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Old 10-08-2020, 07:12 PM   #1
NEW222
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Nitro Engine Exhaust Spacer


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So, I have recently aquired a K&B 65 Sportster engine that was missing a Thrust washer, of which I now have on the way. It was a few days ago when I had noticed something else while reading up on the Sportster series of engines. The exhaust is and was bolted up to the engine when I got it, so definately did not notice it then, but now I do see that I am also missing a spacer between the muffler and the engine. So, I was just wondering if by any chance anyone here had ever made a spacer for an rc engines muffler? I do not have any machine tools, so by hand it would have to be made. I do have the compliment of cordless drill, drill press, and files, but that is about it. I know it would be truly unorthodox, but making a spacer from a piece of a very hard wood had crossed my mind, but was told that it would not work. So I am open to any ideas or help with this as to how to proceed. Would standard aluminum possibly work, or does it have to be some sort of steel? Not looking to make anything fancy, just functional. Thank you.
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Old 10-08-2020, 07:30 PM   #2
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Re: Nitro Engine Exhaust Spacer

Need to know the spacing between the holes center to center
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Old 10-08-2020, 07:37 PM   #3
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Re: Nitro Engine Exhaust Spacer

Dubro still has one available but you need to check the spacing

https://www.towerhobbies.com/product...-1/DUB699.html
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Old 10-08-2020, 07:41 PM   #4
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Re: Nitro Engine Exhaust Spacer

Sorry, I did forget that. The spacing is 1 1/2" center to center of the mounting holes. Another little tidbit I also just recognized is that they had used brass screws to hold the muffler to the engine as well of which I am sure were not factory...... Shame on me for not noticing these little mistakes before.
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Old 10-08-2020, 07:46 PM   #5
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Re: Nitro Engine Exhaust Spacer

Shoot, just a tad too narrow. Thanks for the link though, as now that I see one, it does not look all that complicated to make. I think that I was personally overthinking making one. I guess I would juat need to know the width/length that I need and go from there. Thank you.

Also, I am thinking that since this is an older 'tank' of an engine things were probably bigger back then as well.
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Old 10-08-2020, 07:53 PM   #6
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Re: Nitro Engine Exhaust Spacer

That spacer is tapered and cut round on one side to fit on the round muffler.
You could cut it straight and it would angle in a bit towards the plane. If you don't get it to seal on the muffler it might make a bit of a mess when running. The muffler screws should be a standard size being made in the USA. Cheers Floyd
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Last edited by floyd; 10-08-2020 at 08:00 PM.
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Old 10-08-2020, 08:06 PM   #7
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Re: Nitro Engine Exhaust Spacer

Interesting. Thank you floyd for those pictures. They will be a great help in my endeavour. I honestly was going to make it straight and not angled like what I now see. As for the contour, I did notice that when I looked at my muffler. Nothing some careful filing with a round file cannot do! It is also actually a bit wider than I had thought it would be too. But I guess one can make whatever length needed.
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Old 10-08-2020, 10:58 PM   #8
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Re: Nitro Engine Exhaust Spacer

Dubro use to sell a bar length of exhaust extension. Just cut it to length in a bandsaw, mark and drill the holes and done. I bought a length of it years ago but not sure if they still sell it that way or not now.


Just checked, Great Hobbies has it in stock and should work for your application.

https://www.greathobbies.com/product...prod_id=DUB213
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Old 10-08-2020, 11:26 PM   #9
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Re: Nitro Engine Exhaust Spacer

Thank you. Saw the other one listed but was too small. But just as an update, help is on the way..... Thank you all for the help and ideas.
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Old 10-11-2020, 10:38 AM   #10
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Re: Nitro Engine Exhaust Spacer

Assuming they are still in business, maybe you can get Bisson Mufflers to make you a muffler with the extension already built in and then just strap it on.
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