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19-02-2004, 05:46 PM | #1 |
AstinaGT Regular
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Oil return line, Is it needed?
Well, like the topic says..
I was just screwing around with the air box and was wondering if the oil return line was needed? It grimes up the intake pipe with oil, and i don't like it :P Can i just tap it off to one of those oil catch cans or whatever they are. |
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19-02-2004, 06:37 PM | #2 |
1ST BA TURBO MEMBER
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Oil catch cans are actually illegal if they vent to air at all.
I would still recomend having it return to the sump as quite a bit of oil does go through it. There is a sealed catch can that has a filter element (Usually kitchen scourer type stuff) which will return to the sump. I am dubious of bits getting into the motor that way. I want to run a airbox that I can have the filter from the catch can exiting into the airbox to be sucked into the airfilter but is running through 2 filters (1 can , 1 airfilter) and is also legal. Lastly have heard mention that the suction of the intake actually helps reduce positive crankcase pressure and by removing that suction actually places extra strain on the rings. Regards Mal
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19-02-2004, 08:11 PM | #3 |
Senior Member
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u want to copy my idea this time that will be a first and last no doubt....
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JynX 1994 Turbo BA Astina 200whp @ 12psi "If you cant drive fast with 90hp..... 900hp wont help you" |
19-02-2004, 09:26 PM | #4 |
AstinaGT Regular
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Yes most of the time a lot of peterol vapours will be getting sucked out of the crankcase prolonging the life of the oil! i would just clean out the line and change ur oil more often! If ur car is boosted the boost goes in both sides of the pcv system pressurising the crankcase thus there is less blowbye past the rings during combustion underboost giving u more power and saving ur rings! :lol:
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19-02-2004, 09:37 PM | #5 |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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I've got a similar issue with the 13B, to me it just meens that the apex seals get a little more oil and the engine lasts a little longer.
The question would be why is the oil coming so far up that pipe? The oil in the inlet sounds to be the symptom, you've got to find the problem inorder to fix it.
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My 'stina Hatch |
20-02-2004, 02:33 PM | #6 |
1ST BA TURBO MEMBER
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Under boost the PCV is closed so it is only the other end of the rocker which vents
oily air into the intake. Under vacuum the PCV opens up so you can get oil in the manifold under low acceration situations. I wouldn't try changing the PCV operation as it only opens when you are not under acceleration so doesn't affect performance and is a legal requirement. As for the other end the more the boost/acceleration the more the intake sucks in and the more oily air from the motor it sucks in. I have heard some of the NZ 323GTX guys getting up to half a litre of oil into their catchcan during rally's. I know my turbo has got a bit of oil in the intake from not having a catch can. Regards Mal p.s And yes Jimbo I am going to copy one of your mechanics idea's. Bout time with you copying my twin tips, using my old mags, buying the IC etc that I wanted you bloody wanna be !! Next you'll be painting you dash silver
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20-02-2004, 05:29 PM | #7 |
AstinaGT Regular
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Excess blowbye is caused by worn rings or apex seals, or the engine is operating well over spec causing excess blowbye past even new rings! I think u sould be able to get a presurised catch can, which is the best of both worlds!
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20-02-2004, 05:43 PM | #8 |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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The motor is less than 10,000km old and I believe it would be side seals, not apex. Am putting out 12-14psi (about double stock series IV but not OTT), the engine sits about 15 degrees lower in the aft due to conversion. I will take the sump vent from a different place, mill 5mm of the engine mounts and move the trans mounts up a little.
Problem then will be those changes will also alter the handling (hopefully for the better). Cars can be a little complex sometimes, change the engine to fix a problem and you affect the handling. :roll:
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My 'stina Hatch |
20-02-2004, 06:08 PM | #9 |
AstinaGT Regular
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ooh yes! mmm sould not make a difference as long as all the mounts r good and dont allow the trans to flex and hit the floor pan! Good luck with it! Sounds ace!
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20-02-2004, 06:39 PM | #10 |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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Relocating the mass of the engine down even 5mm will make a difference, even if it's only a small one. This will also move the bell housing down (maybe only 3mm) which should allow me to raise the rear of the trans up a little which will help even out the engine a little and keep the oil in the best part of the sump
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My 'stina Hatch |
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