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AVANTIBY STUDEBAKER, A STEP FORWARD was an article
that was published in the June 1963 issue of Hot Rod Magazine.
According to the chef at our local pizza parlor, avanti is
an Italian word meaning forward. Not the ardent, immodest
type of forward, but forward like advanced, radical, onward.
At least we're sure that the last three descriptive words
are what Studebaker had in mind
when they picked the name Avanti for their four-passenger
sports coupe.
Studebaker's Avanti has been
before the public eye for a full year but it is really just
now getting a fair share of exposure to car buyers. Soon after
introduction in the spring of 1962, problems popped up in
body manufacture which seriously curtailed production. Avanti's
body is made of fiberglass and
manufactured for Studebaker by
the Molded Fiber Glass Company of
Ashtabula, Ohio. MFG also makes body parts for the Corvette
and about the time Studebaker
was getting ready to build Avantis in quantity, Chevrolet
was making the switch to an all-new Sting Ray model which
required extensive retooling and mold changes at MFG. To take
care of the established customer, Chevrolet, Avanti production
was limited and not too many of them ever did get into dealers'
hands during the 1962 calendar year. Studebaker
took advantage of the slowdown to improve the quality of their
molds, interior trim fit and other components of the Avanti
so didn't exactly stand still during the slack period. Those
of you who have inspected an Avanti body closely have probably
noticed the finish is excellent; better than anything being
produced in steel in this country and far better than the
Sting Ray, which somehow inherited a bundle of wrinkles during
the model changeover.
Studebaker selected fiberglass
instead of steel for their Avanti for a number of reasons.
The Avanti was s "hurry up" car, one that was pushed into
production to prop up a sagging Studebaker
image, and the fastest, most economical way to get the car
into production was with molded fiberglass. Some of the design
characteristics of the Avanti would have presented problems
if produced in steel but with fiberglass,
molding of unusual contours was simplified. The first production
Avanti body was delivered in just over ten months from the
time management decided to use fiberglass
and tooling costs were less than one million dollars. In steel,
the same results would have required 15 months and an estimated
$17 to $20 million. A complete Avanti body, as delvered from
MFG, is made up of 100 molded parts and 36 pieces punched
or sheared from fiberglass sheet. MFG assembles, finishes
and paints Avanti bodies for Studebaker
and also ships parts which Studebaker
assembles into bodies in their own plant. Although many people
shied away from fiberglass bodies in the past due mostly to
the fact that few body shop mechanics knew how to repair collision
damage, their are many favorable properties in fiberglass
bodies. The many thousands of Corvettes sold during the past
ten years have caused most body shop mechanics to learn the
art of fiberglass repair so Avanti
does not have the stigma to overcome that plagued the early
Corvette. Fiberglass bodies are
completely corrosion resistant so the "metal termites" that
prey on cars driven on salted streets in the eastern part
of our country during the winter cannot feed on the Avanti.
Salt air from coastal areas is no problem either. Glass bodies
are lightweight and the reduced weight above the car's frame
rails results in a lower center of gravity which promotes
better handling characteristics. Body glass thickness for
the Avanti varies according to requirements but the average
panel is .100-inch thick. The completed body weighs 510 pounds,
355 of which is fiberglass parts
and bonding materials. The other 155 pounds are steel parts
which are molded and/or riveted into the body to give reinforcing
or tapping plates for parts attachments. Fiberglass
has excellent acoustical properties so will dampen road noise.
At the same time, it is a poor resonator so panel drumming
is lessened. It will not bend permanently. It will flex and
return to its original shape even after substantial abuse
so many body and fender bumps sustained by the average steel
car would appear only as scratched paint on a fiberglass
body. An extreme blow will of course fracture fiberglass
and require repair. Fiberglass
cannot be bent or scratched like sheet metal so fits between
doors, hoods, trunk lids and their openings must be much more
accurate than with a metal body. It is impossible to jack
or hammer a glass body and door to change fit. They must fit
right from the mold. A whole story could be written on the
Avanti's fiberglass body but
the best way to understand the precision used in their manufacture
is to inspect one closely. Note that there are no chrome strips
used on the body. None are needed since the entire body, minus
hood, doors, trunk lid and gass filler door, is finished into
one piece. All body joints are filled and smoothed so that
chrome is not needed to cover joints.
