what hose to withstand extreme heat?
Discussion
I am going to fit a catch can for oil vapour, instead of having it venting directly into the inlet manifold (Mercedes OM602 engine). The problem is, I must connect a hose from the venting nozzle at the top of the engine to the catch can, and it gets very hot at the nozzle.The OD of the venting nozzle is about 15.5mm (5/8"). Any idea what hose would be suitable to withstand such heat? Here is a picture of where the hose needs to connect to
Edited by Adam32 on Tuesday 11th February 08:17
How ‘extreme’ are we talking? Surely the valve cover doesn’t get that hot - maybe 100C or so but we’re not talking exhaust temperatures? Silicone hose should be fine, that’s what I have on my Exige which is a ‘motorsport’ upgrade for track use venting the cam cover breather to a catch tank!
I imagine silicone hose will be rated much higher temperature than the plastic nozzle anyway
I imagine silicone hose will be rated much higher temperature than the plastic nozzle anyway
Auto silicone hoses do 16mm heater/coolant hose. I’ve used the appropriately sized version of the same stuff on the catch can installed on the winter shed. The hose runs sort of near the block on its way back out of the can down to the original connection on the intake pipe, as well as some of it sitting in the area above the turbo. It’s been perfectly fine for 3000 miles and shows no signs of degradation.
I used mikalor clamps for the connections I had to make.
I used mikalor clamps for the connections I had to make.
paintman said:
It's just a breather hose & not going to reach 'extreme temperatures'.
Most are rubber, plastic (often corrugated) or silicone.
Coloured silicone hoses are very popular as aftermarket fittings.
Plenty of stuff on ebay.
Problem is the majority of silicone hoses are not oil resistant, apart from the expensive FluoroSilicone onesMost are rubber, plastic (often corrugated) or silicone.
Coloured silicone hoses are very popular as aftermarket fittings.
Plenty of stuff on ebay.
It isn't carrying hot oil, I've never seen a silicone hose fail because of oily, watery fumes and on a scale of 1 - 10 of importance this hose is at 1.
With that in mind buy a piece of silicone hose from Ebay for about a tenner and stick it on, you are reading far too much into this simplistic job.
If it happens to be broken down with oily fumes:
It'll be a heck of a long time from now.
It'll happen right in front of you so you can act.
Overall it's a stupid idea anyhow as it's a diesel engine so it's a pointless waste of time.
With that in mind buy a piece of silicone hose from Ebay for about a tenner and stick it on, you are reading far too much into this simplistic job.
If it happens to be broken down with oily fumes:
It'll be a heck of a long time from now.
It'll happen right in front of you so you can act.
Overall it's a stupid idea anyhow as it's a diesel engine so it's a pointless waste of time.
Edited by 227bhp on Tuesday 11th February 10:24
Had a quick look at my Sprinter's breather system a couple of days ago with this thread in mind.
Has a hollow plastic gizmo bolted to the top of the engine with a length of rubbery hose going to the air intake hose on the engine side of the air filter.
Few years ago I replaced about a foot of the breather hose on my V8 RRC as the plenum end had split. Used heater hose of appropriate bore & not had a problem (much the same as Demelitia).
If you're that worried about the heat & non-standard modifications perhaps you'd be best leaving it as Mercedes intended with the hosing they considered appropriate.
ETA Or try & find a flexible metal hose in short lengths. Most ads for that show it as only 10m rolls.
This company do flexible galvanised steel hose in 16mm id & will sell you a metre. A snip at £28.86 +VAT +P&P.
https://www.thehosemaster.co.uk/hose-ducting/marin...
Guess you'll just have to trawl the net until you find something you deem suitable & cheap.
Has a hollow plastic gizmo bolted to the top of the engine with a length of rubbery hose going to the air intake hose on the engine side of the air filter.
Few years ago I replaced about a foot of the breather hose on my V8 RRC as the plenum end had split. Used heater hose of appropriate bore & not had a problem (much the same as Demelitia).
If you're that worried about the heat & non-standard modifications perhaps you'd be best leaving it as Mercedes intended with the hosing they considered appropriate.
ETA Or try & find a flexible metal hose in short lengths. Most ads for that show it as only 10m rolls.
This company do flexible galvanised steel hose in 16mm id & will sell you a metre. A snip at £28.86 +VAT +P&P.
https://www.thehosemaster.co.uk/hose-ducting/marin...
Guess you'll just have to trawl the net until you find something you deem suitable & cheap.
Edited by paintman on Tuesday 11th February 12:43
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