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Old 06-04-2008, 11:15 AM   #1
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Default break in bench noise solution

I read on a thread to put a exhaust pipe silicone extender onto the tip of the pipe and put that into a bucket of water to lower the noise level of the break in bench. Does anyone see an issue that this would cause? It sounds like a good idea and If there is no issue there then I will probably try it.
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Old 06-04-2008, 11:22 AM   #2
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Wow never thought of doing that. But not sure what the added pressure felt at the exhaust tip would due to the engine. You would see a slight back pressure with added silcone tubing and what ever pressure added because of the water. It could effect engine rpm's
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Old 06-04-2008, 11:37 AM   #3
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It is done a lot on toyfairs but with a brake in stand and a proppellor it is the prop making noise......
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Old 06-04-2008, 11:43 AM   #4
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I sure wish their was a quiter way to break engines in.. i love using my prop stand but my neighbors aren't overly fond !
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Old 06-04-2008, 11:44 AM   #5
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possible moisture in engine? try a plumbers vacume breaker or your engine could sound like its a yamaha ha ha cheers!
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Old 06-04-2008, 11:55 AM   #6
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you ain't kidding about the noise i had to do two motors over two days i thought somebody was going to kill me with all the noise i was making....
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Old 06-04-2008, 11:56 AM   #7
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i have seen chamebers used after the pipe that reduce noise and no water nesasary i believe they are in all jet ski personal water craft made out of pvc and fiber glass whithout added back pressure! cheers
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Old 06-04-2008, 11:56 AM   #8
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Originally Posted by Roelof View Post
It is done a lot on toyfairs but with a brake in stand and a proppellor it is the prop making noise......
???? can you explain ????

Doug
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Old 06-04-2008, 12:31 PM   #9
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I've seen this done at wintrnats!

get every thing ready to break in start the motor and get things running
pipe and all !

Then place a two liter plastic coke bottle up to the pipe mark for a hole for the pipe to insert into the coke bottle and remove the lid to the coke bottle and this quiet's it down greatly !
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I guess it works like a ext to the pipe!
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Old 06-04-2008, 01:01 PM   #10
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Quote:
Originally Posted by Big Jeff BBQ View Post
I've seen this done at wintrnats!

get every thing ready to break in start the motor and get things running
pipe and all !

Then place a two liter plastic coke bottle up to the pipe mark for a hole for the pipe to insert into the coke bottle and remove the lid to the coke bottle and this quiet's it down greatly !
later
Jeff E

I guess it works like a ext to the pipe!

You got my curiousty!
Do you mean insert the stinger from the pipe into the coke bottle? I want to try this!
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Old 06-04-2008, 01:27 PM   #11
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good info guys, I like the coke bottle idea, I am thinking of making some sort of a muffler for it, that won't impede as much as the bucket of water.
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Old 06-04-2008, 02:43 PM   #12
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Quote:
Originally Posted by Big Jeff BBQ View Post
I've seen this done at wintrnats!

get every thing ready to break in start the motor and get things running
pipe and all !

Then place a two liter plastic coke bottle up to the pipe mark for a hole for the pipe to insert into the coke bottle and remove the lid to the coke bottle and this quiet's it down greatly !
later
Jeff E

I guess it works like a ext to the pipe!

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?
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Old 06-04-2008, 03:34 PM   #13
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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.
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Old 06-04-2008, 04:23 PM   #14
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Default intake

I dont believe there is much that can be done on the intake side, due to the propeller coming so close to the carb. I was concerned about that with regards to debris getting into the engine, but I have been using the break-in bench for about 3 years and never had any problems.
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Old 06-04-2008, 04:44 PM   #15
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I dont believe there is much that can be done on the intake side, due to the propeller coming so close to the carb. I was concerned about that with regards to debris getting into the engine, but I have been using the break-in bench for about 3 years and never had any problems.

I use an air filter off of my 2.5 Tmaxx it has just enogh clearence not to hit the prop. I had to cut a notch in the prop cover . I just can't run an 500.00 engine with no filter. The 2.5 tmaxx filter has a very short 45 degree angle
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