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#Post#: 6651--------------------------------------------------
EXHAUSTS
By: Ian F Date: May 4, 2022, 10:50 am
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I picked up an exhaust pipe for a GX1160/GX200 off Marketplace
over the weekend, which I will be fitting to my CK.
I have ordered a Stage 1 engine from GX tuning, but this comes
with a de-baffled OEM exhaust, however I want a system that will
pass the exhaust out through the body-side.
I will need a silencer to go on the end of the pipe, but was
concerned with allowable noise levels, and wondered what noise
restrictions various venue have?
I came across the following figures for GX200's on the internet:
EXHAUST TYPE db@idle db@ 4,000 rpm
OEM 85 98
debaffled OEM 87 100
Pipe & silencer 92.5 104.5
Open pipe 100.5 111
I was looking to fit a RLV high flow muffler or RLV high flow
muffler with additional baffles as sold by GX Tuning, but would
like to hear (no pun intended) what others have found
successful? I would also consider making my own absorbtion type
silencer as the pipe and silencer at 104.5 seems quite loud to
me.
#Post#: 6655--------------------------------------------------
Re: EXHAUSTS
By: Tinworm Date: May 4, 2022, 11:09 am
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don't know if this is relevant, but makeshift machinegun
silencers can be made with washers and plumbers' olives
interspersed in a tube! The things you pick up...
#Post#: 6658--------------------------------------------------
Re: EXHAUSTS
By: Ian F Date: May 4, 2022, 11:56 am
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Thanks Tinworm ;D
I have some exhaust wadding leftovers in my workshop, so happy
to make my own. It looks to me as the table above shows the
pipe and muffler to be a bit on the limit, but then again it
does not say at what distance the noise was measured, so looking
to see what others have done and how successful their systems
are.
#Post#: 6661--------------------------------------------------
Re: EXHAUSTS
By: StefanN Date: May 4, 2022, 1:25 pm
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To get the hot exhaust out of the engine bay, you could add a
pipe to the outlet of the OEM exhaust. I think perhaps Chris’
ERA has something like that.
#Post#: 6662--------------------------------------------------
Re: EXHAUSTS
By: Ian F Date: May 4, 2022, 1:55 pm
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Thanks Stefan, I might resort to that if the pipe and silencer
is too loud.
#Post#: 6664--------------------------------------------------
Re: EXHAUSTS
By: Adrian Date: May 4, 2022, 2:15 pm
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You could route the exhaust out through some flexible pipe.
I did wonder about using some high temp Silcone tubing for that
but I have no knowledge of this at all.
:>)
#Post#: 6665--------------------------------------------------
Re: EXHAUSTS
By: Adrian Date: May 4, 2022, 2:25 pm
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Rhys has something on exhaust noise limits. I know I was well
over it. I've got a muffler from GX Tuning now.
#Post#: 6667--------------------------------------------------
Re: EXHAUSTS
By: Ian F Date: May 4, 2022, 2:37 pm
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Thanks Adrian, I would be interested to know which silencer you
bought and how effective it is :)
#Post#: 6672--------------------------------------------------
Re: EXHAUSTS
By: RhysN Date: May 4, 2022, 11:59 pm
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For circuits that are relevant to MSUK (and many kart circuits
are) the limit is supposed to be 95dBa measured at 2/3 throttle
with the meter 1 metre away from the exhaust, directly behind it
with no sound reflecting or absorbing surface nearby other than
the road (and supposedly hard surface). I only learned this on
Tuesday when I asked a scrutineer.
Some places get away with noise at the boundary of the property,
I wasn't able to get a number for that, it's individual
councils.
#Post#: 6673--------------------------------------------------
Re: EXHAUSTS
By: jim Date: May 5, 2022, 12:13 am
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It's a good job we're not part of the money grabbing, fun
destroying, Hypocritical embarrassment to humanity that is the
MSUK. A standard exhaust is louder than 95db so luckily we can
never be part of such a circus.
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