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how can i reduce 2 stroke engine noise

16 years ago

I JUST PURCHASED A TORO 2450 2 STROKE SNOWBLOWER AND WOULD LIKE TO USE IT IN THE MORNING BEFORE I GO TO WORK (AROUND 6:00 AM) BUT IT IS JUST TO LOUD. IS THERE A WAY OF QUIETING THE ENGINE SUCH AS A ADDITIONAL MUFFLER ATTACHMENT?

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Comments (8)

joecool85
16 years ago
Well, you could try taking the caps lock off.

Other than that there isn't a ton you can do. Depending on the style of the muffler you may be able to make an exhaust diverter and direct the exhaust downward.
joecool85
16 years ago
btw, why can't you run it at 6am? When there it is snowing, people generally understand you gotta clear it out. I've never had anyone compain to me for running the snow blower at 5am even. Now the vacuum cleaner, that's another story.
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Greetings all Some very interesting comments and replies, I am studying motorcycle mechanics atm and there is a question about a 2 stroke engines regarding the blue smoke. From what i gather from all the comments and question i have decided to express my opinion also, to maybe help the problem if i can. I do not know the bike your talking atm so maybe someone with the same bike has more expirienced if it has mechanically involed as well. There is a way of making 2 strok run cleaner but you will get smoke one way or the other, the problem is despite the small amount you may put to the engine to lubricated in order to keep it clean (but not at its best lubrication) it is impossible to do anything other then provide the right amount needed by the engine at full load. inevitable this means that at lower speeds or start up there is an excess of oil which results in oily exhaust and build of carbon, as the others said the problem you have is the build of carbon and in this case that the explaination as to why you get that build of carbon in your engine/exhaust. Something you need to know is wheather your bike has a pre-mix lub system or a pump system. to simplify this a pre-mix means wehater the oil is mixed with the petrol before getting to the chamber or having a pump will either injected directly. You can easily find that in ur manual or by checking the throtle. a pump will be connected to the throttle were a separeteing wire will be used for the throtle and the pump. this is important because of the ration, the pre-mix has a ratio of 20:1 to 50:1depending on the engine and the oil used. a pump has 100:1 at idle speed and 20: at full throtle. I hope you can see from the ratio the different in oil use, but always check the oil by the manufacter and the engine itself obiously. Having said that using the wrong oil will cause smoke. carbon in the piston will cause smoke. having setted the throttle, pump incorrected, such as smaller wire, will cause smoke. Richer mix will cause smoke. But at this case all you need to do is check weather u have pre-mix lub or pump then check you are using the right oil and then check the mixture is right, by adjasting the carb, then clean the ex port as the other said. and then check the bike to see if its better. if not open the engine up, its shouldnt be a problem with the right tools and you using the manual and then check the piston for carb. I hope this answer some of your questions, it wont take you long to do it and i hope good luck to you. Please as i said i am a motorbike mechanic studen so any comments are approciated
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@opaone: your numbers, while still higher than my estimates, are at least within an order of magnitude, which in this business probably is reasonable correlation. I agree that this could rise to a significant concern with 10 people really cranking away in a poorly ventilated room. So we're on the same wavelength. @spurpura: you are correct in that I've not invested in air quality monitoring devices or hired PhD's to test my house. But my calculations are grounded in simple physics. The only assumption I have made is in the estimate of CO2 production during exercise, and that was from an academic sports physiology laboratory, authored by a PhD and published in a peer-reviewed journal. If you have figures showing that CO2 production during exercise is roughly 10 times higher than my estimate (which is what would be needed to support your observations), I'll await the citation. There are really only three possible scenarios: You are measuring local concentrations of CO2, presumably close to where you are exhaling. Your PhD consultants and their equipment are wrong. There's an exogenous unidentified source of CO2 infiltrating your exercise room. Enough of that dead end discussion. But...as to your original question, I think you're on the right track. As noted upthread, our 1200 cfm hood runs through a straight run of 10" duct, about 25' upwards, with an attic-mounted Fantech LD10 silencer and FKD10XL blower. It measures 60db (LCS weighted, ear level, roughly 4' from baffles) on high. So we hit the mark you are shooting for and I expect your setup will too. Good luck!
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barbedwire
16 years ago
Yup, people in snow country accept that snow removal is going to take place at whatever time necessary........and to those who don`t , don`t worry about them.

You don`t want to add any additional muffling to your engine, it will choke it down on power. Joecool`s idea of a deflector sounds like a good idea as long as it`s not restrictive. You can buy muffler deflectors at good OPE shops that screw or rivet onto your muffler. Just be sure to pull the muffler and get any metal shavings out before running the engine if you do any drilling on it.
stripped_threads
16 years ago
Most of the people on my street have their drivway cleared buy Profesionals. They have great big tractors that remove the snow from a standard drivway in one sweep. They are "oblidged" to clear the snow BEFORE 6 (or something) so the people can drive out and go to work. The noise and flashing yellow lights will wake anything up...Nobody complains, it has to be done.
As for making it quieter, wear ear plugs.
nevada_walrus
16 years ago
Anything you do to the exhaust that doesn't cause a resstriction is going to be so big and bulky it probably wouldn't be practical. Keep in mind there is a substantial volume of noise coming from the carb and snowblowers generally have no air filter to knock down most of it. You might try using a big block of foam that you can stuff into the air box around the carb opening to reduce noise from that source. Filters are not used on snow blowers because they aren't needed and a filter can ice over causing an over rich fuel condition. Any block of foam you stuff in and around the carb needs to be easily and quickly removed in case this happens while running and for removal to allow to dry out when not using.
joecool85
16 years ago
If you decide to go the route of the air filter, you will need to re-tune the carb or it will be running real rich afterwards.
canguy
16 years ago
'Well, you could try taking the caps lock off'
That is funny.
rmh3481
16 years ago
Here is an idea:
First study the current muffler and how it is mounted to the cylinder. After your familiar with the engine, run a search for Radio Controlled boat engine silencers. Many of the larger RC toys use string trimmer, blower or chainsaw engines. Finding a silencer for the exhaust port size shouldnt be that difficult. Another crude method that may work is to take a large Chili Bean can and fit standard flameproof fiberglass insulation into it. You would then mount the bean can over your snow blower engine's muffler. Just make sure there is enough air flow through the can so you dont choke the engine's air flow. You could wire mount the can untill you come up with a permanent solution, or even take it on and off depending upon the time that you want to use it. For sure a tip of the hat to you for being a nice neighbor!

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