Momentum - September 2019 - 26

TODAY'S

ENGINEERING

ENGINEERING THE
2020 CHEVROLET CORVETTE
TWO DAYS BEFORE the 50th anniversary
of astronaut Neil Armstrong's leap for
mankind and 10 years after General
Motors emerged from bankruptcy, the
camouflage was finally ripped from the
eighth-generation (C8) 2020 Chevrolet
Corvette. As widely anticipated, C8
now flaunts a mid-engine layout that
ostensibly puts it on equal terms with the
world's most venerated supercars.
After six decades of experimentation
and concept-car teasing, GM
acknowledged that the new Stingray will
enter production before year's end. The
truly shocking announcement is a base
price less than $60,000, barely $4,000
more than today's front-engine C7. Along
with moving the cockpit forward 16.5
inches (419 mm) to facilitate shifting of
the engine rearward, the new Corvette is
an innovative mix of novel and traditional
engineering solutions.

NEW V8 AND DCT
POWERTRAIN
GM's new LT2 fifth-generation small-block
V8 may have roots extending back to 1955,
but it brings a long list of new features to
the party. Its aluminum block has revised
oiling and venting arrangements in
support of a dry-sump lubrication system
with one pressure and three scavenge
pumps. The sump casting is shallower
to allow for mounting of the engine 1 in.
(25 mm) lower in the car versus C7. The
crankshaft nose is longer, to power revised
accessory drives. There's an oil reservoir
mounted at the top-left corner of the
engine, and the oil cooler's capacity is 25%
greater than in C7 for more dependable
operation during extreme (track or desert
driving) conditions.
More aggressive valve timing and 11.5:1
compression along with new intake and
exhaust manifolds raise output to an SAErated 490-495 hp (365-369-kW) at 6450
rpm (with and without the optional lowrestriction exhaust system). Peak torque
is rated at 465-470 lb-ft (630-637 Nm)

26 September 2019

Photo credit: Steve Fecht/GM

The 2020 Corvette Stingray is the realization of Zora Arkus-Duntov's mid-engine vision. Air intakes on
each flank are integral to the car's thermal management.
at 5150 rpm. The LT2 is redlined at 6500
rpm. Cylinder deactivation remains to
help enhance fuel economy.
Asked what kept GM from clearing
the worthy 500-horsepower (373kW) hurdle for the 6.2-L LT2, Jordan
Lee, the global chief engineer for
small-block engines, acknowledged,
"Honesty stopped us at the level we
were confident could be provided in all
of the engines we'll build for the new
Corvette. As the only naturally aspirated
V8 in the segment, this engine will
deliver the visceral experience expected
of a Corvette," he told Automotive
Engineering during the car's unveiling in
Tustin, California.
Tremec will supply a U.S.-made
8-speed dual-clutch automated-manual
transmission with paddle shift control.
Along with the absence of a clutch pedal,
a conventional shift lever is also a thing of
the Corvette's past. Instead, two consolemounted pull toggles select Drive or
Reverse while three buttons choose either
Park, Neutral, or the Low/Manual modes.
Executive chief engineer Tadge Juechter
added, "Regardless of driving mode,
our performance shift algorithms are so
driver-focused they can sense spirited
driving and hold lower gears longer for
optimum throttle response."
Explaining the loss of the manual
transmission selected by 20% of C7
buyers, Juechter noted, "With no
interruption of torque delivery during
upshifts, the DCT is the superior

performance solution. Squeezing a
clutch pedal into the foot box and shift
linkage down the structural center
tunnel would have posed design
compromises we weren't prepared to
make. And we know our customers will
be thrilled with the sub-3-second 0-to60 acceleration we've achieved with the
Z51 [equipment] option."
To exploit the benefits of a midengine car's enhanced traction at the
rear wheels, first gear provides more
torque multiplication, while seventh
and eighth are tall overdrive ratios for
quiet and efficient highway cruising.
The middle five gear ratios are closely
spaced for optimum acceleration and
track performance. As in a racecar, the
transaxle's input shaft is positioned
below (versus above) halfshaft height to
facilitate mounting of the engine lower in
the car. Electronic traction management
and limited-slip differential controls are
both available.
In addition to previous Weather, Tour,
Sport, and Track driving modes, two
additional choices have been added to
C8. MyMode is a configurable setting,
and "Z mode" goes beyond MyMode to
permit tuning of up to twelve engine,
transmission, steering, and damper
performance variables.
(A longer version of this article is
available at sae.org/news/2019/07/2020chevrolet-corvette-intro.)

By Don Sherman, contributor,
Automotive Engineering magazine

MOMENTUM


http://www.sae.org/news/2019/07/2020-chevrolet-corvette-intro http://www.sae.org/news/2019/07/2020-chevrolet-corvette-intro

Momentum - September 2019

Table of Contents for the Digital Edition of Momentum - September 2019

Momentum - September 2019
Contents
Editorial
Briefs
Student Generation
Air Mission
Baja Believers
Passing Tech Inspection Proves Difficult for Teams at Sae Clean Snowmobile Challenge
Competition Comes to Mcity
Penn State Behrend Repeats as Champ at 40th Anniversary of Sae Supermileage
Victory for Victoria at Formula Hybrid
Engineering the 2020 Chevrolet Corvette
F-16 Anti-Collision Software Now Used in the F-35
Sae 101: Innovations in Mobility Conference
Miscellaneous News for Sae Student Members!
DOSSIER: Samuel Brennan of Millersville University
Navigating the Hiring Process in Industry
Momentum - September 2019 - Momentum - September 2019
Momentum - September 2019 - Cover2
Momentum - September 2019 - Contents
Momentum - September 2019 - Editorial
Momentum - September 2019 - Briefs
Momentum - September 2019 - Student Generation
Momentum - September 2019 - 5
Momentum - September 2019 - 6
Momentum - September 2019 - 7
Momentum - September 2019 - Air Mission
Momentum - September 2019 - 9
Momentum - September 2019 - 10
Momentum - September 2019 - 11
Momentum - September 2019 - Baja Believers
Momentum - September 2019 - 13
Momentum - September 2019 - 14
Momentum - September 2019 - 15
Momentum - September 2019 - Passing Tech Inspection Proves Difficult for Teams at Sae Clean Snowmobile Challenge
Momentum - September 2019 - 17
Momentum - September 2019 - Competition Comes to Mcity
Momentum - September 2019 - 19
Momentum - September 2019 - 20
Momentum - September 2019 - 21
Momentum - September 2019 - Penn State Behrend Repeats as Champ at 40th Anniversary of Sae Supermileage
Momentum - September 2019 - 23
Momentum - September 2019 - Victory for Victoria at Formula Hybrid
Momentum - September 2019 - 25
Momentum - September 2019 - Engineering the 2020 Chevrolet Corvette
Momentum - September 2019 - F-16 Anti-Collision Software Now Used in the F-35
Momentum - September 2019 - Sae 101: Innovations in Mobility Conference
Momentum - September 2019 - Miscellaneous News for Sae Student Members!
Momentum - September 2019 - DOSSIER: Samuel Brennan of Millersville University
Momentum - September 2019 - 31
Momentum - September 2019 - Navigating the Hiring Process in Industry
Momentum - September 2019 - Cover3
Momentum - September 2019 - Cover4
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