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Silicon Couplers...sickening`

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Old 08-09-2007, 02:03 PM
  #1
orion1973
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Default Silicon Couplers...sickening`

Dear All;

Thsi is really getting frustrating...I have a Zenoah 260PUM engine on a deep vee running a wet tuned pipe system but it likes to burn though silicon couplers like no body's business. Can any body recommed a good source and a good make of high temp hoses/ silicon couplers etc that won't melt so easily?

Thanks
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Old 08-09-2007, 04:49 PM
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Default RE: Silicon Couplers...sickening`

I see very few people over here running couplers on their gas engines. They usually use a metal pipe that slides onto the metal header.
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Old 08-09-2007, 05:05 PM
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Default RE: Silicon Couplers...sickening`

are you sure you have enough water flow? Too little water will cause excessive temps in that exhaust system.
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Old 08-10-2007, 05:11 PM
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Default RE: Silicon Couplers...sickening`

The silicon connector is just as the name implies, a coupler, not an extension of the header. It's not supposed to bridge a gap between the header and the pipe. As Chuck indicates, the header to pipe gap must be bridged with an aluminum pipe placed inside the silicon coupler. Idealy the header should slide inside the pipe and the coupler simply covers and secures that connection so you don't get exhaust leaks.
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Old 08-10-2007, 09:26 PM
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Default RE: Silicon Couplers...sickening`

Teflon couplers are your friend. You may have to heat a little bit to get it to slide over the pipe, but they wont burn up as easily as the silicon couplers (use to go through one bout every tank in my old nitro cat ) . Ive never even had a header o-ring burn up cause i only use teflon o-rings [8D]

But like others have said... the coupler isnt meant to have much gap between the header and pipe inside it. I suspect where yours are burning out is inbetween the header and pipe and the coupler is basically splitting in half...?

www.rocketcityracing.com i do believe sells the teflon couplers.
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Old 08-11-2007, 03:26 AM
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orion1973
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Default RE: Silicon Couplers...sickening`

Thanks for the info...welll strange enough, the coupler for my Enforcer Magnum setup comes stock to bridge gap between header and pipe. Both header and pipe are the same diameter neither one goes over or into the other. And in the instructions, it also states that there must be a small gap in between both to ensure no rubbing of metal to produce radio glitces.

Another advice on water cooling, how to increase the amount of water? My setup uses a water pump also default from enforcer.

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Old 08-11-2007, 02:14 PM
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Default RE: Silicon Couplers...sickening`

If you are running a high octane gas you will develop more heat in the exhaust than you will with a lower grade gasoline but that is still excessive temperature for a silicone coupler. Alcohol based fuel burns at a lower temperature than gasoline , that is the reason silicone couplers are better suited to glow powered boats but when you dump the nitro can in the tank the temp comes up on them too.. BTW There are several types of Silicone , I like the Blue Aerotrend myself.
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