Crankcase Evacuation Systems for TIII's
I posted a discussion over in the main engine forum that kind of stopped and I never got my questions answered. Here is the discussion:
http://www.turbo-mopar.com/forums/sh...ion-Discussion
How are you guys with the large horsepower TIII's and high boost engines venting your motors. I know I see lines coming off both valve covers, but what prevents oil for accumulating in the catch can? Seems like the oil is going right out of the engine and into the can, there is no seperator like the stock system. How are you handling the stock PCV system?
I want to get my car set-up right.
Thanks
Re: Crankcase Evacuation Systems for TIII's
Quote:
Originally Posted by
DoubleD
I posted a discussion over in the main engine forum that kind of stopped and I never got my questions answered. Here is the discussion:
http://www.turbo-mopar.com/forums/sh...ion-Discussion
How are you guys with the large horsepower TIII's and high boost engines venting your motors. I know I see lines coming off both valve covers, but what prevents oil for accumulating in the catch can? Seems like the oil is going right out of the engine and into the can, there is no seperator like the stock system. How are you handling the stock PCV system?
I want to get my car set-up right.
Thanks
Stock PCV routing basically, but with a Supra check and w/o that plastic baffle piece. As far as the oil, I may end up running it to the exhaust, but otherwise its just drain when full. If it goes out the breathers so fast that you are running out of oil, you have a bigger problem.
Re: Crankcase Evacuation Systems for TIII's
I'm sort of up against this issue now. I recently sold a '91 Spirit R/T to a friend and he has since upgraded the intercooler, turbo (50-trim/stgIII), fuel injectors, 3 bar MAP, SBEC etc currently pushing 20 psi at WOT.
Our plan so far is to retain the function of a the stock PCV as much as possible. Since the stock airbox is gone, we plan to weld a 3/8" bung into the pre-turbo intake piping so that hose will go there instead of the factory airbox. We may add the check valve too..
Other than that, I have a set of valve covers that I've had modified with 8AN weld-in bungs on the rear end (driver side). I have an ATP catch can and plan to vent both valve covers to that to handle crankcase gasses while in boost. We'll see how it goes from there..
http://www.atpturbo.com/mm5/merchant...egory_Code=BCS
Re: Crankcase Evacuation Systems for TIII's
Here's what I've found; If the hoses/ lines your using are too small, or the filters for that matter, you will get a lot of oil in your catch can as your not "venting" the mtr enough and pressure it still building and moving oil out with that pressure.
IF your hoses and filter/ filters Are the right size, you will get almost No oil in the catch can because the mtr has no chance of building any pressure. It's venting as fast or faster than any pressure can build.
This was my theory years ago and I've never had anything more than oil residue in my catch box/ can over the last 6-7 years.
Re: Crankcase Evacuation Systems for TIII's
Any disadvantage to not running the plastic baffle piece? I don't think I will have room with my new fuel set-up. I would just run the hose from the block up to a tee, 1/2 would go to a breather filter and the other half to a Supra PCV Valve and then back to the Intake.
Re: Crankcase Evacuation Systems for TIII's
After a few comments and some late night thinking, I came up with this design at work. This will allow the fastest removal of pressure since there is a direct line from the block to the filter, then the gasses can be sucked out via the side of the tee, not much oil should make its way into the intake with this set up. I may make it with the machined center and pipe threads or use a 5/8" 90 and a tee with some hose.
http://i84.photobucket.com/albums/k6...ps963f8098.jpg
Re: Crankcase Evacuation Systems for TIII's
You may have a problem with moisture getting pulled in through the filter. If you do you may want to run a length of hose to try and prevent that.
Re: Crankcase Evacuation Systems for TIII's
Very good point, wouldn't the filter keep moisture from being drawn in? If that is the case, I could put a one-way check valve between the tee and the filter to make sure no air is drawn through the filter.
