Well, being I got more money than sense (for the moment anyway); I bit the bullet and went with VITON.

Thanks for all the input you guys, I appreciate it.

 

If you went with the McMaster-Carr viton, make sure the walls are not too thin - thin walls make the hoses much more easy to kink when bent and shut off their flow.

 

Thanks Dave...I got the heavy wall stuff...guess I should've done my last post proper like and all; I ask forgiveness from the group:

http://www.mcmaster.com/#viton-tubing/=buo0z

A) 4mm (3/8") O.D., 3.2mm (1/8") wall thickness, 60A (soft): #5119K48 @ $9.61/ft.

B) 6mm (1/2") O.D., 3.2mm (1/8") wall thickness, 75A (firm): #5119K19 A $12.60/ft.

 

You won't regret the decision. Plus, it's a nice dull black. vacuum hoses aren't for show anyways.

 

Silicone will stand the temp without issue. And will tolerate oil VAPOR, maybe not direct contact but I know http://www.stylinmotors.com offers a lifetime warranty so you can't go wrong. And they have several kits for Mazda that are much less than anywhere I have seen. And their customer service is awesome.

 

I've said this before, and I'll reiterate what I think is an important point.

IMHO, it's not worth the money to use all Viton hose. GOOD QUALITY silicone vacuum hose works GREAT and will LAST FOREVER.

I've been using Hose Techniques hose for YEARS with NO FAILURES. No splitting, swelling, etc. Their stuff is very thick wall, doesn't kink, has good elasticity, and is reasonably priced.

If someone handed me a bone stock FD with hard, brittle stock lines and cracked check valves, here's what I would do.

- Replace the broken lines with 3.5mm silicone.
- Replace the lines going to/from the upper intake manifold that regularly get removed for maintenance with 3.5mm silicone.
- Replace the MAP sensor vacuum line with 3.5mm silicone.
- Replace the crappy plastic stock check valves with my Viton check valves
- Leave the rat's nest ALONE. Those stock lines are baked on there and aren't going anywhere.

Next, remove the stock PCV valve that goes from the oil fill neck to the upper intake manifold and cap both ends up, that's how the 95's came from the factory.

If you have a lot of oil in your intake tract, it's most likely from a tired motor that's getting a lot of blowby or worn turbos that are burping up oil. Also, make sure to use a funnel when you fill the oil up. If you pour the oil in from the driver's side of the car, oil will slop into the PCV nipple and down into the primary turbo inlet, getting more oil into the intake tract where it shouldn't be.

Now, there are spots where Viton makes sense. I run a catch can and use 6mm Viton hose running to the catch can. Silicone hose that is saturated with THAT much oil continuously will soften over time. I got 3 feet or so of 6mm hose and I was good to go.

Dale

 

I went with the good old fashion autozone silicone hoses, thse things will never let you down. I even replaced my turbo coolant hoses with the autozone silicone and no problem so far...

HAHA j/k im joking, I used the "Hose Techniques" as well, and it works and looks great