Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
July-2017
Mark Boesen's

Nice original Babe Bee from a Super Cub 105, late fifties.



PAST WINNERS
CEF Traveling Engine

Tach Race 2017 Updates
Ready for Tach Race 2017?
Profile Scale Reed Speed
Gallery


Win This Engine!
The Traveling Prop
World of Aviation

muffle/exhaust 049

View previous topic View next topic Go down

Wanted muffle/exhaust 049

Post  robot797 on Sun Feb 01, 2015 12:43 pm

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)
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  roddie on Sun Feb 01, 2015 6:34 pm

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
avatar
roddie
Top Poster
Top Poster

Posts : 4980
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Mon Feb 02, 2015 2:51 pm

not found yet
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  ian1954 on Mon Feb 02, 2015 5:11 pm

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?

avatar
ian1954
Diamond Member
Diamond Member

Posts : 2417
Join date : 2011-11-16
Age : 62
Location : England

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Mon Feb 02, 2015 5:18 pm

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 Razz

and about the link your right the ) should be removed
http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Oldenginerod on Mon Feb 02, 2015 5:22 pm

Ian.  The original link just requires the ")" to be dropped from the end to work.  I wonder whether a Cox exhaust collector could be used as a manifold to direct the exhaust into a "catch-can" type muffler.
 
These are pretty common & easy to find.  Ex Model Engines generally has them but they're currently out of stock.  The priming hole would need to be plugged, but a pipe could easily be attached to the outlet.
Rod.
avatar
Oldenginerod
Diamond Member
Diamond Member

Posts : 1765
Join date : 2012-06-15
Age : 54
Location : Victoria, Australia

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Oldenginerod on Mon Feb 02, 2015 5:24 pm

Sorry, Robot797 posted as I was. If you're using a throttle ring then forget my suggestion.

Rod.
avatar
Oldenginerod
Diamond Member
Diamond Member

Posts : 1765
Join date : 2012-06-15
Age : 54
Location : Victoria, Australia

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Mon Feb 02, 2015 5:26 pm

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)
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  roddie on Mon Feb 02, 2015 5:39 pm

2nd PM sent.
avatar
roddie
Top Poster
Top Poster

Posts : 4980
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  akjgardner on Mon Feb 02, 2015 6:20 pm

hey,I just saw one on ebay for ten bucks.I just typed cox engines.
avatar
akjgardner
Platinum Member
Platinum Member

Posts : 694
Join date : 2014-12-28
Age : 57
Location : Milan Indiana

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  ian1954 on Mon Feb 02, 2015 6:31 pm

There is always the Tatone muffler

avatar
ian1954
Diamond Member
Diamond Member

Posts : 2417
Join date : 2011-11-16
Age : 62
Location : England

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  roddie on Mon Feb 02, 2015 6:34 pm

Question: Do dieselized Cox engines with SPI cylinders suffer from the use of a muffler, like the glow ignition engines do?
avatar
roddie
Top Poster
Top Poster

Posts : 4980
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  ian1954 on Tue Feb 03, 2015 6:24 am

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.



avatar
ian1954
Diamond Member
Diamond Member

Posts : 2417
Join date : 2011-11-16
Age : 62
Location : England

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  roddie on Tue Feb 03, 2015 6:58 am

Thanks Ian. You've answered quite a few questions that I had.
avatar
roddie
Top Poster
Top Poster

Posts : 4980
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  GallopingGhostler on Tue Feb 03, 2015 7:14 am

ian1954 wrote:There is always the Tatone muffler

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

avatar
GallopingGhostler
Platinum Member
Platinum Member

Posts : 1154
Join date : 2013-07-13
Location : Clovis, NM, US

View user profile http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Surfer_kris on Tue Feb 03, 2015 8:15 am

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)
avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1270
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Tue Feb 03, 2015 11:27 am

ian1954 wrote:There is always the Tatone muffler


that is one nice exhaust


the reason why i want an exhaust is becaus i want the fumes and oil to be collected in a diverent spot instead of the whole generator
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  GallopingGhostler on Tue Feb 03, 2015 11:50 am

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....
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.

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.
avatar
GallopingGhostler
Platinum Member
Platinum Member

Posts : 1154
Join date : 2013-07-13
Location : Clovis, NM, US

View user profile http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Surfer_kris on Tue Feb 03, 2015 2:00 pm

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.

avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1270
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Tue Feb 03, 2015 2:05 pm

even that type of exauhst would fit my need Smile
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  GallopingGhostler on Tue Feb 03, 2015 2:26 pm

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! Thumbs Up
avatar
GallopingGhostler
Platinum Member
Platinum Member

Posts : 1154
Join date : 2013-07-13
Location : Clovis, NM, US

View user profile http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  ian1954 on Tue Feb 03, 2015 4:45 pm

There is the cheap and cheerful way. Take a piece of aluminium tube, slice out a section in the middle, bend it around the cylinder and hold it tight with a nut and bolt.



Not quite but it does direct the exhaust! This was a standard muffler for DC engines.
avatar
ian1954
Diamond Member
Diamond Member

Posts : 2417
Join date : 2011-11-16
Age : 62
Location : England

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Wed Feb 04, 2015 11:44 am

that is awsome

that is whet i will try
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Surfer_kris on Wed Feb 04, 2015 1:46 pm

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.
avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1270
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  robot797 on Wed Feb 04, 2015 3:30 pm

ah crap that is to bad
avatar
robot797
Gold Member
Gold Member

Posts : 293
Join date : 2013-07-28
Age : 27

View user profile

Back to top Go down

Wanted Re: muffle/exhaust 049

Post  Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum