Supplier Spotlight

Video Exclusives

The next-gen valvetrain?

gtr

Camcon Automotive has developed a digitally controlled intelligent valve operation, which it states can significantly increases engine economy and flexibility.


EV lap records

gtr

NIO showcases its blistering Nurburgring Nordschleife lap time, as it topples the existing record.


Click here/on image to watch video

Web Exclusives

« back to listing

Inside the Cadillac CTS-V’s LT4 V8

ETi speaks to GM about the supercharged 649ps engine at the heart of its new sedan

by Graham Heeps

 

The 2016 Cadillac CTS-V will launch in the late summer of this year, powered by a 649ps LT4 V8. The 6.2-liter supercharged motor makes 855Nm and is paired with the GM 8L90 8-speed automatic transmission.

The 322km/h sedan’s powertrain is derived from the one in the current Corvette Z06 (see ETi, March 2014), including its cylinder deactivation technology, but there are a number of changes. The biggest is that the LT4 is now wet-sump with an aluminum oil pan, rather than dry-sump, a switch facilitated by the higher mounting position in the CTS-V. Extensive development focused on coping with high levels of lateral g from heavy track use, without losing oil pressure. 

“We took the crankcase ventilation system and created an [oil] storage container to the right-hand side of the engine, from where it drains back into the pan,” says Jordan Lee, chief engineer and program manager, LT4. “It’s pretty close to a race-type dry-sump system, without having a dry sump.” The result is that the CTS-V’s V8 is “a couple of kilos” lighter than the Z06’s and copes with a lateral 1.1g, which compares favorably with the dry sump version’s 1.2g. 

Other changes include new venting of the crankcase pressure through the top of the engine, different engine map calibration, new induction and exhaust systems and a different accessory drive. The guts of the Eaton supercharger are the same as on the Z06, although different packaging means it sticks about 20mm further out. 

Development of the new version has taken two years. An extensive track-testing program proved the performance at GM’s own Milford Road Course (MRC), Michigan, USA, which takes elements of different racetracks around the world, as well as at Virginia International Raceway (VIR), Virginia, and Spring Mountain Motorsports Ranch, Nevada, USA, and at the Nürburgring, Germany.

May 5, 2015
 

 

5 May 2015

Read Latest Issue

International Engine of the Year Awards
Read Latest Issue
Read Latest Issue

Web Exclusive Articles

Engines on test: Toyota 2ZR-FE
A new body, which brings increased strength and lighter weight to the party alongside those looks, plug-in capability, and a solar roof mean that whilst familiar, there's an awful lot of all-new in the 2017 Toyota Prius
Read Now

Lowering Friction in timing chain drive systems
DSM Engineering Plastics outlines the importance of timing chain drive systems in the overall role of the IC engine, and as regulators continue to press for more efficient engines timing chains are the one area that can yield further gains
Read Now

Engines on test: Lexus 2UR-GSE 5.0-liter V8
The 5.0-liter, naturally aspirated Lexus GS F is most definitely party up front, business out back; much like a reverse mullet. Only the Japanese super sedan carries it off with much, much more class - and dignity
Read Now


Supplier Spotlight

Supplier SpotlightClick here for listings and information on leading suppliers covering all aspects of the engine technology industry. Want to see your company included? Contact aboobaker.tayub@ukimediaevents.com for more details.

فروشگاه اینترنتی فروشگاه اینترنتی سیستم همکاری در فروش کانال تلگرام چت روم دانلود فیلم مرکز خرید ایرانیان

Submit your industry opinion

Industry BlogDo you have an opinion you'd like to share with the engine technology community? We'd like to hear your views and opinions on the leading issues shaping the industry. Share your comments by sending up to 500 words to d.slavnich@ukimediaevents.com

Submit Your Recruitment Ad

Recruitment AdTo send us your recruitment advertising or to receive information on placing a banner please email aboobaker.tayub@ukimediaevents.com