STM Sealed Catch Can
Mar 29, 2016, 07:47 PM
#1
STM Sealed Catch Can
I'm considering purchasing this catch can. http://www.streettunedmotorsports.com/parts/stm_evo89_sealed_square_catch_can.htm
I am experiencing some excessive crankcase pressure. Yes, I've read about 500 pages on the subject, but I'm not getting a lot of feedback about this can. I currently run a Saikou Michi dual sealed can with 3/8 lines. My dip stick blows out, etc. Car is on e85. Makes around 500whp on mustang dyno. I don't want to vta because I have an Fp turbo and they don't like that. I'm looking for some real world feedback of owners of this can. I've talked to Stm about it. It sounds good, but is expensive. Thanks.
I am experiencing some excessive crankcase pressure. Yes, I've read about 500 pages on the subject, but I'm not getting a lot of feedback about this can. I currently run a Saikou Michi dual sealed can with 3/8 lines. My dip stick blows out, etc. Car is on e85. Makes around 500whp on mustang dyno. I don't want to vta because I have an Fp turbo and they don't like that. I'm looking for some real world feedback of owners of this can. I've talked to Stm about it. It sounds good, but is expensive. Thanks.
Mar 29, 2016, 10:12 PM
#3
EvoM Guru
iTrader: (1)
The STM can was designed for the FP turbo's. Its functional aspect is very similar to how my car is setup and should work perfect for you.
Mar 29, 2016, 11:26 PM
#4
If you're having so much pressure that your oil dipstick is shooting out, then a sealed system isn't going to solve your problem. A sealed system doesnt release that gas, its only collecting oil blowby. So its doing nothing for you in the first place other than preventing oil from collecting in your pipes (this also doesnt hurt anything btw)
From FP's own site
So in other words, they DO LOVE the elimination of absurdly excessive crankcase pressure, like every other turbo ever invented.
This means you should run a VTA setup, or spend a grand on custom one-of-a-kind vacuum pumps within your system to relieve that pressure. No one does this because VTA is more effective in the first place, simpler, and significantly cheaper. Hence why most big turbo cars pushing 600 and beyond (not just evos) run vented setups.
From FP's own site
The seals in the turbocharger were designed with expectation that the pressure inside the compressor and turbine housing will always be greater than the pressure in the bearing housing. If this is ever not the case then oil will come out pass the seals. A restricted crankcase vent will cause this to happen. If the amount of ring blowby exceeds the ability of the crank vents to release the pressure positive pressure will build within the crankcase. This pressure within the crankcase can exceed the pressure inside the compressor and turbine housings under some operating conditions resulting in oil being driven pass the seals by the improperly biased pressure gradient across the seal rings. In severe cases it may be necessary to introduce vacuum pumps to deal with crankcase pressure...
This means you should run a VTA setup, or spend a grand on custom one-of-a-kind vacuum pumps within your system to relieve that pressure. No one does this because VTA is more effective in the first place, simpler, and significantly cheaper. Hence why most big turbo cars pushing 600 and beyond (not just evos) run vented setups.
Mar 29, 2016, 11:35 PM
#5
The point of that catch can is to provide better-than-vta crank case ventilation. Under boost it actually uses the suction force in the intake pipe to "suck" crank case pressure out. Rather than venting directly to atmospheric pressure. If your crank case pressure issues is that bad I'd try to look for the cause of it, bu this is otherwise an acceptable band-aid solution.
Mar 30, 2016, 12:03 AM
#6
The point of that catch can is to provide better-than-vta crank case ventilation. Under boost it actually uses the suction force in the intake pipe to "suck" crank case pressure out. Rather than venting directly to atmospheric pressure. If your crank case pressure issues is that bad I'd try to look for the cause of it, bu this is otherwise an acceptable band-aid solution.
-6AN is very small for 500whp.
Please explain to me how their 6AN valve and tiny 6AN fitting on the opposite side is going to outflow a custom dual or triple 8AN or 10AN vented setup? Putting big lines doesnt suddenly make the system flow better, there is still a restriction on the valve cover, and the source of that restriction is small 3/8 ID of the fittings they use.
Heck, its a great looking kit - im not saying it sucks, but they should have included a 8 or 10AN valve instead because its much more appropriate for 500whp.
-The cause of the excess crankcase pressure issue is him wanting to run 500whp in the first place. Those who claim not to have issues are simply lucky they havent had their dipstick shoot out of their hood yet, or had seals blow out.
Mar 30, 2016, 02:56 AM
#7
Some good feedback here. I will not be running a vta can. Fp wants larger lines, not vta. They insist that crankcase pressure must be evacuated by connecting a sealed can back to the intake. By intake, I mean pre-turbo, not im. I have spoken with them on several occasions, and they could not have been more clear. No vta. I guess I am torn between this stm can, which by the way, has -10 lines on the back of the vc and -10 weld in bung for the intake pipe, or a buschur style setup that caps the pcv port on the im and basically uses the both ports in the vc to evacuate pressure, at all times. The buschur can comes vta, but can be routed back to the intake, if desired. Also, I'd like to keep this about cans, and not underlying causes. The cause is running race fuel, e85, and 500whp through a motor that's designed for 200. I've talked with so many local engine builders, tuners, etc. I'm burned out on that subject. It's just the nature of the beast. Thanks for the input. Keep it coming!
