[Nissan4Life]

Was out playing behind my house this weekend. This time of year you drive through a lot of puddles that are iced over. Is there any concern about quenching of a hot exhaust in ice water.

That is Squaw Valley Ski area in the back ground.

 

[RedDR]

Nope. None. Nada.

 

[Clint]

Just drive it and enjoy it.

Clint

 

[Skibane]

Now it's TEMPERED steel!

 

[Zedbra]

I love going through deep mud and getting the exhaust to smolder. Don't worry about it.

 

[drobs]

I like your chains!

 

[murphy]

I was on NEXterra’s Halloween night run a couple of weeks ago. We had a couple of significant rain storms the week before. Over 3 1/2” each storm. One rig came to the first big puddle in a way that the water splashed up intoto the engine bay. It quenched the passenger manifold bolts. They sheared off at the block. One of the guys with us is a Nissan tech. He said the cold water suddenly cooling the bolts caused them to become brittle, shrink and shear off.

This is the first time I’ve heard of this happening. I’m not sure how often this happens, or even how likely it is to happen. I would imagine the manifold heat shield protecting that area.

It happened to an Xterra. Makes it a possibility for Frontiers too.
North East Xterra Club ? View topic - Bear's Halloween Growl

 

[shift_RUSH]

Forged in Fire! The ancient alchemists/blade-smiths superstitiously believed that 'quenching' required thrusting a red hot blade thru a slave. Hope they reused those slaves. :surprise::serious:
Betting the slaves of yore did a happy dance once it was discovered quenching could be accomplished in oil.

 

[Mathster]

Now it's TEMPERED steel!

technically, hes quenching the steel.
then reheating again to allow to air cool would be the tempering

I deal with alot of metalurgy, so heres my take
we're running a stainless exhaust that would need to be around 1000 degrees C to truely quench the material. This will strengthen the material but make it less elastic. the tempering phase is when you reheat the steel to 800C or so and allow it to air cool.
A naturally asperated gas engine is going to see in the 500 to 600 degree C range at the manifold under heavy load.

Short answer, youre not getting it hot enough to quench and temper your exhaust, and if you do, youre not going to change the material characteristics enough to affect the function. altho you may rust some lower grades of stainless and alloy steels by water cooling.

 

[Nissan4Life]

I like your chains!

Alpine Sports 2326 for 265/75/r16 is a little tight. Trying to get a hold of some super sports. I was with my kids and made it to good spot to stop and do some cross country skiing. We had come up a icy off camber section that was a little sketchy. Asked the boys if they wanted to go higher: yes. So I threw on some chains. Amazing the amount of control one gains by a set of chains on snow/ice.

Forged in Fire! The ancient alchemists/blade-smiths superstitiously believed that 'quenching' required thrusting a red hot blade thru a slave. Hope they reused those slaves. :surprise::serious:
Betting the slaves of yore did a happy dance once it was discovered quenching could be accomplished in oil.

Funny chet

technically, hes quenching the steel.
then reheating again to allow to air cool would be the tempering

I deal with alot of metalurgy, so heres my take
we're running a stainless exhaust that would need to be around 1000 degrees C to truely quench the material. This will strengthen the material but make it less elastic. the tempering phase is when you reheat the steel to 800C or so and allow it to air cool.
A naturally asperated gas engine is going to see in the 500 to 600 degree C range at the manifold under heavy load.

Short answer, youre not getting it hot enough to quench and temper your exhaust, and if you do, youre not going to change the material characteristics enough to affect the function. altho you may rust some lower grades of stainless and alloy steels by water cooling.

We probably went through 30 or so puddles on the trip. Some of them up to the bottom of the door. A couple of the high elevation ones were completely frozen. The lower ones would throw ice chunks onto the hood.

Is the OE exhaust stainless? Looking under the truck at stops, everything wet except for the exhaust. ANd yes mine is starting to look pretty rusty.

 

[Mathster]

Is the OE exhaust stainless? Looking under the truck at stops, everything wet except for the exhaust. ANd yes mine is starting to look pretty rusty.

I thought everyone went to stainless steel.

 

[drobs]

Have Thule chains for my truck: