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Old 06-04-2008, 04:44 PM   #16
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my neighbors love us we decide to break engines in the night before the race at about 11:30 pm by the time we are done it is 2:30 am and those murnan moded rb xenon's are loud ecspecialy with the 2013 pipe
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Old 06-04-2008, 07:13 PM   #17
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I might try the coke bottle idea too.

I love my engine run in stand but I think one day my neighbours are gonna kill me.
If the noise is getting on my nerves and I wear ear plugs , I can just imagine what the neighbours are thinking.

and as for the guy who runs in engines at midnight, I love my nitro engines but I would kill you

Keep the ideas rolling in guys
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Old 06-05-2008, 05:22 AM   #18
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Quote:
Originally Posted by GHETTOTEACHER View Post
You got my curiousty!
Do you mean insert the stinger from the pipe into the coke bottle? I want to try this!
Yes the stinger make the hole in the coke bottle larger so no melting happens!
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Old 06-05-2008, 05:23 AM   #19
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Originally Posted by avs View Post
curious, i had assumed the primary noise source was intake roar. So did you notice what they did for the intake side? was there an INS box or?
No ins just regular air filter !
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Old 06-05-2008, 05:24 AM   #20
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it occurs to me an added benefit of the coke bottle is it collects the large amount fuel and oil that spews from the exhaust.
Exactly that was another good point of this method!
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Old 06-05-2008, 09:35 PM   #21
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tried it tonight with a 29 oz bottle and it melted when I was breaking it in. I am going to build a metal muffler - noise reduction box at work this week. I will post details after I get it designed.
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Old 06-05-2008, 09:55 PM   #22
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How about putting a pipe reducer on one of
new-style low db lawn mower mufflers. You
could make a bracket to hold it in place on the
stand.
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Old 06-05-2008, 10:08 PM   #23
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I just use fuel line(auto fuel line 3/8ths I believe). 20' should do it. Put it on the stinger and run it under the garage door and there you go. This is my method.

My neighbors don't even know when I break one in. Other wise I just stop by the off-road track(out in BFE & no ones there) and do a wide open throttle break-in.
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Old 06-05-2008, 10:12 PM   #24
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Quote:
Originally Posted by rageworks View Post
How about putting a pipe reducer on one of
new-style low db lawn mower mufflers. You
could make a bracket to hold it in place on the
stand.
that is a pretty good idea, I might try that.
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Old 06-06-2008, 12:35 PM   #25
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The only true way to silence the bench is what I have done and it is not a complete problem solver but it helps.

By using a wooden prop or plastic composite you have to file the angle of the prop a bit, as well as cut the notch out for the carb. By changing the pitch of the blade you reduce the noise that it makes. The noise of the blade by far is much worse than the pipe.

When removing material from the prop dont take off to much do a little at a time..
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Old 06-06-2008, 11:07 PM   #26
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Ear Plugs?
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Old 06-07-2008, 12:44 PM   #27
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Ive made a airfilter neck that sits on teh side of the motor with a buggy air filter and use a garden hose pipe about 4/5 meters long that goes into a 2 liter Coke bottle and placed on the side of my garage entrance on teh outside. Ive used a piece of high temp hydrolic pipe as a adaptor for hose to fit the stinger.
It makes a huge difference in noise.
I actually tried a 5 liter plastic container that made more noise than the 2 Coke bottle
Never had complaints.
Got the tip from a buddy in Cape Town who runs engines in for club members.
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Old 06-09-2008, 09:31 AM   #28
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Buy land in the country and Break in all the motors you want !

later
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