RE: What is a 'hot V' configuration? PH Explains

[gofasterrosssco]

CedricN said:

If you can have two twin scrolls in the v you can pair the exhaust runners between the banks with superb separation between the exhaust scavenging. Thus negating much of the drawbacks of a cross plane crank.

Not just that, but gives options for a single, twin-scroll turbo applications being fed from both cylinder banks (possible, but less efficient, Vectra / Insignia VXR engines used a single turbo fed from both banks), and in the future, may allow a more simplified application of 'electrically-assisted' turbochargers..

[Scottie - NW]

PHMatt said:

With the cars they're fitted too usually being £100k motors pushing out 600bhp plus, it's probably best the tuners don't get their filthy mitts on them

Eh? you might want to ask yourself how AMG started. I'd guess AMG, Alpina, Cosworth, RUF etc and so on might make a case for the fact they know what they are doing. If it wasn't for these filthy mitt tuners we wouldn't be enjoying the cars we do.

[xjay1337]

Amanitin said:

Beechie said:

It seems so advantageous that one wonders why it took them so long to think of it. Either that or the fiendish difficulties involved have been rather overlooked.

my thoughts too. The article does not explain why it took so long to adopt this configuration. Heat, sure, but there must be other challenges. Cooling the engine in a confined space has been a problem since WWII.

Quite so.

I guess as most of these cars will be doing low mileages and have warranties their whole lives, it doesn't matter too much.

[Mackofthejungle]

Less turbo lag = bad.

Embrace the turbos.

[dvs_dave]

Onehp said:

As you say it always passes the hot turbochargers, then it is cooled in the IC to a certain temperature which can't be lower than ambient. At this point things could be equal. The air goes to the underside in a hot V config, which makes that the air isn't heated much. On a conventional twin turbo, it goes up, to the same place where all engine heat tends to gather...

The vast majority (95%+) of the heat in the air coming from the turbos is due to that air being compressed by the turbos, not because the turbos are physically hot. You can’t compress air without heating it, and dissipating this heat from compression is what the inter-coolers are for.

[gofasterrosssco]

xjay1337 said:

Amanitin said:

Beechie said:

It seems so advantageous that one wonders why it took them so long to think of it. Either that or the fiendish difficulties involved have been rather overlooked.

my thoughts too. The article does not explain why it took so long to adopt this configuration. Heat, sure, but there must be other challenges. Cooling the engine in a confined space has been a problem since WWII.

Quite so.

I guess as most of these cars will be doing low mileages and have warranties their whole lives, it doesn't matter too much.

Manufacturing, materials technology, engine management, and cost reduction have all came on significantly in the last couple of years for mass-producing engines.

See link below on the latest Audi TFSI V6 and some of the technologies it applies:

https://www.audiboost.com/content.php?7303-Diagram...

[Toltec]

gofasterrosssco said:

Manufacturing, materials technology, engine management, and cost reduction have all came on significantly in the last couple of years for mass-producing engines.

See link below on the latest Audi TFSI V6 and some of the technologies it applies:

https://www.audiboost.com/content.php?7303-Diagram...

Looks like this is a 90 degree engine if derived from a V8, probably makes getting the turbo in the V easier too.