jonnyk5614 Posted March 28, 2012 Share Posted March 28, 2012 Got a 2500S with pre-ignition (it runs on for a while where you turn the engine off). I'm pretty sure I have a blow off the rear of the exhaust gasket. Also, the spark plugs at that end are sooty.Here is my theory: Rear gasket failure reduces back pressure causing buildup of carbon which is building up, getting hot and causing pre-ignition.Valid theory? Link to comment Share on other sites More sharing options...
piman Posted March 28, 2012 Share Posted March 28, 2012 Hello Jonny, if the plugs are black, the carburettor mixture wants adjusting. I doubt that the exhaust blow will affcet the running in any way. Try reducing your idle speed to correct the running on?Alec Link to comment Share on other sites More sharing options...
piman Posted March 28, 2012 Share Posted March 28, 2012 Hello Jonny, if the plugs are black, the carburettor mixture wants adjusting. I doubt that the exhaust blow will affcet the running in any way. Try reducing your idle speed to correct the running on?Alec Link to comment Share on other sites More sharing options...
Glenn Posted March 28, 2012 Share Posted March 28, 2012 Hi Jonny,What you describe sounds pretty much standard on a PI engine running on carbs. What is the engine number? Has it an MG prefix? So, could be a high compression ratio and "dieseling" taking place. Link to comment Share on other sites More sharing options...
Greeks Posted April 4, 2012 Share Posted April 4, 2012 My rebuilt mark 1 pi engine on su has run on since day 1 Link to comment Share on other sites More sharing options...
Richard B Posted April 4, 2012 Share Posted April 4, 2012 Greeks wrote:My rebuilt mark 1 pi engine on su has run on since day 1It's the engines way of telling you to PI it ;) Link to comment Share on other sites More sharing options...
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