Has any one noticed the way car manufacturers are churning out a big car with a small engine eg the Nissan Qashqai a big body with a small petrol engine ? you can go for the diesel version mind you.
What is going to happen to us down the line when, we need a heavy towcar with a powerful engine ?I know a 1.2 Qashqai aint gonna pull a van the weight of mine unless they super charge it then again it must put some strain on the engine.
We are, at present, looking at 5th wheelers. These will require a 3lt car to pull them.
Not a problem though, just something we need to consider if we decide to go that route.
The modern small turbo petrol engines are happening now because the technology only now exists to build such an engine with long term reliabilty. Engine power/torque are governed by 2 factors. 1 is the rate fuel/air mixture can be passed through engine & out of the exhaust, 2 is the ability of the engine to stay in one piece. The size of the engine is not really a factor at all.
1.6litre Formula 1 engines today are reliably producing 600bhp. In the 80s 1.5litre F1 engines were producing 700bhp but were abandoned due to poor reliabilty. Ie technology has moved on.
So to answer your question, when we need a heavy towcar with powerful engine in 10yrs time it will probably be 1 litre producing over 200bhp with torque to match. If you don't believe that ask yourself would you have believed anybody in 1970 who told you 40yrs on you would be driving a 2litre diesel with 170bhp?
It's called progress. Early diesels were big normally aspirated engines that were slow & dirty in cars. Now a 1.6 diesel in a car is probably the norm and easily keeps up with modern needs.
Big engine cares are still about if required. They are just not mainstream.
I,v just bought a 110 bhp 1.7D Ecoflex 2012 Astra estate to tow our van and according to the towcar info site its a perfect match, i know i wont get into 6th gear while towing but 99% of the time iam not towing and need something economical to run, plus i can get it in the garage which reduces my insurance cost's, works for me.
there is no substute for a large capacity engine for power and reliability,they tried that years ago in trucks small cc engines and big turbos,had to rev the nuts off to get anywhere.
When we took our 3.5 tonne 6-wheel trailer to France this year, our V8 Discovery had to work hard on some of the gradients, so Lord knows how a smaller engined car would cope.
The V8 is around 180bhp, the TD5 around 135bhp. Both are 2.2 tonnes unladen.
The problem is that people still want bigger cars with the space to carry passengers and luggage but also want better economy together with the legislators wanting more economy and less emissions.
The result is bigger cars with smaller engines needing more gears to keep the engines in the best range to give adequate performance (torque more important then power).
One downside, to those towing heavy trailers and caravans, is the reduced range of vehicles heavy enough to tow safely.
I prefer the old USA answer to this (there is no substitute for cubes) where they had big engines and, sometimes, only 3 speed auto boxes with 1st and 2nd still not been needed as you could pull away in top anyway...
... although I would not like to pay the fuel bill for one of those on the roads over here with the cost of fuel these days, 22-30mpg is OK but I would be a bit bankrupt getting under 10mpg.
Environmental pressure which in turn shapes fiscal policy mean the trend to smaller lighter cars and along with it engines, will dictate things and we will have to get used to it.
For a while bigger engine vehicles will be about till they work their self out of the system; probably in the short term at very attractive second hand prices as running cost will be high. Unless retrospective UK legislation mops up these "dirtier" engines as in some countries.
It is inescapable a vehicle aimed at the domestic car market will be optimised for that task; so it is unrealistic to clap a caravan on the back, doubling most loading and expect anything other than a compromise. If you want a tow car then you have to buy a vehicle designed as a towcar, rather than a family car. Hence, buying workhorses as the Landcruiser and its ilk.
Thankfully the torque delivery of these latest generation engines is over a wider band than even a few years ago and massive developments have been made in lubricants.
Coupled to this the multi speed autobox has developed a great deal; with "inteligence" this can adapt to the towing loading better than sparse ratio boxes of old.
One needs to unthink all that has gone before. Forget previous technology & think what is possible. The principle of forced induction has always been understood but only recently has technology allowed it to be employed in modern mass production techniques.
The principle comes first, that the power of the engine is limited only by the rate that fuel can be put into the engine, burnt & the fumes expelled. After that the engine designer has a free hand within the technology available. There is nothing in science that dictates that an engine should be of a given size for a given power.
So don't think about the engine, think about the means of the forced induction, turbocharger perhaps or some new design. In future technology the means of the forced induction will become more important than the engine itself.
Forced induction allows a very basic & simple engine that needs only to be mechanically strong enough to stand the stresses imposed upon it. It is only now that technology is allowing this to happen & certainly is the future because it will allow simple fuel efficient engines to be mass produced cheaply.
Daughter has a 1.2 Turbo petrol Qashqai solo use only, rubbish when loaded and average mpg 32. They tow with a 150bhp 08 Vectra SRi. The Qashqai will be replaced by a 1.5 Diesel Note shortly but it will not be used for towing. I agree will lots of the other comments that there is no substitute for cc`s
Quote: Originally posted by listerdiesel on 19/12/2014
When we took our 3.5 tonne 6-wheel trailer to France this year, our V8 Discovery had to work hard on some of the gradients, so Lord knows how a smaller engined car would cope.
The V8 is around 180bhp, the TD5 around 135bhp. Both are 2.2 tonnes unladen.
Peter
But the diesel may have more torque and low down where you need it. It will be geared lower also.
I had petrol and diesel versions of the Mondeo. Petrol one had more BHP. But the diesel has way more torque and tows much better.
Its a more relaxed tow, Less gearchanges.
Its the turbocharger or other means of forced induction that allows wider spread of torque not fuel type. As pointed out, forced induction is the future, whether engines are petrol or diesel or some other fuel will depend on future emission laws & so on.