Author Topic: Exhaust pipe  (Read 1188 times)

Offline broom34

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Exhaust pipe
« on: 03.10. 2010 12:00 »
hi Everyone
                         Having just finished rebuilding my A10 plunger and feeling quite pleased with myself when I was interrupted by a local know all, who said that the bike was running to noisy for an A10 therefor I would need new exhaust pipes .
                        Removing the pipes and looking through the centre, I could see straight through with the exception of material linning the inner side of the wall of the pipe and I was wondering  are the inner baffles missing, now I know nothing about exhaust system  therefor could someone please advise me.

Richard
  ]

Offline Stu55Flash

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Re: Exhaust pipe
« Reply #1 on: 03.10. 2010 12:23 »
Hi Richard

I've just fitted a new set of silencers from Armours. They are not exactly straight though - but almost. Looking down the end the bore narrows to about 1 1/4" and there is a drilled gauze type plate angled down wards. Mine is quite loud - reasonable when ticking over but gets loud when revved.

He probably works shifts and is just P***** off because you woke him up. There is a good example on youtube - Don Hall's test of the A10 Golden Flash so you can get an idea of the noise - sorry grunt.

Stu
"Keep a distance from lady "L" drivers in cars. Some are not mechanically minded, are slow to acquire road sense, an are apt to panic..." The Pitman Book of the BSA Twins.
Golden Flash Plunger 1955, Francis Barnett Falcon 67 1954, Ferguson TEA Tractor 1951. Looking for another project!

Offline Goldy

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Re: Exhaust pipe
« Reply #2 on: 03.10. 2010 12:28 »
Your description of the inside sounds exactly right to me. Buy him some ear plugs for Christmas.
56 A10 Golden Flash - Restore, ride, relive.                                          
56 C12 BSA project ongoing

Offline lawnmowerman

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Re: Exhaust pipe
« Reply #3 on: 03.10. 2010 13:48 »
Hi Richard

Looks like you have the standard silencers which you can see straight through. The silencing is achieved by a perforated tube inside the silencer which the gases pass through and some of the noise is absorbed.

I have twin goldies on my SR and they sound awesome, although I do have understanding neighbours - one rides classic trials bikes and one rebuilds Manx Norton engines.

My reaction would be to polish up your silencers and tell your neighbour that you have fitted new ones at great expense following his "advice". Hopefully he will be too embarrased to say they sound exactly the same as the old ones.

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

Too old to Rock and Roll but too young to die  (Jethro Tull 1976)

Offline Beezageezauk

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Re: Exhaust pipe
« Reply #4 on: 03.10. 2010 16:48 »
Hi Richard,

I've got stickers on each of my pannier boxes that state "Loud pipes save lives".

At least folk can hear me coming and if anybody comments on the decibels I refer them to the stickers.

They normally develop a grin at that point and start talking about the availability of spare parts!!

Beezageezauk.




Online bsa-bill

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Re: Exhaust pipe
« Reply #5 on: 03.10. 2010 18:27 »
My 61 Flash had in 61 straight through pipes apart from the small perforated baffle as stated by Stu, however that baffle was important as the standard check by her Majesty's constabulary was to stick a metal ruler up there until it hit something, if it went right up to the exhaust valves you were in for an earful, then a fine.

If you lived close to me I would come around to your neighbours with my Goldie pipes, (they are loud loud, in fact worries me a bit ) guarantee he would appreciate your pipes after
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline broom34

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Re: Exhaust pipe
« Reply #6 on: 04.10. 2010 19:23 »
Hello Everyone
                          I would like to thank all of you that responded to my exhaust  query, you were most helpful and amusing ,thank you.

Richard