What does 'Dual Ram' mean?

Luckydog · 31-10-2007, 12:05 PM

It's on the side of my Holden 2.6 engine.........

**DrB0b** · 31-10-2007, 12:07 PM

^Two sheep-power engine.

**Begbie** · 31-10-2007, 12:09 PM

You can get two sheep in the back seat.

**AntRobertson** · 31-10-2007, 12:18 PM

'Dual Ram' is something to do with air-flow. Probably a system to boost power.

watterinja · 31-10-2007, 12:25 PM

Probably running 2 carbs, with separate ram-air inlets feeding each one. Hence 'dual ram'...

**blackgang** · 31-10-2007, 12:28 PM

Originally Posted by Luckydog

It's on the side of my Holden 2.6 engine.........

OK first off, I am not sure what a HOLDEN is except that it is an Australian automobile to the best of my knowledge.

But it generally means , when connected to auto engines that it is a patent intake manifold where the fuel and air are mixed and fed into the cylinders which is supposed to give better economy and Horsepower.
Was first used on the Judge as RAM AIR back in the 60s and has since been used on others as cross ram ,ETC.
Supposed to bullshit you into thinking that it gives a supercharging effect.

IMHO.

**AntRobertson** · 31-10-2007, 12:30 PM

Originally Posted by blackgang

OK first off, I am not sure what a HOLDEN is except that it is an Australian automobile to the best of my knowledge.

It's a manufactuer. GM Holden to be precise, sells into the US now actually. Can't recall what they are re-badged as though.

**Thetyim** · 31-10-2007, 12:31 PM

Dual Ram is an airflow gimmick to increase torque at low rpm by means of a redirected air flow system engaged at 4,000 rpm..

**Thetyim** · 31-10-2007, 12:34 PM

Originally Posted by blackgang

Supposed to bullshit you into thinking that it gives a supercharging effect.

Are you thinking of "Ram Charging" ?
That is something different

**Marmite the Dog** · 31-10-2007, 12:46 PM

Originally Posted by Thetyim

Dual Ram is an airflow gimmick to increase torque at low rpm by means of a redirected air flow system engaged at 4,000 rpm..

Bullshit!

Originally Posted by DrB0b

Two sheep-power engine.

Spot on, B0b!

**Rigger** · 31-10-2007, 12:53 PM

Originally Posted by Thetyim

Dual Ram is an airflow gimmick to increase torque at low rpm by means of a redirected air flow system engaged at 4,000 rpm..

Many motorcycle use this ram air system and yes it can increase horse power at high speed. Even my 1998 suzuki has it and even the the lastest ZXR 1400 has it

watterinja · 31-10-2007, 01:02 PM

Ram-air intake - Wikipedia, the free encyclopedia

I don't agree entirely that the increase in static pressure provides much real boost.

In my experience with 4-cylinder hp. bikes, the inlet plenum effect & even distribution of inlet air (minimise turbulence spots), are really what's important - especially when feeding sensitive smooth-bore carburators.

**Marmite the Dog** · 31-10-2007, 02:08 PM

Do some cars still have carburettors?

**AntRobertson** · 31-10-2007, 02:13 PM

Originally Posted by Marmite the Dog

Do some cars still have carburettors?

Pretty good question actually. I can't think of any modern production cars that do off the top of my head but there's bound to be at least a few?

**Rigger** · 31-10-2007, 02:59 PM

Sport Rider-Ram Air Test of sport bikes on the motorcycle dyno

It does help a little

**Texpat** · 31-10-2007, 04:01 PM

I thought turbo chargers force heated exhaust air back into the mix to boost hp.

What's the difference?

**Rigger** · 31-10-2007, 04:13 PM

more pressure

**Thetyim** · 31-10-2007, 04:36 PM

Originally Posted by Texpat

I thought turbo chargers force heated exhaust air back into the mix to boost hp.

What's the difference?

Eh no.

The turbo forces clean air into the cylinders.
That way a greater mass of air is available for each combustion stroke.

The exhaust gases are used to power the turbine

**peterpan** · 31-10-2007, 04:45 PM

Originally Posted by Texpat

I thought turbo chargers force heated exhaust air back into the mix to boost hp.

What's the difference?

Tex, The last thing you want is HEATED exhaust air, thats what intercoolers are all about, they provide a degree of cooling to the intake air, lower gas temperture = greater mass = more O2= more efficient burn =more power.

**JoGeAr** · 31-10-2007, 04:50 PM

Originally Posted by AntRobertson

Originally Posted by blackgang

OK first off, I am not sure what a HOLDEN is except that it is an Australian automobile to the best of my knowledge.

It's a manufactuer. GM Holden to be precise, sells into the US now actually. Can't recall what they are re-badged as though.

The new commodore is being badged as a Pontiac G8 to be released next year.

Pontiac G8 - Wikipedia, the free encyclopedia

The Holden Monaro is badged as a Pontiac GTO in Merkinland.

Pontiac GTO - Wikipedia, the free encyclopedia

**AntRobertson** · 31-10-2007, 04:53 PM

Originally Posted by JoGeAr

Originally Posted by AntRobertson

Originally Posted by blackgang

OK first off, I am not sure what a HOLDEN is except that it is an Australian automobile to the best of my knowledge.

It's a manufactuer. GM Holden to be precise, sells into the US now actually. Can't recall what they are re-badged as though.

The new commodore is being badged as a Pontiac G8 to be released next year.

Pontiac G8 - Wikipedia, the free encyclopedia

The Holden Monaro is badged as a Pontiac GTO in Merkinland.

Ah ha! Danke, JoGeAr. Also sold in the UK under the Opel badge I think, Monaro at least. They reviewed one on Top Gear and loved it.

**Texpat** · 31-10-2007, 05:13 PM

Originally Posted by Thetyim

The exhaust gases are used to power the turbine

Got it -- cold air good, hot air bad, powered by exhaust.

**friscofrankie** · 31-10-2007, 05:54 PM

Early Ram Induction Ala Chrysler 1960:

Long isolated intake runners Like this extreme example can improve low-end torque. They would tend to run out of poop as revs rise though. A manifold such as this or any long-runner type without an open plenum would have to be matched with suitable cam timing and cylinder pressure to get the desired effect. The long-runners increase the velocity of air as it enters the cylinder allowing a higher density of air/fuel mixture available for combustion.

This is the original "RAM Induction System" offered on American V-8s in the early days of the "Muscle Car" era.
So. What is "Dual Ram?" Without knowing what the marketing yo-yos decided they could attach this super-duper sounding phrase could be attached to, one can only guess.

AS thetyim said the "Dual" may mean a system that adjusts plenum volume/runner length as RPM increases thus giving you some relief from the limitations of a simple long-runner induction system.

And Holden is a just GM R&D company that tests ideas on the guinea Pigs in upside down world before trying to sell them in the real market.

**blackgang** · 31-10-2007, 07:01 PM

Yes, and turbos do not work well with carburated engines as they depend on vacuum thru the venturis to cause the fuel to be admitted and mixed well in a vaporous state with the air stream.
But they always have worked well on diesel and injected gasoline engines, but they did have carbs that were pressure carbs and you could use with turbo or superchargers.

And yes the Holdens are badged as Pontiacs in the states.And the early Rams just picked up the air from in front, away from the hot air in the engine compartment

**Marmite the Dog** · 01-11-2007, 02:13 AM

Originally Posted by AntRobertson

Also sold in the UK under the Opel badge

Don't be silly. We don't have Opel in the UK.

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