Silicone hose job - where to use 3.5mm? 4?
#1
Silicone hose job - where to use 3.5mm? 4?
Doing the silicone hose job this week and I've read a few threads about it. I'm generally ready, but I have one question before I get started.
How can you tell where to use 3.5mm hose rather than 4mm?
That's a small difference when looking at something old and worn
I was surprised to not find a list anywhere (or markings on the colored diagram) showing what the size of each hose is
How can you tell where to use 3.5mm hose rather than 4mm?
That's a small difference when looking at something old and worn
I was surprised to not find a list anywhere (or markings on the colored diagram) showing what the size of each hose is
#4
RX-7 Bad Ass
iTrader: (55)
I recommend 3.5mm everywhere for the smaller lines. The turbo control actuator and boost control lines are 6mm.
People used to use 4mm as that was the only size available. It doesn't fit as nicely and usually requires the lines to be zip tied and/or glued, which is ridiculous. Proper fitting lines will be VERY tight and will never pop off or fail.
I recommend boostcontroller.com for hose, they are reasonably priced, thick wall and quality.
If you wanted to get super fancy there could be spots where 4mm will fit, but I've never felt the need for it.
Dale
People used to use 4mm as that was the only size available. It doesn't fit as nicely and usually requires the lines to be zip tied and/or glued, which is ridiculous. Proper fitting lines will be VERY tight and will never pop off or fail.
I recommend boostcontroller.com for hose, they are reasonably priced, thick wall and quality.
If you wanted to get super fancy there could be spots where 4mm will fit, but I've never felt the need for it.
Dale
#6
Full Member
iTrader: (1)
I'm trying to plumb the purge control valve and catch tank right now, obviously I can't use silicone due to fuel vapors but I'm having trouble finding the right size line that will fit on both the catch tank end and the solenoid/check valve. Are these specially made hoses with different sizes on each end or am I missing something?
Last edited by #slevin; 03-07-17 at 12:03 PM.
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#8
RX-7 Bad Ass
iTrader: (55)
If you use good quality silicone hose (the stuff from boostcontroller.com applies) you won't have problems with fuel and/or oil exposure.
The problem is a lot of the myths around silicone hose date from 15+ years ago. Lot of hose back then wasn't sized right, had thin walls that would kink, would split on the end if you didn't cut it right, turned into goo with exposure to oil, etc. I've seen that stuff in person. Modern hose won't have any of those problems.
I've used silicone hose for a long time on oil catch cans with no problems. Not the best setup, but it does work. Viton is better, but really the only place I recommend Viton is the catch can and that's it. It's too stiff, doesn't fit as well, and is really pricey and flat out overkill on all the other vacuum lines.
Dale
The problem is a lot of the myths around silicone hose date from 15+ years ago. Lot of hose back then wasn't sized right, had thin walls that would kink, would split on the end if you didn't cut it right, turned into goo with exposure to oil, etc. I've seen that stuff in person. Modern hose won't have any of those problems.
I've used silicone hose for a long time on oil catch cans with no problems. Not the best setup, but it does work. Viton is better, but really the only place I recommend Viton is the catch can and that's it. It's too stiff, doesn't fit as well, and is really pricey and flat out overkill on all the other vacuum lines.
Dale