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PBB
post Mar 22 2006, 06:26 PM
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Here's some pics of a compound twin turbo setup on a Cummins.





Like the name implies, compound turbocharging compounds the boost. The first turbo compresses the air charge to ~30 psi* into the second turbo which yields ~60* pounds of boost into the intake manifold. (*Arbitrary numbers)
How does the second turbo not surge, spin twice as fast and blow up? Simply, compressor surge and compressor speed are not directly related to the amount of airflow through the turbo but rather the amount of boost the turbo is trying to create. While both turbos are creating ~30 pounds of boost more than the inlet pressure, they are behaving the same.

The above explanation is assuming two equal sized turbos, some of the truly insane compound setups involve two "small" 90mm+ turbos right off the header pressurizing the inlet on a massive 100mm+ single turbo. These are the 100-150psi 2,000-4,000bhp engines used in tractor pulls.
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clarkma5
post Mar 23 2006, 01:10 PM
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I was just waiting for somebody to confuse it with sequential turbos...

It's a cool idea; seems like it offers a lot of the benefits of sequential turbos without the problems of trying to make the pass off from small to large turbo smooth and predictable.
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Posts in this topic
- PBB   Diesel Compound Turbocharging   Mar 22 2006, 06:26 PM
- - PBB   More pics: http://www.texasdieselworks.com/twinspi...   Mar 22 2006, 06:53 PM
- - BankieVR6   that is a cool looking turbo setup. interesting st...   Mar 22 2006, 08:23 PM
- - DakianDelomast   Uh been around for awhile. Ever hear of sequentia...   Mar 22 2006, 08:45 PM
- - fiber optic   How fast do turbos typically spin? I'm going ...   Mar 23 2006, 06:03 AM
- - Mr b00st   that's an interesting setup. I am such a dies...   Mar 23 2006, 12:30 PM
- - PBB   QUOTE(DakianDelomast @ Mar 22 2006, 11:45...   Mar 23 2006, 12:32 PM
- - clarkma5   I was just waiting for somebody to confuse it with...   Mar 23 2006, 01:10 PM
- - DakianDelomast   Its the exact same concept as a sequential turbo.   Mar 23 2006, 01:56 PM
- - Espen   Wonderful images I know diesels are less affecte...   Mar 23 2006, 02:00 PM
- - PBB   QUOTE(clarkma5 @ Mar 23 2006, 04:10 PM) I...   Mar 23 2006, 02:04 PM
- - clarkma5   QUOTE(DakianDelomast @ Mar 23 2006, 01:56...   Mar 23 2006, 02:04 PM
- - DakianDelomast   Why wouldn't you want an intercooler....?   Mar 23 2006, 02:13 PM
- - PBB   QUOTE(DakianDelomast @ Mar 23 2006, 05:13...   Mar 23 2006, 02:28 PM
- - DakianDelomast   Uhm not really. Intercoolers offer a bigger advan...   Mar 23 2006, 02:38 PM
- - PBB   As if 60-100psi wasn't dense enough? My point...   Mar 23 2006, 02:50 PM
- - clarkma5   Dayum PBB, that's what we call OWNAGE   Mar 23 2006, 02:56 PM
- - DakianDelomast   Dude PV=nRT. If you take two gases at the same pr...   Mar 23 2006, 02:59 PM
- - clarkma5   You're talking about changing (delta)p from 85...   Mar 23 2006, 07:19 PM
- - DakianDelomast   Wtf? I'm not talking about changing the press...   Mar 23 2006, 07:21 PM
- - Jordan   i agree with dakian... intercoolers no matter that...   Mar 23 2006, 07:33 PM
- - clarkma5   QUOTE(DakianDelomast @ Mar 23 2006, 07:21...   Mar 23 2006, 07:52 PM
- - PBB   Also consider the difficulty of making an intercoo...   Mar 23 2006, 08:20 PM
- - Halflifehavock13   QUOTE(PBB @ Mar 23 2006, 11:20 PM) If you...   Mar 28 2006, 05:07 PM
- - PBB   QUOTE(Halflifehavock13 @ Mar 28 2006, 08...   Mar 28 2006, 05:50 PM
- - DakianDelomast   PBB you know they use intercoolers on Semis right?   Mar 28 2006, 06:32 PM
- - PBB   I've worked on semis. Those turbos are rather...   Mar 28 2006, 06:36 PM


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