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  #1  
Old September 29th, 2016, 11:18 AM
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Variable Compression Turbo

I really wish I was posting this in the Land Rover Tech Section. On the positive side Tata has been busy developing new ways to build hand-dyed leather dashboards.

This quick read is interesting. Note, they use a spray-in liner to reduce weight. Hmm, maybe we can get a can for our D2 4.6's.



Infiniti Variable Compression Turbo Breaks Cover
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Old September 29th, 2016, 12:00 PM
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In other words, a variable throw crankshaft? Cool idea but what about long term reliability?

Mike & Carrie

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Originally Posted by 1of40 View Post
I really wish I was posting this in the Land Rover Tech Section. On the positive side Tata has been busy developing new ways to build hand-dyed leather dashboards.

This quick read is interesting. Note, they use a spray-in liner to reduce weight. Hmm, maybe we can get a can for our D2 4.6's.



Infiniti Variable Compression Turbo Breaks Cover
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Old September 29th, 2016, 12:06 PM
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I assuming Long Term Reliability is no longer in the Automaker glossary. Plastic Bumpers + Auto Rear Door Sensors does not equate to LT Reliability.
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Old September 29th, 2016, 12:19 PM
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It appears to operate a bit like Double VANOS.

There is, thermodynamically speaking, an increase in the thermal efficiency of an engine as the static (or effective static) compression ratio increases. It's one of the biggest stumbling block of gas engines - especially turbocharged ones - preventing pre-ignition at high compression ratios.

I'm guessing it really boils down to increasing MPG for gas engines.
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Old September 29th, 2016, 12:21 PM
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I agree that the buying public has accepted plastic cars. But they still expect the drive train to last a long time.

When I was in high school in the early '70s, a gas engine that went 100,000 miles without needing an overhaul was impressive. Now people commonly report 200,000 miles on their engine and the rest of the drive train.

Mike & Carrie

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I assuming Long Term Reliability is no longer in the Automaker glossary. Plastic Bumpers + Auto Rear Door Sensors does not equate to LT Reliability.
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Old September 29th, 2016, 12:25 PM
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Awesome technology. But more moving parts equals another potential failure.
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Old September 29th, 2016, 02:21 PM
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One question I have is whether or not the technology is moot - especially in small prime movers, given that three-phase AC motors have essentially limitless lifetimes and one moving part.

I can understand that internal combustion will be with humans pretty much forever (since there are many situations where an electric motor just won't be space-efficient or have the range of ICE's) but I feel like the days of the ICE for passenger cars specifically are numbered.
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