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Old 08-23-2013, 03:27 PM   #26
jockeygolfs
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Also, I am running a PTE6466 turbo on ETS Rotated kit.
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Old 08-25-2013, 03:53 PM   #27
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Ok so I connected my heads back to the AOS. I put a tee right at the top of the AOS and ran a 5/8 and 1/2 hose to my intake.
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Old 08-25-2013, 04:54 PM   #28
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crawford themselves actually disconnect the outlet of their AOS and vent it to atmosphere under race conditions. i don't run huge boost but i do have experience with it.

i actually plumbed the return line of mine to run instead of down into the top of the crankcase (which is also used as an outlet) straight down into the 2nd bung/hole on the killer B sump. and my engine STILL chewed through oil.

my next trick is going to be to run dual catch cans - one for the heads, one for the crankcase and then run their two separate exit lines to the compressor inlet. said cans will be stuffed full of steel wool to act as SOME kind of filter media.

we'll see how often i have to empty them. i'm not really convinced any of the AOS's out actually work under any kind of decent load.
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Old 08-25-2013, 07:29 PM   #29
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Quote:
Originally Posted by vicious_fishes View Post
and my engine STILL chewed through oil.
The engine is consuming oil? Under what conditions? How much oil?

If you've tried different setups and are still having problems, you might want to consider that maybe you've got excessive blowby cause by another issue.
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Old 10-12-2013, 07:32 AM   #30
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What other causes could there be w oil loss even though I have fantastic leak down and compression results.
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Old 10-12-2013, 08:08 AM   #31
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valve guide seals. crank case blowing out oil through whatever system you have.

hows the tb look? dry?
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Old 10-12-2013, 08:19 AM   #32
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Wouldn't valve guide seals leaking not hold pressure during leak down or compression?

I have gone back to plumbing my crank case and heads to my Crawford AOS. The AOS is then vented to atmosphere with a long hose that discharged below the car.

I did have the heads plumbed directly to my intake and my crank case to the AOS and then to my intake. There was a noticeable amount of oil in the heads hose. No oil in the crank case hose.
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Old 10-12-2013, 08:38 AM   #33
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The leak down test wouldnt really show the valve guide seals as technically they are of course later in the assembly....

Also, any hoses on the intake pipe to turbo will def suck up oil on high boost. Always want the inlet to be void of anything but a filter !! The aos should help. IF your still eating oil its very simple.

turbo, rings, valve guides, or oil ring on piston. that is assuming you arent spitting oil out our crankcase vent setup (aos vent) and your not burning oil by sucking it through your intake from thr crankcase vents (sounds like aos is hooked up there)
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Old 10-12-2013, 08:39 AM   #34
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plus on the valve guide seals sometimes they are funny and leak when cold/car has been sitting but seal later when car is hot or vice versa
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Old 10-12-2013, 08:45 AM   #35
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The leak down test wouldnt really show the valve guide seals as technically they are of course later in the assembly....

Also, any hoses on the intake pipe to turbo will def suck up oil on high boost. Always want the inlet to be void of anything but a filter !! The aos should help. IF your still eating oil its very simple.

turbo, rings, valve guides, or oil ring on piston. that is assuming you arent spitting oil out our crankcase vent setup (aos vent) and your not burning oil by sucking it through your intake from thr crankcase vents (sounds like aos is hooked up there)
I had the turbo inspected by Precision, it is a 6466, and they say it is fine. They did say the crank case needs to have suction or else the pressure could cause the oil not to drain and then push through the seals.

I don't see puffing smoke out of the oil filler. I get a dark smoke when going wot when I had the connections to the intake. Hopefully there will be less or none now. I haven't driven the car yet.

Oil rings can go but still hold compression if the main ring is still intact right?
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Old 10-12-2013, 10:08 AM   #36
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Well your first and second compression rings could be ok giving you decent compression/leakage results. The oil control rings could be fubared so they arent properly scraping enough oil off the walls when the piston is moving down.
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Old 10-12-2013, 10:25 AM   #37
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Well that would suck.
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Old 10-12-2013, 10:36 AM   #38
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Mine isn't crazy high #'s but at over 500whp I just eliminated the entire factory setup left the balance tubes but the other two head vents and baffled case tied together and to my exhaust scavenge setup.
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Old 10-12-2013, 10:38 AM   #39
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How bad is bad to not have neg pressure in crank case?
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Old 10-12-2013, 03:25 PM   #40
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I'm trying to get the proper parts for my build (closed deck 2.3l, 35R, built heads) and have purchased the dual can moroso set-up. Do you think this will be able to keep up? Currently I'm using the Grimmspeed unit which I'll be dropping in favor of something more capable. The IXIZ unit is really nice...just wondering if the Moroso set-up would suffice.
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Old 10-12-2013, 03:33 PM   #41
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Quote:
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How bad is bad to not have neg pressure in crank case?
like i said above, crawford actually disconnect the vacuum for theirs under race conditions.

as long as the crankcase is at least vented you're ok. if it's in any way sealed, big problem.
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Old 10-12-2013, 04:01 PM   #42
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I can see a race team doing that since they will be replacing blocks etc often. My car is a DD. built w Cosworth pistons and Rods. I don't plan on refreshing for at least 50,000k
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Old 10-12-2013, 09:42 PM   #43
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I never put vacuum on my crank case. But I also never get any smoke or oil consumption. If I do, at my earliest convenience Id pull the motor and go through it.

...if its burning oil...its really as simple as valve guide seals, turbo, or something else internally. Id vote for oil rings. and def after hearing your using cosworth slugs.
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Old 10-12-2013, 11:31 PM   #44
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Is there a known issue w cosworth oil rings?
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Old 10-12-2013, 11:35 PM   #45
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....forget I said that^^. ANd not exactly. Just havent heard or seen much good from them.

def hope you figure it out soon.
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Old 10-13-2013, 08:58 AM   #46
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With anything we build over 500whp we use a Peterson can and no pcv. -12 port to the block and -8 to the heads. VTA on the top of the can.
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Old 10-13-2013, 09:42 AM   #47
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^ nice part. I have heard of other ppl saying the same stuff about them. I never use the pcv period lol. ANd i do my best to use as big as possible vent lines.
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Old 10-13-2013, 11:16 PM   #48
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Quote:
Originally Posted by sidewayz View Post
With anything we build over 500whp we use a Peterson can and no pcv. -12 port to the block and -8 to the heads. VTA on the top of the can.
Just checked one out... Is this the one you are referring to?

https://store.nexternal.com/vacmotor...p27direct.aspx
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Old 10-14-2013, 08:10 AM   #49
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Old 10-15-2013, 02:50 PM   #50
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Best combo is to run the Crawford AOS; then run the top line of the AOS to a Peterson CC -12 line side; then run the Peterson -8 line to a Vibrant exhaust CC vent fitting.
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