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Cox Engine of The Month
muffle/exhaust 049
Page 1 of 1
muffle/exhaust 049
hello
who has a exaust for me
i am working on a little cox diesel generator
but i realy would like for the oil to be collected in one place
so does anybody have a exhaus/muffler that allows me to reroute the oil and fumes
(the firsth one on this page would be the bomb http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm)
who has a exaust for me
i am working on a little cox diesel generator
but i realy would like for the oil to be collected in one place
so does anybody have a exhaus/muffler that allows me to reroute the oil and fumes
(the firsth one on this page would be the bomb http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm)
robot797- Platinum Member
- Posts : 742
Join date : 2013-07-28
Age : 33
Re: muffle/exhaust 049
robot797 wrote:hello
who has a exaust for me
i am working on a little cox diesel generator
but i realy would like for the oil to be collected in one place
so does anybody have a exhaus/muffler that allows me to reroute the oil and fumes
(the firsth one on this page would be the bomb http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm)
PM sent to you
Re: muffle/exhaust 049
It sounds like a nice project but I think, the link doesn't work for me, that you are referring to the Hiscott muffler. This is a rare item and, if you find one, will not be cheap. It was designed to be installed on the Cox Medallion 049
The only alternative I can think of would be
http://www.google.co.uk/imgres?imgurl=http://www.densmodelsupplies.co.uk/media/uploads/muffler_1292270355.JPG&imgrefurl=http://densmodelsupplies.co.uk/digest.php?view%3D35%26active_page%3D1&h=534&w=400&tbnid=2XBnnu9wfrouJM:&zoom=1&docid=zGne7Izl901oLM&ei=UAPQVOyrEMreao6HgMAG&tbm=isch&ved=0CCEQMygAMAA
or this and add a homemade muffler
http://www.google.co.uk/imgres?imgurl=https://i.servimg.com/u/f49/17/19/84/93/imag0514.jpg&imgrefurl=https://www.coxengineforum.com/t1195-wanted-muffler-for-049&h=475&w=800&tbnid=g-inxp2knAokgM:&zoom=1&docid=bWanm5zDGFNPbM&ei=4QHQVOmXMsbvaueXglg&tbm=isch&ved=0CC4QMygmMCY4ZA
These (if you are using a TD) may also need a spacer on the venturi.)
Which Cox engine have you dieselised?
The only alternative I can think of would be
http://www.google.co.uk/imgres?imgurl=http://www.densmodelsupplies.co.uk/media/uploads/muffler_1292270355.JPG&imgrefurl=http://densmodelsupplies.co.uk/digest.php?view%3D35%26active_page%3D1&h=534&w=400&tbnid=2XBnnu9wfrouJM:&zoom=1&docid=zGne7Izl901oLM&ei=UAPQVOyrEMreao6HgMAG&tbm=isch&ved=0CCEQMygAMAA
or this and add a homemade muffler
http://www.google.co.uk/imgres?imgurl=https://i.servimg.com/u/f49/17/19/84/93/imag0514.jpg&imgrefurl=https://www.coxengineforum.com/t1195-wanted-muffler-for-049&h=475&w=800&tbnid=g-inxp2knAokgM:&zoom=1&docid=bWanm5zDGFNPbM&ei=4QHQVOmXMsbvaueXglg&tbm=isch&ved=0CC4QMygmMCY4ZA
These (if you are using a TD) may also need a spacer on the venturi.)
Which Cox engine have you dieselised?
ian1954- Diamond Member
- Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England
Re: muffle/exhaust 049
i have a custom sure start diesel with heavy duty crankshaft
i have both exausts you show
but they but have problems
the 1sth one leaks becaus of the throttle ring
i can weld this shut but then i have to enlarge the opening to keep a good flow
the second is just sheit
i have no good words for it
and about the link your right the ) should be removed
http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
i have both exausts you show
but they but have problems
the 1sth one leaks becaus of the throttle ring
i can weld this shut but then i have to enlarge the opening to keep a good flow
the second is just sheit
i have no good words for it
and about the link your right the ) should be removed
http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
robot797- Platinum Member
- Posts : 742
Join date : 2013-07-28
Age : 33
Re: muffle/exhaust 049
Ian. Â The original link just requires the ")" to be dropped from the end to work. Â I wonder whether a Cox exhaust collector could be used as a manifold to direct the exhaust into a "catch-can" type muffler.
