Axle issues / annoyance

[ML]

Originally Posted by redlined600

I'm actually surprised it's that close. I would have expected a higher delta between the two.

Here is what I'm planning on adding to shield the heat.
Design Engineering 010450 Titanium Pipe Shield 6" x 1' Exhaust Heat Shield https://a.co/d/9VmdMNG

That's what I just put on, but I haven't tested it on track yet

[blsfrs]

Is the heat radiating just from the area of the pipe below the axle or, when the car is moving at speed, is hot air flowing along the pipe front the front of the car?

I'm finished for the season but neat year I might experiment with more heat shielding farther upstream.

[DocWalt]

Are you guys using the Cusco axle shield as well?

[Matt93SE]

Originally Posted by blsfrs

Is the heat radiating just from the area of the pipe below the axle or, when the car is moving at speed, is hot air flowing along the pipe front the front of the car?

I'm finished for the season but neat year I might experiment with more heat shielding farther upstream.

it's a bit of all the above, but I'd say the majority of the boot problems is radiation off the exhaust in the general area of the CV. air is already hot going through there, but REALLY hot within a couple inches of the exhaust. I've forgotten my college physics, but I'm betting there's a fair amount of blackbody radiation going on here. i.e. "infrared heat lamp effect".

given the temps I see on trans and diff fluid during a race, I would recommend shielding the top side of the exhaust from the firewall to the back of the diff, just for extra insurance. the drivetrain has a fair amount of mass, and even at the end of a 45 min race, my temps are at 290F trans, 270F diff and still slowly creeping up a few degrees per lap.

[strat61caster]

Black body radiation <<<< convection

[blsfrs]

Originally Posted by Matt93SE

it's a bit of all the above, but I'd say the majority of the boot problems is radiation off the exhaust in the general area of the CV. air is already hot going through there, but REALLY hot within a couple inches of the exhaust. I've forgotten my college physics, but I'm betting there's a fair amount of blackbody radiation going on here. i.e. "infrared heat lamp effect".

given the temps I see on trans and diff fluid during a race, I would recommend shielding the top side of the exhaust from the firewall to the back of the diff, just for extra insurance. the drivetrain has a fair amount of mass, and even at the end of a 45 min race, my temps are at 290F trans, 270F diff and still slowly creeping up a few degrees per lap.

If it's mostly convection, then reflective tape on the CV cup should help. Somebody should make white boots too.