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samfieldhouse
Firing on two.
Joined: February 11th, 2009, 12:32 am
Posts: 3324
Location: Chichester, West Sussex
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 Re: reniflard II I have the ye olde breather which has two of these:  Fitted under one of these:  . The 'spout' should go to the air filter. I fitted a CPD valve inline and removed the beaks which resulted in MASSIVE dumping of oil into my catch tank. I put the beaks back in and they seem to keep the oil then. The CPD valve does it's job and after 3000 miles since last August there's nothing to speak of in there.
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| November 22nd, 2013, 2:51 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: reniflard II Sam, if you look at the diagram in the first post of this thread, the breather is a two-stage device, with the first chamber being where most of the oil is condensed out of the gas which is being expelled from the crankcase. I'd guess that the original 'beak' valve provides that 'first stage' chamber on your engine.  ken p.s. Wasn't the CPD valve doing its job, rather than it is job? 
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| November 22nd, 2013, 5:50 pm |
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ChrisW
Firing on two.
Joined: February 21st, 2012, 9:01 pm
Posts: 1136
Location: Avranches, Sud Manche, France
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Re: reniflard II ken wrote: And at full chat/full load, which is when a 'pressurised' crankcase is going to make itself known? Similar scenario to that of ignition timing; what's happening at tickover isn't of much importance, it's what's happening when the engine is really working for its living which counts. I once fitted the manometer inside a car, so that it could be monitored by the passenger as the car was driven. Anyone else tried this? ken Yes - but if you do not have much to start with then it is worse at full rpm. This engine had oil leaks everywhere with the old fucked reniflard but now zero leaks etc... ChrisW wrote: 6cm of vacuum is not a lot - on mine I have 40cm at idle
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| November 22nd, 2013, 9:55 pm |
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Taskos
Firing on two.
Joined: February 22nd, 2012, 10:34 am
Posts: 418
Location: Greece
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Re: reniflard II I don"t get it.
How is "the excessive 'blowby' past the piston rings" affecting the sulprus of oil?
What's the theory?
Mind that my configuration includes an extra inline check valve.
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I've Been Wrong Before.
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| November 22nd, 2013, 10:37 pm |
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Nelsthebass
Firing on two.
Joined: October 5th, 2009, 8:22 pm
Posts: 1415
Location: Stone, Staffs
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Re: reniflard II Is it not that the exhaust gases passing by the rings pressurise the oil system which the breather can't cope with.....?
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1987 2CV Special
2014 Suzuki Swift Sport
2015 Lexus NX300h
1966 Ami Break
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| November 22nd, 2013, 10:57 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: reniflard II Taskos, when an engine is in good condition, the amount of air which needs to be expelled from the crankcase during each engine revolution in order to maintain a vacuum inside the crankcase is quite small. However, if the seal between the piston rings and the barrels is poor, there will be more gas entering the crankcase past the pistons, so the breather needs to pump more air out to maintain the same vacuum. The air inside the crankcase will always be laden with oily vapour, and the more air that passes through the breather, the more oil that will go with it... Don't forget that the average pressure above the pistons in a 2CV engine is probably 'around' 120 psi. It may only reach 150 psi during the compression stroke without the mixture being ignited, but in the working cycle the peak pressure will be closer to 750 psi... ken Taskos wrote: I don"t get it.
How is "the excessive 'blowby' past the piston rings" affecting the sulprus of oil?
What's the theory?
Mind that my configuration includes an extra inline check valve.
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| November 23rd, 2013, 12:00 am |
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Taskos
Firing on two.
Joined: February 22nd, 2012, 10:34 am
Posts: 418
Location: Greece
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Re: reniflard II Thanks ken.
So a compression test will reveal the actual state of piston rings and barrel?
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I've Been Wrong Before.
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| November 23rd, 2013, 1:42 am |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: reniflard II Hi Taskos, almost there; a compression test is useful when assessing the general condition of an engine's top end. ( the pistons, rings, barrels and valve gear) However a leakdown test is much more useful when it comes to finding the actual source of problems in those areas, if any exist... ken Taskos wrote: Thanks ken.
So a compression test will reveal the actual state of piston rings and barrel?
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| November 23rd, 2013, 2:45 am |
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Taskos
Firing on two.
Joined: February 22nd, 2012, 10:34 am
Posts: 418
Location: Greece
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Re: reniflard II I'll run a compression test for a start.
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I've Been Wrong Before.
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| November 23rd, 2013, 9:23 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: reniflard II Don't forget, hot engine & wide open throttle... Taskos wrote: I'll run a compression test for a start.
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| November 23rd, 2013, 10:52 pm |
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