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Forum: General Fuel Topics

06-24-2007, 11:33 AM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

Probably different to the ones I used to see in...

Probably different to the ones I used to see in the UK :)

You don't get them now because they have all rusted away!

Forum: General Fuel Topics

06-23-2007, 08:48 PM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

They actually had a 45-horsepower 4-cylinder...

They actually had a 45-horsepower 4-cylinder (Yugo 45A), and they were the butt of many jokes in Europe!. They were basically old-design Fiats (can't remember which one), so were very out-of-date....

Forum: General Fuel Topics

06-23-2007, 09:15 AM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

I was talking about weight reduction without...

I was talking about weight reduction without changing the engine - most people on here don't change engines.

However, if you did massive weight reduction, and put in a 2 cylinder tiny engine that...

Forum: General Fuel Topics

06-22-2007, 01:32 PM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

Back to my original argument. (1) Start by...

Back to my original argument.

(1) Start by realising that pulse-and-glide is the most efficient driving technique on flat ground.

Get three identical cars (e.g. Honda Accords).

One of them...

Forum: General Fuel Topics

06-22-2007, 01:22 PM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

PS for electric motor cars, the lighter the...

PS for electric motor cars, the lighter the better! The above discussion is only regarding internal combustion engines which work more efficiently at greater load (to a point).

Forum: General Fuel Topics

06-22-2007, 01:21 PM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

If you have a super light car, then the engine is...

If you have a super light car, then the engine is on all the time, so, you will be wasting a lot of power to turn the engine over, with a tiny bit of fuel for actually moving the car.

If the car...

Forum: General Fuel Topics

06-21-2007, 11:03 PM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

lca13 : In a light car, the acceleration...

lca13 :

In a light car, the acceleration will take less time, but the coast will be shorter too. If the car only weighed 1 gram, then the coast would be non-existent.

So, looking at extreme...

Forum: General Fuel Topics

06-21-2007, 11:34 AM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

The three variables are: Rolling resistance...

The three variables are:

Rolling resistance ( = weight * rolling_resistance_coefficient)
Momentum (is proportional to weight) (related to kinetic energy)
Aero drag.

So, the heavy car means...

Forum: General Fuel Topics

06-21-2007, 06:59 AM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

(I have also read the other posts above). ...

(I have also read the other posts above).

What I was getting at is a 'sweet spot'. In fact, the idea is that there is a sweet spot for economy. The 1 gram car will actually be worse (aero drag...

Forum: General Fuel Topics

06-21-2007, 05:31 AM

Replies: 59

Weight reduction - not always good?

Views: 7,484

Posted By landspeed

Weight reduction - not always good?

I was just thinking about it...

Pulse and glide is the best way to increase engine efficiency (versus driving at a constant speed in gear).

If your car had a mass of 1 gram, but was the same...

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