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Author Topic: Breaking Wind  (Read 84112 times)
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revolutionary
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« Reply #330 on: August 23, 2018, 09:09:04 AM »

The EGTs were through the roof and one of the primaries softened up and pushed out of the collector.

When that happened it was shooting exhaust forward and about melted the fuel lines

We borrowed a TIG welder from one of the other racers and did some field repair


Got it fixed and made a 234mph pass
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revolutionary
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« Reply #331 on: August 23, 2018, 09:16:09 AM »

Annnnd on the next pass the same thing happened to the other side....

We fixed it again and ran 237.

The following morning we put some boost in the car and ended up ventilating the oil pan.
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revolutionary
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« Reply #332 on: August 23, 2018, 09:18:43 AM »

Still lots of fun overall


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manta22
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What, me worry?




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« Reply #333 on: August 23, 2018, 10:16:15 AM »

It's a good thing that it did not burn through that fuel line!

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
jl222
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« Reply #334 on: August 23, 2018, 10:18:00 AM »

  DANG.. keep at it, you'll get it and go fast.

                 JL222
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Rex Schimmer
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« Reply #335 on: August 23, 2018, 12:39:56 PM »

I know that your headers are stainless steel, which alloy? 321 is what it should be. Radiant heat, powerful stuff, it is driven by differential temperature and the distance between the hot part and any other parts, as I remember if you double the distance you will reduce the radiant heat transfer by a factor of 8, so you need lots of good reflective shielding and ceramic based insulation and lots of distance between parts, like fuel lines and the heat source. Good air flow over the affected area helps, as it cools the affected parts by convection, it has no effect on the radiant heat transfer.

Sorry to hear you windowed the engine.

Rex
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Rex

Not much matters and the rest doesn't matter at all.
javajoe79
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« Reply #336 on: September 04, 2018, 10:21:49 AM »

I know that your headers are stainless steel, which alloy? 321 is what it should be. Radiant heat, powerful stuff, it is driven by differential temperature and the distance between the hot part and any other parts, as I remember if you double the distance you will reduce the radiant heat transfer by a factor of 8, so you need lots of good reflective shielding and ceramic based insulation and lots of distance between parts, like fuel lines and the heat source. Good air flow over the affected area helps, as it cools the affected parts by convection, it has no effect on the radiant heat transfer.

Sorry to hear you windowed the engine.

Rex

Definite good points. I talked with Daryl after speedweek and mentioned some 321 schedule 40 manifolds to replace the headers. Hopefully he'll bring me the car again and we can make that happen along with some more thermal management. Big difference in dealing with heat in 1 mile vs 5.
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