CARCARETOOL VEHICLE GUIDE

Alvis Speed 20 Sc

Alvis Speed 20 Sc — convertible, Straight-6. Explore engine specifications, fuel economy, dimensions, tire sizes, seating, maintenance and tire-pressure guidance.

EngineStraight-6

Transmission4-speed manual transmission

DrivetrainFront-engine, rear-wheel-drive

About the Alvis Speed 20 Sc

Alvis Speed 20 Sc is a convertible in the convertible class. The guide brings together the vehicle information currently available for this model. Public source material describes the model in the context of its design, market positioning and vehicle history.

This guide is designed to answer practical questions about the Alvis Speed 20 Sc, including its specifications, engine, fuel economy, tires, maintenance and ownership details.

Alvis Speed 20 Sc specifications at a glance

Use this table for the model-level essentials. Exact figures may vary by year, trim, engine and market.

Make	Alvis
Model	Speed 20 Sc
Model years	Not specified
Body style	convertible
Vehicle class	convertible
Manufacturer	Alvis
Market / country	NL, NZ

Engine, transmission and performance

The available source data does not identify a single engine configuration for every Alvis Speed 20 Sc variant.. Published power figures include SB 95 bhp @ 4,000 rpm; 3½-litre 102 bhp @ 3,600 rpm; SA to SD 19.82 tax horsepower; 3½-litre 25.63 tax horsepower.

Fuel type	petrol
Power	SB 95 bhp @ 4,000 rpm; 3½-litre 102 bhp @ 3,600 rpm; SA to SD 19.82 tax horsepower; 3½-litre 25.63 tax horsepower

Alvis Speed 20 Sc performance and economy

Power	SB 95 bhp @ 4,000 rpm; 3½-litre 102 bhp @ 3,600 rpm; SA to SD 19.82 tax horsepower; 3½-litre 25.63 tax horsepower

Alvis Speed 20 Sc other specifications

Name	Speed Twenty and 3½-litre
Image	Alvis Speed 20 SC Lancefield Drophead Coupe (8514289680).jpg
Caption	1935 Speed Twenty SC
Configuration	straight-six
Displacement	SA & SB 2511 cc; SC & SD 2762 cc; 3½-litre 3571 cc
Bore	SA to SD 73 mm (2.9 in); 3½-litre 83 mm (3.3 in)
Stroke	SA & SB 100 mm (3.9 in); SC & SD 110 mm (4.3 in)
Block	4-bearing balanced crankshaft with torsional vibration damper
Head	alloy pistons
Valvetrain	pushrod overhead valves camshaft drive by duplex chain patented multiple valve springs
Fuelsystem	3 SU carburettors supplied by double petrolift hotspot and dual ignition
Fueltype	petrol
Oilsystem	forced lubrication to main and big end bearings, rockers and pushrods
Coolingsystem	water, thermostatic radiator shutters, centrifugal pump

TIRE PRESSURE

Recommended tire pressure for Alvis Speed 20 Sc

Check the vehicle placard or owner’s manual for the manufacturer’s cold inflation pressure. CarCareTool estimates are clearly labelled when an exact verified value is unavailable.

Normal load34 PSI front32 PSI rear

Fully loaded36 PSI front35 PSI rear

Load condition	Front	Rear	Status
Normal	34 PSI	32 PSI	Estimate
Fully loaded	36 PSI	35 PSI	Estimate

Calculate how much air to add

Frequently asked questions about Alvis Speed 20 Sc

These FAQs are generated automatically for this specific vehicle from the specifications, features and ownership data available in CarCareTool. Questions are selected by relevance so the page focuses on details that can actually be answered for this model.

What tire pressure should I use for the Alvis Speed 20 Sc?

For the correct setting, use the cold inflation pressure on the vehicle placard or in the owner’s manual. When CarCareTool does not have a verified configuration-specific value, its starting estimate is 34 PSI front and 32 PSI rear for normal load. This is an estimate, not an OEM recommendation.

What is the best engine oil for the Alvis Speed 20 Sc?

There is no single best engine oil for every Alvis Speed 20 Sc configuration. Use the viscosity grade and manufacturer approval specified for the exact engine in the owner’s manual.

What body style is the Alvis Speed 20 Sc?

The Alvis Speed 20 Sc is classified as a convertible.

What fuel does the Alvis Speed 20 Sc use?

The available source data lists the Alvis Speed 20 Sc fuel type as petrol.

How much horsepower does the Alvis Speed 20 Sc have?

The published figure for the Alvis Speed 20 Sc is SB 95 bhp @ 4,000 rpm; 3½-litre 102 bhp @ 3,600 rpm; SA to SD 19.82 tax horsepower; 3½-litre 25.63 tax horsepower. Output can vary by engine and specification.

Who makes the Alvis Speed 20 Sc?

The manufacturer listed for the Alvis Speed 20 Sc is Alvis.

What class of car is the Alvis Speed 20 Sc?

The Alvis Speed 20 Sc is listed in the convertible class.

Which markets or countries sold the Alvis Speed 20 Sc?

The CarCareTool catalog currently associates the Alvis Speed 20 Sc with NL, NZ. Market availability and specifications can differ.

What replaced the Alvis Speed 20 Sc?

The available vehicle data lists a later model or generation as the successor where applicable.

How often should I check the tire pressure on the Alvis Speed 20 Sc?

Check the tires regularly and before long trips, with the tires cold. Use the vehicle placard or owner’s manual as the source of the manufacturer’s recommended pressure.

Should I use the tire sidewall pressure for the Alvis Speed 20 Sc?

No. The maximum pressure printed on the tire sidewall is not automatically the vehicle’s recommended setting. Use the vehicle placard or owner’s manual for the correct cold inflation pressure.

Does the recommended tire pressure change when the Alvis Speed 20 Sc is fully loaded?

It can. Many vehicles specify a different cold pressure for heavier loads. Check the vehicle placard or owner’s manual for the exact loading condition.

Can the Alvis Speed 20 Sc have different tire pressures front and rear?

Yes. Some vehicles specify different front and rear pressures because axle loads and vehicle configurations differ. Follow the exact vehicle recommendation where available.

Why can mileage differ from the published figure for the Alvis Speed 20 Sc?

Published fuel economy is measured under a defined test method. Real-world mileage can vary with traffic, speed, temperature, tire pressure, payload, maintenance and driving style.

Data sources and verification are available in the page editor; exact specifications can vary by year, market, trim and engine.

Alvis Speed 20 Sc images

Vehicle images are shown from the stored source image records when available.