The OEM parts are made by; extruding rubber compond to form the inner tube at a smaller internal diameter than finished, then a loose braid reinforcement is woven over that, and then an outer tube layer is extruded over the inner/mesh. This is uncured rubber compound. This raw tube can be made in km lengths in a co-extrusion production run. It's stinkin ch!t to work with. The straight raw tube is cut to length to suit the component. It is closed into a metal clam shell mold form of the exact size. The tube is plugged and pressure inflated to form the unkinked inner and outer shape form. The inflated tube mold is then heat cured in an autoclave some time, cooled, then the clam shell mold opened. The rubber compound is thermosetting. Once heat cured it cannot be remolded or reshaped. Because the inner tube is smaller and the textile reo is loose and can slip between the outer there is NO tension in the reinforcement trying to resist the hard set bends, the finished product will always retain the shape... in fact resist deformation, just like the straight tube. Thats the problem with this method - the reinforcement mesh embedded in the tube resist tension loading, bending and pressure deformation. The rubber resists stretch and compression when bending, so it fights to retain the shape it was when cured - straight. The better choice of tube would be reinforced PVC because it is a thermo-forming compound, rather than a thermo-setting compound... and so, heated enough, inflated and molded then cooled there will be more chance of having the reo textile comfortably shift within the easily formed plastic. Remember, you can put the bending spring around the outside of the tube when forming plastic, but air pressure is needed to inflate for no kinks.
Thank you for great feedback! I've re-read couple of times to make sure I follow your suggestions/explanations and it all makes sense. Of course, my method isn't ideal, but so far it worked. Just keep in mind I wasn't trying to get perfect OEM part (although it would be nice), I was simply trying to get something close enough considering budget and time. Either way, your explanation is very informative and useful. Appreciate your feedback and hopefully others will find that informative as well. Thank you for watching!
For 1 year yes after i don't know, i installed it since 1 year on my rv fiat ducato. My engine run particularly cool around 80c 100c peak maximum for a minute or two. With modern engine how can get to 130c peak and build a lot more pressure 2.5bars for somes, i don't know if it's suitable but for old one .... pvc seams to do the job. @calthorp Edit: i speak about textile renforced pvc hose. The non renforced one does last more than 2 mn in this case.
You can also put the rubber hose in boiling water with springs inside and bent to your shape with zip ties holding it in place, then put under cold water to set it. no need to wait for 2 hours.
I think immersion in Hot water will allow for more even heating of the hose perhaps? I've got heat gun and gloves but I think the hot water is going to be a safer option as well? In this guy's case, he's doing a coolant pipe so the water going through the pipe is going to re heat that pipe and it's going to try to counter act the shaping just done? I know with some older V8 motors that didn't run a decent bypass pressure valve in the water pump; they would often suffer from the radiator lines collapsing in on themselves whilst in operation so these "springs" were often used permanently in place inside the coolant hose to prevent collapse? With that in mind, it maybe perhaps something this guy can do to stop the hose kinking as the coolant becomes hot and tries to reshape the hose back to it's previous shape?
Yes, that would be better option if it's possible (some shape is hard to fix in place while putting in the boiling water, but zip ties will do the trick). Thank you for alternative option. Thank you for watching!
@@jameshatton4211 It has been couple of months and I constantly checking this hose to make sure it haven't kinked. So far, it still preserves the shape I gave after my second attempt at 9:26. No issues so far even though it's a coolant hose and runs hot liquid. I think the hose that I got from the store was fuel hose - so it's pretty thick and it wouldn't be that easy to re-shape it with hot liquid going through it as long as it stays in place.
I recognize your accent. My grandfather in Poland use to feel pipes, hoses e.t.c. with fine sand. With both ends plugged he could bend stuff in any shape without kinks or diameter reduction on corners.
Just a point to make those pipe bending springs are used to bend copper pipe and fit on the outside of the pipe… that ones that go inside the pipe have a loop that that’s attached to a cord to be able to pull back out after bending 👍🏼good video buddy
Packed sand should work as long as it's not too sharp of an angle. Yes, if you don't have a spring of right size, use your creativity as DIY man. I've read people use sand (as you are), one person even suggested to use wooden board, nails, and screws to create a shape. So, just use your creativity as DIY, if it doesn't work, try something else. That's how I got to this method.
I am an auto technician and I have considered this a couple times, wasn't sure of the best method. My grandmother had a car that had a small bypass hose that costed an inordinate amount of money for what is essentially a tube... So at the time I just made an enormous loop to avoid a kink. It worked perfectly and truly ironically I bought several feet of hose for less than the cost of the molded hose.
The more you do them, the better it gets each time. You'll get to the point when no one is able to tell the difference between OEM hose and your custom made one. Thank you for watching!
