Turbo compounding 

"HammerheadFistpunch" (hammerheadfistpunch) 07/13/2016 at 03:05 • Filed to: None

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Can’t sleep, but I found out volvo still does mechanical turbocompounding

Badass

Sovereign, Purveyor of Coupes > HammerheadFistpunch 07/13/2016 at 03:17

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@ 00:16 is that 3 oil filters?!

Rusty Vandura - www.tinyurl.com/keepoppo > HammerheadFistpunch 07/13/2016 at 03:42

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yeah, but the new Bugatti has FOUR radiators!

HammerheadFistpunch > Sovereign, Purveyor of Coupes 07/13/2016 at 03:42

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Well, 13 liters of displacement and 38 quarts of oil...

Sovereign, Purveyor of Coupes > HammerheadFistpunch 07/13/2016 at 03:44

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Semi truck engine then?

Still yowza. Also neat.

kanadanmajava1 > Sovereign, Purveyor of Coupes 07/13/2016 at 03:47

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It seems so. Heavy duty engines use several quite often. I have seen some that even had a separator system instead of regular filters.

I thought that Volvo had retired their turbo compound engines but I guess thay have revived it. I have heard that the reduction drive had a tendency to crack the block in the older versions.

Scania also had one similar and Detroit Diesel seems to have some versions still in production too.

Sovereign, Purveyor of Coupes > kanadanmajava1 07/13/2016 at 03:51

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That fan clutch looks neato as well. Got any info on it?

MultiplaOrgasms > Rusty Vandura - www.tinyurl.com/keepoppo 07/13/2016 at 04:33

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The old one had ten.

Cé hé sin > HammerheadFistpunch 07/13/2016 at 04:51

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Not just them, Mercedes have the DD15 and Scania make them as well.

You find turbocompound engines in off road applications as well.

kanadanmajava1 > Sovereign, Purveyor of Coupes 07/13/2016 at 04:58

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No info, but it could be some kind of vibration damper. Or just a design done by bored cooling fan engineer.

Sovereign, Purveyor of Coupes > kanadanmajava1 07/13/2016 at 05:01

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I’m guessing that the holes allow the fan to get a good idea of engine bay temps. Either way, I like it.

TheHondaBro > HammerheadFistpunch 07/13/2016 at 05:53

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I don’t even know what that means, but that name alone gives me an erection.

luvMeSome142 & some Lincoln! > HammerheadFistpunch 07/13/2016 at 09:15

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That is badass. I didn’t fully comprehend what was going on at first. So, there is a regular turbo (sitting at the lower right 0:20) and after the exhaust passes through that there is another impeller that scavenges even more energy and drives the crankshaft through a reduction gear. I think that bulbous thing (at 0:46) just after the first reduction gear might be a clutch of some kind, but I’m just guessing.

Rusty Vandura - www.tinyurl.com/keepoppo > MultiplaOrgasms 07/13/2016 at 09:40

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What I find interesting about hypercars is that I find them uninteresting.

MultiplaOrgasms > Rusty Vandura - www.tinyurl.com/keepoppo 07/13/2016 at 09:41

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Dat engineering porn though.

bhtooefr > HammerheadFistpunch 07/13/2016 at 11:24

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IMO, if you’re getting useful power from turbocompounding, and you’re not in a displacement-limited (Formula 1, where the MGU-H is effectively electric turbocompounding) or weight limited scenario (the end stages of piston engined mainline airliners), you screwed up on your expansion ratio.

Make a bigger engine with Atkinson valve timing, then you get to extract more of the energy from the burning fuel, without pumping or compression losses from having to deal with excess cylinder volume. And, then, you get better reliability, as you’re just delivering more torque to the crankshaft through the strong connecting rods, not through some fragile gearbox.

HammerheadFistpunch > bhtooefr 07/13/2016 at 11:57

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I agree with the theory here, but it obviously must be worth the effort if 3 of the major diesel manufactures are doing it.

bhtooefr > HammerheadFistpunch 07/13/2016 at 13:00

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The big reason I can see to use turbocompounding is... Atkinson cycle engines can struggle to spool a turbo, and all of these engines are turbocharged.

So, spool the turbo, then once you’ve got more excess exhaust energy, run the exhaust through the second turbine.

However, I’d go the other way around, myself, if turbo lag is the problem - spool the turbo electrically, then you can use excess exhaust energy once you’re in boost to keep it spinning. Still has reliability issues, but I suspect less than turbocompounding does.

HammerheadFistpunch > bhtooefr 07/13/2016 at 13:02

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I know Volvo is working on electric turbo compounding for trucks as well as passenger cars, I’m excited about it!

Nimbus The Legend - Riding on air like a cloud > Sovereign, Purveyor of Coupes 07/13/2016 at 17:51

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also reduce weight...