This is a 'Ferrari' dictionary that I have added to over the years.
You can also download the Excel Spreadsheet that is the source.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Italian English
       Plural of Nouns change: 'o' to 'I', or 'a' to 'e'
except some, like 'luce' are singlular and become like 'luci' in the plural
Diminutive Formation:   ino, etto  Last letter can change for masc., fem., plural.
The dictionary lists automobile translations; ordinary usage is in (parenthesis).
A
accensione ignition
acciaio steel
acqua water
ammortizzatori shock absorbers
albero shaft
albero a camme camshaft
albero motore crankshaft
alessaggio bore
allessaggio e corsa bore and stroke
alimentazione fuel supply system (feeding)
ammisione intake (admission)
anello ring
anteriore front
apparecchio  apparatus
appoggio support
arangio orange
argento silver
aria air
arresto stop
arrivo arrival
aspirazione intake (aspiration)
asse axel
asse a camme camshaft
asta pole
avviamento starter
avviatore starter
azzurro blue
B
balestra leaf spring (cross-bow)
banco seat (bench)
barra bar, rod
basamento crankcase, engine block (footing)
batteria battery
benzina gasoline
bianco white
biella connecting rod
bilanciere rocker arm (balance arm)
bilancio balance
blu blue
bobina coil
bocchetta small orifice
bronzo bronze
bruno brown
buccola socket, bushing
bullone bolt
bussola compass, inner door
buttuta beat
C
calotta cap (skull-cap)
camera room
camera di scoppio combustion chamber
camma cam
candela spark plug (candle)
canna cylinder liner (barrel)
cappello little cap
cappuccio hood, boot
carbone carbon (coal)
cartuccia cartridge
carburante fuel
catena chain
cavo cable
centraggio centering
centrale center
cerniera hinge
chiaro clearness, light
chiava key
chiavetta (little) key
chiodo rivet
chiusura closing
cilindro cylinder
cinghia belt
codolo handle
cofano hood
collegamento junction, collector
collettore drain (collector)
comando control, drive, driving, gear
complessivo total, inclusive
completo complete
con with, by
concia tan [leather]
condensatore condenser, capacitor
condotto duct, conduit
conduttore conductor
cono cone
contachilometri speedometer (count km's.)
contagiri tachometer (count turns)
controdado lock nut
coperchietto (little) plate
coperchio plate, cover
copiglia cotter pin
coppa cup
coprimorsetto covering (boot)
coronato [dado] castle [nut] (crown)
corpo body
corrente current
corsa piston-stroke (run, race)
corto short (curt)
cuneo wedge
cuscinetto bearing (small cushion)
D
dado nut
deflettore deflector
descrizione description
destra right
diaframme diaphragm
disco disk
dispositivo apparatus
distanziala spacer
distributore distributor
distributrice distributor
distribuzione valve gear
doppia double
E
elastica elastic
electron (?) magnesium
elemento element
esterna outside
expansione expansion
F
fanale light, headlight
fanalino (little) light
fascetta clamp (corset)
fermo firm
filtranti filtered
filtro filter
fissaggio fixing
flangia flange
flessible flexible
forcellino forked
fra between
freno brake
frizione clutch (friction)
G
gancio hook, catch
generatore generator, alternator
ghisa cast iron
giallo yellow
giri revolutions
giunta coupling
gomma rubber
grano pin
gregio gray
gruppo group, cluster
guaina cable case 
guarnizione gasket
guida guide
guinti coupling
H,I
impianto installation
inferiore lower, inferior
ingranaggio gear
ingrassatore lubrication fitting
innesto coupling
intermedio intermediate
interna internal
interruttore switch
ispezione inspection
J,K,L
lega alloy
leggera lightweight
leva lever
liscia flat, smooth
luce light
lungo long
M
maggiorazione oversize
manicotto sleeve, coupling, pipe
marcia speed [gear] (march)
marmitta pot
marrone brown
massima maximum
meccanica mechanical
medio middle
mensola bracket
molla spring
molletta little spring
motore motor
motorino little motor
morsetto small vise
mostrina flap, damper
mozzo hub
N
nero black
nocciola hazel color
normale normal
O
olio oil
ossatora framework, skeleton
P
paracolpo rubber bumper
paratia partition, baffle
paraurta bumper
paravento windshield
particolari particular
passo carreggiata wheelbase
pedale pedal
per for
perno pivot, hinge
peso weight
piano flat, smooth
piastra plate
piastrina little plate
pompa pump
ponte posteriore rear axle (bridge rear)
porta door
porporina purple
positivo positive
posteriore rear
potenza power
presa intake
prigioneiro stud
protezione protection, support
puleggia pulley
pulsante push button
puro pure, clear
Q,R
raccordo connector
rapporto ratio
radiatore radiator
raggi spokes
raschiaolio scraper
reggisportello support for small door
registro register
regolatore regulator
retro back
richiamo recall
ritegno restraint, support
rivestimento lining, covering, casing
rivetto rivet
rondella washer
rosa pink
rosso red
rota wheel
rotazione rotation
rullo roller
ruota wheel
ruttore points
S
sbrinatore  defroster
scarico exhaust
scatola box
scodellino sump, plate
scontrino check
scoppio explosion
scuro dark
seco dry
sede seat
semi half
semicolettore half drain
semplice simple
serbatoio tank
serratura lock
servofreno lock nut
sfere ball bearing (sphere)
sicurezza safety
silenziatore muffler (silencer)
sinistra left
smorzatore damper
sosegno support
sotto  under
spazzola brush 
speciale special
spessore thickness, depth
spia warning
spina pin (thorn)
spinotto small pin
spinterogeno distributor
sportello small door
staffa stirrup
stanuffo piston
sulle on the top
supporto support
T
tachimetro speedometer
tappo plug
targhetta name plate (little plate)
tassello plug
telaio chassis
tendicatena chain tensioner 
tenuta tight
tergicristallo windshield wiper
termistore temperature sensor
termostato thermostat
testa head
tirante connecting rod
torsione torsion, twisting
tranciata cut (as in lock washer)
triangolare triangular
tubo tube
U, V
valvola valve
vari various, different
vaschetta small basin, vase
ventola fan
verde green
vetro glass, lens
vetroresina  fiberglass
viola violet
vito screw
volano flywheel