Go Back   AstinaGT Forums > Performance & Technical > Performance & General Maintenance

Reply
 
Thread Tools Display Modes
Old 19-02-2004, 05:46 PM   #1
kemicalx
AstinaGT Regular
 
kemicalx's Avatar
 
Join Date: Sep 2003
Location: www.geelong.vic.au
Car: Toyota MZ21, BG Astina
Posts: 275
Send a message via MSN to kemicalx
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.
kemicalx is offline   Reply With Quote
Sponsored Links
Old 19-02-2004, 06:37 PM   #2
BigMal
1ST BA TURBO MEMBER
 
BigMal's Avatar
 
Join Date: Mar 2002
Location: Sydney
Car: BA Astina Turbo
Posts: 4,195
Send a message via ICQ to BigMal Send a message via MSN to BigMal
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
__________________
If you want wind in your hair add a Hairdryer !!!
BigMal is offline   Reply With Quote
Old 19-02-2004, 08:11 PM   #3
JynX
Senior Member
 
JynX's Avatar
 
Join Date: Dec 2002
Location: Sydney
Posts: 1,767
Send a message via ICQ to JynX Send a message via MSN to JynX
u want to copy my idea this time that will be a first and last no doubt....
JynX is offline   Reply With Quote
Old 19-02-2004, 09:26 PM   #4
ezin
AstinaGT Regular
 
ezin's Avatar
 
Join Date: Jul 2003
Location: melb
Posts: 416
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:
ezin is offline   Reply With Quote
Old 19-02-2004, 09:37 PM   #5
Cosmo Dude
コスモ
 
Cosmo Dude's Avatar
 
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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.
__________________
My 'stina Hatch
Cosmo Dude is offline   Reply With Quote
Old 20-02-2004, 02:33 PM   #6
BigMal
1ST BA TURBO MEMBER
 
BigMal's Avatar
 
Join Date: Mar 2002
Location: Sydney
Car: BA Astina Turbo
Posts: 4,195
Send a message via ICQ to BigMal Send a message via MSN to BigMal
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
__________________
If you want wind in your hair add a Hairdryer !!!
BigMal is offline   Reply With Quote
Old 20-02-2004, 05:29 PM   #7
ezin
AstinaGT Regular
 
ezin's Avatar
 
Join Date: Jul 2003
Location: melb
Posts: 416
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!
ezin is offline   Reply With Quote
Old 20-02-2004, 05:43 PM   #8
Cosmo Dude
コスモ
 
Cosmo Dude's Avatar
 
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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:
__________________
My 'stina Hatch
Cosmo Dude is offline   Reply With Quote
Old 20-02-2004, 06:08 PM   #9
ezin
AstinaGT Regular
 
ezin's Avatar
 
Join Date: Jul 2003
Location: melb
Posts: 416
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!
ezin is offline   Reply With Quote
Old 20-02-2004, 06:39 PM   #10
Cosmo Dude
コスモ
 
Cosmo Dude's Avatar
 
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
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
__________________
My 'stina Hatch
Cosmo Dude is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Funny things you've been sent lately... Rupewrecht Off Topic 2682 16-05-2016 05:31 PM
Ive Got A Oil Leak Near The Oil Filter On BA V6 But..... Noble323 Performance & General Maintenance 6 04-08-2006 09:46 AM
WTB - turbo oil return feed line M J For Sale/Wanted 0 10-02-2006 04:30 PM
Gearbox oil - High performance oil needed BigBoyLemonade Performance & General Maintenance 20 26-02-2003 11:54 AM
Oil leaking onto rocker cover JynX Performance & General Maintenance 3 20-12-2002 09:55 AM


All times are GMT +10. The time now is 09:17 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
2001- 2010 AstinaGT