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Mar 30, 2016, 07:15 AM
#8
You should do like the other thread on this topic says and drill out your front valve cover line to 1/2 NPT and run a 5/8" line to your pre turbo intake. As mentioned in that thread, the valve cover is baffled well enough that there is no need for a catch can. Going from 3/8" to 5/8" is a 3x increase in cross sectional area.
Last edited by XSivPSI; Mar 30, 2016 at 07:37 AM.
Mar 30, 2016, 08:10 AM
#9
EvoM Guru
iTrader: (1)
-6AN is very small for 500whp.
Please explain to me how their 6AN valve and tiny 6AN fitting on the opposite side is going to outflow a custom dual or triple 8AN or 10AN vented setup? Putting big lines doesnt suddenly make the system flow better, there is still a restriction on the valve cover, and the source of that restriction is small 3/8 ID of the fittings they use.
Heck, its a great looking kit - im not saying it sucks, but they should have included a 8 or 10AN valve instead because its much more appropriate for 500whp.
-The cause of the excess crankcase pressure issue is him wanting to run 500whp in the first place. Those who claim not to have issues are simply lucky they havent had their dipstick shoot out of their hood yet, or had seals blow out.
Please explain to me how their 6AN valve and tiny 6AN fitting on the opposite side is going to outflow a custom dual or triple 8AN or 10AN vented setup? Putting big lines doesnt suddenly make the system flow better, there is still a restriction on the valve cover, and the source of that restriction is small 3/8 ID of the fittings they use.
Heck, its a great looking kit - im not saying it sucks, but they should have included a 8 or 10AN valve instead because its much more appropriate for 500whp.
-The cause of the excess crankcase pressure issue is him wanting to run 500whp in the first place. Those who claim not to have issues are simply lucky they havent had their dipstick shoot out of their hood yet, or had seals blow out.
Last edited by letsgetthisdone; Mar 30, 2016 at 08:45 AM.
Mar 30, 2016, 08:23 AM
#10
Letsgetthisdone- At least someone is paying attention. Are you running this to a single can, just like the stm? Also, I would never not run a catch can with e85. All that ethanol flavored water it catches should no doubt be removed from the motor. If I hammer the car for 100 miles, I get 1/4 full can. Its 90 percent water though.
Mar 30, 2016, 08:44 AM
#11
EvoM Guru
iTrader: (1)
Letsgetthisdone- At least someone is paying attention. Are you running this to a single can, just like the stm? Also, I would never not run a catch can with e85. All that ethanol flavored water it catches should no doubt be removed from the motor. If I hammer the car for 100 miles, I get 1/4 full can. Its 90 percent water though.
Mar 30, 2016, 01:11 PM
#12
I just bought the STM Sealed Can setup.... costed me $565 USD shipped to Canada 
. I bought it for 2 reasons. I have a DBB Fp Red, so it was made for that turbo and also I was tired of messing around with these custom setups, looking for a more plug n play setup.
I am just waiting to get the bung welded to the intake.
Just a caution for the newbies. It doesn't come with instructions and you have to size all the lines. Any information You have to work with whatever the website shows or I guess call them.
. I bought it for 2 reasons. I have a DBB Fp Red, so it was made for that turbo and also I was tired of messing around with these custom setups, looking for a more plug n play setup.I am just waiting to get the bung welded to the intake.
Just a caution for the newbies. It doesn't come with instructions and you have to size all the lines. Any information You have to work with whatever the website shows or I guess call them.
Mar 30, 2016, 03:56 PM
#13
^ That should actually work like a charm. Always easier to buy a complete kit than to start with nothing.
I understand that FP recommends routing the catch can into the intake to allow the turbo to assist in ventilating crank case pressure, but are there any other adverse effects if you decide to go VTA with your catch can setup using an FP turbo? Take a guess why i'm asking.
-pal215
I understand that FP recommends routing the catch can into the intake to allow the turbo to assist in ventilating crank case pressure, but are there any other adverse effects if you decide to go VTA with your catch can setup using an FP turbo? Take a guess why i'm asking.
-pal215
Mar 30, 2016, 04:02 PM
#14
EvoM Guru
iTrader: (1)
^ That should actually work like a charm. Always easier to buy a complete kit than to start with nothing.
I understand that FP recommends routing the catch can into the intake to allow the turbo to assist in ventilating crank case pressure, but are there any other adverse effects if you decide to go VTA with your catch can setup using an FP turbo? Take a guess why i'm asking.
-pal215
I understand that FP recommends routing the catch can into the intake to allow the turbo to assist in ventilating crank case pressure, but are there any other adverse effects if you decide to go VTA with your catch can setup using an FP turbo? Take a guess why i'm asking.
-pal215
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Pal215 (Mar 30, 2016)
Mar 30, 2016, 05:18 PM
#15
I'm actually torn between getting the STM sealed catch can, or sending a valve cover to Tom to do the the drivers side port for me. I have a DBB FP Red and I found out in the compressor housing of it before I even did any WOT pulls. Not a lot, but there was some in there. I have a 2.3L with no balance shafts. Recommendations?