Hey! In industrial hose making you make a metal form to the exact shape you want and then put a flexible hose over the form and stick the whole thing in an oven to bake.
@@makingcookingfixing The hose doesn't harden it stays flexible but with a new shape. It just remolds itself so - the form can slip out the way it went on.
Really good vid! Thanks for the wonderful video, and a huge thanks for not ruining it with crappy background music. I don't know why some people feel compelled to add annoying background music throughout their videos.
Ok. I don't know the "butter" temperature one would need, but I have conjured up some tweaks for your mousetrap that may result in a smoother more uniform part using the same materials. -make a jig on the bench -stuff hose full of sand and tamp it down -bury hose in a box of sand -heat in oven at (magic) temp for (enough) minutes -pluck hose place in jig (leaving sand inside) -maybe dump hot sand on it -let it cool overnight There! I just wrote your next script! (btw, thank you BTW, for explaining how the real thing is done. Love to learn.) Thanks, mans!
Thank you for the script! There are multiple viewers who suggested the same method. I personally haven't tried yet, but I'm going to for sure next time I need a hose. There's always spot for improvement and improvisation especially for DIY guys. Thank you for watching!
Some people may be concerned about weakening the hose with the heat, but it will most likely not be an issue. Because when the hoses fail, it is usually not in the middle. They usually fail near the clamp, which is not the area that you have to heat up. The factory bent hose is better, but sometimes you need to make do with something like this because of budget concerns or lack of availability of the factory hose.
Thanks for that little spring and applied heat demon station to the rubber hoses. I have found that if you just apply a little heat to where the inside of the bend will be for you bend it. Then continue applying heat after the hose is bent the heat will be more consistent around the rubber making the hose except the bend better. Thanks again.
I prefer boiling water , but its really only good for fresh builds as its a slow process, but works BEAUTIFULLY! Another tip, even if not benfding forming, use the heat gun to heat ends brfore slipping over pipe nipple. then clamp when warm, NOT hot or it will sqweeze out the hose too much. Best wishes,I built diesel power units for awhile, and did this all day long. You get tough hands doing this, those big 3" inch suction hoses are a beast to form!
Boiling water works as well, it is just much slower process. I think boiling water is much easier on big hoses (as you mentioned 3'' in larger) since the heat uniformly distributed. For smaller hoses, heat gun works just as good. Thank you for watching!
Interesting… I imagine a small amount of dish soap added could make it even smoother… thanks for the tip! I will try it next time I have a need to cut “sticky” rubber hose!
For the hose not to get kinky you can bend it to a wider angle and play with the length, most times placement allows you to do that so it solves the problem by not strictly following the factory curve. For example a U hose can be make it a little longer so it doesn't kink, for an L shape you can cut it shorter so to stretch the 90 degree angle and so on. I need to find those springs, there were a lot of times i needed this to build my hoses from straight ones cause i ended up modifying old ones or connect them with L joints etc.
Links to the variety of springs in the description of the video. Yes, it is a lot easier to work with longer hoses and give them the shape you need. The U-shape you mentioned, requires less force to form it. Just make sure you heat it up well enough to preserve the shape, because once you cut it, it might not be enough of curvature and it will start to kink. That's what I explained at 9:26. It may take several trials before you get it perfect. The more you do, the more experience you get and it gets easier. Thank you for watching!
Plug one end of the hose. Fill hose with sand. Plug remaining end of hose. Heat and bend and secure the shape until it is cool. Open the ends and remove the sand. WASH THE HOSE OUT. Let dry and you are good to go.
@@robertsmith2956 240 may not be hot enough to effect a permanent bend. Radiator water can go past 200F. With the right radiator cap, you can reach 240F.
Thank you for sharing this method! Multiple people have suggested the send as well. I think at least dozen of people, but I never tried it myself, but I'm going to for sure next time I need a custom made hose. If dozen of people suggested it, I bet it'll work. Again thank you for sharing and watching the video!
You can possibly use the metal spring on the outside of hose, which will keep it from kinking, just cut spring to length, and buffer the cut end to prevent sharp cut from damaging hose
That could possibly work. I've never tried it, but I considered it. The only issue with this method I could think of is if metal spring tube is outside of the hose, and you get it red hot, it might burn through the hose. It is unlikely since the hoses are pretty durable. but I still could damaged the hose.
Thank you. A lot of viewers also recommend boiling water instead of heat gun since it puts less stress on a hose and does not damage it as much. I've learned a lot myself from the comments here! People suggest use send instead of bendable spring tubes and it works. There are a lot of great suggestions in the comments. Thank you!
