Here's the deal:

Nitrile: (Buna-N) handles gas and oil well, but not high heat, cheap. Makes good vaccum hose in low temp applications, but on a rotary? HAHAHAHAHA. Garfinkle, (whoever the hell that is) is ignorant and obviously unedumacated.

Verdict: Why would you use the same crap that the factory installed in the first place that caused your problems?

Silicone: (many different grades and wall thickness)
DOES degrade in DIRECT contact with gas and oil, but we're talking about VACUUM hose here. High heat resistance.

Verdict: The cheap stuff (Hose Techniques and about 100 other vendors) is BARELY adequate and a complete rip off. The good stuff - and there is only one - DUROBLUE, will outlast the car. It is Mil-spec (Military Grade which means it's certified to use on airplanes) They are all relatively inexpensive. Don't be sucked in by marketing. You are after quality.

Viton: Absolutely the best, but why invest in total overkill and spend up to $400 for freaking hose?

Verdict: If you are building the Space Shuttle this is what you want to use - literally. Extremely expensive.

Bottom line: For vacuum lines go with mil-spec silicone hose like Duroblue and you'll never have to worry about a thing, and you'll have a lot of extra change in your pocket. Use Nitrile for oil carrying lines, better yet just get Mazda OEM since it has the correct bends built in and will cause less stress. Use high pressure METRIC fuel injector hose for gas lines.

 

Where can one get Duroblue?

 

O.K. Here is what Dave Disney and myself have seen from different brands of silicon hoses. The stuff from baker precision is not that good. THe stuff from PFS and from Hose Tech. is very similar. If you are going to use silicon I would go with either one of them. I went with HT because they have more colors and insted of 4mm it came with 3.5mm which tends to stick a lot better. The HT was VERY kink resistant. I did not have to use any springs to keep the hosees from kinking.

 

Rated R1, did you get the 2 hoses confused? I took a Hose Techniques sample to Baker Precision in Febuary. The Baker Precision hose was 10 times better than the Hose techniques. I know, I had both in my hands at the time and could compare how "kink-resistant" they were. At that time the Baker Precision hose was thicker, and felt more quality, it resisted the Kink much better than the Hose techniques hose, it was heavier and also felt more durable. This was over 6 months ago, so it's possible that both companies changed vendors from which they buy from, but I doubt it. For the money the Baker Precision hose was the best choice for me. Even with the Sear's Craftsman brand "handicut" cutters it was cheaper than the Hose Techniques Kit. If your not sure what hoses to buy, ask for a sample of each hose from each company before you decide.

good luck,
eric

 

The HT stuff is GARBAGE and a major ripoff. IT SUCKS.

I'm an FAA Certified Airframe and Powerplant mechanic and it is the worst crap excuse I have ever seen for hose.

I put in on my car simply because I did not want to have to buy a whole reel of QUALITY hose at the time, and I trusted them. What a joke.

I kick myself in the *** everytime I look at that **** under my hood, and can't wait for an excuse to replace it.

Kink resistant? Heat it up a little..............watch it fold in half. Like I said, it is BARELY adequate. The entire site is marketing bullshit. You ALWAYS get what you pay for.

I always like to end on a positive note: It does come in pretty colors!

 

I bought my silicone tubing from McMaster-Carr, and two and a half years later it's still holding up.

http://www.mcmaster.com/cgi/loadpage...6&descid=30725

There's info on that link w/ temp, tensile strength, etc.

 

I guess it's not working... so go to www.mcmaster.com and search for silicone tubing.

 

It's a pity we can't score a good discount on Viton hose somewhere. As much trouble as it is to replace all these, and as much as we have to trust them to do their job, I'm leaning toward using Viton. It's kind of like using Aeroquip hoses on a plane. Do a first rate job once, and you don't have to worry about it for years.

I just bought a car that seems to have boost problems (boost gauge arriving in a day or two), and will have to do this job very soon. I'll be looking for the best price on Viton.

BTW- Ron, do you know what an RV-3 is? Can you say turbo 13B

Cheers,

 

YEAH BABY! I love Rotary powered......anything!
But I would prefer a Moller Skycar...sigh. Maybe one of these years.

 

Mine came with my car from mazda and ten years later it is still holding up...just a thought...is the **** mazda used really all that bad then?

 

It seems to me that the original Mazda stuff held up pretty well under the circumstances. Sadly, it usually outlasts the engine

Does anyone know what a complete set of Mazda hoses would cost? I'd be willing to bet that it's more than Viton

Moller skycar Dream on

Cheers,

 

so where can we get duroblue hoses?

 

Just buy a roll of goodyear tubing for 25 bucks. You get 50 feet and you'll only use 25.
John

 

That, and hose techniques sends you a piece of candy in the box, how can you go wrong!