Titanium can't take the heat?
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Joined: Feb 2001
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From: Charlotte, N.C.
Originally posted by Matt Hey
A Stainless Steel downpipe would hold in the heat better than a Titanium downpipe (= cooler underhood temps). 321 SS or Inconel (best) is even better at holding in the heat, is more heat resistant, and stronger than 304 SS which most RX-7 downpipes are made from.
A Stainless Steel downpipe would hold in the heat better than a Titanium downpipe (= cooler underhood temps). 321 SS or Inconel (best) is even better at holding in the heat, is more heat resistant, and stronger than 304 SS which most RX-7 downpipes are made from.
The SS DP does a much better job of getting the heat *out* the exhaust than Ti would. A Ti DP would allow more heat to permeate into the engine bay.Darril
fart on a friends head!!!
Joined: Mar 2002
Posts: 4,104
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From: sheppard AFB, TX
burns stainless quotes that titanium shouldnt be used on rotary exhaust systems. id say the only real bad place is close to the turbo where a lot of heat is found. so, downpipes and headers are a "no,no". they also say that stainless isnt considered "good enough" to use on rotaries. that may be why a lot of stainless headers crack. the metal they recommend to use is inconel. . . try getting a good deal on that!!!!
paul
paul
Originally posted by teamstealth
Just out of curiosity...how heavy is Inconel compared to SS and Ti?
Just out of curiosity...how heavy is Inconel compared to SS and Ti?
Dave
Originally posted by rynberg
A SS downpipe only weighs 7 lbs. Why spend so much more money to save another 3 lbs? What a waste of cash.
A SS downpipe only weighs 7 lbs. Why spend so much more money to save another 3 lbs? What a waste of cash.
Originally posted by dgeesaman
For me, I'll save weight by taking a dump before every time I race and save $600. That's like $300/turd.
For me, I'll save weight by taking a dump before every time I race and save $600. That's like $300/turd.
DoO user
Joined: Feb 2001
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From: Almost but not quite, way down South!
They used Titanium on the SR-71 for years and it was exposed to 1000 degrees worth of heat. I'd argue differently.
SS is cheaper and easier to work with though.
If you're looking for something good to make an exhaust system out of inconel aka basic SS is still a good choice and it's much cheaper.
SS is more corrosion resistant than most metals, and also has a low coeffecient expansion.
They use SS on all kinds of exhaust systems, so he's probably right.
You could also look at Nickel-steel alloy. It shares a lot of the properties of SS and titanium but has the added advantage of thermal shock resistance. They use them all over in turbine engines. Imagine being in Alaska say it's -60 below and you go to some hundreds of degrees in a matter of seconds.
However, I've never heard of such a thing in an exhaust set-up, other than stated above. Again cost will be an issue.
SS is cheaper and easier to work with though.
If you're looking for something good to make an exhaust system out of inconel aka basic SS is still a good choice and it's much cheaper.
SS is more corrosion resistant than most metals, and also has a low coeffecient expansion.
They use SS on all kinds of exhaust systems, so he's probably right.
You could also look at Nickel-steel alloy. It shares a lot of the properties of SS and titanium but has the added advantage of thermal shock resistance. They use them all over in turbine engines. Imagine being in Alaska say it's -60 below and you go to some hundreds of degrees in a matter of seconds.
However, I've never heard of such a thing in an exhaust set-up, other than stated above. Again cost will be an issue.
Last edited by Elevation7; Jan 31, 2004 at 02:28 PM.
Senior Member
Joined: May 2003
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From: netherlands
Titanium gets its strength a 500+ degrees celsius. And of course is lighter and stronger dan normal stainless stell. You dont want to use both of them because they dont take up the heat as much as normal carbon steel does.
fart on a friends head!!!
Joined: Mar 2002
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From: sheppard AFB, TX
Originally posted by Elevation7
They used Titanium on the SR-71 for years and it was exposed to 1000 degrees worth of heat. I'd argue differently.
SS is cheaper and easier to work with though.
If you're looking for something good to make an exhaust system out of inconel aka basic SS is still a good choice and it's much cheaper.
SS is more corrosion resistant than most metals, and also has a low coeffecient expansion.
They use SS on all kinds of exhaust systems, so he's probably right.
You could also look at Nickel-steel alloy. It shares a lot of the properties of SS and titanium but has the added advantage of thermal shock resistance. They use them all over in turbine engines. Imagine being in Alaska say it's -60 below and you go to some hundreds of degrees in a matter of seconds.
However, I've never heard of such a thing in an exhaust set-up, other than stated above. Again cost will be an issue.
They used Titanium on the SR-71 for years and it was exposed to 1000 degrees worth of heat. I'd argue differently.
SS is cheaper and easier to work with though.
If you're looking for something good to make an exhaust system out of inconel aka basic SS is still a good choice and it's much cheaper.
SS is more corrosion resistant than most metals, and also has a low coeffecient expansion.
They use SS on all kinds of exhaust systems, so he's probably right.
You could also look at Nickel-steel alloy. It shares a lot of the properties of SS and titanium but has the added advantage of thermal shock resistance. They use them all over in turbine engines. Imagine being in Alaska say it's -60 below and you go to some hundreds of degrees in a matter of seconds.
However, I've never heard of such a thing in an exhaust set-up, other than stated above. Again cost will be an issue.
paul
Joined: Oct 2001
Posts: 4,772
Likes: 2
From: My 350Z Roadster kicks my RX7's butt
Inconel is part nickel. I inquired about both Inconel and Titanium with Burns and my bro-in-laws friend that makes custom cars with titanium. When my engine is in, i'll be making titanium parts (strut bars, toe liks, etc). Anyhow, Inconel is supposed to be like 3x the weight and the price. You better off getting a quality SS DP (with hanger) and 2k degree heat coating (before mounting). Inconel would be a perfect replacement for the turbo manifold ...no more f*'n crakcs!
fart on a friends head!!!
Joined: Mar 2002
Posts: 4,104
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From: sheppard AFB, TX
ss after the turbo is fine in my book. . . its at the header that it MIGHT be a problem. people have been making ss tubular headers for a while. . . i dont think its worth the money to have them made out of inconel.
paul
paul
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