Normbourne Posted December 27, 2013 Share Posted December 27, 2013 Hey lads, This is probably a silly question, and is probably a very basic question. ( for some at least) On the oil filler pipe and on the rocker breather there is a tube connection, in the past I have always connected these to a vacuum connection, but it then occurred to me that thi cannot be correct, in that wouldn't the fuel mixture be weakened.....? Any clues Fellahs ...? By the way we are talking about an early series 3, 4 cyl. Petrol engine. Thanks, Norm Quote Link to comment Share on other sites More sharing options...
Tanuki Posted December 27, 2013 Share Posted December 27, 2013 The breather should connect to the vacuum-side of the inlet manifold, through a vacuum-control-valve: http://www.englishparts.com/images/parts/aiap/fullsize/PVC-VALVE-13H5191.jpg This valve closes down when the engine is at idle so it stops the air-leak weakening the mixture. At larger throttle openings the valve opens - but the additional air-flow then occurring through the valve is small compared to the volume of air/fuel going through the carb so the 'diluting' of the mixture is marginal. Quote Link to comment Share on other sites More sharing options...
Pepé le Pew Posted December 27, 2013 Share Posted December 27, 2013 If you connect them to intake manifold then you are correct,it will give a leaner mixture. But if you connect them to intake of the carb its no problem. Cheers, Eric. Quote Link to comment Share on other sites More sharing options...
dm7288 Posted December 29, 2013 Share Posted December 29, 2013 My 1972 2.25 petrol has the breather pipe from the oil filler connected to the vacuum control valve, the pipe from the valve then connects to the sandwich plate between the carb and the inlet manifold. The rocker cover breather pipe connects to the air pipe that goes between the oil bath air filter and the top of the carb. Quote Link to comment Share on other sites More sharing options...
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