ASH. Posted March 20, 2019 Share Posted March 20, 2019 Thanks JD8, I'll give chlorine a miss. I have used Cillit Bang and non scratch scourer with good success on silencers with burnt on oil. But how to get to valve stem and exhaust chamber? Halfords may have something. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 21, 2019 Share Posted March 21, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted March 21, 2019 Share Posted March 21, 2019 Strongest stuff I would put near an aluminium engine would be carb cleaner . Chlorine reacts rather vigorously with aluminium . By the way much of the trouble on glow engines with weakening the mixture too far is from pre-ignition which can become detonation rather than the smooth combustion process we want ...hence all the heat and shock damage . Detonation shocks the engine causes massive heat build up. With glow engines and diesel, ignition timing is controlled by the mixture( as well as compression) . Leaner advances it and richer retards it. Lower compression also retards ignition( that’s why on some engines we need to lower compression for very high nitro fuel) Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 21, 2019 Share Posted March 21, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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