Mufflers on two strokes

[Dug]

Does anybody have a quick fix for noise suppression with two strokes (small pumps etc)
I understand they need a certain "flow" of gasses but is there a relatively simple muffler you can braze on or construct.

 

[Ryan1981]

hit up youtube mate there is a few vids on it,the best ive seen was a guy running some flexible metal hose off the exhaust, but then you have to carry that with you too.

Option two 4 stroke pump????

 

[Guest]

Option two 4 stroke pump????

what ryan said

honda gx25 pump

i know a bloke that worx at a dealer

 

[Ryan1981]

Thats a cool looking little pump there Doc, whats are the stats on the bad boy?

 

[Guest]

Thats a cool looking little pump there Doc, whats are the stats on the bad boy?

25cc engine
just on 500lt's per hr
25mm inlet/outlets

i'll have to check price on monday

 

[Ryan1981]

Bumma not enough water for what i need
But its looks nice and lite, if they could make somthing that small and lite that pushed 200LTM, it would be very handy indeed.
WX15 Im afraid i will have to bit the bullet.

Dug, just thinking more on topic,i wounder if you could find an old lawnmower exhust and join it up, but im sure this would reduce the power, hmm could be to restrictive.

In Canberra we have a recycling censtre called tinys green shed they always have heaps of old mowers and whipper snippers around, olny ever charge a few bucks for them.

 

[Dug]

I was wondering about that Honda whipper snipper motor ,Nice little unit.
The exhaust off a motorbike was my thinking along the same lines as a mower muffler .If you had flexible hose into a bucket of 20 mm screens that you could make on site would that help much??.
As you point out by the time you add those bits the weight /size advantage will be lost .
I'll have a go with an old motor if anything works I'll pass it on .

 

[Twapster]

An outboard motor (2 stoke) seems quieter under water. Not saying you should chuck the engine in the drink lol, but someone may know a way to use water to muffle the noise???? Just thinking out loud.

 

[MJB]

An outboard motor (2 stoke) seems quieter under water. Not saying you should chuck the engine in the drink lol, but someone may know a way to use water to muffle the noise???? Just thinking out loud.

A length of flexible steel piping emptying out under water would work Twapster....but it all starts to get a little messy. Little 2 strokes I would reckon can be fitted with just about any sort of muffler but will effect performance but as it will be for pumping water not a high performance motorbike I don't think it would cause a problem.

I would say save the pennies and get a 4 stroke motor.

 

[Buck]

Twapster, that would be fairly simple to set up. You could run a small pipe tapped into the outlet side of the pump and run it to a point in the muffler. Have a tap on the pipe so you don't just fill the muffler with water.

 

[yobskin]

I seen a guy run an extension from muffler to bucket of water and it gurgled some but was quiet ...he had a 4stroke too....im getting the rato 4stroke 3hp light n easy for my cart i might need a silencer i dig near live stock...lol i scared the shite out of them last time by farting! 50 head screaming past me knee deep in creek hahaha it was a follow through after that... :8
Any ideas ?

 

[mickance]

gday guys ..my trade is specialising in exhausts....car exhausts really but e strokes are a bit touchy with exhausts unlike 4 strokes wheew wxrea backpressure is not so critical.....to be honest with the price of 4 stroke pumps from china being so low i would just buy a 4 stroke rather than mick around but even with a 4 stroke id yo can get a pump the right capacity that will operate and perform at idle it will be so quieter than one that is reving ......much more relaxing

 

[Twapster]

I do like the smell of 2 stokes.....I must be sick!

 

[Guest]

I do like the smell of 2 stokes.....I must be sick!

nup

it's a passion/habbit/need ya cannot kick , specially if ya run them on castor oil mix

 

[Buck]

Ohhh castor mmmm used to use castor in my old rx7 smells amazing

 

[Sodabowski]

Re the exhaust issue. The silencer chamber volume must be at least ten times the motor's, or you can trick it, thing is you must reduce the reflection of each stroke back into the engine. Rockwool works a treat as a complement for mufflers, I modded the exhaust cartridge of a buddy's motorbike twenty years ago and put a good amount of the thing along the walls of the muffler, worked awesome, no noise and increased bike power: it peaked at 110 km/h after the mod, not bad for a 50cc bike, right? Dug if you can weld steel (not stainless) you could use an empty gas cannister, drill it to insert mesh steel in a roll along the vertical axis, stuff it with rock wool on the sides (add holes to the cannister on the sides too), add the steel mesh retainer cylinder down the vertical axis and solder an adapter pipe to add that to your pump's exhaust. The trick ith using rockwool is you have to mount the tube so the exhaust goes downwards, otherwise the unused oil will quickly saturate the wool and eventually it won't work anymore, so keeping it directed downwards will help the condensed exhaust to drip out.

 

[Sodabowski]

I do like the smell of 2 stokes.....I must be sick!

I'd add a hint of fresh concrete to that, smells so right...

 

[Tathradj]

You would have to have enough length on the pipe to stop it from sucking the water back into the motor when and if you shut it down with the rev's up.
Been there, Done that. LOL.
As Sodabowski said, A well packed cylinder muffler. Can also use stainless steel wool.

 

[Sodabowski]

Never thought of stainless steel wool, great tip there mate!

 

[yobskin]

Well just so ya all know a muffler manufracture told me to get a ford fairlane heater hose! It has two crazy bends cost me $14.50.
Started up pump, added hose to muffler all i could hear was pump n engine noise...no muffler sound!!! I couldnt believe it so simple...so quiet!!! :lol: now i can hear me hotdogs cooking...lol