it to the same dimensions I extracted from the period pictures, but, deviated from the baffle box approach, instead using a perforated tube and acoustic filling, which, if my sums are correct should enable the car to pass environmental scrutineering. The silencer input pipe is 1 3/4", which I think is correct to period, but, unlike the Brooklands rules exhaust used back in the day, I have increased the output pipe to also be 1 3/4" and finished it with a fish tail which has a nice big slot.
Another deviation from original is the mounting against the body. The original 1925 design was a simple clamp around the exhaust pipe which was hard mounted to the body, I have made a period looking mount with springs acting as a clamp to allow for body/chassis flex.
To attach it in the short term, I have gone for a simple flange to join the system up at the manifold, but, in the long term I intend to try and fabricate a more original settup using a large nut, which I assume was some sort of compression fitting!?
Regards, Mark.
I shaped the silencer out of mild steel and made it to the same dimensions I extracted from the period pictures, but, deviated from the baffle box approach, instead using a perforated tube and acoustic filling, which, if my sums are correct should enable the car to pass environmental scrutineering. The silencer input pipe is 1 3/4", which I think is correct to period, but, unlike the Brooklands rules exhaust used back in the day, I have increased the output pipe to also be 1 3/4" and finished it with a fish tail which has a nice big slot.
Another deviation from original is the mounting against the body. The original 1925 design was a simple clamp around the exhaust pipe which was hard mounted to the body, I have made a period looking mount with springs acting as a clamp to allow for body/chassis flex.
To attach it in the short term, I have gone for a simple flange to join the system up at the manifold, but, in the long term I intend to try and fabricate a more original settup using a large nut, which I assume was some sort of compression fitting!?
Regards, Mark.