Oddball engines and prototypes

[Frits Overmars]

Interesting you should say that. I'm looking for a replacement for my Golf GTi and my mechanic, who is also a sponsor for my racing, has told me to stay the hell away from CVTs. Even on 2015 model CVTs he won't even change the transmission oil. Interesting cos he's up to ears in variable valve trains and alsorts of complex technical stuff, but he refuses to have anything to do with CVTs.
Given that I trust his word on all things car related I'm going for a twin clutch DSG seeing as it's bloody near impossible to find a modern manual these days.

DSGs are all right, but they are quite heavy and more complicated than a seamless gearbox ought to be, if you ask me. And for a manufacturer they are much more expensive to implement than a CVT. For the moment though, DSGs can handle more torque. I wish Van Doorne would market that 800 HP Williams F1-CSV...
http://www.youtube.com/watch?v=x3UpB...eature=related

Here in Germany where I spend most of my days, you hear the exhaust 'pop' of DSG-shifting VWs, Audis and Porsches all day. They are the result of the ignition cut during shifting (so the power is interrupted; it's not really seamless shifting), after which the unburnt mixture ignites in the catalyzer: pop.
As most of these cars also have direct injection, they could as well cut the injection instead of the ignition during shifting but I suspect that these 'pops' are deliberately maintained; if your car doesn't pop, you don't count.

CVTs need a very special type of oil; if you use regular transmission oil, you will destroy them.

[Mental Trousers]

Here in Germany where I spend most of my days, you hear the exhaust 'pop' of DSG-shifting VWs, Audis and Porsches all day. They are the result of the ignition cut during shifting (so the power is interrupted; it's not really seamless shifting), after which the unburnt mixture ignites in the catalyzer: pop.
As most of these cars also have direct injection, they could as well cut the injection instead of the ignition during shifting but I suspect that these 'pops' are deliberately maintained; if your car doesn't pop, you don't count.

That's one of the reasons why I'm liking the DSG box, it's just like the quick shifter on my bike, that's got to be a good thing.

[Edbear]

Interesting you should say that. I'm looking for a replacement for my Golf GTi and my mechanic, who is also a sponsor for my racing, has told me to stay the hell away from CVTs. Even on 2015 model CVTs he won't even change the transmission oil. Interesting cos he's up to ears in variable valve trains and alsorts of complex technical stuff, but he refuses to have anything to do with CVTs.

Given that I trust his word on all things car related I'm going for a twin clutch DSG seeing as it's bloody near impossible to find a modern manual these days.

I am on my second vehicle with a CVT. my wife's Mitsi Colt Plus has clocked up 107,000km and has just been serviced. The mechanic who did the Trans flush said it was the smoothest running CVT he had ever experienced.

My Suzuki Kizashi Ltd. has just been traded at 94,000km and the CVT was serviced at 90k. Still running perfectly. Now I have a Mitsubishi Outlander PHEV VRX, with CVT.

CVT's are found behind 3.5lt V6's these days. Once you get used to them you won't want anything else.

For one of the best DSG transmissions try the Skoda Octavia RS with the turbo 2lt.

[Frits Overmars]

CVT's are found behind 3.5lt V6's these days. Once you get used to them you won't want anything else.

Amen to that.

For one of the best DSG transmissions try the Skoda Octavia RS with the turbo 2lt.

Skoda is the poor (=sensible) man's alternative to Volkwagen. Under the Skoda badge it's all VW technique. VW offers a 300 HP Golf GTI now and a 400 HP version is on the way.
And here's me with my 70 HP Peugeot diesel. At least that's what it had when it was new, 270.000 km ago. Maybe it's time to lose the particle filter .

[Mental Trousers]

CVT's are found behind 3.5lt V6's these days. Once you get used to them you won't want anything else.

Driven a few, still not getting one.

For one of the best DSG transmissions try the Skoda Octavia RS with the turbo 2lt.

Skoda is the poor (=sensible) man's alternative to Volkwagen. Under the Skoda badge it's all VW technique. VW offers a 300 HP Golf GTI now and a 400 HP version is on the way.

They may be cheap in Europe but here I haven't seen one for less than twice the price of a Golf GTi. Shame, cos I've been liking what I see in the Octavia wagon.

[WilDun]

Amen to that.

Skoda is the poor (=sensible) man's alternative to Volkwagen.
And here's me with my 70 HP Peugeot diesel.

