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Old 04-28-2017, 04:02 PM   #1
NapaMike   NapaMike is offline
 
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Quiet Performance Muffler

Hawaii is cracking down on loud, modified scooters. I usually install so called 100cc big bore kits and performance exhausts on my son's scooters. Is there a way to have the extra power while keeping the noise down? Can you run a stock muffler on a big bore and still have similar power? What's the solution to this problem? We would like to have the power to climb hills without bogging, while not attracting unwanted, expensive attention.

Any help appreciated

Mike



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Old 04-29-2017, 02:13 PM   #2
Irish   Irish is offline
 
Join Date: Dec 2014
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Do the police have anything to check the noise decibles with? That is the only way to check it. Someone cannot stand next to your scoot & say-That's too loud & give you a ticket for excessive noise. If they do you can have it thrown out in court. Irish
P.S. Court is a pain but if they pass laws they should have the equipment to enforce the laws. Be a "Pain in the ass" & fight for your rights!

Last edited by Irish; 04-29-2017 at 02:21 PM. Reason: Add P.S.
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Old 04-29-2017, 02:53 PM   #3
Roscoe   Roscoe is offline
 
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I see some advertised but I have no idea how much they actually quiet things down, they seem to lower the pitch more than anything which might be enough. I've wondered how Honda generators can be so quiet. You can tune a muffler to certain frequencies to cancel out the noise but it's tough to do over the wide range of scooter engines. Google "acoustics, single cylinder engine" and you'll see what you're up against. I'd probably try a muffler from a 150cc engine (some welding my be required) and see if that does the trick.
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Old 04-30-2017, 10:29 AM   #4
wheelbender6   wheelbender6 is offline
 
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Try using a stock muffler and blue print it a bit. Use a Dremel tool to enlarge the opening at the cylinder.
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Old 05-22-2017, 03:58 PM   #5
Irish   Irish is offline
 
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To the BEST OF MY KNOWLEDGE the only way to increase power is to lower back pressure , thatmeans MORE noise! That's on racing motorcycles. I assume that it works the same but I'm no expert on scooters. Irish

P.S. I used to run straight pipes (with engine tuned to them) at the drag strip but there's NO noise police there!

Last edited by Irish; 05-22-2017 at 04:02 PM. Reason: Add PS.
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Old 07-28-2017, 10:43 PM   #6
Shadowfire   Shadowfire is offline
 
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With a big bore kit, you need something that can flow the exhaust without excessive restriction AND has enough surface area to absorb the sound waves (change them into heat). You just need to do your research before purchasing the muffler. In order to effectively quiet up a higher flow rate, you basically need a bigger muffler section. If the performance muffler has a muffling section of similar volume to the stock muffler, its likely to be louder than the stock pipe.
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