Progressing to the interior of
the Avanti, it is distinctive with styling resembling an airplane
cockpit. Instruments are grouped directly in front of the
driver and except for the windshield wiper control and ignition
lock, all switches are in a small panel grouping centered
above the windshield. Easy-to-read instruments tell the driver
what's going on under the hood and how fast he's covering
ground. An electric tachometer is standard equipment and has
a wide-sweep dial to 6000 rpm. The speedometer is calibrated
to 160 mph. Three smaller intruments mount to either side
of the tach and speedometer; clock, water temperature and
ammeter to the left; gasoline, oil pressure and vacuum-pressure
gage to the right. The instrument panel is recessed well into
the padded dash so that no instrument light glare reaches
the windshield in night driving. A console unit fits between
the bucket seats up front and contains aircraft-style levers
for air vent, temperature and heater controls at the forward
end. Next in line is the shift lever, either automatic or
manual, then ash tray with lighter, and last, a secondary
glove box of fairly small dimensions. The console does not
extend into the rear seat area although there is a medium
sized drive-shaft tunnel in that area.
Seating in the Avanti's front seats is comfortable despite
the fact that they are rather close to the floor as dictated
by the low body lines. They are really the nearest thing to
a true bucket seat being built by an American manufacturer.
The seat shell, both back and bottom, is fiberglass with only
the hinges and seat track attaching plates metal. The vinyl
upholstery is shaped to wrap
around the occupants back side snugly and even though we are
personally of rather generous proportions, we found seating
comfortable. The seat bottom is divided so that the center
part of the cushion sinks to absorb body weight, while the
rolled side sections do not deflect but stay firm to restrict
a person from sliding on tight corners. The back seat is a
compromise between buckets and bench type and although not
as comfortable as the front seats and more restricted on head
and leg room, the rear seats will hold a pair of large adults
without complaints from them. Entry into the rear seat is
eased somewhat by the fact that the front seats fold far forward
and the doors are very wide, opening partially into the rear
compartment. A comforting feature for Avanti passengers is
the built-in roll bar which passes across the top between
front and rear seats. This stamped steel section acts also
as the post between door and rear side windows, and ties into
a reinforced section in the rocker panel. It is a sturdy member
and although it extends below the top shell, it is well padded
for the safety of entering or exiting rear set passengers.
Although interior appointments, like styling, are a matter
of a person's individual tastes, we found little to criticize
in the Avanti. One exception was the ridiculously small rear
view mirror. One about four times the size would be just right.
Front seat ventilation could be better too although we did
eventually work out a fairly good way to cool the Avanti on
warm days. By opening the two swing-out rear side windows
to their limit, then opening all cowl vents, including defroster
(hot water valve off), and leaving door glass and vent windows
closed, we could create circulation through the cowl air intakes
and out the back windows. It is no substitute for air conditioning
but it is better than being buffeted by wind through the door
glass on a hot day.
Although the Avanti is not a small car, it isn't particularly
big either. The car which it most closely approximates (except
for length) is the Falcon. The Avanti uses a 109-inch wheelbase
(1/2 inch less than Falcon), is about 70 inches wide (same),
54 inches high (same) and 192 1/2 inches long (almost a foot
more than Falcon). Avanti tread is 57 1/2 front and 56 1/2
rear. The Avanti uses a modified Lark convertible frame and
standard Studebaker suspension
components. The X-member convertible frame has 160% more rigidity
than the ladder-type Lark frame and when compared to a standard
Lark hardtop with steel body, the Avanti body and frame give
a 49% increase in total unit rigidity. Even with the heavier
X-member frame, weight savings with the fiberglass body make
the Avanti body-frame combination 166 pounds lighter than
a Lark hardtop body-frame. Also, the Avanti center of gravity
is far lower than the Lark's.
Although the Avant's suspension components are basically
standard Studebaker, modifications
and extras have been instituted here too. Front suspension
is by unequal length A-arms with coil springs. A stabilizer
bar clamps to the lower A-arm on each side with the center
portion of the bar suspended from the forward frame extensions
by links. Adjustable Gabriel tubular shocks are used inside
the coil springs. Studebaker
is one of the few American built cars we can think of which
does not use ball-joints on their front suspension. Instead,
the spindle support acts as a king-pin, passing through spindle
bushings and fastening to a forged steel extension on the
lower control arm. The whole set-up looks quite sturdy and
should give excellent service before requiring new bushings.
