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The mkiv Supra Owners Club

Hose temp limits


Guigsy

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Hi guys.

 

My turbo water cooling hose popped the other day. Thankfully i was in the mcd's drive through 5 mins away from home so managed to get home ok.

 

I tend to not know anything about car stuff but i can throw a spanner at things if i need to. And i figured, i know i have some hose. I know i can fix this.

I pulled the hose off. it was old and basically crumbled...

 

I took off the heat wrap (as its right next to the hot side of the turbo and near the exhaust) and rummaged through my boxes of car bits and found some silicone hose the right size. Hooked it up, put the heat wrap back on, topped up the coolant and went for a test drive. All good.

 

Then i'm thinking, can this silicone hose take this temperature. so i jump online and figure ill just check demontweaks. That will tell me the temperature ratings of the hose.

 

This is the same as my old hose - https://www.demon-tweeks.com/uk/automotive-plumbing-solutions-400-series-push-on-oil-fuel-hose-553140/

It like a double wall. textile reinforced, quite tough feelng stuff. - 120degC

 

I replaced it with your average silicone vac hose type stuff - https://www.demon-tweeks.com/uk/samco-silicone-vacuum-tubing-standard-colours-247869/

apparently 200degC

 

But my gut is telling me that the silicone hose realy isn't up to the job. the supra is my only car at the moment as my daily is having some work done. So i don't want to commute with it for 40 mins on the motorway on Monday with a shitty hose.

 

What do you guys think? gonna be ok. Or should i just order some of the old hose.

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Its heat transfer from the core of the turbo, a while back a car I bought used the same double wall, textile reinforced hose, and it went hard as a rock.

The only option (in my eyes) is get a hard pipe to run from the turbo as far as you can then link it with a normal coolant reinforced hose to the car circuit

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The silicone hose you've linked is unreinforced tube so I would not be using it for a pressurised coolant hose at all, as it's not designed for that application. Textile or nylon plies in the hose are what allows it to withstand positive pressure (as opposed to vacuum) so I would look for a textile reinforced silicone hose.

 

How were you clamping the rubber hose you were using before? It's rated to 20bar so if you are using the standard spring clamps they may not have the required force to clamp the hose down properly, as the aftermarket hose will be much more rigid than an oem hose would be.

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The silicone hose you've linked is unreinforced tube so I would not be using it for a pressurised coolant hose at all, as it's not designed for that application. Textile or nylon plies in the hose are what allows it to withstand positive pressure (as opposed to vacuum) so I would look for a textile reinforced silicone hose.

 

How were you clamping the rubber hose you were using before? It's rated to 20bar so if you are using the standard spring clamps they may not have the required force to clamp the hose down properly, as the aftermarket hose will be much more rigid than an oem hose would be.

 

cheers. it was an aftermarket hose not an oem one to start with. and it had hose clamps on it. i didnt have an issue with it coming off. its always been fine. it split in the middle of the hose.

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Its heat transfer from the core of the turbo, a while back a car I bought used the same double wall, textile reinforced hose, and it went hard as a rock.

The only option (in my eyes) is get a hard pipe to run from the turbo as far as you can then link it with a normal coolant reinforced hose to the car circuit

 

This, get hard pipe on and move the flexi hoses away from the turbine housing, use the stock turbos as an example of how far away they need to be, but at least a few inches.

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