« Reply #3 on: February 18, 2010, 07:34:41 PM »
The early Goggo exhaust looks to have been developed from the Goggo Roller system used with the Ilo engines. Since the Goggomobil engine is pretty much a twin Ilo this makes a certain amount of sense. As such it featured twin boxes with the heater on one manifold and a long exhaust mounting bar. These systems are quite rare for obvious reasons. Quite why this was changed in favour of the all in one system I am not sure but the quoted reason was to comply with new German regulations. Anyway the all in one system does cramp the Goggo's style for two reasons.
It weighs a lot and is right at the rear of the car thus increasing the rearward centre of balance effecting handling, not the Goggo's strong point to start with on swing axles.
It tends to strangle the engine. A test on my T300 showed that putting on the earlier system allowed the car to rev passed 60 MPH (Goggo speedo) and cruise happily at 65 MPH all day. This car had Coupe primary drive. With the standard system it was a real struggle to get it over 60 MPH. In the twin box form it would out perform a standard Messerschmitt much of the time.
The Lloyd exhaust using the stub pipe from a VW beetle is a happy compromise as it is cheaper and performes better. It is mildly tunable as the outlet is adjustable but as it uses only one outlet of the standard manifold, thus keeping the heater, it is not ever possible to have both cylinders running on the same length of exhaust pipe. I assume this is what is being called the lightweight silencer though I am aware of another design about which I have not tried.
The Goggomobil is very de-tuned and John Bannell is exploring the outer limits of possibility but without doubt the exhaust is a target to alter. However it is not an easy location to fit something really hoopey.
A twin exhaust Goggomobil does sound very much better and can imitate a Tiger in the dark, which can be fun.
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