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exhaust manifold life

 
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Michael Sargeant
1 BBL (New)


Joined: 01 Jan 2017
Posts: 7
Location: Lincoln, CA

Post subject: exhaust manifold life (Sun Jan 29, 2017 7:56 pm) Reply with quote

I am doing a turbo/propane build on a couple of slants. If I just go with a J or U pipe from the stock exhaust manifold (used/new/Dorman), what is the life expectancy of that manifold ? The first couple will just be grunt motors for hauling in pickups then maybe build something that could break. I believe propane burns a little hotter (104 to 112 octane) so this won' help the grow/shrink.

Alternatively, I could fab. up split 3's out of schedule 40 304 SS. Is that a good idea ?

two 225's and a 170

Any advise is appreciated.

I feel guilty getting the benefit of all these years of wisdom and experience.
This website and the members are very appreciated here.

-- Mike


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jcc
TBI Slant 6


Joined: 04 Jun 2015
Posts: 127
Location: Florida

Post subject: (Wed Feb 08, 2017 7:44 pm) Reply with quote

I am suspicious of your assertion that propane burns hotter and/or has a hotter exhaust, haven't heard/read that. Actually since it is reported to be a cleaner burn, it might be a less corrosive exhaust. So SS is not a requirement, because of propane and definitely no heavy wall stuff like sch 40, it absorbs a lot of heat the turbo likes. SS for Turbo is certainly nice, A HT temp coating would lengthen life of steel tubing, and reduce some ambient under hood temps, you have to decide if the cost/benefit is worthy. Do NOT toy with any exhaust wraps with steel tubing.


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Chuck
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Joined: 12 Oct 2002
Posts: 1381
Location: Grass Valley, Ca.

Post subject: (Wed Feb 22, 2017 5:09 pm) Reply with quote

Mike, call me about the manifold project. I can't find your number.



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Chuck
Site Admin


Joined: 12 Oct 2002
Posts: 1381
Location: Grass Valley, Ca.

Post subject: (Wed Feb 22, 2017 5:20 pm) Reply with quote

Check out this page for a discussion on temperature differences between propane & gasoline.

http://uscarb.websitetoolbox.com/post/exhaust-temperature-propaneng-vs-gasoline-6850826



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Michael Sargeant
1 BBL (New)


Joined: 01 Jan 2017
Posts: 7
Location: Lincoln, CA

Post subject: exhaust manifold life (Sun Mar 12, 2017 9:08 pm) Reply with quote

So, the original question is the life expectancy of a stock exhaust manifold
under turbo conditions. I understand that boost pressures and fuel types
are big variables. What are you guys seeing for durability in general under
turbo applications ?


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Dart270
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Joined: 21 Oct 2002
Posts: 12288
Location: Blacksburg, VA

Post subject: (Mon Mar 13, 2017 9:50 pm) Reply with quote

Ask "Brian" in Pittsburgh. I believe he has a car with a welded stock manifold and turbo... I will try sometime soon with a stock manifold, but not yet. Others have made it work, but maybe not long term on a driver.

How much HP do you want to make and will you tune with a WB O2 (AFR) gauge so it is not lean??

Lou



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