Â
These are pretty common & easy to find. Â Ex Model Engines generally has them but they're currently out of stock. Â The priming hole would need to be plugged, but a pipe could easily be attached to the outlet.
Rod.
Â
These are pretty common & easy to find. Â Ex Model Engines generally has them but they're currently out of stock. Â The priming hole would need to be plugged, but a pipe could easily be attached to the outlet.
Rod.
Oldenginerod- Top Poster
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Age : 61
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Re: muffle/exhaust 049
Sorry, Robot797 posted as I was. If you're using a throttle ring then forget my suggestion.
Rod.
Rod.
Oldenginerod- Top Poster
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Re: muffle/exhaust 049
that is the point i dont want to have a trothle ring
but this exaust has one
http://www.google.co.uk/imgres?imgurl=http://www.densmodelsupplies.co.uk/media/uploads/muffler_1292270355.JPG&imgrefurl=http://densmodelsupplies.co.uk/digest.php?view%3D35%26active_page%3D1&h=534&w=400&tbnid=2XBnnu9wfrouJM:&zoom=1&docid=zGne7Izl901oLM&ei=UAPQVOyrEMreao6HgMAG&tbm=isch&ved=0CCEQMygAMAA
i also have one of those and i actualy do not want to modifie it (becaus it was expencive)
but this exaust has one
http://www.google.co.uk/imgres?imgurl=http://www.densmodelsupplies.co.uk/media/uploads/muffler_1292270355.JPG&imgrefurl=http://densmodelsupplies.co.uk/digest.php?view%3D35%26active_page%3D1&h=534&w=400&tbnid=2XBnnu9wfrouJM:&zoom=1&docid=zGne7Izl901oLM&ei=UAPQVOyrEMreao6HgMAG&tbm=isch&ved=0CCEQMygAMAA
i also have one of those and i actualy do not want to modifie it (becaus it was expencive)
robot797- Platinum Member
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Join date : 2013-07-28
Age : 33
Re: muffle/exhaust 049
hey,I just saw one on ebay for ten bucks.I just typed cox engines.
akjgardner- Diamond Member
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Posts : 1469
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ian1954- Diamond Member
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Join date : 2011-11-16
Age : 69
Location : England
Re: muffle/exhaust 049
Question: Do dieselized Cox engines with SPI cylinders suffer from the use of a muffler, like the glow ignition engines do?
Re: muffle/exhaust 049
roddie wrote:Question: Do dieselized Cox engines with SPI cylinders suffer from the use of a muffler, like the glow ignition engines do?
They do and for exactly the same reasons.
It also depends on what you call "suffering" - I have engines that were designed for use with a silencer and that silencer was developed with the engine. Some of these engines don't throttle happily without the silencer/muffler attached.
The introduction of the requirement for silencers killed the performance of many engines. SPI or not, added weight and ruined a previously perfect engine/model combination.
The Cox wrap around mufflers are not great and I have never been an advocate of throttling by restricting the exhaust.
If you are happy with reduced performance, for SPI and non SPI, the engine can still be set to run at a single speed. Throttling and SPI can be unsuccessful.
The addition of a diesel head to a Cox engine also brings additional problems. It also needs the venturi reducing or it glugs diesel like I drink beer. They run rich and this also compounds SPI and muffler issues.
In the strictest sense the Cox muffllers produced for the Bees don't muffle enough. They are still too noisy for such small engines to be allowed at most flying fields in the UK.
