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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: Oil breather ECAS Could it be that all three gaps had lined up and was allowing pressure into the block?
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1987 2CV Special
2014 Suzuki Swift Sport
2015 Lexus NX300h
1966 Ami Break
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| December 7th, 2013, 8:31 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Oil breather ECAS Nelsthebass wrote: Could it be that all three gaps had lined up and was allowing pressure into the block? No set at 120 dg. everytime 
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| December 7th, 2013, 8:36 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: Oil breather ECAS Back to the shed, I'd forgotten about a box of M4 goodies. End gap for these new oil control rings in a used barrel is 0.55mm. Also found this... http://books.google.co.uk/books?id=p2L- ... mm&f=false M4 engine, new oil control ring by slcchassis, on Flickr
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| December 7th, 2013, 9:08 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Oil breather ECAS Lets not get side tracked. In terms of blowby, the 3 rings are in good condition not allowing any compression to pass. At the other end, no oil is passing upwards (to the compression chamber). The compression chamber is dry as bone. Therefore the blowby is no existence in this case. I'm pretty sure that rings can be eliminated in this case. Still the housing is filling up rather quickly 
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| December 7th, 2013, 10:09 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: Oil breather ECAS 2CViking wrote: Nelsthebass wrote: Could it be that all three gaps had lined up and was allowing pressure into the block? No set at 120 dg. everytime and they stay at that position for about 5 minutes of running - the rings do rotate during use
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| December 7th, 2013, 10:31 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: Oil breather ECAS Nelsthebass wrote: Is it possible for the rings to perform OK at the top end of the barrel - eg so you don't get blow by oil going into the combustion chamber and thereby no blue smoke through the exhaust - but don't make a good seal at the bottom of the stroke so that exhaust gases start to pressurise the engine and thereby blow oil into the filter box? other way round, wear is in the first 20mm or so of the swept area
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| December 7th, 2013, 10:33 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: Oil breather ECAS barrels look a bit polished - did you hone them before fitting the new rings?
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| December 7th, 2013, 10:39 pm |
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Bart
Firing on two.
Joined: February 12th, 2009, 6:17 pm
Posts: 316
Location: North
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Re: Oil breather ECAS 2CViking wrote: Lets not get side tracked. In terms of blowby, the 3 rings are in good condition not allowing any compression to pass. At the other end, no oil is passing upwards (to the compression chamber). The compression chamber is dry as bone. Therefore the blowby is no existence in this case. I'm pretty sure that rings can be eliminated in this case. Still the housing is filling up rather quickly I think blow by is (or can) be (much) higher under load. You only need to open the throttle a little to speed up the engine to 5/6000 rpm at idle. Slight throttle valve opening means a big/strong pressure drop over the throttle valve in the carb and low top firing pressure and relatively low blowby. So when you test your good engine breather in the garage, it can provide/keep crankcase depression. When driving under load you open the throttle further or complete, so lower dp on the throttle valve(s) in the carb with a higher top firing pressure in the combustion chamber. When driving under load with worn barrels and or rings the blow by could be higher than at idle testing (where your breather didn't show a problem) but now a lot of oil fumes are blown through the breather into your air filter. Maybe this helps. Didn't read the entire topic so if I misunderstood something/miss the point, sorry. p.s many of my friends have the ECAS breather and I haven't heard of any bad experience with them.
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| December 8th, 2013, 1:35 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Oil breather ECAS Bart there is no blowby OK?
Lets move on.
What is the solution?
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| December 8th, 2013, 1:56 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: Oil breather ECAS Bart, total agreement here...  Also, did we ever learn if this engine has 8.5 or 9.0:1 pistons? Bart wrote: I think any blowby is always higher under load.
Maybe this helps. Didn't read the entire topic so if I misunderstood something/miss the point, sorry.
p.s many of my friends have the ECAS breather and I haven't heard of any bad experience with them.
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| December 8th, 2013, 3:09 pm |
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