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The Car Thread

Werewolfen

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I've always liked old low tech wood burning powered vehicles. A lot of cars in Europe were converted over to run off of the by-product gases produced by burning wood in WW2.

Some of these cars bring to mind images of a Mad Max world where gasoline is rare or either non-existent.

http://www.lowtechmagazine.com/2010/01/wood-gas-cars.html
 

Werewolfen

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I watched that video and I like that car. I never heard of or saw a Tatra 603 car before. I had to look it up. I was stunned to find out it had an air-cooled V8 in the rear. 94-to-105 HP.

v8_tatra_603.jpg
 

93JC

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Jay Leno owns an 87, a predecessor of the 603: http://www.jaylenosgarage.com/video/tatra-t87/277881/

Tatra was known for having developed very aerodynamic cars in the 1930s with rear mounted, air-cooled engines. In fact Tatra accused Volkswagen of having based the design of the Beetle on the prototype Tatra V570. See http://en.wikipedia.org/wiki/Tatra_V570 . Eventually they settled out of court.

Tatra, being a Czechoslovakian company, was forced to produce only a certain number of cars under the planned economy of the communist Czechoslovakian state after the Second World War. Skoda was 'given' exclusive licence to build passenger cars after the war but the Tatra employees fought with the government to be allowed to continue to produce cars, in addition to the state-mandated production of trucks. The 603 was the second post-war product they made, produced from the '50s until the mid-'70s. It was replaced by the 613, essentially a heavily re-engineered version of the 603 with a more contemporary body. After the Cold War ended Tatra made one last passenger car, the 700. Production only lasted a couple years and few cars were sold.

Tatra now only builds trucks, focusing on the production of heavy-duty off-road models for the construction, mining, forestry and oil & gas industries; they build everything from 4x2 to 4x4, 6x6, 8x8 and even 10x10 models. They're the biggest independent automotive manufacturer left in the Czech Republic (Skoda having been gobbled up by Volkswagen, of course).

It's sad that Tatra was crushed under the communist regime. Unlike most Eastern Bloc cars Tatras were built to very high standards, were of excellent quality and had very innovative designs. By comparison Skodas were plebeian, and most cars from other Bloc countries were cheap knockoffs or licenced copies of other manufacturers' cars (Ladas and FSOs from Russia and Poland were Fiats, Dacias from Romania were Renaults, Moskvitches were mostly copies of Opels, older ZILs were almost exact copies of Packards, etc.).
 

Werewolfen

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It can be hard these days finding a mechanic that knows how to adjust a carbureted engine being as most newer model vehicles are fuel-injected. A lot of the time you have to find an old timer mechanic that's familiar with older model vehicles. I replaced the factory 22r Aisin brand carb on my Toyota 4wd with a better performance Weber carb and have had 3 different mechanics try to adjust it right and I've still had problems. It's been rejetted twice even. Thin air elevation and trying to find someone familiar with a specialty performance carburetor to set it up right is a P-I-T-A. :shrug:
 

Nocapszy

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skads of those old cobras around my area.
why did they change the body style to its current disgraceful shape?
they had it right 50 years ago.
 

Nocapszy

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Current shape...?
true enough.
i've almost never been a fan of any mustang body style.
in the 90s, i think ford really lost its stride.
not sure what they were trying to pull off.

but the current shape is egregiously over-aggressive.
 

93JC

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true enough.
i've almost never been a fan of any mustang body style.
in the 90s, i think ford really lost its stride.
not sure what they were trying to pull off.

but the current shape is egregiously over-aggressive.

Ah, you're referring to the GT500.

The car in DiscoBiscuit's post is a Daytona (Cobra) Coupe. That car isn't a Ford.
 

93JC

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There was the Mustang SVT Cobra, which was named after the original Shelby/AC Cobra, but never really had anything to do with the Cobra at all. Ford built those from the early '90s to about 8-10 years ago.
 

SD45T-2

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Am I the only one excited about the new Holden-based Chevy Caprice? :unsure:
 

SD45T-2

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DiscoBiscuit

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The changes to posting images make this much more difficult than it already was.... :dry:

The Monoturbo

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We often forget that one, if not the most important, aspects of motorsports is the development of new technologies. Pretty much every last bit of gadgetry, innovation and evolution that has been applied to your everyday road car has in some form or another trickled down from its original use in motorsports. From turbocharging and fuel injection (mechanical & electrical, indirect & direct) to automated gearboxes (single and double clutch) and everything in between has come to us thanks to the million of dollars of research and development and outright testing that manufacturers do along with their race teams. While further evolution may seem difficult considering how far the internal combustion engine and the motor car in general have come in the last 100+ years, there are still plenty of ideas worth exploring, especially seeing the pace at which hybrid and electric motor technology is advancing. And this is exactly why nerding out on some technical stuff now and again can really be exciting, especially when you can see the obvious links and potential that it can all have on future sports cars.

