3 minutes ago, lawnmowerman said:

 

Don't know if the current ones are. I just had a look at VW's website and came up with this.  www.volkswagen.co.uk/technology/petrol/tsi

 

Who knows what makes sense now in VAG land.

 

 

Indeed - Confused.com. Will probably give this engine a wide berth for now. Shame as I think my old brigade 1.4tsi is great.

 

 

Edited 11 January, 20197 yr by bigjohn

8 minutes ago, bigjohn said:

 

I thought it was just turbo? - The twin charger was surely just the earlier higher powered EA111 engines as per Fabia II VRS? 

Doh - looks like it's a twin charger , one to cross off the list then. That  explains it then!

 

Do all the 1.5tsi engines have a Supercharger then?

 

 

I think it might be an older design but that is why you might have seen reference to the Miller cycle though.

 

I am sure there are many more knowledgeable than me that might clarify.

 

2 minutes ago, lawnmowerman said:

 

I think it might be an older design but that is why you might have seen reference to the Miller cycle though.

 

I am sure there are many more knowledgeable than me that might clarify.

 

 

Looks like mis-information around then, eg

https://drivemag.com/news/new-1-5-tsi-130ps-engine-for-vw-golf-shows-the-limits-of-combustion-tech

 

5 minutes ago, bigjohn said:

 

Looks like mis-information around then, eg

https://drivemag.com/news/new-1-5-tsi-130ps-engine-for-vw-golf-shows-the-limits-of-combustion-tech

 

 

How unlike VAG to hi-jack engine types and rename as they think fit. In fairness if they engineer it to replicate a Miller cycle engine then O.K.

 

The whole premise of the Miller cycle was to keep the inlet valve open and compress the fuel charge against the super-charger (as I understood it from college all those years ago). I know the principle but have no practical experience of this technology.

 

I should think Estateman may understand it better and be able to give a more understandable explanation.

 

 

 

I don't kno what you lot are reading but 1.5tsi has never ever had a supercharger. Miller cycle in this context refers to a general technique using late/early opening of valves to achieve asymmetrical compression and expansion ratios which gives increased efficiency. Ralph Miller in the fifties described many arrangements where this could be achieved including some with a supercharger, however a supercharger or indeed a turbocharger is not strictly required to achieve "miller cycle” operation.

 

Miller cycle is widely acknowledged just to be a development of the Atkinson cycle which was first described in 1882, the main difference being that Miller applied for and got a bunch of patents on his many variations on a theme.

 

Ralf Budack, of VW, recently took the Miller cycle and again tweaked it and applied VW-Audi cam profile switching tech to develop the latest 2.0tsi gen 3b engine, soon to be in a car near you. VW call this Budack cycle.....

 

BTW the 1.5tsi 150ps used by Skoda is a conventional Otto cycle engine, the Miller cycle version develops only 130ps and is used in VW and Audi Bluemotion models.

Edited 11 January, 20197 yr by xman

46 minutes ago, xman said:

I don't kno what you lot are reading but 1.5tsi has never ever had a supercharger. Miller cycle in this context refers to a general technique using late/early opening of valves to achieve asymmetrical compression and expansion ratios which gives increased efficiency. Ralph Miller in the fifties described many arrangements where this could be achieved including some with a supercharger, however a supercharger or indeed a turbocharger is not strictly required to achieve "miller cycle” operation.

 

Miller cycle is widely acknowledged just to be a development of the Atkinson cycle which was first described in 1882, the main difference being that Miller applied for and got a bunch of patents on his many variations on a theme.

 

Ralf Budack, of VW, recently took the Miller cycle and again tweaked it and applied VW-Audi cam profile switching tech to develop the latest 2.0tsi gen 3b engine, soon to be in a car near you. VW call this Budack cycle.....

 

BTW the 1.5tsi 150ps used by Skoda is a conventional Otto cycle engine, the Miller cycle version develops only 130ps and is used in VW and Audi Bluemotion models.

 

I was looking to find a reference from VW that supported bigjohn's "Miller Cycle" quote.

 

This backs up his suggestion.

 

"When you drive one of our TSI cars you don't have to choose between performance and economy. TSI engines offer an enjoyable and involving drive, while cutting fuel consumption and CO2 emissions. Because TSI engines are cleaner, you'll also save on car tax. So they have a smaller impact on the environment, are kinder to your pocket - and, best of all, they're great fun to drive.

What is TSI?

TSI is our pioneering technology for petrol engines. TSI engines are compact, high-powered and use less fuel. TSI technology blends the best of our TDI diesel and FSI (Fuel Stratified Injection) engines.

.......

 

"Direct petrol injection is combined with a turbocharger or charge compression with a turbo and a supercharger (early variant 1.5 TSI Evo engines) working in tandem. This enhances the engine's combustion efficiency so the TSI engine power output is much higher than that of conventional, naturally aspirated engines."

 

Straight from the horse's mouth so to speak.

 

Bill 

 

Nothing to be confused about XMAN - I just copied and pasted from VW what they said about supercharging and the 1.5 TSI. I do not say it is a current engine but it is currently on their website and it does mention super-charging which was the basis of the Miller cycle originally.

 

Regards, Bill 

 

VW UK marketing dept. not proof reading the boIIox it publishes I suspect.

Bring back the old non pd tdi...

Found this pic from 2016 while searching for some work related stuff. My old ALH donkey...

 

 

VW were just to slow in building simple Petrol Hybrids with quality control & warranties worth having.

They should have been doing more in Slovakia much sooner, they had the factories there.

Kia did it and Hyundai get on with doing it in the Czech Republic.

 

 

 

 

This is the Niro 2, so the basic one, 16" Wheels and Part Leather & Cloth.

 

Edited 12 January, 20197 yr by Skoffski