Redoing my catch can and need pcv hose recommendations

moooosestang

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I don't know why this is so hard to find. i need a 1/2 inch id hose that can handle 22-24 hg of vacuum without collapsing. i ordered this because it said pcv and it's mishmoto branded, like that really matters. I didn't read the reviews and some say it collapses. i had been using a ghetto setup with 3/4 inch hose and a 1/2 inch hard nylon air tubing inside it to keep it from collapsing. that setup looks horrible though. https://www.amazon.com/Mishimoto-Bl...ocphy=9011707&hvtargid=pla-734178012407&psc=1
 

JC SSP

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There is regular fuel line low-psi 5-7 what's used on carburetors, then there is EFI fuel line which is higher psi 30-60. You can always get A/C hoses too...
 

moooosestang

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i'm going to try this mishmoto hose first. i'll keep it as far away from heat as possible and make it as short as possible.
 

Samos3

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Look for some power brake booster hose. I do believe fuel line is burst rated not vacuum rated, pressure in the wrong direction.
 

Dino Dino Bambino

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On my 3V, the passenger side catch can has 3/8" hose and the driver's side 5/8". The hose I used is thick rubber that won't collapse under vacuum. IMG_20230624_161812.jpg IMG_20230624_161748.jpg Engine_BBK.jpg
 

Pentalab

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That's what happened to that Titan submersible. The carbon fiber wasn't designed to handle massive 40 mpa external sea water pressure...with just 1 mpa internal air pressure. However, carbon fiber tanks will handle massive internal pressure...and 1 mpa external pressure. After XXX compression / expansion cycles,after XXX dives, it finally delaminated, imploded, and they were all done in a split second. Water temps at that depth are aprx 16-20 F. Not certified, and not built to any standard. Everybody previously told em that carbon fiber was not the material to use for that application.

Ever seen a carbon fiber driveshaft explode into a million semi circular pieces on a mustang. It twists 4 X as much as a steel DS....and 3 X as much as an aluminum DS. But this is way OT.
 

xeninworx

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I’m using Mishimoto hoses and they don’t collapse for my catch can. After 4000 kms, the catch can was almost full. So the hoses are definitely not getting restricted.
 

diambo4life

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Why not run PTFE line or regular AN hose (if not using E85) to plumb it?
 

GriffX

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Chemistry lab suppliers have dedicated vacuum hoses,too. But usually they are red.
 

Wolf302

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As others have stated PTFE will probably be the best long term solution
 

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