Ranger Exhaust Question?

[85_Ranger4x4]

I meant if you are running it with a open manifold when it is 10 degrees out you might warp a valve. If you have just about anything for an exhaust it shouldn't be anything to worry about.

 

[mudcrazy]

I bought my muffler at MBRP and love the sound. Its nice and rumbley, and has a bit of a bark at around 3000 rpm. Love it and it doesn't sound ricey at all cause i can't stand those things.

 

[sonicboom919]

You guys don't have a clue as to what you are talking about. shady

Well how come race cars run open headers without fear of losing backpressure whatsoever? I know what i'm talking about...headers provide enough backpressure to do whatever you want.

 

[shadetree]

Well how come race cars run open headers without fear of losing backpressure whatsoever? I know what i'm talking about...headers provide enough backpressure to do whatever you want.

They run open headers so there is minimal backpressure. You do not know what the term backpressure means. It is evident from your post. Most racing headers are tuned for a certain level of power. Do a websearch on backpressure, and you will find it's true meaning. shady

 

[shadetree]

I meant if you are running it with a open manifold when it is 10 degrees out you might warp a valve.

And just how would this happen? shady

 

[85_Ranger4x4]

And just how would this happen? shady

Rapid temperature change, kind of like when they squirted liquid on a hot light bulb last night on Mythbusters. Even then it takes a fair amount of luck (or lack thereof) to warp one.

 

[shadetree]

Rapid temperature change, kind of like when they squirted liquid on a hot light bulb last night on Mythbusters. Even then it takes a fair amount of luck (or lack thereof) to warp one.

What is going to cause this rapid temperature change? Cold air will not backup the exhaust into the combustion chamber on a running engine. And, if it did, it is the same cold air that is coming in the intake system, as I stated before. shady

 

[Simple_serf]

I want to thorw an idea out there for those who think that cold air is going to kill your exhaust valves.

I run antique farm engines under full load. Many of these govern themselves by holding the exhaust valves open between firings when idling. Many of these engines have hot heads (no coolant in the heads). most of these have no mufflers. I have gotten the exhaust valves red hot under load, fire out the exhuasts and everything. As soon as you take the load off the engine, fires only when needed and coasts pulling cool air through the valves. These valves are not modern sodium filled and all of that. They are plain hardened steel valves. I have never warped one through all of this.

I know these aren't high performance engines, but it is something to think about.

 

[shadetree]

I want to thorw an idea out there for those who think that cold air is going to kill your exhaust valves.

I run antique farm engines under full load. Many of these govern themselves by holding the exhaust valves open between firings when idling. Many of these engines have hot heads (no coolant in the heads). most of these have no mufflers. I have gotten the exhaust valves red hot under load, fire out the exhuasts and everything. As soon as you take the load off the engine, fires only when needed and coasts pulling cool air through the valves. These valves are not modern sodium filled and all of that. They are plain hardened steel valves. I have never warped one through all of this.

I know these aren't high performance engines, but it is something to think about.

Correct. In the early days, before header technology changed the way things were done, we used to run open exhausts on dragsters, circle tracks, and some even on the street. Usually there was about three or so inches of exhaust pipe, and that was mainly for looks, some didn't even bother with that. The mechanics would watch the flame in the cylinders for tuning the engine. They wanted a nice blue flame. These engines were basically stock, some with a few modifications. We would run them for several seasons without problems. When problems did occur, it was from leaning out and burning stuff up.

Also, when the engine is ice, ice, cold, and you start it up, there is some pretty hot stuff going past that ice cold valve. shady

 

[Chic N Stew]

don't glasspacks on a 2.9 make it sound like a honda civic?

 

[Hahnsb2]

don't glasspacks on a 2.9 make it sound like a honda civic?

Not really, depends on a lot of factors. I ran a single 2 1/2" glasspack with no cat dumped under the cab it was really mean sounding.