2021 Bronco

[JST]

I mean, it’s not, though. And heat management in an old Land Cruiser with an LS swap is a very different thing from heat management in a vehicle designed with an OEM cooling package from the get go.

How much boost is the 2.3 making when you’re rock crawling? Maybe...a little? But maybe not much at all. Is heat management on a 4 cylinder barely making boost 10x worse than on a V8? No way.

I’ll buy that heat soak can rob you of some timing advance and boost. But I don’t think you’re going to find many Broncos overheating on the trail because their radiators couldn’t keep up with the base engine.

It sounds from a quick google like the 2 liter jeeps do have some overheating issues, but that sounds like a flaw (it occurs at idle, or at cruising speed) with that truck rather than something endemic to smaller engines.

A similar search for Rangers didn’t show anything for the new turbo trucks.

[ZBB]

Originally Posted by FC

Maybe they just need a big ass fan.

I really want a Big Ass Fan...

[JST]

I think the haiku is really cool. You should get one for the new house!

[lemming]

Originally Posted by JST

I mean, it’s not, though. And heat management in an old Land Cruiser with an LS swap is a very different thing from heat management in a vehicle designed with an OEM cooling package from the get go.

How much boost is the 2.3 making when you’re rock crawling? Maybe...a little? But maybe not much at all. Is heat management on a 4 cylinder barely making boost 10x worse than on a V8? No way.

I’ll buy that heat soak can rob you of some timing advance and boost. But I don’t think you’re going to find many Broncos overheating on the trail because their radiators couldn’t keep up with the base engine.

It sounds from a quick google like the 2 liter jeeps do have some overheating issues, but that sounds like a flaw (it occurs at idle, or at cruising speed) with that truck rather than something endemic to smaller engines.

A similar search for Rangers didn’t show anything for the new turbo trucks.

I would like to test your hypothesis with a V8 powered rock crawler.

[JST]

The other thing is that the Bronco doesn’t share some of the packaging constraints of the Jeep. Here’s an interesting deep dive into JL cooling package design.

https://jalopnik.com/the-engineering...ing-1833657453

[ZBB]

Originally Posted by JST

I think the haiku is really cool. You should get one for the new house!

Yes — it would look so much better than the fan in the new family room.

Also thinking the new es6 should work well on our patio...

[lemming]

Originally Posted by JST

The other thing is that the Bronco doesn’t share some of the packaging constraints of the Jeep. Here’s an interesting deep dive into JL cooling package design.

https://jalopnik.com/the-engineering...ing-1833657453

I would be glad to test the limits of the 392 empirically if they make it.

[John V]

The heat created by the drivetrain is roughly proportional to the power output of that drivetrain. Whether you have a big NA V8 making 400hp or a small turbo 4 making 400 horsepower makes no difference. The V8 likely requires a bit more cooling capacity because it's operating at a lower efficiency.

[lemming]

Originally Posted by John V

The heat created by the drivetrain is roughly proportional to the power output of that drivetrain. Whether you have a big NA V8 making 400hp or a small turbo 4 making 400 horsepower makes no difference. The V8 likely requires a bit more cooling capacity because it's operating at a lower efficiency.

I think I understand what you’re saying, but let me ask a specific question:

A turbo by definition uses exhaust gas. And at running temperatures, it’s a superheated metal ball.

In dead air, this seems like a bad thing.

But you’re saying they’re both internal combustion engines and the thermal signature of a turbo six is not much different from a naturally aspirated v8 —is that correct?

I’m asking because I’m being linear. In the v8, the exhaust manifolds will be white hot. In the turbo example you have a white hot turbo (even water cooled) plus the standard exhaust manifold.

The strain on the coolant and fans seem to me to be more in the turbo example more so than the non turbo example.

What I’m not taking into account is frontal surface area for cooling.

[John V]

The amount of waste heat generated is proportional to the power output of the engine, assuming we're comparing modern engines. The fact that the turbo is storing some of that heat is irrelevant. The turbo is taking waste energy (heat) and using it to do work (compress air). They're designed to be hot.