2b_pablo
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| posted on 21/1/08 at 02:09 PM |
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oil return pipe to sump
Guys my pinto is chucking out some oil when on track so Im thinkng of fitting a return pipe from the catch tank to the sump.
Ive got the oil cap breather and the free flowing crankcase breather both going into the catch tank. I would then drill and tap a fixing in the tank
for a retun pipe to the sump.
Im wondering is this a good idea and if so where is best to fit the return fixing to the sump? Its an alloy RS2000 sump. Id imagine around the front
on the passenger side would be ok.
do many people have to fit a return? The engine was rebuilt not too long ago so it *should* be ok but its getting compression tested etc just in
case.
thanks all.
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NS Dev
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| posted on 21/1/08 at 02:11 PM |
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mmmmm tricky. We have had issues in the past on vauxhall engines trying to do this, and ended up blowing oil UP the drain pipe, and made the problem
worse.
Do you have a decent gauze in your existing crankcase vent?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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2b_pablo
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| posted on 21/1/08 at 02:19 PM |
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its a cortina trap. I was going to replace it for a straight through elbow from Burton tho (mainly for neatness)
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DarrenW
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| posted on 21/1/08 at 03:17 PM |
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For every post that says you can do it there will be 100 that say dont. Only you will know what is being caught in the catch tank.
You say it does this on the track, presumably on the road its OK. When just on the road does it collect the foul smelling horrid looking liquid that
most people would say dont return to the sump?
On track what sort of qty are you talking about? A tank full every 10 laps or tank full in a full session?
I had a drain back to oil gallery when i was having a lot of bother and it did force pressure back up the line and cause the oi in tank to be
splattered everywhere. I concluded then that the next best place to trial would be under the running oil level in sump - however it was excesive oil
that was the issue. So far its been no trouble since fixing the dipstick length.
Assuming you dipstick is correct etc - ive heard of people reporting they need to run the level between lower mark and middle otherwise oil is chucked
out if closer to top mark. Could it be that your engine is trying to find its natural level?
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2b_pablo
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| posted on 21/1/08 at 03:20 PM |
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last trackday it was throwing out about a litre for each session. 
I filled it with 4.5L and a new filter a few days beforehand so I know there was the right amount of oil in it (I read your thread at the time).
It might be a symptom of some other problem but if it was the kinda thing that was a good idea Id do it, but maybe Ill wait to see what my mechanic
makes of the engine once its down to him.
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jacko
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| posted on 21/1/08 at 03:21 PM |
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NO not a good idea
Darren W on here had the same problems + his dip stick was the wrong length
And why put old mucky oil back in a engine ?
Graham
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02GF74
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| posted on 21/1/08 at 03:27 PM |
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my 2p worth and if follows wot DW is saying is that if this is happening on track, the incredible acceleration, cornering and braking is sloping the
oiul round the sump so it is being caught by the crank and splashed out of the block (same as having too much oil).
Do you have baffled sump? Do you have windage tray? Can you put some restriction before the breather to allow venting but to catch oil e.g. gauze or
some deflection plate?
If it we me, I would look at those first otherwsie we are back to the refilling of sump via the oil catch tank debate. ^^^^ ooh look,
it's started !! 
[Edited on 21/1/08 by 02GF74]
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snapper
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| posted on 21/1/08 at 07:34 PM |
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Common cause of too much oil blowing in to the catch tank can be unbaffled filler neck.
There is hole in the block rear right with a 12 to 15mm plug, youcan take that out and use it as a drain.
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DarrenW
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| posted on 22/1/08 at 09:20 AM |
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Yeah - filler neck on my rocker cover is in std position with factory baffle in place and the cap has the mesh inside.
Sump could be a cause.
Ive also heard of people, through experience, finding out that if they only fill to a certain point on dipstick all is fine, but a bit over and it
gets messy.
I really dont think you have anything intrinsically wrong, just fine tuning required. In theory your engine should be healthier than mine (newer) so
dont suspect that at first.
When you placed 4.5 litres in with filter change just before track session were you sure the sump was empty? Everyone will have differing qty's
of oil due to sump mods but in essence the height of oil will be approx similar. On mine its between 4 and 4.5 litres. Its still possible that 4.5
litres in = 4.7 litres total (cos of sump residuals) = a touch too much. Assuming your tube and dipstick are correct (inc the marks) where are you
running the oil level (top, middle or bottom)?
Cortina trap - fitted straight into block or ontop of the can the PCV sits in? (its a tight fit under carbs but can be done depending on exact
manifold etc). Mine was iffy in the PCV can but a neater install and better operation directly into the block. I didnt realise that the can the PCV
sits into as removable.
[Edited on 22/1/08 by DarrenW]
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2b_pablo
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| posted on 22/1/08 at 09:31 AM |
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cortina trap is straight into the block
I see your point about sump level I just emptied it via the drain plug.
as for my dipstick it seems to give bizzarre readings.
been that long since Ive driven the car (around 4 months now) that I forget exactly what it was doing.
should be going again soon tho so Ill investigate further then. just fill it until it hits the middle of the dipstick or something.
thanks for all the replies at least I know now not to fit the drain to sump until I check a few more things out first.
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DarrenW
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| posted on 22/1/08 at 11:09 AM |
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I have the same problem - if i havent driven the car for a while i forget the details of the little quirks
What you have descired does sound very similar to my oil overfilling experience. Since ive dropped the level on the road there has been only the
slightest amount of condensed vapours in the tank (which are not pleasant!)
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