Re: Crankcase Evacuation Systems for TIII's
This set-up looks identical to the stock TIII setup minus the labyrinth. The stock PCV rubber fitting connects the block vent to the PCV valve with fresh air either open like yours (and all of mine also) or back to the airbox.
Re: Crankcase Evacuation Systems for TIII's
Quote:
Originally Posted by
DoubleD
Very good point, wouldn't the filter keep moisture from being drawn in? If that is the case, I could put a one-way check valve between the tee and the filter to make sure no air is drawn through the filter.
You would need a valve that requires very little flow to open otherwise you would build pressure.
Re: Crankcase Evacuation Systems for TIII's
Finished my new pcv set up, i hope this theory works.
http://img.tapatalk.com/d/14/04/04/9ysa9y5y.jpg
Re: Crankcase Evacuation Systems for TIII's
Looks like a pretty small diam hose? How much boost/ power are you thinking of running?
Re: Crankcase Evacuation Systems for TIII's
That is the stock 5/8" hose, the smaller 3/8" hose goes from the supra pcv valve back into the intake manifold. Being the separator is gone, this is much more free flowing. Planning to make 400 plus wheel at 25-28 psi. Also have venting on both valve covers to a catch can.
Re: Crankcase Evacuation Systems for TIII's
Quote:
Originally Posted by
DoubleD
That is the stock 5/8" hose, the smaller 3/8" hose goes from the supra pcv valve back into the intake manifold. Being the separator is gone, this is much more free flowing. Planning to make 400 plus wheel at 25-28 psi. Also have venting on both valve covers to a catch can.
It should be fine. I thought the pic was your whole system lol
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Re: Crankcase Evacuation Systems for TIII's
Strange coincidence, got mine done save for paint yesterday too. 5 days til Vegas:eyebrows:...
Re: Crankcase Evacuation Systems for TIII's
On the crank venting, there's a big advantage in getting as much venting form the block as possible vs the top of the valve covers. You don't want pressure running up the oil returns when your supposed to have oil running down the oil returns. On the T3, you already have the nipple at the block, which helps with that. Venting the valve covers (like Alan did) along with the block pull would definitely help even further.
Not to thread jack...but Alan, can you send me a pic of what you did with the radiator/radiator support? PM or email me at pculkin at juno dot com.
Thanks!
Re: Crankcase Evacuation Systems for TIII's
I've been working on this today some. Since we have added a large turbo and eliminated the airbox, we plan to run 3/8" hose from the PCV elbow to a small catch can then run a 3/8" hose from that to a 3/8" nipple on the turbo intake pipe (vacuum at all times).
We also added a set of valve covers with 8AN bungs welded on the driver side and will route those to a larger catch can from ATP Turbo with a filter on top.
My thinking is: the small catch can with 3/8" nipples will control oil vapor while in vacuum in conjunction with the stock PCV valve. It should also help with the transition into boost thanks to the line going to the turbo intake side...
....while in boost, the vented valve covers and larger catch can (with filter) should control oil vapor/pressure while in boost.
At any rate, I will update this thread if it works out or not.
Re: Crankcase Evacuation Systems for TIII's
I will be adding updated pictures and a diagram when I completely finish my set-up also, and some info about how this set-up works on the car in action! Hoping for the best. I have a tried motor with excessive blow by in one cylinder and lower compression, so this is a great test bed to get it all worked out before I build another short block.
Updated with a diagram of my 2014 set-up:
http://i84.photobucket.com/albums/k6...ps5b1388d4.jpg
Re: Crankcase Evacuation Systems for TIII's
Would love to hear what you find out with your set up!
The setup we are doing on a '91 Spirit R/T is just like the diagram posted above, except we are still running the stock TIII PCV tee and separator box, and have the 3/8" hose that used to go to the airbox to the turbo intake pipe (stock airbox deleted).
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Re: Crankcase Evacuation Systems for TIII's
Pretty much the same as mine Double, why the switch to the Supra valve, is it a better unit than the factory TIII PCV Valve?