Lanz Bulldog Muffler

[Grabatire]

With John Deere having aquired Lanz back in 1956, I will risk asking this question on the John Deere site.

Why is the muffler on the Lanz Bulldog and similar type of tractors like the Field Marshal shaped the way it is?

 

[centash]

Tuned exhaust--helps to scavenge the exhaust gasses from the cylinder which in turn, allows intake air to flow more freely. Has to do with Bernoulli's Principle which states, in part, that a fast flowing gas will exert more lateral pressure than a slow moving gas. thus, the exhaust stack allows for varying speed and so pressures of the gases to keep them moving.....I think.

Ben

 

[Geoff Mathews]

Both Lanz and Marshals were loop scavenge engines. They were 2 cycle with the ports at the bottom of the bore. The exhaust travelling through that particular shape helped suck fresh air into the cylinder behind it. Incoming air came through the crankcase where it was compressed before being released into the cylinder. One way valves in the air intake prevented air flowing back out the way it came. Air seals on the main bearings stopped air getting out the sides. I used a Marshall on tracks for about 25 years. It did not go well when the exhaust was not fitted.

 

[Grabatire]

OK guys, sounds good to me.