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| Crankcase breathers https://www.ausmini.com/forums/viewtopic.php?f=2&t=19581 |
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| Author: | Gilly [ Thu May 25, 2006 8:47 pm ] |
| Post subject: | Crankcase breathers |
I was wondering what would be ideal for a breather on a Re-13 big block engine? At the moment I am only running the breather from the block side plate into the HS6 base. I feel this might not be sufficient and I might need a pcv valve and another breather into the inlet manifold. Has anybody got pics of their pcv valve or breather set ups and any suggestions 
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| Author: | drmini in aust [ Thu May 25, 2006 8:50 pm ] |
| Post subject: | |
Here is my setup on the 1360, for road use- it works well, no problems. For track days I remove the PCV, plug the manifold connector, and run 2 hoses into a catch tank. The 2nd one comes off that brass fitting on the rocker cover. I find it adequate, the bottle gets practically nothing in it at the end of day. The 1L `catch tank' has 2 vent holes 7/8" dia. 
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| Author: | Gilly [ Thu May 25, 2006 9:01 pm ] |
| Post subject: | |
Nice Doc So I suppose ine is very inadequate! Can I use a pcv valve from another car? Any suggestions on a donor? Also my rocker cover has no breather neither the flywheel housing so will I need another source for engine ventilation or can I just Tee of the one I have straight into the manifold where it has the tap for th brake booster. Will get a pic up soon. |
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| Author: | drmini in aust [ Thu May 25, 2006 9:09 pm ] |
| Post subject: | |
Yes you can go from the side cover breather (if S block) into the inlet manifold, just tee in where the booster is. But you WILL need a PCV on there. Too much vacuum otherwise. The Smiths PCV valve modulates the breather restriction depending on the amount of manifold vacuum. Not all those from other cars do this. <edit> The breather shown in my pic is an S one, modified to fit on the flywheel housing breather flange. <edit 2> if by `block side plate' you mean the oil pump flange, I had trouble running mine from there. Crank chucked too much oil at it, the PCV sucked it all up over 4500... 
Might work, if you baffle it. The gauze inside the breather won't stop this. |
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| Author: | Gilly [ Thu May 25, 2006 9:17 pm ] |
| Post subject: | |
Out of curiosity does this "high vaccum" cause a rise on the idle of the motor when warm? Just wondering why my idle rises up to over 2000 when the motor warms up 
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| Author: | drmini in aust [ Thu May 25, 2006 9:19 pm ] |
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Gilly wrote: Out of curiosity does this "high vaccum" cause a rise on the idle of the motor when warm?
Just wondering why my idle rises up to over 2000 when the motor warms up Oilz is thinner.... or your throttle shaft (SU) worn.
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| Author: | Gilly [ Thu May 25, 2006 9:24 pm ] |
| Post subject: | |
Hmmm I took a punt with the auto trans fluid. Might try a low viscosity engine oil. Thanks Doc 
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| Author: | drmini in aust [ Thu May 25, 2006 9:26 pm ] |
| Post subject: | |
I'm talking oil in the motor, not the dashpot. 
If running 1 SU, just use the breather on the side of the carb, it's a vac port. This is an old pic, I now run it to the vac ports of both carbs. 
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| Author: | Lillee [ Thu May 25, 2006 9:27 pm ] |
| Post subject: | |
Yeah same set up as mine cept I run it of the tappet chest cover breather instead. I find that idle is nice and stable |
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| Author: | Roundy [ Thu May 25, 2006 9:47 pm ] |
| Post subject: | |
I run two, one to each carb 
If i start to take to track days i will put a third one in the tappet cover |
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| Author: | Mini68 [ Fri May 26, 2006 6:58 am ] |
| Post subject: | |
I have 2 breathers on mine. 1 from the back of the rocker cover and one from a separator attached to the fuel pump hole at the back of the block (1100s). At the moment the one from the fuel pump hole goes to another port in the back of the rocker cover where it can dump any oil that it spits up. There is a PCV between the rocker cover and the manifold port. I have had them both go to a catch tank and breather but it is a little fumey that way. I also found that taking a port from the rocker cover I needed a non breathing rocker cover cap otherwise it would run too lean no matter how rich the carbie was. 
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| Author: | hbr [ Thu Oct 26, 2006 1:44 am ] |
| Post subject: | |
Hey DrMini, why do you change to catch can on track days? |
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| Author: | jbeenz [ Thu Oct 26, 2006 6:44 am ] |
| Post subject: | |
so if his engine blows itself to pieces, the oil from the breathers ends up in the can, not under somone elses tyres
um, can somone explain the PCV valve? i assume it stops liquid, just letting fumes into the intake and thus reducing emmisions? Never got them here. |
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| Author: | kiwiinwgtn [ Thu Oct 26, 2006 6:58 pm ] |
| Post subject: | |
Hi Kevin, could not help notice you are running twin 1.5 su's a couple of questions. What manifold and needles are you using Cheers Kiwiinwgtn |
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| Author: | drmini in aust [ Thu Oct 26, 2006 7:42 pm ] |
| Post subject: | |
hbr wrote: Hey DrMini, why do you change to catch can on track days?
For a VERY good reason...
The PCV is connected to the breather atop the flywheel housing. Actually these suck fumes from directly above the drop gears... mind you there is a baffle in there.. of sorts. Anyway, on the sole long, sharp LH bend at Wakefield Pk (the fish hook) at 7-8K in 2nd gear it throws so much oil up off the drop gears that with the PCV's suction the breather is overloaded with oil.  It gives a very good impression of JB007.
A catch tank solves this, as there is no suction, only venting. 
But catch tanks or Blingy filters make for a smelly car in daily driving, that's why normally I run the PCV. |
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