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Heat Shield Covering for Tygon Tubing

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Heat Shield Covering for Tygon Tubing

Old 07-19-2016, 12:32 PM
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Default Heat Shield Covering for Tygon Tubing

Hi all,

I have a TF .60 size P47 with a VVRC 20CC Engine. Should I sheath the tygon fuel tubing with a heat resistant covering like the covering I use for the ignition wires? Five flights so far with this engine I don't notice any burn marks on the tubing and none of the tubing actually touches the engine. Does this size engine generate enough heat to warrant concern about melting the tubing?

Also can anyone tell me the proper name of the ignition wire covering shown in the picture below. I can't seem to find it.

Thanks,

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Last edited by Champstarr; 07-19-2016 at 12:33 PM. Reason: Punctuation error
Old 07-19-2016, 01:42 PM
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That is a plastic spiral wrap for cables. See SPIRAL WRAP

Can't help with you fuel tubing question. I've never had a tubing melt problem.
Old 07-19-2016, 01:47 PM
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If the fuel lines are secured a short distance from the engine head and exhaust, the real heat sources in an engine, shielding shouldn't be needed. If the lines are routed fairly close, I'd look at installing a lightweight stainless in between, just to be safe
Old 07-19-2016, 02:09 PM
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Originally Posted by ETpilot
That is a plastic spiral wrap for cables. See SPIRAL WRAP

Can't help with you fuel tubing question. I've never had a tubing melt problem.
Thanks for the info on the spiral wrap. Just ordered some.
Old 07-21-2016, 10:08 AM
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Will the plastic spiral wrap hold up to engine heat ? At what temp does it begin to melt ?
Old 07-21-2016, 11:21 AM
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Originally Posted by TomCrump
Will the plastic spiral wrap hold up to engine heat ? At what temp does it begin to melt ?
Good question, I assume it would hold up because that spiral wrap is included with the ignition system and is recommended to shield the ignition wire that runs from the crankshaft to the ignition module.
Old 07-21-2016, 01:38 PM
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Wikipedia shows the melting point to be 115-135*C, 239-275*F. I use the wrap in my Dodge Ram Turbo Cummins Diesel, no problem.
Old 07-21-2016, 01:41 PM
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Wikipedia shows what plastic ? I've seen some plastics that get soft in sunlight.

Last edited by TomCrump; 07-21-2016 at 01:43 PM.
Old 07-22-2016, 03:00 AM
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Originally Posted by TomCrump
Wikipedia shows what plastic ? I've seen some plastics that get soft in sunlight.
Tom, I looked up polyethylene which is the material listed in the spiral wrap link that I posted. I also looked up tygon tubing melting point. I found one site that listed temps. Most were max 165*F with one high temp tubing listed at 392*F. I could not find any temp info regarding the tygon tubing used on RC engines.

I ran my OS GGT10 on a test stand and I used a temperature gun to get a temperature reading. I can't recall the readings but they were lower than I had expected. I have a new OS 46AX n OS 65AX that I need to run. I'm going to check temp on them and see what I get. I'm temperature curious now.
Old 07-22-2016, 02:30 PM
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If you show no signs of overheating you're good to go. Spiral wrap will melt.
On flex headers we use plumbers tape.
But like I said if your tygon is secure and shows no sign of over heating I'd say your good
Old 07-22-2016, 04:52 PM
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Originally Posted by jetmech05
If you show no signs of overheating you're good to go. Spiral wrap will melt.
On flex headers we use plumbers tape.
But like I said if your tygon is secure and shows no sign of over heating I'd say your good
Simple as that. Thanks.

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