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After seeing the awesome performance of the Audi R18 e-tron quattro at this year’s Le Mans I decided to read up on the car’s driveline and power train, just to see what on earth made it so blisteringly quick and outright untouchable. Needless to say I was impressed by what I discovered.

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While it’s very interesting that Audi partnered up with Williams to develop their hybrid e-tron (AWD) drivetrain, which functioned rather differently to the Toyota TS030 KERS system (RWD), it’s the engine side of things that really grabbed my attention. Audi serves as the perfect example of how R&D can be applied to not only adapt to new racing regulations, but also push technology to extremes. Back in 2006 when they first won Le Mans with a diesel-powered car, the R10 TDI, they were running a twin-turbocharged 5.5L V12 monstrosity of an engine. This year’s R18 e-tron quattro managed the same feat with an engine running half the numbers of cylinders, 32% less capacity but able to power the car, along with the e-tron hybrid AWD system, to faster lap times. Amazing as that may be it’s the actual way in which they designed the 3.7L turbocharged V6 diesel engine that is most impressive…

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…and notice I said turbocharged, not twin-turbocharged. That’s because Audi, along with its long- standing turbo partner Honeywell Garrett came up with the “monoturbo.” It’s a simple idea but one that has required a rethink of some key engine aspects, most obvious of all the angle between the two banks of three cylinders, set at 120 degrees, and the exhaust side of the heads which have to obviously be located towards the inside of the “V”(hot side inside if you will). This allows the two exhaust manifolds to connect up to the hot side of the turbocharger and flow exhaust gasses radially into it, spinning the turbine via its variable geometry vanes. Once they have done their job exhaust gasses are dumped through the axial outlet that you can see above, onto the exhaust itself.

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Here is a better view of the monoturbo, its hot side towards the bottom, wrapped in heat shielding and the compressor side, which seems to be coated in some kind of heat-resistant ceramic finish. Once aspirated through the intake restrictor the air gets compressed in the visibly small compressor (designed this way to allow the best possible response) and then sent to each bank of cylinders…

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…via the two above outlets. The carbon fiber enclosed control unit on top of the turbocharger assembly controls the Variable Turbine Geometry (VTG) system, which continually adjusts the angles of the vanes on the turbine wheel to make sure there is no lag in throttle response and power. This is also guaranteed during gear shifts, thanks to clever use of electronics, something that apparently surprised even the ACO, the Le Mans organizer when the technical stewards were going through the engine data.

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It’s all fascinating stuff and hopefully technology that will eventually trickle down onto road engines, and maybe also gasoline engines. BMW has already done something similar when it comes to turbocharger placement in their current generation of twin-turbo V8 gasoline engines that power the 5, 6, X5, X6 and 7 series (including the M5, M6, X5M and X6M). The V8′s “hot side,” like Audi’s TDI V6 monoturbo, has been located on the inside of the “V” and the two turbochargers positioned within it (literally on top of the engine). This, coupled with the cross-flow exhaust manifold which times offset pulses into the correct scrolls of the turbos, helps keep piping short and the adoption of charge coolers rather than intercoolers all make the engine as responsive as a naturally aspirated motor would be.

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Here is a side view of the 3.7L TDI, where you can see the monoturbo placement and angle as well as interesting components like the carbon fiber intake manifolds and the carbon casing for the dry-sump’s oil tank in front of the motor. When looking at advanced race engines like this diesel V6 it’s hard not to wonder when we will be able to see powerplants like this make it onto production cars. I’d personally love to see a future RS model powered by something similar, gasoline of course! Maybe and RS version of the future R8? Audi failed a few years ago when they tried to twin-turbocharge the R8′s V10, with a pair of test cars catching fire on the Nordschleife. A centrally mounted monoturbo seems like the perfect solution, good for power, packaging and in the case of a mid-mounted engine, probably even cooling.

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If that will ever happen it may well be joined by a similar hybrid system to the R18′s e-tron to power the front wheels. It’s all exciting stuff and as long as engineers continue to make these innovative engines feel as responsive and immediate as enthusiasts expect, then we have exciting times to look forward too.

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The R18 also hides other interesting technology; of course composites make up the majority of any race car, and to save weight in critical areas Audi Sport even made the car’s gearbox casing out of carbon fiber. Pretty wild right?

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Oh and let’s not forget the now-closed (new LMP regulations) tub part of the chassis, which seen here from this angle in its naked pre-paint state strangely looks like a closed cockpit F1 car!

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What do you guys think, will the monoturbo developed in conjunction with Garrett Honeywell be something we can expect to see in the future on road cars? It makes sense in so many ways and is such a great example of the importance of motorsport.

Images courtesy of Audi Motorsport



Audi Global Website



-Dino Dalle Carbonare
 
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