Mazda 40:1 compression engines?

[zorobabel]

Originally Posted by StevieC
Although I don't think rust is a problem where you are so maybe something else?

Must be demographics.

Originally Posted by StevieC
Our friends 2018 Mazda CX-5 is really smooth and refined.

The ones I drove were 1st generation. Noisy and a rough/rattly ride. I'm sure the oversized rims don't help.

 

[StevieC]

Originally Posted by PimTac
A lot of those rusted out Mazdas came off of Ford assembly lines so that should be considered as well.

Good point

Originally Posted by zorobabel
The ones I drove were 1st generation. Noisy and a rough/rattly ride. I'm sure the oversized rims don't help.


I haven't been in one of the older ones... So maybe that is the difference.

 

[KrisZ]

Originally Posted by PimTac
A lot of those rusted out Mazdas came off of Ford assembly lines so that should be considered as well.


All first gen Mazda 3s came from Japan and they rust badly and quickly without any additional rustproofing regimen.
The exception seems to be the Mazdaspeed 3.

 

[PimTac]

Originally Posted by StevieC
Originally Posted by PimTac
A lot of those rusted out Mazdas came off of Ford assembly lines so that should be considered as well.

Good point

Originally Posted by zorobabel
The ones I drove were 1st generation. Noisy and a rough/rattly ride. I'm sure the oversized rims don't help.


I haven't been in one of the older ones... So maybe that is the difference.



The early generation CX5 was known for noise intrusion. Mazda set out to make them quieter with a stiffer chassis, more soundproofing and more seals. The 2017 and newer are very quiet. These techniques are being used on all their models now.

 

[Linctex]

Originally Posted by dnewton3
A diesel with 14:1? That's low!


Maybe for modern engines.

LOTS and LOTS of older diesel ran with around 12:1..... maybe even lower

 

[DGXR]

This Skyactive-X engine design is supposed to revolutionize the industry. The basic concept reminds me of the original Honda CVCC, although the compression ratio is a different factor.
I am very interested to see how this plays out, once past the initial bugs and hiccups.

 

[pezzy669]

I have to say even despite the two Mercedes in my sig, to this day my Mazda3's (2010 and 2014) were still my favorites. They honestly had the best blend of performance (2.5L), reliability, comfort and features for the price.

If something ever happens to my E350 I would very strongly consider another Mazda3 Grand Touring.

 

[bobdoo]

Engineering Explained

How Mazda Is Saving The Gasoline Engine - SkyActiv-X

https://www.youtube.com/watch?v=yNSxow3W7ek

"The ideal otto engine is something you may learn about in an introductory course of thermodynamics. It teaches important lessons about thermal efficiency, and it's the ultimate unachievable goal of every engineer who's ever worked on internal combustion development.

But that certainly doesn't stop Mazda from trying. With their eyes set on the the ideal engine, they made changes from their SkyActiv-G engine to improve thermal efficiency in seven key areas. Most importantly, it's the world's first production implementation of compression ignition in a gasoline engine. More specifically, compression ignition timed with a spark plug: SPCCI. In this video we'll break down Mazda's SkyActiv-X engine, and talk about four of the major improvements they've made in pursuit of the ideal engine. "

 

[1JZ_E46]

Really excited about Skyactiv-X, and the new Mazda3 hatch is absolutely beautiful. Would probably wait until the 2nd year of production before buying. Really hoping Mazda offers Skyactiv-X paired with an MT gearbox.