Hot manifold

[markley02]

And I thought seeing a turbo glow was cool. Check this out!

[99SL2_Modder]

Someone's driving a bit hard. :lol:

I saw an evo dyno do that through the grill. It's friggin awesome when they light up like that.

[TehWagon]

holy crap :eek: that CAN'T be good for it!

[99SL2_Modder]

holy crap :eek: that CAN'T be good for it!

Not for prolonged periods of time.

That's usually indicitive of very high EGT's. It's NOT uncommon at all of turbo mainfolds/turbo's/turbo downpipes to glow under high RPM runs.

*edit*
It's the reason why a lot of people heatwrap their stuff, so the lines near it, if they were to touch it, wouldn't melt.

[TehWagon]

all is clearer now... man i have 'learnt' a lot today!

[99SL2_Modder]

all is clearer now... man i have 'learnt' a lot today!

I act like a newbie, but I really know stuff. Hopper's said it before, because we had long as hell discussions on some mechanics and the like.

Back to the act.

Darrrr...learnt? Hehehehe. Look at the avatar.

[DropTopChevy]

Ive seen a video of a porsche from behind on a dyno with its headers glowing purple and white

Miller

[99SL2_Modder]

Ive seen a video of a porsche from behind on a dyno with its headers glowing purple and white

Miller

Yeah, that's bad.

White = way too high of an EGT.

[S4toSTI]

for those who haven't seen this one


http://video.google.com/videoplay?docid=-236345357158387520&q=f1+engine&pr=goog-sl

[Little G]

Wow , i've never seen that before....I don't think thats good.

[2point4DSM]

I've got a feeling the orig pic is of a motor on a motor dyno probably revving at top rpms for a quite a while. I've seen this setup several times on tv and adds.

Wow , i've never seen that before....I don't think thats good.

Take a look at your exhaust manifold in the dark after a I think a good 1/4 mile run. Like mentioned, it is actually common for turbo cars. The reason why our manifolds our a lot beefier than N/A manifolds. Because this kind of abuse does cause the manifold to crack sooner.

Also, heat sheilds are used to protect wiring and other stuff in the engine bay. Heat wrap is mainly used to help keep the heat in the exhaust to speed the flow of it and therefore produce more power.

Problem with using heat wrap is that is causes the exhaust parts to get hotter than normal and therefore leads to those parts failing sooner.

Another problem with heat wrap is that it holds moisture against the pipe more and therefore will cause it to oxidize faster.

[WRX27]

That vid. is crazy. Thanks for the good info.

[99SL2_Modder]

I've got a feeling the orig pic is of a motor on a motor dyno probably revving at top rpms for a quite a while. I've seen this setup several times on tv and adds.



Take a look at your exhaust manifold in the dark after a I think a good 1/4 mile run. Like mentioned, it is actually common for turbo cars. The reason why our manifolds our a lot beefier than N/A manifolds. Because this kind of abuse does cause the manifold to crack sooner.

Also, heat sheilds are used to protect wiring and other stuff in the engine bay. Heat wrap is mainly used to help keep the heat in the exhaust to speed the flow of it and therefore produce more power.

Problem with using heat wrap is that is causes the exhaust parts to get hotter than normal and therefore leads to those parts failing sooner.

Another problem with heat wrap is that it holds moisture against the pipe more and therefore will cause it to oxidize faster.

Word. I mentioned the dyno part too.

But heat wrap also keeps underhood temps low, and it's significantly cooler to touch than a header, so it works also to keep the wires from melting. Heatshields work better though.

Heat wrap holds moisture against the pipe, etc etc. But the thing that should be mentioned is that it's not an all around oxidation, it's spot oxidation which will cause significantly more problems than full oxidation.

[markley02]

nice vid!!!

[TurboTagTeam]

I've also heard that heat wrap can shorten the life of a manifold. The reasoning I heard was that when the manifold is wrapped there is no where for the heat to go. So if degrades the metal over time. My manifold in my car use to glo red after running it hard. I don't think thats to uncommon for an equal length manifold though.

[alachua]

That is why it is a good idea to ceramic coat any manifold that you intend to wrap. That will protect it from oxidation caused by the wrap holding in moisture. It will also aid in keeping the heat inside the manifold, keeping the exhaust gasses moving faster.

-Cliff

[99SL2_Modder]

That is why it is a good idea to ceramic coat any manifold that you intend to wrap. That will protect it from oxidation caused by the wrap holding in moisture. It will also aid in keeping the heat inside the manifold, keeping the exhaust gasses moving faster.

-Cliff


Mmm, but if you get a crack, you're SOL since you can't weld over the ceramic coating. It's a double edged sword.

[77F-150]

"thats hott"

[99SL2_Modder]

"thats hott"

So drop it like it is.

[2point4DSM]

I've also heard that heat wrap can shorten the life of a manifold. The reasoning I heard was that when the manifold is wrapped there is no where for the heat to go. So it degrades the metal over time.

The biggest reason the manifold cracks is because of heat cycling. Expansion and contraction eventually takes its toll. With heat wrap the manifold gets much hotter.

My manifold in my car use to glo red after running it hard. I don't think thats to uncommon for an equal length manifold though.

It has nothing to do with equal length runners. Simply, you were beating the snot out of the car, haha.

Running really lean can make your manifold glow. This can be seen with EGT meters.