Suspension at the rear is by conventional semi-elliptic 5-leaf
springs and a Spicer type rear axle. Additional features for
the Avanti are radius rods that fit between brackets on the
axle housing and frame on each side of the car. These rods
fit above the axle so do not restrict ground clearance. Their
purpose is to prevent "dive" on hard braking and "squat" on
acceleration that often accompanies a light-duty leaf spring.
Another Avanti extra is a stabilizer bar with ends attached
to bushings on the spring clip plates and the center part
linked to frame brackets behind the rear axle. As at the front,
adjustable Gabriel tube shocks are used. Ride is firm by most
standards and a stiffer heavy-duty suspension is an available
option.
Steering for the Avanti is standard Studebaker
with a drag link extending forward from the pitman arm to
a bell-crank idler bracketed to the crossmember under the
front of the engine. A pair of tie-rod links extend from this
central steering pivot to outer steering arms at the spindle.
The standard steering gear has an overall ratio of 24.5:1
with 5 turns of the steering wheel required lock-to-lock.
An optional link-type power steering unit has an overall ratio
of 18:1, 3 1/2 turns lock-to-lock.
As with many other features on the Avanti, something a little
extra has been added in the brake department. Instead of the
usual drum brakes both front and rear, Bendix disc
brakes are fitted to front wheels, special heavy-duty
cast iron drums to the rear wheels. These disc units were
engineered by Dunlop of England with Bendix licensed to make
them here. Each unit consists of a cast iron caliper with
housings which bolt to either side and contain 2 1/8-inch
hydraulic cylinders to force 2-inch square pucks against either
side of an 11 1/2-inch cast iron disc. The caliper is fastened
to the spindle forging and a sheet metal dust cover fits over
the inner side of the disc. These disc
brakes have several distinct advantages over drum brakes
and although there's been a lot of talk about them in this
country for years, the main reason why they haven't reached
a production status before is mostly a matter of high cost.
Disc brakes are unaffected by
water, mud or other foreign matter and have excellent fade
resistant qualities since only a small portion of the disc
is actually clamped between the lining segments at any one
time while the rest of the disc is exposed to cooling air.
Brake "pull" against steering is non-existent with discs making
straight-line stops every time. Disadvantages, other than
cost, for the most part concern high line pressure to operate
the wheel cylinders since linings are not self-energizing.
Power assist takes care of this. Also, parking brake attachments
on disc brakes are complicated but Studebaker
solved this quite simply by using their drum brakes with parking
brake linkage on the rear. The combination of disc front and
drum rear works very well since the discs are designed to
take 62% of the breaking load. The heavy-duty cast iron drums
on the rear have wide flanges which extend into the air stream
to dissipate heat and prevent "bellmouth" drums under high
heat. They are 11 inches in diameter with 2-inch lining. To
compliment the highly effective braking system on the Avanti,
15-inch wheels are standard so that air flow over brake components
is substantial to air cooling. Power brakes are standard on
the Avanti. During all the test driving we did with the Avanti,
and it was considerable, we never experienced any brake fade
or erratic behavior. Even after high speed runs at both 1/4-
and 1/2-mile drag meets, we could stop as quickly as we wanted.
Even with power assist, they are not "touchy." If you really
use them hard, stops can be made in an unbelievably short
distance without wheel slide. Avanti brakes rate A-plus by
standards in this country.
There are three engines available in the Avanti and they
are designated R1, R2 and R3. Studebaker
does not advertise power ratings of the Avanti engines, they
just say that the engine has all the power a driver can use.
Well, they may think so but a performance-minded buyer still
likes to have a horsepower figure to mull over when he chooses
a car. And, the Avanti is supposed to appeal to performance
enthusiasts so since Stude won't put a power tag on the three
engines, we'll make our own guesses. The R1 and R2 engines
are both 289 cubic inches displacement and the R1 is the standard
powerplant for Avantis. It has 10.25:1 compression, a 260
mechanical lifter camshaft and single four-barrel carburetion.
We will guess its output at 240 hp. The R2, although the same
displacement and fitted with the same camshaft as the R1,
has less compression, 9:1, has a four-barrel carburetor and
gets an assist from a belt-driven Paxton centrifugal supercharger.
