Exceeding Heat Range for bulb seal...what could go wrong? - FFCars.com : Factory Five Racing Discussion Forum

 
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post #1 of 9 (permalink) Old 06-19-2017, 02:10 PM Thread Starter
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Exceeding Heat Range for bulb seal...what could go wrong?

I want to use some bulb seal to fill in a small gab around the custom mounted radiator in my 65 Mustang.

There will be about a 1/4 - 3/8" gap along the top and about a 1/2" - 3/4" gap along the bottom edge.


The bulb seal I'm finding only has a heat rating up to 150 degrees. Here's the stuff I'm finding.
https://www.mcmaster.com/#1120A5

With a 195degree thermostat, I'm sure the surface of the radiator will get hotter than 150.

What happens if EPDM rubber is exposed to temps beyond the rating? Will it just degrade over time, or will it melt & be a fire hazard?

The only other product I can find on McMaster's site that's good for temps up to 212 degrees is something made out of Buna-N foam, but it says it's not for outdoor use. I wonder if that just means it's not UV protected...but I won't really be exposed to UV rays under the hood of the car.
https://www.mcmaster.com/#12335A53


Anyone here a materials expert that can help me out?


Dan


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post #2 of 9 (permalink) Old 06-19-2017, 05:23 PM
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How about a neat bead of black hi-temp silicone?


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post #3 of 9 (permalink) Old 06-19-2017, 07:15 PM
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I don't see an issue with EPDM sustaining 212F. It is regularly specified for applications up to 240F or 250F.
But taking a step back, is it necessary to seal that tiny gap? Likely not... If the radiator core is 18x18, you have 324 square inches. With the gaps you listed below, we are talking about around 17 square inches of area around the core or around 5% of the area of the core. I would call it job well done, as that is likely better than many OEM applications.

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post #4 of 9 (permalink) Old 06-19-2017, 09:37 PM
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Filler strip

Buy a $2.00 Pool Noodle and cut thin strips to fit. Silicone in place.

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post #5 of 9 (permalink) Old 06-20-2017, 12:43 AM
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Silicone bulb seal will have a much higher heat rating. If the epdm has a self adhesive backing it will fail at lower temp but foam will not burst into flames...da Bat

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post #6 of 9 (permalink) Old 06-20-2017, 02:33 AM
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I have been looking to purchase a weber smoker, and one of the aftermarket accessories is a high temp bulb seal for the lid.

Normally I could help with a link, but I am on the road to LCS at the moment. I wi) try to flollow up soon.
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post #7 of 9 (permalink) Old 06-20-2017, 03:06 PM Thread Starter
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Thanks...I'm really wondering if I even need to seal it up. I'm sure it would be better if the edge were closed off...but the gaps are only at the top & bottom and I can probably get them down to 1/4" - 1/8".

Will I really lose that much air flow to that small gap?

The radiator opening is 24x15 - so 360 sq inches of surface
Estimated gap is about 30 sq inches...so it is less than 10% of the surface area that could allow to bypass. Do airflow calculations work this way?

Dan


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post #8 of 9 (permalink) Old 06-20-2017, 03:52 PM
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Were they sealed originally? Plus you have much more radiator than the originals.
I don't think you'll any problems leaving it as is.

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post #9 of 9 (permalink) Old 06-22-2017, 08:24 AM
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I'm sure a grille in front of a rad reduces airflow, more than that which would by-pass your rad from small gaps like that.

Look at the gaps around this guys radiator..

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