650ss mufflers

Hello,

I have been the proud owner of a 1965 650ss for about ten years. A few months ago I purchased new mufflers from Armour.
They are very beautiful, but they sound frankly crappy and they are very restrictive.
There si a baffle inside and I believe the gas flow is not good. I have drilled the baffle with à 32 mm stepped drill bit and the engine pushes harder now but I still don't like their sound.
I am very disappointed because I love the sound of this engine and I no longer recognize my motorcycle.

Has anyone tried the mufflers sold by Feked?

They look good and true to the originals.

Ya caint put baffeld mufflers onna SS , omigowd .

Should be GLASS PACK Striagh Thru , or theyre not the real deal .
Early P R's ranem too .



With the correct perforated tube , once the glass falls out , if you jettem rich , they go incandescent W.F.O. and afterburn the charge ,
enhanceing the Kadance efficency .

All Commandos were thus , pre 72 and pinko fed leftest strangulation . Thats why youre chokeing ! Gotta lettit b r e a t h e .
The little ' mutes ' they slammed in the end , is why they twittered . Avionicly not electroniclly ! sendem BACK . unless . . ,

youve got a big long 2 in drill bit , or are pretty good with a gas torch .



SO , clear through unbaffled Glass - Pac , Reqd . As Per P. R. etc .
or youll throw your jetting out . And be at the mercy of every
Bonneville on the road . pre nancey ones .

Gold star mufflers were period mod. on many ' specials ' .



Supose someone'd try baffling themtoo .

Never had original mufflers on any Norton. In the sixties I replaced the straight pipes on my Dommie with Dunstall silencers. No noticable loss of power or speed. But didn't have to outpace the cops.
Off topic: Replaced the aftermarket muffler with an original spiral baffle muffler on the Vincent. Top speed increased 10Mph but now very loud.

What is Kadance efficency"?

Andover sells some too. Don't know if straight through or who makes them for Andover.

I have these Armours silencers on both my 650ss & '68 Commando. I was at Pete Lovells a few years ago on the Commando & he told me it didn't sound right. He peered down the silencer with a torch, then went off to get a length of steel bar, which he then rammed down the silencers to remove the baffle plate. They sounded much nicer after that! When I got home I did the same to the 650ss. Sorted!

Martyn.

I have a set of AN peashooters on my 850. They have the three row of punched clams. They are loud. Recently they sell quieter silencers, have not heard them and no idea if they affect performance or not.
Also have a set of Armour's megaphone type (actually 71-72 model year) on my Trident. They are exactly as the photo in previous post, straight through absorption. They are loud. Stock looking on my Series 2 Interceptor, exact same interals and they too are
loud, too loud. I suspect it is one size fits all more about cost than originality. Annoying that nobody makes stock exhaust.

Ok, thank you for your advices, I'll do exactly the same thing. Total removal of what remains of the baffle. A friend of mine who owns originals told me that there is no chicane inside.

Stephen Hill said:

What is Kadance efficency"?

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Probably what happens 2 hours after a large bowl of chili beans. More air passes out per pulse.

Korekt !

A term for the pulse synchroiseation , they found around the 1950's ??
when you Run One Intake & one exhaust per cylinder .
Like SIX Dual Throat Webers on a real Ferrari , Maserati V-8 with Four ,
or your common garden Shelby Cobra with four webers .



This way , you can balance tennis balls on the Trumpets ,
and watch them bounce up & down while its running .



Ahem ,






Chrysler was pretty much a pioneer in developing it for production auto mobiles .

Tho some others spent some time on induction development .

Figure 1. Variation in Magnitude and Position of Volumetric Efficiency Peaks with Different Intake Pipe Lengths


As you also get this with Exhaust ( Dia / Length ) you can loose half the power potential if your pisspotical .
Find a easy 500 / 1000 rpm's when its somewhere about right , as it cant be right all the time , it's still suck
it and see .

But the IDEA is to get a Shot into the Cylinder , and have the cylinder clear when it get there . Essentially like
the tooned pipes on the ring dings . Olde ot rod trick was crayon or paint line down the pipes , at PULSE
LENGTH it would burn off the decoration , so , if you went two lengths , youd done better , three & youd won.
Four Lenghths and you were in heaven . But likely six foot aft of the rear bumper ! .

A similiem is try throwing a bucket of water down a pipe . ( Hint : a big pipe helps )

Now if the bucketfull whacks out the other end , in one hit , theres a sudden pressure thingo , if that return shock wave
thuds into the valve as its hit ' SHUT ' the big suck in the pipe beforehand has pulled the cylinder clear off leftovers ,
SO ;
The Shock Wave in the INTAKe can now Howl Though unimpeeded. Rather more vigourously than if it wernt like that .
Therefore it'd just sound like one of those old XL Honda trail bikes .

When its working right , it should sound something like THIS .

I think what we are dealing with more and more is copies of copies of copies there for what is lost is the original spec, I have used 3 sets of the Briturbo equivalents and with each i have had to fettle the baffle to get both performance and sound, I guess that now there is more stringent specs {hoops} that manufacturers have to jump to!

I am familiar with the concept of a tuned intake or manifold.
Just never heard the phrase "Kadance efficency".
If you google it, nothing comes up, except a few reference to cadence and bicycle pedalling.

Might be an 'A 'missing , - Kaaden - or maybe theres another tecnical paraphrase that is more pertinant .
Whatever , I think its underlooked in comparison to the two strokes , in 'performance enhancement ' . or
what some od us regard as 'efficency '.

This pair of 650ss silencers came from Armours via Walridge Motors. The invoice says "open type"
Seems right

Sounds good to me , had to ride my 650SS to work today, thought the clutch was slipping but it was just bogging down in the mud in the yard from all the rain.
My silencers are not the best finished but they do sound good, the finish I am not happy with is on the outlet end, I bought them from another 650SS owner sight unseen.
I currently have an exhaust system for a 1951 TR5 Triumph on order from Armours, but they are a bit slow in replying , so do not know if they are coming or not?
Worntorn the 650SS's do run well, only wished I had the money to buy one when they first came out, only had to look and oggle at them.
Kadence efficiency is complicated from memory from engineering days, it involves a whole heap of stuff exhaust/inlet temperatures, noise pulses plus other a lot more, what I think surpasses what we near morals could expect to work out.
Burgs

The 650ss is the motorcycle equivalent of a 340 Duster. That might not mean much to our UK members.
The UK auto equivalent might be the original Mini Cooper S.
That might be a better comparison than the Duster. Both the Cooper and the 650ss have better than average handling as well as surprising acceleration.
They really shouldn't accelerate all that quickly, but they do.
For a real shock try riding a 600cc Norton Model 99 back to back with a 650ss.
You will be forever in awe of Doug Hele!


Glen

worntorn said:

For a real shock try riding a 600cc Norton Model 99 back to back with a 650ss.
You will be forever in awe of Doug Hele!


Glen

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Never rode a 650 but I can say after riding my 99 then getting on the Atlas, the 99 is quite anemic.

Scott

worntorn said:

The 650ss is the motorcycle equivalent of a 340 Duster.

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Such a sleeper car, a Duster. Looks like a car for an old lady in a bonnet driving an old man in a hat from a distance. But, not the 340 or 360.