This supercharger produces
a maximum of 5 pounds boost in the intake manifold at 5200
rpm. We'll guess its horsepower at about 285 with full boost
pressure. The optional R2 engine lists for $210 extra. The
top engine option is called the R3. In its early development
form, this R3 engine had 299 inches displacement but as released
to the public, it will have 3/32-inch larger bore than the
289's for a 3 21/32 which with the 3 5/8-inch 289 stroke,
gives 304.5 cubic inches. It has a camshaft with more duration,
9.5:1 compression, improved heads, a four-barrel carburetor
and a Paxton supercharger with
6 pounds manifold boost at 5200 rpm. The R3 we'll give a rating
of about 305 horsepower but there's more here than meets the
eye. R3 engines are built by Paxton Products in Santa Monica
and they are hand built to rigid specifications. Cylinder
blocks as received from Studebaker in South Bend, are standard
289 items. First, Paxton bores them to the 304-inch bore size,
then the top of each cylinder bore is machined to give a pair
of notches for valve clearance and to match the chamber shape
in the heads. Last, block height from the main bearing bores
is carefully checked and the block surfaced on each bank to
ensure exact alignment and clearance between piston and deck.
Standard forged steel crankshafts are used but heavy-duty
aluminum bearing inserts are used for both mains and rods.
The pistons are made by Forged-true and have a flat top with
no valve reliefs or pop-up section. Cylinder heads for the
R3 are special castings and have larger-than-standard port
areas. Valves are 1/8-inch larger than those used on the R1
and R2 heads. Intakes are 1 3/4-inch and exhausts are 1 5/8-inch.
Also, the valves are undercut and polished. Chambers for R3
cylinder heads are first machined to give uniform shape and
volume, then hand polished to eliminate all sharp edges. With
uniform chamber volume and deck clearances, all R3 engines
will be quite close to their designed 9.5:1 ratio. The camshaft
used in the R3 is more radical than that used in the other
R-engines but it is by no means "wild" when compared to the
ones used by most of the high performance engines on the market.
It has 272 duration while most of the big 400-plus-inchers
have around 300 duration. A large-runner aluminum intake manifold
tops the R3 with a single four-barrel carburetor enclosed
in a cast aluminum pressure box. Different blower pulley ratios
are used on the R3 and it is supposed to deliver 6 pounds
boost at 5200 rpm. Now although we've estimated a horsepower
figure of 305 for the R3 engine, we've based that guess on
6 pounds boost at 5200 rpm. The pressure build-up is pretty
rapid in a centrifugal supercharger at high rpm's and we wouldn't
be a bit surprised if an accurate gage would show about 8
pounds at 6000 and maybe even 11 or 12 pounds at 6500 rpm.
Guessing horsepower gets a little ridiculous but we drove
an R3 Avanti in some timed drag events and registered speeds
that would only be possible if the engine produced at least
325 horsepower, maybe much more.
All told, we spent time behind the wheels of three Avantis
while gathering information for this report. Our first car
was a production R2 with optional four-speed transmission.
Next was a Studebaker Engineering
prototype R3 with automatic transmission. The last car, and
the one which we put the most mileage on (over 1000 miles)
was a late production R2 with automatic. We picked it up brand
new before it had even had new car detailing and when we returned
it, the only notation we had made for the dealer was that
there was a slight exhaust leak somewhere.
The first R2 with four-speed and standard 3.73 rear axle
ratio turned an even 90 mph in the 1/4-mile and had a 16-second
elapsed time. Not too outstanding but then not too bad considering
gearing and a small engine with limited blower pressure. The
next Avanti was the R3 version, hottest thing made by Studebaker,
and it was a surpriser. Out first outing with the R3 was at
a drag meet using the back stretch of the Riverside International
Raceway. The sponsoring Southern California Timing Association
conducts occasional 1/2-mile drags on this long stretch. We
had the prototype 299-inch R3 for this meet and a 4.09 rear
axle ratio. Regular 6.70 x 15 street tires were fitted. The
transmission was Studebaker's
automatic made by Borg-Warner with ratios of 2.40, 1.47 and
1:1. On our first run, we found that the Avanti would not
take off from the line in sensational fashion due to the relatively
small displacement and the fact that blower boost does not
really come on strong until the engine reaches about 3000
rpm. No matter how we tried driving the car, starts were slow.
But, once the engine got above 3000 rpm, it started to move
and felt very strong. We made the 1-2 shift at 6200 but engine
acceleration was so rapid that the tach touched 7000 just
as the automatic shifted. Again, the 2-3 shift was made at
6200 and this time the action was quicker with the tach reaching
about 6500. At the end of the half-mile, the tach showed 6700.