The Cox RC .05, .09 and the Queen Bee are passable. By far the best is the Hiscott/medallion 049 combination. All have no SPI.
ian1954- Diamond Member
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Age : 69
Location : England
Re: muffle/exhaust 049
Ian, I have one of those, bought it in the 1970's. I wasn't too happy with it as it was restrictive enough to reduce power significantly. I think the legacy Cox car engine muffler (photo provided by Rod) would have the same effect.
The annular ring Cox muffler isn't as restrictive, although it does cut some top end off.
Bernie's got an aftermarket he's designed and selling, which is reasonably priced:
http://coxengines.ca/cox-.049-muffler.html
GallopingGhostler- Top Poster
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Re: muffle/exhaust 049
There is a discussion here about muffler and Sure starts on diesel; RCU
Seems the already feeble Sure start engine will lose most of it's power....
A dedicated diesel, with muffler, would be much better to work with, such as the MP Jet .061 or one of the PAW engines (mufflers are optional for their smaller engines)
Seems the already feeble Sure start engine will lose most of it's power....
A dedicated diesel, with muffler, would be much better to work with, such as the MP Jet .061 or one of the PAW engines (mufflers are optional for their smaller engines)
Surfer_kris- Diamond Member
- Posts : 1900
Join date : 2010-11-20
Location : Sweden
Re: muffle/exhaust 049
Yes and no. Yes, it will lose some top end, depending on the muffler and amount of silencing required. In the video, I noticed the modeler was testing the engine, which had SPI. Cox made silenced engines had no SPI, to prevent dilution of the intake gases with inert exhaust gases.Surfer_kris wrote:There is a discussion here about muffler and Sure starts on diesel;
RCU
Seems the already feeble Sure start engine will lose most of it's power....
The aftermarket Tatone muffler was more restrictive. I only used it a short time because of that.
Mufflers are a fact of life in many places nowadays. In that case, one then chooses their power needs. A muffled reed valve engine may be more appropriate on slightly smaller airframes/lighter airframes that can get by with less power. It's all about matching the available power to the right airframe.
GallopingGhostler- Top Poster
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Posts : 5278
Join date : 2013-07-14
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Location : Clovis NM or NFL KC Chiefs
Re: muffle/exhaust 049
GallopingGhostler wrote:
Mufflers are a fact of life in many places nowadays. In that case, one then chooses their power needs. A muffled reed valve engine may be more appropriate on slightly smaller airframes/lighter airframes that can get by with less power. It's all about matching the available power to the right airframe.
Yes, I'm aware of that and I do have mufflers on all my engines.
I thought the link on RCU would be instructional in terms of the power, and power loss, one can have.
In the early 80-ties I made my own mufflers for cox engines. The trick is to have a large volume and no restriction right at the exhaust port. Plus no SPI of coarse.
Surfer_kris- Diamond Member
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Join date : 2010-11-20
Location : Sweden
Re: muffle/exhaust 049
even that type of exauhst would fit my need
robot797- Platinum Member
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Join date : 2013-07-28
Age : 33
Re: muffle/exhaust 049
Surfer_kris wrote:Yes, I'm aware of that and I do have mufflers on all my engines.
I thought the link on RCU would be instructional in terms of the power, and power loss, one can have. In the early 80-ties I made my own mufflers for cox engines. The trick is to have a large volume and no restriction right at the exhaust port. Plus no SPI of course.
Wow, Surfer_kris, that is quite an engineering feat you have there! I call that 1) determination, 2) hardwork, and 3) success!
GallopingGhostler- Top Poster
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ian1954- Diamond Member
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Age : 69
Location : England
Re: muffle/exhaust 049
that is awsome
that is whet i will try
that is whet i will try
robot797- Platinum Member
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Join date : 2013-07-28
Age : 33
Re: muffle/exhaust 049
That trick doesn't work on cox engines as the ports are larger/longer. You will not be able to seal the rear part, unless you use more than just the tube in that area.
Surfer_kris- Diamond Member
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Join date : 2010-11-20
Location : Sweden
Re: muffle/exhaust 049
ah crap that is to bad
robot797- Platinum Member
- Posts : 742
Join date : 2013-07-28
Age : 33
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