Puzzled

[GlennAUII]

Thanks Trumpy.

[Macktheknife]

Technical Answer.

The T is "Supercharged" IE: Instead of the air being sucked into the Engine by the normal vacuum generated in the intake side, the air is compressed (By the turbo) and fed in at a positive pressure. This simply increases power because there is a greater air/fuel mixture. IE. more oxygen to burn.

The term Turbo, is a contraction of "Turbine Supercharged" a method of extracting extra power from internal combustion engines that has been around for a long time.

Many small to medium aircraft have been "Turbine Supercharged" for 50 or more years. Many versions of the Rolls Royce Merlin V12 engine (Spitfire etc) were "Turbine Supercharged"

Before becoming popular in Petrol powered engines, Diesel engines have been "Turbocharged" for yonks.

Simply put, the Turbo is a turbine type compressor (Impeller), which is driven by the exhaust gases, flowing through another tubine, all on a common shaft, encased in a single small snail shell shaped caseing.

Like Trumpy says, the howthingswork site will have diagrms etc that explain better than a bit of historical theory.

[ktford]

Geez Trev,

you swallowed an Enclopedia or what, maybe Foxtel is stuck on Discovery channel.

Scotty

[KEN 24T]

Mack! ... I'm impressed.

[GlennAUII]

thank mack! now I can't wait till dad gets home so I can see if I can spot that glowing!

[ktford]

Glenn I'm going to go out on a ledge here & publicy state that your dads turbo won't be glowing after he pulls into the drive after tootling home from work, spirited driving required cheif. get him to take you for a drive out Fishies way & pop the hood after a big blast, good luck!!

Scotty

[mickq]

  Macktheknife said:

Technical Answer.

The T is "Supercharged" IE: Instead of the air being sucked into the Engine by the normal vacuum generated in the intake side, the air is compressed (By the turbo) and fed in at a positive pressure. This simply increases power because there is a greater air/fuel mixture. IE. more oxygen to burn.

The term Turbo, is a contraction of "Turbine Supercharged" a method of extracting extra power from internal combustion engines that has been around for a long time.

Many small to medium aircraft have been "Turbine Supercharged" for 50 or more years. Many versions of the Rolls Royce Merlin V12 engine (Spitfire etc) were "Turbine Supercharged"

Before becoming popular in Petrol powered engines, Diesel engines have been "Turbocharged" for yonks.

Simply put, the Turbo is a turbine type compressor (Impeller), which is driven by the exhaust gases, flowing through another tubine, all on a common shaft, encased in a single small snail shell shaped caseing.

Like Trumpy says, the howthingswork site will have diagrms etc that explain better than a bit of historical theory.

In simple english, a turbo is an air pump. Its "fan blades" are spun up to high speed (100,000 rpm isnt unusual) by the exhuast your engine puts out (same stuff that comes out your exhuast pipe). This is why turbos dont get up and jiggy until your engine gets to a certain speed...it needs a certain amount of exhaust before they can spin really fast. When they spin really fast they blow lots of air into your engine. Just like a hairdryer.

They blow in much more air than normally would get sucked in by a non-turbo engine. The result (and the aim of turbocharging overall) is to get the same power from an engine that you would normally get from a much bigger engine. But without the extra size and weight of actually having a bigger engine. (ie the amount of air and fuel that is in a cylinder and explodes making power is the same as how much you would find in a much bigger engine that wasnt turbo'd....and the more air+fuel, the bigger the explosion and the more power you get)

To take it to extremes, with a big turbo in the old Formula 1 days (before turbos were banned), BMW got 1100hp from a standard BMW off-the-shelf production car engine block. And it was only a 1500cc engine!

So in the case of the XR6T, you have a small light 4 litre engine that puts out the same power as a rather well known heavy and bloated 5.7 litre Expensive Daewoo engine.

And that, my friend, is why new SS drivers are both often embarrased and scared to take on XR6T's: the idea of possibly getting whipped by a "small" 4 litre 6 cylinder engine is highly embarrassing to someone who lives by the motto "there is no substitute for cubic inches".

(There is....less cubic inches and a turbo....)

Macktheknife: Actually, the Spitfires were supercharged, not turbocharged.

They had a 2-stage supercharger. You can see one mounted on the top LHS (when viewed front on) of the engine at http://www.bcam.net/engines/merlin/merlin1.jpg

Planes have been turbocharged since 1918 (about 8 years after Turbos were first invented).

Very few WW1 planes had turbos. You could find the odd supercharger around. Many planes in WW2 had turbos. It was in 1936 when our friend Mr Garrett supplied turbos to B17's. In 1954 he set up a separate company devoted to turbos for planes. Later that company would be renamed as GarrettAutomotive.

Not long after that, he put one in my T.

Ive been smiling ever since.

[Mondie]

A turbo gives you the power of a larger displacement engine with the benefits of a smaller one. The XR6T runs 6 psi of boost over atmospheric (14.7psi) so effectivley you have a engine with a displacement of (14.7+6)/14.7 *4.0 = 5.6 lts. The beauty of the turbo is if you are cruising and not using or needing the power the engine has pretty much the same fuel consumption of a NA, but with the reserve power there when needed.

[plonky]

There is no substitute for cubic inches?

I would have to argue that....especially if the same technology is applied to a larger capacity engine

EG: A 2.6 litre Nissan six cylinder with twin turbos would not put out at as much power as a 4 litre Ford six cylinder engine with twin turbos if the SAME technology is applied to both cars

Reason being is that the larger capacity engine can be filled with a larger charge of air/fuel mix than a smaller capacity engine

The larger the charge, the bigger the explosion, the more power created

An 800 cid supercharged Chrysler Hemi will put out more HP than a 350 cid Supercharged Chevrolet engine - purely because the capacity mandates more air/fuel mix in each cylinders.

So...There IS NO substitute for cubic inches

[Antisocial]

(plonky @ Nov 27 2003, 08:21 AM)

  Quote

There is no substitute for cubic inches?

Like a red flag to a bull.....