Author Topic: Motorcycle Variable Exhaust System - PLEASE READ - Student in need of Feedback  (Read 918 times)

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Offline Lammers000

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Hello all, I'm currently in an Engineering Entrepreneurship class and am developing a variable motorcycle exhaust system and need some "consumer feedback" as part of my team's research portion. Please take a look at the follow questions and fire away with responses! Please number your answers so I know which question you're referring. Thanks guys and gals!

1. Would having a variable muffling system be of interest to you?

2. Have you ever sought out a variable exhaust system? If so, what system?

3. What are existing products on the market lacking?

4. What features would you like to see incorporated into an aftermarket variable exhaust system?

5. Instead of loud/quiet settings, would you like a range of sound levels?

6. How much would you be willing to pay for a system like this?

7. Would you be able to install the system yourself?

8. Would you prefer a system that's integrated into your bikes electronics or a standalone system?
    (A standalone system would be cheaper and would be easier to install)

9. Do you think "Loud pipes save lives?"

10. Do you think the idea of a variable system is practical?

11. Does anything about the idea concern you?

12. Do you have a preference on how to adjust the system (manually, via hand control, by foot, electronically)?

13. Does the size of the muffler concern you for ergonomic or aesthetic reasons?

14. Do you prefer a cheaper but less functional system or more costly and more advanced system?
Be an Engineer they said. It will be fun they said.

Offline Dunk

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1. Would having a variable muffling system be of interest to you?
You need to defined "variable muffling system". I f you mean like cutouts, changing/removing packing/baffles, or SuperTrapps... Then it is not a big interest to me. I like being able to swap a quiet baffle for a loud one but in practice when I've had the option I never bothered, just set up my exhaust for quiet to moderate noise levels, avoiding being obnoxious.

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2. Have you ever sought out a variable exhaust system? If so, what system?
No. I have experience with SuperTrapp systems. That is how I got them and they were adequate.

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3. What are existing products on the market lacking?
Nothing comes to mind.

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4. What features would you like to see incorporated into an aftermarket variable exhaust system?
N/A

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5. Instead of loud/quiet settings, would you like a range of sound levels?
SuperTrapp offers this via different packing, disc, cap config. Edit after seeing you mean dynamic while riding: Two levels would be fine. Open pipe/dump for lower speeds in traffic and a non obnoxious sound level for higher speeds, no traffic, night around neighborhoods, etc.

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6. How much would you be willing to pay for a system like this?
Would have to be comparable to a nice pipe or muffler with removable/changeable baffle. For chrome or stainless, $300-$600 maybe?

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7. Would you be able to install the system yourself?
Yes.

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8. Would you prefer a system that's integrated into your bikes electronics or a standalone system?
    (A standalone system would be cheaper and would be easier to install)
None of my bikes have any electronics aside from charging/ignition/lights. I would not like any electronic control or motor.

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9. Do you think "Loud pipes save lives?"
At low speeds, yes I believe there is the potential to be heard by drivers in a position to pose a threat who are too selfish to open their eyes. If I had an open pipe I may have been heard before I was hit this year, I sure was not seen. My pipe is fairly quiet at lower speed and load, but having a totally open exhaust at low speeds in traffic could be a life saver.

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10. Do you think the idea of a variable system is practical?
I'm thinking you may be talking about a dynamically (while riding/driving) variable system. Is which case it is not practical. Government has outlawed these types of systems all over the country. Cable or solenoid operated cutouts are illegal in cars here. Must have bolted on caps. Captains call exhaust is illegal in many areas too and you will be fined even if you've been running through the prop all day. Anything adjustable while operating the vehicle will be an uphill legal battle. Others may keep it hidden or out of plain sight and try to stay under the radar, but I prefer to keep government out of my life so would not purchase a dynamically adjustable system if it was illegal for road use in any places I travel.

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11. Does anything about the idea concern you?
Government.

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12. Do you have a preference on how to adjust the system (manually, via hand control, by foot, electronically)?
Cable or lever easily accessible but hidden, perhaps under the tank/air box/etc.

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13. Does the size of the muffler concern you for ergonomic or aesthetic reasons?
Yes, should appear period correct on the bike and retain use of center stand.

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14. Do you prefer a cheaper but less functional system or more costly and more advanced system?
Not sure what functionality would be lost with a cheaper system, or what is more advanced about a more advanced system. Generally I take a simple is reliable is beautiful view towards most things.

Offline flybox1

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This is more of a modern bike feature....with the electronics needed to maintain A/F mixture when volume/flow/back pressure change.

The 'stock' bike guys probably wont event think about it.  Desecrating a good set of original 4:4's for a doohickey to change that awesome sound?  NEVER!  >:(

For the rest of us, the cost probably isn't worth the benefit, even on a 4:1 system. 
For ~ $100 you can get a cone engineering muffler, baffled or not, to suit your (volume) need, and only have to tune it once.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline strynboen

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    • http://forums.sohc4.net/index.php?PHPSESSID=t94c6njgm7v35if6icin7ieqr6&/topic,60973.0.html
2 stroke have used variabel exh ports for years..to finetune the back pressure in the exhost champers..its only for performance not komfort /fun..
Suzuki used a airmix for better kooling of the pipes on the vankel engined bikes..it vas a airintake ,,worked as a ram air intake..(person i think it vas to thin the thik smoke... they used 2 stroke oil to lube)..so heavy smoke vas a problem
but on 4 stroke..a simpel system for laud pipes is the dubbel valled tube..vho the autside tube can be moved/turned...and open pasage for drilled ports in the inner tube.  .but it are most a Harley fix...

i kan not speak english/but trying!!
http://forums.sohc4.net/index.php?topic=60973.0
http://forums.sohc4.net/index.php?topic=144758.0
i hate all this v-w.... vords

Offline evanphi

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You mean like a butterfly bypass valve?

Nice concept... but not practical on a consumer motorcycle. You'd need two mufflers build into one, and the butterfly would shut off the "quiet side" and redirect to the "loud side". A lot of extra weight for such a useless feature (IMO).

It would be practical for racing applications where more backpressure, etc. would be needed for increased performance in a 4-1 setup, but that would all be controlled by an ECU anyway. Pressure switches, A/F meters, etc. etc. etc...

Just buy the exhaust system that suits most of your riding style, and if you need to be quiet, keep your revs down!
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive