| ausmini https://ausmini.com/forums/ |
|
| PCV Valve cooper s https://ausmini.com/forums/viewtopic.php?f=2&t=95256 |
Page 1 of 1 |
| Author: | GundyGuy [ Fri Apr 21, 2017 5:05 pm ] |
| Post subject: | PCV Valve cooper s |
Can someone explain how this PCV valve should work Mine just seems to suck heaps even with the internal plunger all the way down Mine originally had no spring and i was given a cut down SU spring to use from a well known Mini Mechanic locally When the engine was out i thoroughly cleaned out the breather can on the tappet cover and fitted a new breather type oil filler cap |
|
| Author: | drmini in aust [ Fri Apr 21, 2017 6:24 pm ] |
| Post subject: | Re: PCV Valve cooper s |
Here you go.http://www.mgaguru.com/mgtech/engine/cv103.htm Modern PCV valves are much simpler. I now run a Toyota style PCV13, it works just as well. But my car is a bitsa, so no originality issues.  http://www.motospecs.com.au/assets/file ... itches.pdf [edit] scroll down to p17 for pics. |
|
| Author: | IndigoBlueCooperS [ Fri Apr 21, 2017 8:05 pm ] |
| Post subject: | Re: PCV Valve cooper s |
Interesting read Doc. So the normal Mini PCV relies on atmospheric pressure (through the small hole in the "top"). Do the Toyota ones work the same way? |
|
| Author: | drmini in aust [ Fri Apr 21, 2017 8:13 pm ] |
| Post subject: | Re: PCV Valve cooper s |
No idea, but they work fine. So do they on 99% of more modern cars. Edit There's a cutaway view and explanation here https://m.youtube.com/watch?v=UegCOOM3e_Q |
|
| Author: | miniron [ Sat Apr 22, 2017 10:35 am ] |
| Post subject: | Re: PCV Valve cooper s |
Modern PCV valves don't need a vented cap. The lower than atmospheric pressure in the crankcase sucks air in past the crankshaft oil seals. With the engine running it minimises oil leaks past the seals as well. Did the Cooper S really need a vented cap? The cap was supposed to be changed every 12000 miles. I've only ever bought one vented oil filler cap in nearly 50 years and it doesn't seem to have made any difference. RonR |
|
| Author: | GundyGuy [ Sat Apr 22, 2017 1:37 pm ] |
| Post subject: | Re: PCV Valve cooper s |
This PCV valve doesn't shut off completely when the valve is pushed all the way down So i guess it is fardookered Might have to invest into a new valve |
|
| Author: | drmini in aust [ Sat Apr 22, 2017 1:55 pm ] |
| Post subject: | Re: PCV Valve cooper s |
I don't believe it should totally shut off. The 4 grooves in the body limit the airflow at high vacuum. I have run 1275s with the Smiths valve for years, with and without a vented cap. Seemed to make no difference. My 1412 had a sealed cap and the 1360 a vented one. The test for it working is put your hand over the oil filler hole, you should feel vacuum. |
|
| Author: | GundyGuy [ Sat Apr 22, 2017 4:07 pm ] |
| Post subject: | Re: PCV Valve cooper s |
The write up you posted said this As the poppet approaches the valve seat it restricts air flow. The internal cavity of the valve body is then isolated from manifold vacuum and is exposed to the lighter vacuum level in the crankcase. If the poppet was to closed all the way it would stop air flow completely, |
|
| Author: | drmini in aust [ Sat Apr 22, 2017 4:18 pm ] |
| Post subject: | Re: PCV Valve cooper s |
I will test my Smiths one for shutoff tomorrow. |
|
| Author: | drmini in aust [ Sun Apr 23, 2017 3:50 pm ] |
| Post subject: | Re: PCV Valve cooper s |
With the valve pushed in, no it doesn't seal off. I can suck through it.  However it feels like there is a reed valve in there which sudden opens as you apply a little vacuum. The valve still works fine I have had it on a friend's 1310 for the last week. |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|