Silent Soviet Airhead

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Mjolinor
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Re: Silent Soviet Airhead

Postby Mjolinor » Mon Aug 12, 2019 10:19 am

Retard the timing. I should have thought of that earlier. Exhaust noise level will increase slightly but engine mechanical knock will drop by more and you can always stuff the exhaust with additional material.

You are only looking for maybe a 60% (10 dB doubling factor on dBa) drop in noise, that makes it seem like not a lot but I still think it is a horrible target to reach. Memory is telling me that 80 dBa is the same as a goods train at 10 metres. (memory could be faulty, it often is)
Failing all then register it in France or whatever other country is closest to where you live.

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CharlieVictor
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Re: Silent Soviet Airhead

Postby CharlieVictor » Mon Aug 12, 2019 12:44 pm

Acquiring an actual residence might be more expensive than the Dnepr... :smile:
1978 BMW R100S "Naked"
1999 W650 RS "Twin with a kick"

Mjolinor
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Re: Silent Soviet Airhead

Postby Mjolinor » Mon Aug 12, 2019 1:32 pm

Acquiring an actual residence might be more expensive than the Dnepr... :smile:
I am not sure about that given how onerous it is looking. :)

krankshaft
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Re: Silent Soviet Airhead

Postby krankshaft » Mon Aug 12, 2019 9:52 pm

Some excellent replies,
Can't believe I hadn't thought of the little rubber blocks between cooling fins, will give it a go,
and timing retard. Every bit helps, although, I'll still have to be sure before I fork out for a retest.
It will have cost me more than I paid for the bike, with the retest.
Mj and john, the test must be carried out with the sidecar mounted.
Thanks again

Mjolinor
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Re: Silent Soviet Airhead

Postby Mjolinor » Tue Aug 13, 2019 12:57 pm

Angled plate on the inside (engine side) of the sidecar to reflect noise from the engine upwards instead of it hitting the sidecar.


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