Exhaust system....

[Lucky13]

Trying to figure out what the h*ll a Bf 109 with Eberspächer acoustic pipes is.....acoustic pipes on a '109, why, how do/did they work and what do/did the system sound like?

 

[Crimea_River]

Funny, I was doing a search on this on the net [a little project I'm thinking of doing] and came across this unanswered post. I'm possibly going to do a JG 300 Wilde Sau Bf 109 G-6, many of which featured this device and am looking for more detailed info on it. Would love to see some details of it. I have lots of distant pics and profiles but nothing close-up.

 

[razor1uk]

The 'acoustic pipes could refer to the design of the exhaust pipes, to aid cylinder gas extraction on the initial pulse wave, and on the reverse pressure wave, limiting somewhat air fuel leak-out from that cylinder via the taper(-ings) and the length of the exhaust pipe for each cylinder, like a 4 stroke 'megaphone' version of a 2 strokes 'expansion'(-/Kaaden) pipe. While the cams for intake and exhaust have set times and overlaps for efficiencies at a speed, the tuning of the exhaust can fine tune the efficiency for the air heat pumping effects with in pipe.

The reverse pressure ware travels at twice the speed of the primary/initial exhaust pulse wave, but with half the force in an exhaust pipe, if my memory of Phil Irving's writings rings true. I wonder if anyones ever seen some of the crazy megaphonic Kaaden expansion pipe sections of exhausts used in some works rally cars, they make a HRC NSR's pipes look boring.

Or it could be related to the family company, perhaps both? ...perhaps the family business supplied some parts to the Germany air industry during the war?
http://www.eberspaecher.com/
http://en.wikipedia.org/wiki/Helmut_Eberspächer