Collapsed PCV outlet hose to catch can - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

FrickingReallySlow · 10-15-2023, 08:42 PM

I installed a catch can from the earlier this year and just noticed that the outlet hose that goes from the back of the block to the catch can has pretty much collapsed (see pictures). This sort of intakes that somehow there vacuum inside the block?! or the heat somehow got to it? The hose from my catch can to the breather port of my Edlebrock SC is fine.

I bought the braided reinforced vacuum hoses at the same time and just cut it into 2 pieces. DID I BUY THE WRONG KIND?! I checked the catch can and there a little bit of oil as expected. When I installed the catch can I removed the bronze filter and replaced with steel scrubbing pad to allow better flow. I don't feel any issues or CEL but something is definitely wrong if the PVC hose collapsed. Previously without the catch can the hose provided by edlebrock worked perfectly.

Let me know if there a specific vacuum hose I need that for this application many thanks

new2subaru · 10-15-2023, 09:36 PM

I could be wrong but the looks like GP air hose to me. I can make out W P which stands for working pressure.

https://www.gates.com/us/en/fluid-po...l-purpose.html

FrickingReallySlow · 10-16-2023, 10:43 AM

Quote:

Originally Posted by new2subaru

I could be wrong but the looks like GP air hose to me. I can make out W P which stands for working pressure.

https://www.gates.com/us/en/fluid-po...l-purpose.html

Thanks for the link looks like it is an Air hose the WP was 300PSI from your data sheet temp was only up to 200F

new2subaru · 10-17-2023, 05:19 AM

Quote:

Originally Posted by FrickingReallySlow

Thanks for the link looks like it is an Air hose the WP was 300PSI from your data sheet temp was only up to 200F

You're going to replace that with PCV hose?

FrickingReallySlow · 10-20-2023, 12:23 AM

Yeah since I never had a problem with either the OEM PCV hose or the one from the edlebrock SC kit I'm guessing PCV hose has a higher temp rating. Are you suggesting something else?

Quote:

Originally Posted by new2subaru

You're going to replace that with PCV hose?

Grady · 10-20-2023, 06:14 PM

I would get silicone vacuum tubing.

new2subaru · 10-21-2023, 08:04 AM

I would imagine the GP hose would collapse under vacuum.

I haven't looked specifically for PCV hose/Vacuum hose.

10-15-2023, 08:42 PM	#1
FrickingReallySlow Senior Member Join Date: Jun 2021 Drives: 2015 FR-S Location: San francisco Posts: 368 Thanks: 161 Thanked 157 Times in 103 Posts Mentioned: 8 Post(s)	Collapsed PCV outlet hose to catch can I installed a catch can from the earlier this year and just noticed that the outlet hose that goes from the back of the block to the catch can has pretty much collapsed (see pictures). This sort of intakes that somehow there vacuum inside the block?! or the heat somehow got to it? The hose from my catch can to the breather port of my Edlebrock SC is fine. I bought the braided reinforced vacuum hoses at the same time and just cut it into 2 pieces. DID I BUY THE WRONG KIND?! I checked the catch can and there a little bit of oil as expected. When I installed the catch can I removed the bronze filter and replaced with steel scrubbing pad to allow better flow. I don't feel any issues or CEL but something is definitely wrong if the PVC hose collapsed. Previously without the catch can the hose provided by edlebrock worked perfectly. Let me know if there a specific vacuum hose I need that for this application many thanks Attached Images

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10-15-2023, 09:36 PM	#2
new2subaru Weight Weenie Join Date: Aug 2015 Drives: 15 FR-S Location: Canada Posts: 2,677 Thanks: 5,293 Thanked 2,446 Times in 1,404 Posts Mentioned: 12 Post(s)	I could be wrong but the looks like GP air hose to me. I can make out W P which stands for working pressure. https://www.gates.com/us/en/fluid-po...l-purpose.html

10-20-2023, 06:14 PM	#6
Grady Senior Member Join Date: Jun 2017 Drives: BRZ Yellow, Ranger, Evora, WCM S2K Location: Dallas Posts: 1,712 Thanks: 354 Thanked 1,500 Times in 786 Posts Mentioned: 14 Post(s)	I would get silicone vacuum tubing.

10-21-2023, 08:04 AM	#7
new2subaru Weight Weenie Join Date: Aug 2015 Drives: 15 FR-S Location: Canada Posts: 2,677 Thanks: 5,293 Thanked 2,446 Times in 1,404 Posts Mentioned: 12 Post(s)	I would imagine the GP hose would collapse under vacuum. I haven't looked specifically for PCV hose/Vacuum hose.

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