Another option is to use armored aircraft hoses. You can bend them most any which way without compromising strength, and they look cool too. I also needed a fuel filler hose for an old Jeep Cherokee that went from the filler assembly to the tank, and I couldn't find one until I went to the local Aircraft Fixed Base Operator, who had the size I needed in bulk. It wasn't armored, but it was rated for Avgas, and solved the problem. It came with supporting ridges for bending up to 160 degrees without collapsing, but my application was a straight shot, so that was overkill. Most any aircraft hydraulic shop can put the fittings on for you while you wait, if you need that as well. Not cheap, but it cost less than the driving around I did looking for a solution.
Glad to help. Let us know hot it works out for you. The more you practice, the better it gets each time. So, if it doesn't work from the first time, try it again. Good luck!
I did something similar except I formed it then baked it in a cheap countertop oven I keep in the shop for heating non-food stuff. You can often find them in thrift shops. Give it a chance to become thoroughly heat soaked. The temperature I used was about 325 degrees for 20 or so minutes then let it cool gradually The hose has been holding up just fine without changing shape in use.
It'll come handy for sure. No need to run 10 different stores, wasting hours online searching particular shape for a hose. BTW I've also changed my PVC hose with this method. It does not need as much bend so was whole a lot easier. Thank you for watching!
Thank you for your kind words and watching the video. That's exactly the purpose of my channel - to make something useful and share it with others. Glad you found it helpful!
There's always something goes not according to the plan even with the easiest maintenance. I describe most of thing that could go wrong or went wrong. Again, the more you do that sort of things such DIY, the easier it gets with all the experience you have. Yes, first time you do it maybe sloppy and not as good as you wish, but it gets better with each attempt. Glad you found it useful and thank you for watching!
Putting the hot rubber directly in the freezer after clamping it will make it stronger and ready to use faster. The same with welding plastic, immediately put it in the freezer or use ice cubes and it will be stronger than air cooling!
Cool video, learned some stuff for sure. I was using the same technique recently to flare a hose end so it could fit two different diameters. Had to oversize the object inside to what I needed so when removed it was correct. Similar to you saying it might need over bent. Used basically the same technique but cooled under water and it worked great.
Glad you found useful. Yes, if you sit on something and you're DIY type of guy, you can always come up with a solution that will save you money and time. That's the point! Thank you for watching!
I know this is a way to make hoses that **look** like OEM, but that is not necessarily good or better because OEM is always the cheapest way they can find to do everything. This is a fact. An easier and more likely more long term durable method might be to keep the straight hose straight, and use those spring benders for their intended purpose of bending stainless or aluminum tubing. It will need more clamps but if the bends are metal you will have a very durable solution and the rubber will not be stressed into these shapes that the material does not support. So your example hose would be nearly all metal except the 1-2 inch rubber sections at the end to provide the seal to the connection points. 4 clamps instead of 2 which if done nicely can look very good. Give the metal a little brush and/or polish and it makes your engine bay look very nice.
Kudos at 9:25 I also like to include learning mistakes in my videos when possible. It may not make me look like a genius but it seems like it would be more helpful to the audience. BTW I use a welding table Ill make a video soon and show you what Im talking about.
Good video, might need to try that. I just looped the hose like you did @ 10:39 to get the 90 degree angle, but had plenty of clearance for the loop.No heat needed if you have room.
Yes, if you have plenty of room, you don't actually need to preserve the shape. The whole idea about preserving the shape, so it won't kink. But if you have long range and no more than 90 degree angle then you can simply put a hose as is without preserving a shape. Just keep an eye on it and make sure it does not kink overtime, especially if it is one of the coolant hoses - hot liquid makes it more flexible and it's more likely to kink. Thank you for watching!
@ngtitovWorldOfCars This looks like a great and moneysaving technique. The thought occurs that you may get as good a result without the expense of purchasing bending springs by filling the tube with SAND. That will provide internal bulk and prevent kinking and also absorbs heat so will possibly aid in curing the bend. You could most likely just use corks or garden hose stoppers to seal the sand in the tube and then follow the same technique you used. When it has set and cooled its easy to pour out the sand afterwards. I know sand was used as an aid to bend metal tubes, so no reason why it would not work with rubber.
Thanks for the video, excellent guide and very useful. Another tip is to smear some washing up liquid on the rubber pipe before you cut it with your knife, slices like butter.😀
Use caution. When you pull on the spring the spring will open and when you stop pulling the spring will close if the skin of a finger gets pinched it will hurt so use caution when bending springs and pulling the springs open
Also remember to use a helmet and a floating boat west when you wash your hands. And also to not get hurt when you touch a hose when you water your lawn Is getting vaccinated. You need a booster to be safe from this extremely dangerous activity.
Great video. I knew about springs and I have a heat gun but these demos were helpful esp for an older car that needs new hoses. I would recommend shortening the video to 5 min or a little less. Lay out all the hoses, springs, heat gun etc on a brown piece of paper and name + price next to each one and video and say something like: "today I'm going to uses these tools to make straight hoses to look like this - bent hoses"....
