[nasirkaka]

My understanding of the types of goldie available is as follows:

[bludhemn]

Very nice explanation. Thank you. So a goldie with a conical baffle is not completely free flow. I thought that since it doesn't have any wool inside it would let exhaust gases flow without hindrance.

[ricky_1605]

Ok i am a little confused here. As far as i remember my silencer is like the one shown in pic 1 except it does not have the perforated tube. I think mine has a tube but it is a solid tube and not with perforations. Still i will check to confirm.

[nasirkaka]

I guess compared to OEM pipe, all the varients of Goldie would be free flow.

But compared between them, glass wool type would be more restrictive then conical baffle, or so it appears. mostly we opt for goldie to get a good thump, ( unless someone is in to tracks), and for a good thump, the glass wool is suppose to be best, as the wool absorbs high frequency sound/vibrations, releasing only the low frequency ones resulting in meaty and clean thump.

Things to keep in mid are the diameter of the inner perforated tube and diameter of rear cap, with respect to whether it will be mounted on the 350 or 500 cc. Also, whats to be kept in mind is the amount of glass wool thats filled.

Different small workshops/compnays makes these silencers in various parts of india, but they differ from each other as the above mentioned diameter of the inner tube, outer tube and its angular gradient, end cap diameter, wool quantity and length of pipe.

Not sure if anyone is able to crack the above and get a standard values for 350 and 500 varient.

Ok i am a little confused here. As far as i remember my silencer is like the one shown in pic 1 except it does not have the perforated tube. I think mine has a tube but it is a solid tube and not with perforations. Still i will check to confirm.

Has to be perforated or else the galss wool become redundant. Do have a closer look.

[Rennjit]

Originally Posted by nasirkaka

I guess compared to OEM pipe, all the varients of Goldie would be free flow.
.....

Thnx for those pics. as you said all shown are more of free flow types considering the straight-through central passage. OE silencers mostly have the bottle divided into three compartments through which the gas zig-zags. sorry i have no pics. Seems like a transplant/ replicating inner baffle assy from OE is the only option left to get a baffled low-noise goldie.

Originally Posted by ricky_1605

... I think mine has a tube but it is a solid tube and not with perforations. Still i will check to confirm...

could you pls see that its straight-through or not?.

[sans]

Originally Posted by nasirkaka

My understanding of the types of goldie available is as follows:

Hi nasirkaka
I have been keeping myself very busy as I am about to launch my website Sans Classic Parts on 5th march.

I will reply to all the queries probably by this weekend.
Goldstar by Sans Inc. is like the 2nd pic except the glasswool part.

[ricky_1605]

Originally Posted by Rennjit

could you pls see that its straight-through or not?.

I cannot see if its straight through because mine is upswept.

[Rennjit]

^ when pipe is off the bike, inserting something like a thin long metal rod & see if it comes out at other end at proportional length of pipe can point if its a straight through.

[sans]

Originally Posted by nasirkaka

Hey Sans,

I had bought a goldie from shakeel of pune for my machismo 350. That goldie had conicle baffle inside and NO glasswool. It use to sound LOUD on my machismo.

Then i got my C5. I thought of modifying my machismos goldie to fit my Classic 500. Took the silencer to a local fabricator, chopped the rear end of the silencer. Reomoved the Perforated sheet metal baffle. Got a perforated metal tube made, and welded it inside the goldie, leaving a gap of about 20mm between the outer silencer metal and the perforated inner metal tube. Filled the gap with glasswool, got a separate cap fabricated and screwed it in place.

Went for a LONG ride after that covering 2000kms, riding hard. Sound was meaty, bassy and loud.

came back rode in city for another 1000 kms. Then decided to get the silencer chromed. Had to Removed the glass wool before chroming and was plesently surpsided to see most of the galss wool was not burnt, even after 3000 odd kms.

All in all, exhaust note preference is personal, and would vary from people to people. so guys, try out different options, do some r&D and with little effort, i am sure you would be able to achieve a note very close to what you expect.

Hi nasirkaka
First of all ,I would appreciate the pains u took to get that lovely thump you have been wishing for.
Its true that the burning of glasswool is not a normal phenomenon.However,a few have observed that due to wrong carb tuning.
people usually are not that passionate towards the thump and need quick solutions.
We ,at Sans Inc. manufacture exhaust that are direct fit and do not require much hassles on fitting.
We use perforated conical tubes and no glasswool.Our exhaust produces
a mellow and meaty thump without glasswool too.
And once the carbon deposits settle in ,the results are amazing.

[sans]

Originally Posted by bludhemn

If there's no glass wool, then isn't it a free flow exhaust? Can glass wool be placed inside the baffles?

The Baffles are of long lengths of 9 inches and 6 inches.They produce a heavy thump and for that no Glasswool is required.
Also ,its a closed exhaust ,so glasswool can't be fitted.
Please find below a pic of Goldstar by Sans Inc, with Conical baffles.

[sans]

Originally Posted by bludhemn

Very nice explanation. Thank you. So a goldie with a conical baffle is not completely free flow. I thought that since it doesn't have any wool inside it would let exhaust gases flow without hindrance.

hi bludhemn
yes,its true that Goldy with conical baffles is not completely free flow.
The Long perforated tubes itself act as hindrances.
Also ,its safe for your engine too as its able to create enough back pressure.

[ricky_1605]

Originally Posted by Rennjit

^ when pipe is off the bike, inserting something like a thin long metal rod & see if it comes out at other end at proportional length of pipe can point if its a straight through.

Got to know that my goldie is not a free flow, today i tried inserting a long screw driver and it got stuck somewhere in between.

[nasirkaka]

@ Saurabh aka Sans:

Hey mate, Now that you are manufacturing and supplying the goldies, how about introducing one with the glass wool option also. Would be nice to give customers the option of choosing between the glasswool type and the conicle baffle type. I do understand that making the galsswool type may be a bit more complicated, but you could price at accordingly.

As you rightly said that most of the bull owners are looking at a quick-fix solution to a louder thump and the range which u have suits them best. But being in the business of silencers, i am sure you do understand the difference in the thump from a glass-wool. I have experienced both of them, and a conical baffle would never absorb the high-frequency sound waves, as well as glass-wool would.
If possible, please introduce glasswool type silencers as well in your product range, and i am sure there would be a lot of takers for it.

Also, i read somewhere that there is a formula to calculate the diameter of the end tube and this would differ for various engine capacity. Therefore, a goldie made for 350cc engine may not suit 500cc engine. I am not sure, but if you could do some research on this, and introduce appropriate silencers for 350 and 500, it would be great.

Thanks.

[Karlitoz]

Nasirkaka,
I think looking at your pictures, the entire information cloud regarding types of Goldies is clear. But my question is what do you think is better for the engine ? A glass wool based or Conical baffle one ? I have a Mach 500, which currently has a glass wool Goldie. But after reading this post, and hearing from a few others, I want to go in for a conical baffle one.
Would you suggest this change ?
Ride proud...ride safe
G

[Leepower]

What I need to understand is how do you make the necessary adjustments in Classic 500 which has EFI after plonking in a goldie???
In normal Cast Iron Bulls, you have do upjetting and some even put a bigger carb.
What are the changes you have to do in Classic 500???