Silicon Turbo Pipe in Normally Aspirated System

**101RRS** · 12th July 2017, 10:10 AM

I have to fabricate an air inlet system for my V8. I have trouble finding rubber angles and joiners so had a look at the rice burner silicon turbo pipe that Supercheap sells. They do not have pipe of a large enough diameter but I have found a place online that does have the right size silicon pipe.

The issue I have is that the silicon pipe is quite squishy and is designed to hold higher pressures inside generated by the turbo. In a normally aspirated system the engine is sucking (with no turbo blowing) so the pressure is lower inside the pipe. I have been advised the low pressure of the inlet may very we suck in the silicon pipe.

So on a normally aspirated engine has anyone used silicon turbo pipe in the inlet system and were there any issues with them collapsing.

Thanks

Garry

**bee utey** · 12th July 2017, 10:36 AM

All the time. Many D1's and similar have soft floppy air intake hoses and when a backfire takes them out replacement by silicone hose keeps them on the road. If your engine creates enough vacuum to suck in a hose I'd say your air cleaner needs upsizing. Anyway, multi ply hoses aren't all that soft and the Holden/Ford idiots use them as required without issue.

**101RRS** · 12th July 2017, 02:27 PM

Thanks - I personally dont know as I have never used the silicon hose - currently there are normal rubber bends in my system and they hold up quite well but they are much more robust than the silicon ones.

Cheers

Garry

**PhilipA** · 12th July 2017, 02:52 PM

I think silicon will be Ok.
Just don't use that convoluted plastic/rubber stuff with nylon coil inside to stiffen it.
I had some on my 3.9 and it sucked in and closed off as I was overtaking up Browns Mountain.
It could have been very ugly.
Regards Philip A

DiscoMick · 13th July 2017, 12:52 PM

No idea really, except that the replacement silicon intercooler and turbo hoses for my Defender 2.4 just arrived and they seem quite stiff, so it's hard to imagine them being more likely to be sucked in than the original rubber hoses, which are quite soft.

**loanrangie** · 13th July 2017, 01:07 PM

On a boosted engine you are only getting pressure after the turbo so there is sucking pre turbo, doesnt cause an issue on any other intake system.

**twr7cx** · 15th July 2017, 01:00 PM

Should be fine, have used it on plenty of naturally aspirated vehicles over the years without issues.

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