Collapsed exhaust hose

KENO wrote: I agree that some hoses will collapse when the inner layer gets hot but don't go along with "designed this way" It can happen but sure isn't designed into the hose.

I have a strong feeling that the concept was nothing more than an excuse that some marina dreamed up.

Unless the hose completely collapses and shuts down all exhaust to quickly shut down the engine, more damage will be done than good. The, there's the potential of a cooling water backup to the engine.

MrMcD wrote: Sorry Keno you lose this bet. I worked for Dayco Rubber from 1980 to 1990, we made those Marine Exhaust tubes. When exposed to direct fire with no water injection like when a boat engine loses coolant flow the inner liner is designed to collapse. When the inner liner collapses the boat loses 80% or more of its power alerting the driver to the problem. The outer wal of Marine exhaust hose is designed to survive the exhaust heat so water outside the boat does not breach and sink your boat if a fire burns through the outer wall. Gates Rubber and others offer Marine exhaust tubing also. It is expensive but mandatory for safe boating. The hose is mandated by Marine law. .

KENO wrote: I'm wondering if anybody can show me any documentation of this? Something like one of the hose manufacturers stating this in some technical document or even in their advertising

Mark,
Without any documentation especially the "marine law" you refer to it's all "hearsay" or simply marketing.

KENO wrote: I really don't like to agree with Pete too often but that soda is still headed my way

Come on Ken. I'm trying to help you get that soda!

Bite me. I gave you facts you don't like. Sorry you don't like these facts.
I guess Correct Craft and all the other MARINE MANUFACTURERS USE this type hose because they like spending your money?
Standard coolant hose is available for 1/3 the cost. Knock yourself out and save the money.
I know the law, you look it up..

It's a simple request.................documentation of some kind.

If you know the law, then spit it out.

I can't find this "requirement" to collapse and choke off the engine anywhere.

Sure there's a requirement for marine exhaust hose just like for marine fuel line.

It's easy to read the test requirements for marine fuel line, like I initially said I just want to find the documentation.

8122pbrainard wrote: KENO wrote: It's a simple request.................documentation of some kind. I can't find this "requirement" to collapse and choke off the engine anywhere. I looked as well and couldn't find anything. Still trying to get you that soda!

It;s in my fridge right now Pete but it can wait a while. Early morning visit to drop it off

We'll let you tell me when the big bet has been won or lost pending any more info

I went back and tried to look up the facts.   What I learned is the Law has Changed.
SAE Spec J2006R2 which I assume was an update done in 2006 changed the requirement for the Inner Wall of Marine Exhaust Hose.   It now states the hose must be designed to withstand 2 full minutes of direct exhaust without burn through.
There is a second standard for Commercial Boats with Standard SAE J1942 which I could not find the wording for.
Third there are the ABYC Safety Standards that must be met.
All seem to follow the 2006 Law for 2 minute direct dry exhaust no burn through standard.
I also found that Dayco and Gates no longer make these hoses, each company has sold a few times in the 28 years since I worked in that industry.
My information by todays standards is OBSOLETE so I apologize for sharing obsolete information and then standing on it rather than verifying.   I did know it to be true both by training and experience which has normally been solid, but things change and I was obsolete on this subject.
I found another note stating there was a change in 1996.   I don't know when the collapsible Exhaust hose was taken off the market but it was between 1987 and 2006.
I knew I never should have hit send on my note last night but I it was late, no excuse. I was wrong. My apologies.
We did make this hose back in the 80's and it was the standard at that time.
I suspect all of our boats that have not had a hose replaced still have the old style on our boats if they were built prior to the standard changing.
I should have to send you a Coke also since I am wrong on this. Maybe a beer also since I was rude with my response.
Aside from personal experience I remember Dayco being sued by a Tug Boat operator at Long Beach Harbor, a Tug boat lost coolant while operating and burned through the Exhaust tube allowing sea water to come in and the dang thing sank.   They had Dayco hose on the boat at the time it sank.   The Lawsuit was for nearly $100K back in the 80's that was a huge suit.   Dayco was found innocent because the mechanic had installed regular coolant hose not the Marine Exhaust hose. I remember at the time our staff said the tug would never have sunk if the proper hose was installed because the inner wall collapse would have shut down the engine.   You don't forget big cases like this.
Mark

One other thing Mark

What's a 16 ounce can of soda cost out there in California? I hear everything is expensive out there.

I'm cheap so I might wanna buy it here and take it with me.

I would not apologize Mark remember that none of these guys have a boat built anywhere near when the law was changed. If the impellers have never been changed since 1983 don't think for one minute the exhaust hoses have been.

Mark,
I appreciate you taking the time and getting down to what's current with the hose. Thanks.

Charlie (brady) just finished installing new hose in his Cuda. He used the Vetus and was pleasantly surprised on how easy it was. He even posted a review at Jamestown.

"Brady from Northern Wisconsin

Comments about Vetus Vetus Exhaust Hose:
I have worked with old fashioned exhaust hose in the past, stiff and inflexible. The Vetus hose was so flexible it made the job easy!
Bottom Line Yes, I would recommend this to a friends."

The Cuda's have a very tight bend with zero clearance under the aft seat but the Vetus made it without a problem. He said it also went on easy over the thru hulls and the manifold elbows. It's more expensive but not as much as going to silicone hose. Well worth the extra cost.


"