Had the silicone job done about 15k miles ago and I just found the 2nd of 2 hoses
split where they attached to the crv valve and vacuum chamber.
Don't know the brand of silicone hose on my car but was wondering if there's a
brand that's notorious for splitting.

 

Better quality line is less likely to split, but if exposed to fuel vapor, oil, or maybe rich exhaust the silicone will break down. The Si line on my engine was rather soft when I put in Viton.

 

Viton split too....I got at least 3 of them splitting...

 

Makes you wonder if it's worth doing the silicone vacuum job.

Just bought a blown FD with 113k miles and it has what appears to be the original
vacuum hoses. I didn't see any bad or brittle ones yet.

 

I replaced mine with silicon hoses from hosetechniques.com three years/ 17,000 miles ago. For what it's worth I had the UIM off last weekend and all the hoses were in perfect condition.

 

I have about the same amount of miles on my hose job with no indication of degradation. Some people bitch about hosetechniques having low quality silicone, but until mine start to split, kink, etc. I have no reason not to recommend them.

 

how the ends are cut is very important. silicone lines if they have any taper on the ends they tend to tear when you put them on. the tiny tear grows over time

 

Where did you get your Viton from? I'm using the HighTempSilicone viton hoses and they are definitely different from the McMaster-Carr stuff.

Dave

 

Using a cutter like:

http://www.acehardware.com/product/i...ductId=1272537

helps make a clean cut and less likely to split.

 

This is very true. Silicone has very low "cut growth tear strength". Cutting the ends at 90º will help some.

Splitting silicone lines are caused by excessive hydrocarbon contamination. The silicone will weaken from the inside out and fail. A cure for this is to use Viton hose. I am not sure what hose DriftSM2 is using, but I warranty our hose from this type of failure. A 100% base Viton hose should be able to be submerged in hot oil for thousands of hours without a failure.

Because I used to make Hosetechniques hoses, I am aware of quality "issues". I am sure most of the problems with their hose is in the supered and superblue colors. Those are the colors we made with a peroxide curing system. Hosetechniques wanted these colors to be on the cheaper side due to heavy volumes. We used a platinum system on all of the other colors. When we produce products for customers it is to their specification and design. On our own hose we use a 100% platinum curing system and heavier wall thickness. We felt that the wall could be beefed up some for a longer lasting product.

Jim

 

Silicone and Viton are two entirely different formulations. Silicone is very bad news if exposed to hot oil. There is an evaluation of various types of materials used as vacuum hose on this web page: http://www.geocities.com/sdrx7_club/technical.html

Click on "Report" in Item 7.

---- Bill

 

I have read that hoetest PDF several times and cant find anything major wrong with the data. I could spend the time to do this same test but I would come up with identical results.

Good idea to link that PDF.

Jim

 

That's interesting info about the hosetechniques color manufacturing methods. Sounds like I got lucky by choosing yellow which used the platinum curing system.

 

Yellow is Platinum! However you must have purchased it a while ago (18+ months) because we stopped making it due to a compound issue. I saw some of his new yellow today. Looks like they found a new supplier for it.

 

Yep. I bought the hose set in the spring of 2000 after the stock hoses going to the pressure tank were so hard the tank wouldn't hold pressure. So actually I did the hose job 4 years ago and they're still in perfect condition.