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Cox Engine of The Month
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Sold out Cox .049 silencers for sale
Page 1 of 1
Sold out Cox .049 silencers for sale
sosam117 Sat Mar 02, 2024 4:22 pm
These silencers are similar in design to the Cox .020 mufflers but slightly larger to accommodate the Cox .049 engine
Top of silencer
Bottom of silencer
Installation instructions
Please check the cylinder dimensions:
As the cylinder sleeve sizes vary slightly you might have to adjust the fit?
The parts that interfere (i.D.) with the engine cylinder will need to be shaped. (enlarged?)
Using a slightly undersized wooden dowel and some 220-grit sandpaper wrapped around the dowel to carefully enlarger the hole for the cylinder sleeve by twisting the dowel/sandpaper in the hole to enlarge it. Don't overdo it now! you want a snug /slip fit.
Included with the silencer are two different thickness size shims (.008" / .012") (0.2mm/ 0.3mm) to give the silencer a tight enough fit when the cylinder is tightened down and the silencer is snug enough to not move. If it does, you'll need to add one of the shims on the bottom side of the silencer.
One more FYI (if necessary) -- use a small amount of Permatex (non-hardening) gasket sealant on the upper and lower faces of the silencer to get a really good seal.
The exhaust tubing is 5mm I.D. diameter.
Thanks,
sosam117
Mike Mac
Top of silencer
Bottom of silencer
Installation instructions
Please check the cylinder dimensions:
As the cylinder sleeve sizes vary slightly you might have to adjust the fit?
The parts that interfere (i.D.) with the engine cylinder will need to be shaped. (enlarged?)
Using a slightly undersized wooden dowel and some 220-grit sandpaper wrapped around the dowel to carefully enlarger the hole for the cylinder sleeve by twisting the dowel/sandpaper in the hole to enlarge it. Don't overdo it now! you want a snug /slip fit.
Included with the silencer are two different thickness size shims (.008" / .012") (0.2mm/ 0.3mm) to give the silencer a tight enough fit when the cylinder is tightened down and the silencer is snug enough to not move. If it does, you'll need to add one of the shims on the bottom side of the silencer.
One more FYI (if necessary) -- use a small amount of Permatex (non-hardening) gasket sealant on the upper and lower faces of the silencer to get a really good seal.
The exhaust tubing is 5mm I.D. diameter.
Thanks,
sosam117
Mike Mac
Last edited by sosam117 on Fri May 10, 2024 6:40 pm; edited 5 times in total (Reason for editing : Sold out)
sosam117- Diamond Member
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Re: Sold out Cox .049 silencers for sale
1/2A Nut Mon Mar 04, 2024 8:13 am
I bought 1 to test, the 5mm ID header should help the engine breath.
Thank you Mike!
Thank you Mike!
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Re: Sold out Cox .049 silencers for sale
roddie Mon Mar 04, 2024 4:06 pm
Hi Mike, What's the approx. weight of the silencer?
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Re: Sold out Cox .049 silencers for sale
sosam117 Mon Mar 04, 2024 5:12 pm
roddie wrote:Hi Mike, What's the approx. weight of the silencer?
Roddie,
The .020 silencer is 1.3 grams and the .049 is 2.4 grams
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Re: Sold out Cox .049 silencers for sale
sosam117 Sun Mar 10, 2024 6:49 pm
Still have "four" .049 silencers for sale?
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Re: Sold out Cox .049 silencers for sale
davidll1984 Mon Mar 11, 2024 8:38 am
The collector would be perfect with this rc tuned pipe 
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Re: Sold out Cox .049 silencers for sale
1/2A Nut Sun Mar 31, 2024 2:11 am
My .049 exhaust manifold came in the mail, looks like it will breath just fine.
Mike did a good job on these, can recommend.
Mike did a good job on these, can recommend.
1/2A Nut- Top Poster
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Re: Sold out Cox .049 silencers for sale
Greenman38633 Sun Mar 31, 2024 8:43 am
I definitely would like one. PM sent to Sosam 117
Mark Green
Mark Green
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Re: Sold out Cox .049 silencers for sale
sosam117 Sun Mar 31, 2024 9:35 am
Greenman38633 wrote:I definitely would like one. PM sent to Sosam117
Mark Green
O.K. Mark!
Sent you a PM on payment.
Thanks,
Mike Mac
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Re: Sold out Cox .049 silencers for sale
1/2A Nut Wed May 22, 2024 7:24 pm
Hey Mike, hope things are all going well.
I have run into a need for more shims for the Killer Bee .049.
Looks like 2 more sets to hold the manifold up as it sits down on the
crank case top without the shims. Guessing on the shims at 1.4mm
may need 3 x .3 +2 x.2 - 1.3mm to snug up or 5 x .3 -1.5mm
I have run into a need for more shims for the Killer Bee .049.
Looks like 2 more sets to hold the manifold up as it sits down on the
crank case top without the shims. Guessing on the shims at 1.4mm
may need 3 x .3 +2 x.2 - 1.3mm to snug up or 5 x .3 -1.5mm
1/2A Nut- Top Poster
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Location : Brad in Texas
Re: Sold out Cox .049 silencers for sale
GallopingGhostler Thu May 23, 2024 12:32 pm
Brad, I enjoy reading about your ventures, because they have a touch of class and on the high performing end, never a dull moment. 