Thank you very much for suggestions and great feedback. I will try to shorten my next videos - those are all great advices you provided. Glad you found it useful! Thank you for watching!
@@ngtitovWorldOfCars you’re welcome and you could possibly add a little bit of background music but just keep the volume of the music way down so you almost don’t hear it. You’ve got good ideas and I like the hose bending because it’s out of the ordinary a lot of channels kind of get a hold of the same types of how to videos and just keep repeating stuff that people already have seen. Also, the hose bending is important on an older car where you’ve really gotta stay on very tight budget Which reminds me of one last tip you could show the cost of the bulk hose in the beginning per foot compared to buying some prevent finished parts at like 5X the price.
@@ngtitovWorldOfCars The gloves retain job memory, they have wisdom, and are like old friends. I use my old gloves for many different things after they are tired of the regular jobs. Stuffed, a pair says a visual Hi to the passers by on one side of the fence. I keep an old pair with the spare tire on each car for changing a flat. The dogs will gladly tear one up after a round of fetch with a ball inside and the end tied shut. . I have used hot water for decades to form hoses, much more even heat. Ice water speeds the setting process. Thanks for your video.
They are external springs for copper pipe. If you are goi g to use them internally, tie some copper cable to the far end and feed it back through the centre amd pull it out usimg that. Otherwise kt doesnt take long to ruin your spring.
I have bent both steel and PVC pipe by heating (with either a torch or heat gun) after filling with well tamped sand and plugging the ends. This technique might well work on hoses. Of course, you'd want to make sure you completely remove the sand from the hose afterwards.
Have you tried just putting some nails or screws in wood to suit the shape. Use some short aluminium tubing over the nails to protect the rubber. Insert the mandrels. Heat the hose while straight so you get the whole way around. Then place in your nail jig. Continue to heat for a minute or so them let it cool, or pour water on it.
I haven't tried that, but I can see it could work. This could be a little more time consuming process, BUT if you need to shape relative long hose where spring tube benders won't reach, this is the way to go for sure!
Boiling hot water and string, wire wrapped around the outside works too. Then you can shape it anyway you want drop it in water for 10 min pull it out and put in the freezer.The steel wire won't get hot enough to melt into the hose
You can also plug one end, fill it with sand, then plug the other end with the same results but it can be used on any length of tubing. You can also use this method to bend PVC pipe.
Can you make a video once you had a customized part in use for a longer time? Curious how the materials will last after the heat treatment and bending. I'd guess they'll last a while, or as a placeholder when on a tight budget, but I'd bet not anything near to a factory made part...
Will do. But just FYI, it's been about 6 months or so since I replaced that a little hose, and I have no problems with that whatsoever. I still stays in the shape I gave, and it doesn't kink. I'll wait for other 6 months and will give an update. Thank you for watching!
You could try making a jig/former/shaper out of plywood/wood/etc and nails (the old preformed hose would be helpful in setting up the jig ) and that one you did in this video could have used a piece of 2x4 and nails or a similar , like dowels . The nails or similar are what form/keep the rubber hose into place while heating and if the heat doesn't work then maybe epoxy/etc might help . I would also try forming the ends so the hose goes on a little easier , if needed .
Another option. Insert a light duty compression spring ( or stretch one) that fits anug to the hose. The prebend will help make a nice curve though. Interesting idea. Will have to keep this in mind.
springs in tubes present as flow resistance and rust. They are good for thinner tubes under vacuum. Rubber compound does not thermo rework.. once heat cured it's set to that shape.
Possibly related TIP: Use wintergreen essential oil (real, not 'aroma' oil) or Simple Green to treat/restore old rubber. Let it soak to restore the oil content in the rubber.
Good tips , never seen those little spring-kits before . The tube would have less 'kink' if had been a little-shorter and able to straighten-out slightly once it heated-up . Dave nz
Yes. I'm glad my viewers are so creative. You're not the first one suggesting sand. Some viewers suggested water (the same concept) and there's one viewer also suggested wooden board, nails, and screws to give it a shape and stick hose in there and bake it. Whichever works best for you. I'm willing to try all these methods next time I need a custom made hose. Thank you for the tip and thank you for watching!
Think if an OEM part is available that would be better. If your hose gets a a kink after some time it may overheat & wreck your engine. Probably ok for the heater hoses though. Thanks for the video.
Like bending PVC conduit pipe. Worked for a company too cheap to buy electric heaters for the job, expected us to heat PVC pipe on a fire, and bend rigid metal conduit over semi trailer tires, it's possible but ain't pretty. Built a good bonfire for bundle of 2" PVC pipe, and didnt work there long.
