>>CHOP<<
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« on: June 08, 2009, 10:05:18 PM » |
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Hi i would just like to ask if anyone has tried this...for those of you who are not afraid to meddle with your mean machine....
I removed the crankcase ventilation pipe..from the point of connection with the inlet manifold and plugged it with a rubber plug...i also plugged the pipe that i had just took off it....which left the crankcase vent just going directly to the air filter box...re adjusted the idle screw (cos it speeds up a little)....it also runs smoother and goes like a rocket...accelleration is awsome......not sure about the MPG...but by eck she goes well...
try it see what you think....and report back....CHOP
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matrox02
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« Reply #1 on: June 09, 2009, 12:45:54 AM » |
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photos?? your explanation is a little weird to me, and if you are talking about the vent that im thinking of.. its a big NO NO cos it forced pressure to build too excessively and pushes oil passed the ( all ) seals really fast...
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>>CHOP<<
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« Reply #2 on: June 09, 2009, 10:13:53 PM » |
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Dont know what you are onabout....do you have the normal (f10 engine) 4 cylinder 970cc sk410....if so its the pipe coming out of the rocker cover ..it goes to a " T " connector one goes to the inlet manifold and the other goes to the air filter box....
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matrox02
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« Reply #3 on: June 10, 2009, 12:35:42 PM » |
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erm.. yeah i thought it was that one.. and yeah it is a big no no.. well that is.. in all my experience, the worst effected by this was my Nissan laurel with a RB25DE + t mind you.. it could have been because of blow-by shouldn't do that if the engine is healthy.. but.. iv noticed the engine will run better... but not like it after a while, its normally better to put a independent filter/breather on the rocker cover, OR what you can do.. is get an oil catch can install kit, install that and then put the filter ontop of the catch can..( mind you all my knowledge is based on High performance engines
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>>CHOP<<
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« Reply #4 on: June 10, 2009, 05:38:24 PM » |
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works for me...there is no back pressure from the engine ...must be in good nick..any gasses that do pass the piston rings is sucked out via the air filter ..rather than the vacuume in the inlet manifold...which draws more air through the carburettor venturi...which in turn draws more fuel ...it isnt looking good for the fuel consumption though ..seems to be supping it....lol
maybe put it back in the near future...
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matrox02
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« Reply #5 on: June 11, 2009, 12:15:29 AM » |
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whoa hang on.. i think i get ur original post now.. so what you did is plugged the rocker cover straight to the air filter box? nah thats fine.. all day long, so you disconnected the t connector from the intake manifold? and plugged it.. nah thats fine too lol.. i can see why you got better performance through that lol
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Dell Boy
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« Reply #6 on: June 15, 2009, 08:29:16 PM » |
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Two strokes & rotary`s run on oil mist for lubrication. Cut down on the oil & the engine runs better. This is what in effect you have done by stopping the oily crankcase air from going straight into the combustion chamber which had been corrupting the petrol/air combustion mix. BUT, it is a legal requirement to recycle crankshaft gases plus your air filter will get clogged up. Change back I think. Derek.
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Dell Boy - The Rascal Specialist
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>>CHOP<<
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« Reply #7 on: June 15, 2009, 08:34:41 PM » |
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but the gasses are still getting re-cycled ...and if i put a hole and fix the breather into it...in the rubber connection between the filter and the carb then it wont clog up the air filter.....
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Dell Boy
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« Reply #8 on: June 15, 2009, 08:39:17 PM » |
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You can, but the oily air is still going into the petrol air mix. Derek.
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Dell Boy - The Rascal Specialist
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>>CHOP<<
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« Reply #9 on: June 15, 2009, 08:54:57 PM » |
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which is where it is going at the moment and she runs like a dream...
The underlying problem is the PCV valve ...which is the valve fitted in the inlet manifold where the cranckcase is vented to...it uses the vacuume to draw the gasses from the engine /mixed with air drawn from the air filter....this valve is only supposed to open when engine is ticking over and closes when at higher revs......but i have had this valve apart and seen how it works and it wasnt closing as it should...neither was all the five spare ones i have ....it is a spring loaded plunger that works on vacuume...so i have by-passed it and i am more than happy with the results...MPG still under scrutiny though....
like i said gasses are still being re-cycled through the pull of air through the air filter..but as you say this is oily air and will eventually bock air filter ..but moving its position to the rubber between carb and filter box will prevent this happening....
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TITCH
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« Reply #10 on: June 15, 2009, 10:51:37 PM » |
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I had to sit & work that out Chop, I see what you are saying now.
Would one of those fancy expensive oil filters work better.
Less chance of the oil atmospherics clinging so much if it isn't a paper element??
Yes I studied Nuclear Physics too (?@**!!?)
I think it's good that you work it out rather than just 'avin' a go'
Titch
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