GrimmSpeed Air/Oil Separator - Product Release
You want an AOS that breathes both the Heads and Crankcase? Check.
You want a compact AOS that will work on all models? Check. You wan a AOS that is not overpriced? Check. https://www.grimmspeed.com/catalog/p...roducts_id=191 http://www.grimmspeed.com/images/pro.../aos_600_1.jpg PRICE: $299.99 An Air/Oil Separator has one job, remove the oil from the engine ventilation system so the oil does not get sent through the intake system. The GrimmSpeed AOS is unique as it allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your system, the result is 1) reduced fuel octane 2) higher chance of engine knock(detonation) 3) worse emissions 4) higher oil consumption. Our AOS will solve all of these problems. In GrimmSpeed fashion, we have made a very compact unit that packs a powerful punch(and looks good while doing it)! No more having to check/empty your catch can and refilling your oil. The GrimmSpeed AOS coalesces oil without using a mesh media. Mesh medias can cause contaminates to collect and build up resulting in possible sludge. Our AOS is self maintained so you can just sit back, stop worrying, and enjoy driving your car! Replaces oil cap for a self-sufficient design that requires ZERO maintenance! http://www.grimmspeed.com/images/pro...iagram_600.jpg http://www.grimmspeed.com/images/pro.../aos_600_4.jpg http://www.grimmspeed.com/images/pro.../aos_600_2.jpg http://www.grimmspeed.com/images/pro.../aos_600_3.jpg http://www.grimmspeed.com/images/pro.../aos_600_5.jpg Installed pics... http://www.grimmspeed.com/images/pro...nstalled_6.jpg http://www.grimmspeed.com/images/pro...nstalled_7.jpg https://www.grimmspeed.com/catalog/p...roducts_id=191 Justin |
Is that thing as tiny as I think it is? It doesn't screw into the crank breather on the top of the block does it?
I've got a massive GST donkey-kong barrel AOS on my WRX... if this does the same job, that's mighty impressive. |
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http://www.iwsti.com/forums/how-inst...separator.html The extra line input makes it superior to the Prova in that it has inputs from both the crankcase and the valve covers. I personally would be skeptical that turning the oil filler tube into the equivalent of a catch can that drains back to the driver-side valve cover is equal to systems by Element Tuning, Crawford, and Pro-Vent, but maybe. |
It looks cool and is way cheaper than the Prova unit. The Prova unit still uses the stock oil filler cap where as this unit appears to replace it with a cooler looking cap. However, this cap looks like you will need a socket if you would like to put oil in your car and I don't always carry one with me.
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Shouldn't an AOS act like a catch-can that takes oil out of the blow-by gasses to drain back to the pan and then either release the oil-less gas to atmosphere or send it back to the intake to be burnt? We've pounded on this topic quite a bit already... especially here. Are we missing something about how this stuff works, because I'd be concerned running this AOS on anything that might have significant crank pressure from blow-by or anything that's going to see significant lateral Gs. |
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So this setup is basically the top type of catch can in this picture: http://www.seccs.org/gallery/Car%20P...catch-cans.jpg ...but with a drain-back to the heads. The problem is that there is likely going to be the possibility of crank pressure blowing out the heads (and thus pumping oil out the heads) because the crank breather is the same size as the valve breathers. I don't know how good that separator is... if it can't handle a heavy stream of oil, you may be blowing oil right into the intake. Probably not going to be an issue on a street car, but on a race car that can sustain 1+ lateral G's, I'd be concerned, especially if I had WRX heads with the single breathers. |
The way it looks like it works is... The blow-by comes in the the two lower/outer nipples and then is funnelled down a port to the filler tube. It then separates (prolly not completely) and returns up the device and exits the higher/middle nipple and out to the intake tract. It is clever, but no more technically complex than a decent catchcan.
http://www.grimmspeed.com/images/pro.../aos_600_5.jpg |
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Justin |
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Justin |
I do carry the key for my lug nuts so if you make me a cap that fits the key, we might be in business. :lol:
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Justin |
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Just because all that oil coming out of the heads will get pumped back into the driver's valve cover doesn't necessarily mean it's not a problem. IMO, if you've got a car that needs a drain-back catchcan/AOS, you've probably also got a car that has a big turbo and see's lots of lateral G's that needs separate crank and valve breathers. |
Seems to me the breather line off the driver side head becomes superfluous, as the filler tube becomes a big breather line basically instead. Most of the blow-by in the DS valve cover will take the path of least resistance and head straight up the filler tube. Probably doesn't hurt to still run the VC breather lines together though.
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Oh and i'd like to add we had this in 15 different testers hands for the last 6 months on all types of setups ranging from stock setups to 500hp setups and it worked very nicely. Justin |
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and just to reiterate..no worries at all knucklesplitter, its just that i got done spending a TON of time and money designing this product and the last thing i want is to be accused of replicating another product. so maybe i'm a bit sensitive right now ;)
Justin |
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Also. 5/8" ID is 50% larger in area than 1/2" ID (0.307 in^2 vs. 0.196 in^2). That's pretty significant. And that restrictor is not in line with the breather, it's only in line w/ the PCV, is it not? |
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Either way... I don't have a PCV any more as it is... just a giant AOS that vents the crank and valve covers to atmosphere. Everything else I tried just didn't keep up with the crank pressures and G's the motor was seeing at the race track. |
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