DarrenW
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| posted on 8/9/06 at 08:43 AM |
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Crank case breather 2 - Pinto help
Ive read with gusto the threads about Pinto breathers. Im still having strange experiences with mine tho'.
Ive read this article but my engine seems to be different. http://hometown.aol.com/sarandrews/wateroil.htm
My engine is injected pinto lump (on carbs), 205 block. Connecting breather to carbs seems to work fine. I have however fitted a catch tank in
preparation for bike carbs.
Crank case breather is a round can onto which an outlet is pushed in. This uoutlet had a spring and plunger, both removed. Outlet now connected to
catch tank.
Oil filler cap has side pipe connection, this too now connected to catch tank.
Catch tank is simple affair, can with two inlets in side and outlet at top. K&N style filter fitted to outlet. Inside of can is empty. There is no
drain at base of can (i remove it and tip out the contents to empty it). After about 3 to 4 months of having tank fitted there is approx 1" of
liquid in bottom, its not pure clean oil, looks like what you would expect of condensed vapours.
During normal running i can often see vapours etc puffing out of the little filter, the filter is well sodden so of course ends up dripping and
running down outside of tank - messy etc. (i dont mean gallons every day, it takes a couple of weeks to warrant a quick wipe up).
1st Q - is this normal.
Ive noticed some oil drips on garage floor. After scraping sump a couple of times i thought i might have holed it. Closer inspection (sump is ok)
revealed oil has been running down dipstick tube and then down side of block etc low down. Again not huge qtys but enough for me to want it to stop. I
then read the article again;
Oil filler cap - mine is slightly fifferent but it say s to epoxy the bottom to seal it. I modelled this with poly bag - oil was seen to bubble up out
of dipstick tube! Bag removed as a bad idea.
Breather can - i dont have the Cortina type. Does this differ hugely from the Sierra type? With engine running and small outlet pulled out i can feel
air puffing out (increasing with revs etc) so no blockages there - is this normal.
My conclusions so far is that my engine is worn and crankcase resultant pressure is therefore more excessive than it should be. (I say this as i have
to keep eye on oil level quite a bit and regularly top up, could be unrelated) This could of course be totally wrong so im looking for inspiration /
advice from those with more experience please.
I guess one other point maybe unrelated - following sump modding i never know how much oil to put in - i always aim for mid point on dipstick now (i
have filled it to top mark before and for a few miles it kicks oil out as exhaust fumes).
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mookaloid
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| posted on 8/9/06 at 10:37 AM |
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Hi Darren
your experiences with seem very similar to mine. I find changing the breather filter on top of the can sorts out the crank case pressure - it seems to
need to be clean to allow the air to move through it.
There will be a bit of oil mist around the top of the tank - it's inevitable on an open system (as opposed to the closed system where the
breather goes into the inlet manifold)
If the filter gets too dirty it causes oil to be chucked out of the dipstick tube.
So change your filter for a cleaner engine bay 
Cheers
Mark
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DarrenW
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| posted on 8/9/06 at 11:08 AM |
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Im guessing since i used a K&N style filter it will be cleanable. What sort of filter have you used? Im guessing the bods that use beer can or
similar sometimes dont have a filter. I thought about putting some foam in the can but not easy to get in as its all welded up and will make emptying
harder.
Ref the Cortina style breather block - is this what you used? Any difference to the std Sierra type?
Should the dipstick be a sealed fit in the tube?
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mookaloid
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| posted on 8/9/06 at 11:28 AM |
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I'm using a pipercross filter pic here
I am using a straight through connection into the the block which I think was the sierra one. I have a couple of the cortina style (small flame trap
tank) ones but haven't seen the need to use one yet.
My dipstick isn't a sealed fit but I get no problems as long as the filter is clean.
Good luck
Mark
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mookaloid
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| posted on 8/9/06 at 12:10 PM |
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quote:
Originally posted by hicost
On the side of the block near the sump you may find a bolt type thing at a 45 angle, if you can undo this put a fitting in and then use an oil sep
tank. This way you can run the breather from the rocker and the breather on the other side under the carbs into the tank and any oil will then sep out
from moisture and run back into the sump.
I have my tank draining back into the sump but I didn't realise the plug you mention existed so I had a boss welded onto my sump. works fine
though, never have to worry about it.
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DarrenW
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| posted on 8/9/06 at 02:02 PM |
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Thanks for pic link Mark. I remember seeing it now. Very similar filter to mine. Ill try cleaning it.
I bet the Cortina breather was recommended as it may have the oil seperator built in.
Am i right in assuming that a worn engine could produce more crankcase pressure? This may be the main reason for mine being borderline. As i say when
connected to carn manifold i didnt notice any problems but i cant do this when i convert over to bike carbs. My design of catch tank may also be not
quite right. The inlets come in at the side near to the top. Outlet straight out of the top. Fumes and vapours may be forcing themselve out of filter
before theyve had chance to settle in the tank. Dave Andrews design used foam inside between the inlet and exhaust. Unfortunately i cant easily alter
mine now - but nowt is impossible!
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mookaloid
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| posted on 8/9/06 at 03:15 PM |
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A worn engine would produce more crank case pressure yes but it may not be your problem.
When I had the gummed up filter the oil spewed out of the dipstick right up the windscreen as soon as I removed it and fitted a new one all was well
again. Up to this point I was convinced that I had broken some piston rings or something.
Just try taking the filter off for a minute to see if it makes a difference.
Cheers
Mark
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