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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › fettling an exhaust
09-02-2003 01:54 AM  15 years agoPost 1
Dan C


Barnsley, Yorkshire

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well you have seen the playstation advert " the devil makes work for idle thumbs" and I have to admit I fell prey last night and fettled my standard TT70 muffler with a needle file etc.

I was carrying out routine inspections on the model (R60 V2) and I had a suspsion I had run the engine a bit lean and just wanted to check etc.

anyway I removed the muffler and on the manifold surface either side of exhaust port there were 2 brownish marks on the exhaust, so I filed and radiused the port so that the entire brown area was now a open port from the engine exhaust.

I have not noticed a disadvantage while flying and it seemed very smooth running, and I am sure quieter ( it could be my perception only)

Has anyone else done something like this? and if so have you noticed any diference in performance.

Am I correct in thinking I have carried out something similar to gas flowing the engine eg removed constrictions and removed turblunce in the gas flow allowing the engine to vent the exhaust gas's quicker.

what counts in 2 stroke exhausts the gas flow or the volume of the exhaust chamber ?

eg if a set volume of gas can vent quicker from the cylinder and into a exhaust chamber but the overall pressure still builds up in the chamber so the new fuel charge is prevented from leaving the cylinder will this affect the preformance more than the 2 small triangles of metal I removed eg 6 mm wide by 8mm adjancent by 5 mm opposite the hypothenuse is raduised slightly concave. eg adding to the exhaust chamber volume.

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