We made several runs during the day, changed to larger street
tires, changed plugs and tried several driving styles. The
best results were 128.94 mph and 21.30 seconds elapsed time.
SCTA uses only speed for their half-mile records and we discovered
that the Avanti had raised the class record by almost 6 mph.
As a comparative figure, the hottest Super Stocker time recorded
in the half was 136 mph by a 426 Plymouth.
The following weekend, we took the same car to Pomona for
a try at the quarter-mile. A 4.89 rear axle ratio had been
installed for the shorter track. The first run netted a speed
of 107.78 mph and an elapsed time of 13.71. The next run was
almost identical. The engine was well over its peak at the
end of the quarter and the tach showed 7000 through the lights
so we decoded to put on some larger tires we had brought along.
After we arrived back at the pits, we discovered that the
alternator belt had flipped off on the run just completed
and passed between the dual blower belts and their idler,
breaking a bracket on the idler tensioner. So, we were out
of racing business for the day. Had we been able to run the
larger tires, we are confident that speed would have been
close to 110 mph and we should have been able to work the
elapsed time down in the low 13's. All of the runs, both 1/2-mile
and 1/4-mile, were made with stock exhaust system (loud though)
and air cleaner. Even with the belts off and blower inoperative,
the Avanti can be driven. We drove about 100 miles before
we got back to Paxton Products for repairs.
The last test car we used was the new R2 and we made no attempt
to try it at the drags. We just drove it and enjoyed it. A
few short bursts through the gears in remote locations proved
that it had adequate power, as Studebaker
claims. Even with the blower, the engine is very smooth, quiet
and docile as a limousine in heavy traffic. Amazingly enough,
we used the R3 version in our travels to and from the office
and except for the objectionable gear ratio we had fitted
for the drags, it too was a very smooth car for daily duties.
Admittedly, we used the new R2 pretty well whenever opportunity
permitted after we got the first few hundred miles on the
engine, but even with our heavy foot, we never got worse than
12 miles per gallon. We wouldn't hesitate to bet that a careful
driver could get 16 mpg at a steady highway pace with an R2
Avanti.
Andy Granatelli, President of
Studebaker's Paxton Division, prepared several cars to make
USAC-sanctioned record attempts at Bonneville late last winter
and although most of the trials were frozen out by bad weather,
he did manage to make some official two-way averages with
a Lark, a Hawk and an Avanti, all equipped with R2 engines
and four-speed transmissions. The cars were completely stock
including exhausts. Naturally, they were tuned to the highest
degree. The Lark averaged 132.04 mph. The Hawk, with its sleeker
body lines, averaged 140.24 mph. The Avanti, a real slippery
customer in the aerodynamics department, averaged 158.14 mph
through the flying mile. With everything else equal, it proves
how important body shape can be. Even on the highway, the
smooth lines of the Avanti show up in reduced wind noise at
high speeds. It is a very quiet car.
Speaking of driving the Avanti on the highway, the more twisting
the highway becomes, the more fun this car is to drive. Our
R2 with automatic weighed 3590 pounds full of fuel but minus
passengers. 56% of this weight rests on the front wheels but
every passenger you add improves the balance between front
and rear. 62% of front seat passenger weight goes on the rear
wheels, only 38% to the front. Rear seat passengers donate
80% of their body weight to the rear wheels. Even with just
the driver, Avanti handling is great. It might take some getting
used to a car with heavy under steer because this car is just
the opposite; it has a lot of over steer and the tail end
of the Avanti swings out quickly when taken through sharp
corners fast. Just pour the power on and you can direct the
car anyplace you want to go in the corner. The over steer
gives the front end a light, easily controllable feel and
the throttle takes care of the rear.
On the opening pages of this story, you'll see a series of
pictures where we played around with the Avanti on a sharp
uphill corner on a narrow mountain road. We drove the car
into the corner very fast and then purposely "tossed" the
rear wheels off onto the graded dirt shoulder to test control.
By using plenty of power and correcting into the slide, we
easily maintained control and pulled back onto the pavement
and on up the road. We can't think of any other sedan we'd
care to try this trick with. The Avanti has a handling style
all its own but with just a little practice, driving one on
twisting roads can be thrilling. Summing up our experiences
with the Avanti, we must admit that we were won over. We didn't
think we'd be too impressed but body quality, the power of
the R3 engine, handling and other . . .
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