Things haven't changed a lot then!
Way way back in the mists of time after I fell off my last motorcycle and I was forbidden by my wife to ride anymore , so to console myself I bought one of the old rear engined Skodas (100 MB?) for $300, it was a 'fixup' job ( I couldn't bear to see it go to the tip). The guy said that he tried everything to get it going and had lost interest in it. My wife didn't like it any more than she liked the bike either and refused to sit in it! - missed out in a major life experience I reckon!
All that was wrong was the fuel pump sight glass clamp had a stripped thread, fixed that and away she went. Changed the oil and filter and the love affair began! Never used a drop of oil ever in the two years I owned it and no leaks. Very misunderstood car! although the rear independent 'swing' axles required some understanding on bumpy corners, it usually stuck to the road well.
So I do understand you still having the Peugeot diesel - For me at least, I guess, it's a little like having a brand new Ferrari - a 'look at me' type of thing, only at the other end of the scale! sort of thumbing your nose at the rich and flamboyant types!
(sorry I'm a miserable old git).

[James Deuce]

CVTs are a horrible driving experience. I already have enough screaming in the car without the engine constantly doing its nut as well.

[Edbear]

Amen to that.

Skoda is the poor (=sensible) man's alternative to Volkwagen. Under the Skoda badge it's all VW technique. VW offers a 300 HP Golf GTI now and a 400 HP version is on the way.
And here's me with my 70 HP Peugeot diesel. At least that's what it had when it was new, 270.000 km ago. Maybe it's time to lose the particle filter .

Quite right, of course.

[Edbear]

CVTs are a horrible driving experience. I already have enough screaming in the car without the engine constantly doing its nut as well.

We all have differing driving styles and requirements. For me, I am happy with CVT but the only DSG box's I have experienced were in a Maserati and and a Smart and they were horrible!

[Mental Trousers]

We all have differing driving styles and requirements. For me, I am happy with CVT but the only DSG box's I have experienced were in a Maserati and and a Smart and they were horrible!

Maserati mostly uses a ZF 6 speed automatic so it's pretty average. As for the Smart, you admit to having driven one?

The DSG transmissions (dual clutch) are only made by the VW group and you'll find them in all modern VWs, Audis, Porches, Skodas, SEATs, Bentleys, Bugattis and Lambourghinis.

[Frits Overmars]

Skodas may be cheap in Europe but here I haven't seen one for less than twice the price of a Golf GTi. Shame, cos I've been liking what I see in the Octavia wagon.

Good news for you then: there is a Golf GTI Wagon on the way, with 2 liter 300 HP turbo, DSG trannie and all-wheel drive.

[husaberg]

Barr and Stroud this article was written in 1990

Remember click on them about 3 times.

[WilDun]

I have seen a lot of stuff on the Napier Deltic engine before ( I think it may have been mentioned earlier in this thread) and hadn't really checked it out properly, but it is a very interesting and successful engine used mainly in locomotives and patrol boats since the fifties and it has only recently been retired. Seems it was inspired by the pre-war diesel aircraft engines pioneered by Junkers.

http://www.craftsmanshipmuseum.com/Tomlinson.htm

This one is slightly different, being a 160cc model, so it must be even more of a challenge to build than the full size!
It is a very interesting description of its design and construction and a credit to the guy who built it - no castings were used I believe!

I guess Flettner would have been quite familiar with this engine (ie the fullsize one) when he built his horizontally opposed uniflow engine.

[James Deuce]

The Junkers Jumo 205 was a an extremely successful opposed piston diesel. Their main early WWII usage was the high altitude reconnaissance version of the Ju-86.

https://en.wikipedia.org/wiki/Junkers_Jumo_205

Napier license-built their own version of the Jumo 204 pre-WWII and I suspect the Deltic gained a significant amount of data from that programme.

[husaberg]

FLETCHER TWO-STROKE

http://www.users.globalnet.co.uk/~pa...cc/arc0563.htm

Of the advantages claimed for the Fletcher engine, the most important are low weight, freedom from seizure and improved lowspeed pulling power. In construction, the Fletcher two-stroke differs fundamentally from conventional engines of the type, for the cylinder is a light-alloy casting with an unsleeved bore, in which operates a steel piston with skirts extended above its crown.

Ports are cut at the top of the skirts, and these, of course, correspond with ports in the alloy barrel. In place of the normal cylinder head is fitted a junk head, carrying two piston rings and provided with oil grooves. This head is a sliding fit within the piston, and has a deflector formed upon its crown opposite the transfer port.
Mixture is induced into the crankcase through a simple rotary valve and is transferred through a long transfer port in the normal way. Port timing is controlled in the usual way - i.e., by the relative movement between the ported piston (which can be considered as a form of moving cylinder barrel) and the junk-head, which forms in effect a static piston.

The unusual components showing the cylinder head and static "piston",
the mobile ported sleeve and the cylinder barrel proper.