RCU Forums

RCU Forums (https://www.rcuniverse.com/forum/)
-   RC Helicopter General Discussions (https://www.rcuniverse.com/forum/rc-helicopter-general-discussions-129/)
-   -   Scratch made muffler (https://www.rcuniverse.com/forum/rc-helicopter-general-discussions-129/7766546-scratch-made-muffler.html)

bensidus197217 07-24-2008 08:32 AM

Scratch made muffler
Has anyone ever scratch made a quiet muffler for a nitro engine. It seems you can't buy a muffler that doesn't make a lot of racket. I know motor vehicles can be made quiet so why not nitro engines? I have the tooling (lathe, milling machine, etc) to be able to manufacture one. I wonder if you made the outlet pipe a bigger diameter increased the size of the muffler itself and baffled it would that work? How much back pressure does one really need? Has anyone experimented with this before?

syclic 07-24-2008 11:41 PM

RE: Scratch made muffler
Hmmm...I have purchased and used a number of mufflers in the past that only read only 84db at 3 meters (9 feet). That is considered to be relatively very quiet. And a number of them where also relatively inexpensive.

bensidus197217 07-28-2008 01:28 AM

RE: Scratch made muffler
I have a Rapter 30 with a nice running OS engine, the muffler on it is quiet at idle but that changes once the RPM goes up. What was a good muffler in your opinion Syclic?

syclic 07-28-2008 10:38 PM

RE: Scratch made muffler
Here are the two I have used on an OS-37 that read 84 db @ 9 feet in the hover at 1700 rpm and that produce very good power while leaving the needle settyings very user friendly

1 - the Century CN3037 - surprisingly good for its low price (around $40.00)

2 - the KSJ #1545 - though it measures the same on the SPL meter and prvided the same power, it did sound a bit more mellow (around $80.00)

All times are GMT -8. The time now is 12:05 AM.

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.