I suppose in a pinch one could substitute a couple wraps of 16 gauge bare soft iron or copper wire to fill the gap, then carefully twist (say, 14 - 16 turns per inch), clip off to a 3/8th inch pigtail, nicely curl into an out-of-the way loop with some needle nose pliers, so it doesn't poke a finger.
Mighty nice professional finished work, by the way.
I suppose in a pinch one could substitute a couple wraps of 16 gauge bare soft iron or copper wire to fill the gap, then carefully twist (say, 14 - 16 turns per inch), clip off to a 3/8th inch pigtail, nicely curl into an out-of-the way loop with some needle nose pliers, so it doesn't poke a finger.
Mighty nice professional finished work, by the way.
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Re: Sold out Cox .049 silencers for sale
sosam117 Thu May 23, 2024 2:59 pm
1/2A Nut wrote:Hey Mike, hope things are all going well.
I have run into a need for more shims for the Killer Bee .049.
Looks like 2 more sets to hold the manifold up as it sits down on the
crank case top without the shims. Guessing on the shims at 1.4mm
may need 3 x .3 +2 x.2 - 1.3mm to snug up or 5 x .3 -1.5mm
That gap is/was for the spring starter?
The spring starter measures about 1.0mm in width
PM me and I'll make up some shims for you.
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Re: Sold out Cox .049 silencers for sale
1/2A Nut Fri May 24, 2024 4:50 am
Thank you for the kind words George and Mike for the shims!!
Look forward to running the manifold with a pipe so need a good seal.
Look forward to running the manifold with a pipe so need a good seal.
1/2A Nut- Top Poster
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Re: Sold out Cox .049 silencers for sale
sosam117 Fri May 24, 2024 4:04 pm
I have the shims punched out.
Had a little time to do it as we had a storm go through Plainfield (Chicagoland) and lost power for a couple of hours.
So, took the time to get the punch set out and the shim stock and "Get r Done!"
I punched out three shims for 1/2A Nut.
One is 0.62mm (about .025")
The aluminum spacer is 0.21 (about .008")
And the last is another one at 0.63m (about .025")
For a total of about 1.45mm (.057")
My punch set only goes up to .020" (0.50mm) ---- so it was a little tight to get the .025 shim stock into the punch holder.
Had a little time to do it as we had a storm go through Plainfield (Chicagoland) and lost power for a couple of hours.
So, took the time to get the punch set out and the shim stock and "Get r Done!"
I punched out three shims for 1/2A Nut.
One is 0.62mm (about .025")
The aluminum spacer is 0.21 (about .008")
And the last is another one at 0.63m (about .025")
For a total of about 1.45mm (.057")
My punch set only goes up to .020" (0.50mm) ---- so it was a little tight to get the .025 shim stock into the punch holder.
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Location : Suburb of Chicago, Illinois
Re: Sold out Cox .049 silencers for sale
1/2A Nut Fri May 24, 2024 7:46 pm
Great that will work,
The gap was enough for a spring starter no doubt.
PP sent, much appreciated Mike!
The gap was enough for a spring starter no doubt.
PP sent, much appreciated Mike!
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Re: Sold out Cox .049 silencers for sale
sosam117 Sat May 25, 2024 8:41 am
I messed up on that one?
It is a little short for using without the spring starter (manifold alone --- should measure 11.35mm) and it is just a little too long for the spring starter (spring starter measures 1.2mm so the manifold overall length should be about 10.15mm)
So, 1/2A Nut (since you measured the overall length) and it reads 11.05mm the one 0.21mm and one of the other shims should cover the length?
And you have the other "2" shims at 0.62mm which you could sand down to a thinner thickness (if need be?)
Mike
Actual overall length should be for the 049 manifold:
It is a little short for using without the spring starter (manifold alone --- should measure 11.35mm) and it is just a little too long for the spring starter (spring starter measures 1.2mm so the manifold overall length should be about 10.15mm)
So, 1/2A Nut (since you measured the overall length) and it reads 11.05mm the one 0.21mm and one of the other shims should cover the length?
And you have the other "2" shims at 0.62mm which you could sand down to a thinner thickness (if need be?)
Mike
Actual overall length should be for the 049 manifold:
sosam117- Diamond Member
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Re: Sold out Cox .049 silencers for sale
1/2A Nut Sat May 25, 2024 1:14 pm
Per the pic uncompressed showed a need for 3 extra shims and estimated values.
Best to play it safe and send what you made, no telling for sure what the actual combo will be.
Best to play it safe and send what you made, no telling for sure what the actual combo will be.
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Re: Sold out Cox .049 silencers for sale
sosam117 Sun May 26, 2024 6:16 am
Posted the three shims in the mail yesterday (Saturday May25,2024).
Should get them in a couple of days --- after Memorial Day Holiday.
Thanks 1/2A Nut!
Mike
Should get them in a couple of days --- after Memorial Day Holiday.
Thanks 1/2A Nut!
Mike
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Location : Suburb of Chicago, Illinois
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