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OS silencers


EGB 953
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Just acquired a lovely first series Acro Wot from a gentleman who no longer flies. 
 

All looks in decent nick, except for the silencer on the OS46SF engine, which is missing the rear casing - it apparently fell off in flight some years ago. 
 

it doesn’t seem that easy to replace, in looking at the manual an OS873 silencer is specified but I don’t seem to see many of those available. 
 

are there other options? Are silencers fairly standard or do you have to go with one specified? Do all engine types have different sizes or would the silencer for a more recent OS 46 fit?

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Good Morning EGB!

 

Just Engines offer a range of silencers, either standard or "quiet," which will suit your engine. In order to be sure, just measure the distance between centres of the mounting holes, dimesion "c" on the drawing. They claim that their silencers with 35mm between the bolt holes will fit an OS engine which has 35.5 mm spacing.   https://www.justengines.co.uk/product-category/exhaust-systems/two-stroke-exhausts/standard-mufflers/?v=11aedd0e4327

 

A range of special exhausts is available to order from Weston UK. I had one made for an SC 32 and it is very impressive though they are more expensive than a standard silencer. https://www.westonuk.co.uk/Genesis-Pipes/

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32 minutes ago, David Davis 2 said:

Good Morning EGB!

 

Just Engines offer a range of silencers, either standard or "quiet," which will suit your engine. In order to be sure, just measure the distance between centres of the mounting holes, dimesion "c" on the drawing. They claim that their silencers with 35mm between the bolt holes will fit an OS engine which has 35.5 mm spacing.   https://www.justengines.co.uk/product-category/exhaust-systems/two-stroke-exhausts/standard-mufflers/?v=11aedd0e4327

 

A range of special exhausts is available to order from Weston UK. I had one made for an SC 32 and it is very impressive though they are more expensive than a standard silencer. https://www.westonuk.co.uk/Genesis-Pipes/

Good morning!

 

thank you that is very helpful, I will measure up and get in touch with them. What are the advantages of the specialist ones? Better engine performance?
 

 

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Hi EGB. The weston silencers or pipes are tuned for outright performance or throttle responce  and are verh good . Your os silencer mising part is likely the same size as those fitted to many chinese clones like ASP, SC  etc. There are loads about secondhand have alook on ebay and check mounting hole centers. Also measure the inside diameter of the exhaust you have and you may 

 a used end cone and through bolt on here .

 

 

 

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52 minutes ago, Engine Doctor said:

Hi EGB. The weston silencers or pipes are tuned for outright performance or throttle responce  and are verh good . Your os silencer mising part is likely the same size as those fitted to many chinese clones like ASP, SC  etc. There are loads about secondhand have alook on ebay and check mounting hole centers. Also measure the inside diameter of the exhaust you have and you may 

 a used end cone and through bolt on here .

 

 

 

Thanks! Will browse this afternoon! Good to know there’s a fair bit of standardisation.  

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13 hours ago, David Davis said:

This might be suitable for your engine. It's cheap enough but it could do with a clean. https://www.ebay.co.uk/itm/355534920581?itmmeta=01HTWSZWXSYGJ193VZ1JVBTGB2&hash=item52c7885b85:g:EDcAAOSwIvdl7xjg

Thanks, I measured the gap between the mounting holes and it is 37mm. As luck would have it I have found a silencer for an Irvine46 that fits nicely.  

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I hada similar experience! I bought an OS 46 AX second hand minus the silencer but found something suitable in my box of two-stroke exhausts. I must fit the engine to the club's trainer and remove my beloved Enya 50 which is destined to go into a Calmato Alpha. Can't have such a beautifully made engine in the clumsy paws of beginners! 😏

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