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Exhaust

2K views 15 replies 11 participants last post by  BMF 
#1 ·
What exhausts are the best for a real good throaty sound for a 1975 T140V . Louder the better.
 
#2 · (Edited)
Hi and welcome to this forum, you need to put your location in your profile for others to help with parts in your area. Anyway, the short megaphones often sold on ebay that need spacers to make up the gap in pipe diameter,are extremely loud. By far the loudest silencers i ever used on my T120r. Cost is under £100 a pair. I often find them at £35 each at the autojumbles in the UK. There are no baffles but they have an absorbtion tube running through and a spark arrestor. They often sound louder on the overun than when under power. Might get a bit fatiguing if used at over 70 mph for longish periods.
 

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#4 · (Edited)
Hi John
I have two sets of original Anglo bike brand end pipes, one set straight and one set upswept— I was going to call them silencers, but I would be lying.
Anglo bike really knew how to make a T140 shift, so not only are they extremely anti social, they are also at tuned length and taper, very free flowing.
Rare and wonderful but they even piss me off after 150-200 miles.0::smile2:
They are pretty tatty now and I have been toying with the idea of getting a batch of them copied in stainless steel.
Please be aware that if you change your exhausts, that you might have to retune your carburettors on all 4 internal fuel delivery paths
.

Regards
Peg.
 

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#5 ·
Go 1 3/4", no balance pipe, and taper turbo's, they are loud enough that the garage I had it rego checked at did...but didn't want to give me a roadworthy. Coming down the street under full throttle and riding it hot into the garage almost sideways didn't help. The owner came out, looked, and just shook his head lmao.

He just said "You went home and put those pipes on after I did this OK".



One thing I like about shorter mufflers is they don't get in the way when you have to take the back wheel off.
 
#8 ·
Agree about the Anglobike pipes
I have upswept ones and my bike had the longer ones fitted when I bought it from Anglobike many years ago.
They were up the road from me.

I also thought of finding a maker to replicate them in stainless
Let me know if you ever go ahead.
 
#9 ·
Hi Dave,
Your neighbours have my deepest sympathies >:)

I knew you hade a tuned Bonnie, but didn’t know it was tuned by Pete Frost. He really knew how to unleash the horses.

I have the upswepts in the photo and a pair of straight pipes that I grafted on to my Morini, but I believe they are the shorter pipes.
Do you still have the longer pipes, if so can you measure them, or, do you have a photo.

I think it might be worthwhile to get these pipes copied in a batch.


Does anyone on the forum know of a quality bespoke exhaust manufacturer that they can recommend.


Regards
Peg.
 
#10 · (Edited)
Reverse cones may well be worth a try. By that I mean proper ones.

https://www.classicbikeshop.co.uk/alloy-ended-megaphone-silencer-38mm.html

There are loads of lookalikes that don't do the business. I've wasted megatons of money trying them.
Most will stifle your bike such that you will struggle against family saloons.

You can easily feel the difference between an engine which just loves to rev (that's a Triumph) and one that struggles to get beyond 5000rpm.

I've used original type megaton silencers for many years on my T120 (apart from the mistakes with the lookalikes).
They are quite loud, but the quality of the sound is enjoyed by most folk. The burble on closed throttle is distinctive.

Don't fret overly about megaphonitis, it won't happen on your ordinarily tuned bike. Just try the real megas and see what happens!
 
#13 ·
Hi,
I’m afraid it’s you Trident, plays fine for me.

Rambo, there is something primeval about you, your lust for life is irrepressible and brilliant.

I have used Norton Commando style peashooters, they always looked stylish on a Triumph. They have a deeper sound than the standard T140 pipes, but are still quite civilised. They work on a gas disruption system to quell the noise. Inside the central tube of the silencer there is a series of flutes directed into the gas path, these pick up the gas in some flutes and force it out of others as the gas pulse passes through, the currents caused break up the pulse so reducing the noise.
If you wish to alter the sound, you can flatten the flutes one by one. The more you flatten the louder the pipes become, between 50-75% produces a silencer that is reasonable while pottering about, but very antisocial under hard load. The exhaust is less restrictive, so carb tuning might be needed afterwards.
Once the flutes are flattened there is no going back, so do a little at a time until you are happy, then stop.
I have used a scaffold pole of a suitable diameter to hammer down the silencer to flatten these down, it is a bit of a brutal process.

Regards
Peg.
Sorry about the use of the ‘N’ word, no offence intended

Commando peashooter flutes.
 

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#15 ·
i think length and diameter makes an interesting difference. my morgo commuter goes 114 with an old alphabet 1.5-inch 2-into-1 on it with all the fibrglas blown out.

but if i swap in stock 1.5-inch x 38-inch paired pipes with a 17-inch reverse cone megaphone and bump the mains two sizes from 220 to 240, it has gone 117.

and it's much louder. lol

my son says he can hear me coming home through the canyon two miles off
 
#16 ·
I'm a bit of a old fart in this sense. I had loud pipes for about 6 months back in the day and took them off the day I realised I the effect it was having on a family across the road with a young child who had a serious illness. I'd urge you to reconsider such loud pipes. I love motorcycling but don't think others should suffer for our hobby. There's a little town where near where I live that's at the top of a lovely mountain climb. Property prices have dropped so low from the disturbances of folks riding through the town (sportbikes early morning, sport cars in late morning and Harleys in the afternoon generally) that the federal government is funding the development of a camera/photo/radar type device to measure and ticket excessive noise emissions. Just my 2c. Please don't take offence.
 
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