Catch Cans
Posted: Mon Jan 07, 2019 5:55 am
My Haflinger was built in 1973 so should have all the later changes to the engine that were made over the years but it doesn't.
The case is the correct crankcase but it has a number of older features like a No5 cam shaft, the early oil filter, the early oil filler and crankcase ventilation system. I believe that in the past the engine has had some sort of major failure and was rebuilt with lots of bits from another much older engine (which I have the remains of in my spares bin).
Putting aside major parts such as the crankshaft and camshaft one of the things I do not like is the crankcase ventilation is the old style - just a pipe from the oil filler cap down through the floor of the engine bay. Is OK at lower revs but when the engine has working hard the oil mist from the crankcase collects in the dump pipe and then drips onto the ground for quite a while after the engine stops. In the modern engine the crankcase ventilation pipe is routed to the airfilter housing where the oil mist is sucked into the carb and burnt in the engine. Problems with with system is that the oil mist can condense in the aircleaner making a mess or adding to carbon build up in the engine.
The way many modern vehicles deal with this is to have a catch can between the crankcase ventilation system and the inlet suction from the air cleaner. The catch can catches the oil mist while allowing the excess air from the crankcase (now free of oil) to go back into the engine.
So after that long bit of background, has anyone put a catch can on their engine and if so how have you found it.
Garry
The case is the correct crankcase but it has a number of older features like a No5 cam shaft, the early oil filter, the early oil filler and crankcase ventilation system. I believe that in the past the engine has had some sort of major failure and was rebuilt with lots of bits from another much older engine (which I have the remains of in my spares bin).
Putting aside major parts such as the crankshaft and camshaft one of the things I do not like is the crankcase ventilation is the old style - just a pipe from the oil filler cap down through the floor of the engine bay. Is OK at lower revs but when the engine has working hard the oil mist from the crankcase collects in the dump pipe and then drips onto the ground for quite a while after the engine stops. In the modern engine the crankcase ventilation pipe is routed to the airfilter housing where the oil mist is sucked into the carb and burnt in the engine. Problems with with system is that the oil mist can condense in the aircleaner making a mess or adding to carbon build up in the engine.
The way many modern vehicles deal with this is to have a catch can between the crankcase ventilation system and the inlet suction from the air cleaner. The catch can catches the oil mist while allowing the excess air from the crankcase (now free of oil) to go back into the engine.
So after that long bit of background, has anyone put a catch can on their engine and if so how have you found it.
Garry