Mazda Homogeneous Charge Compression Ignition 2018

[Munter]

http://www.roadandtrack.com/new-cars/car-technolog...

Sounds interesting. Why's it going to go wrong?

[stevieturbo]

Modern tech go wrong ? lol

And often manufacturers make big claims...especially when it comes to mpg's. Reality tends to be they lie like fk and nobody in the real world can even get close to their claims

[227bhp]

Interesting, I wonder what the static CR would be to autoignite petrol, 18:1?

[stevieturbo]

No idea...it also doesnt mention whether it's n/a or boosted ?

Or whether the engine will last long enough before the oil pickup clogs up and fks the rest of the engine as many of their other DI models lol

[AER]

227bhp said:

Interesting, I wonder what the static CR would be to autoignite petrol, 18:1?

It's usually done by increasing the trapped residuals rather than increasing the compression ratio á la diesel.

[227bhp]

AER said:

227bhp said:

Interesting, I wonder what the static CR would be to autoignite petrol, 18:1?

It's usually done by increasing the trapped residuals rather than increasing the compression ratio á la diesel.

Do you have any more info on this or how it works?

[Munter]

227bhp said:

Do you have any more info on this or how it works?

The blurb on the page for the current skyactiv engines discusses how they manage to get the current high compression ratio by removing "residual gas" and thus reducing the temperature in the cylinder.
http://www.mazda.com/en/innovation/technology/skya...

And there's a page for the diesels as well that mentions opening the exhaust valves on the inlet stroke to increase temperatures on warm up, which allows them to use a lower compression on a diesel engine. Which is an interesting reversal.
http://www.mazda.com/en/innovation/technology/skya...

Edited by Munter on Monday 23 January 10:07