INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Mazda is going to use HCCI in 2019

Mazda is going to use HCCI in 2019

(OP)
Anyone here have any detailed information on the construction of the engine? I'm guessing the cylinder block and head are NOT aluminum.

RE: Mazda is going to use HCCI in 2019

Why would you guess that? The Mazda engine appears to be an SI gasoline fuel engine that has HCCI capability under certain operating conditions. The HCCI combustion process is notoriously difficult to control even under the best circumstances, so I'd speculate this Mazda engine will only use HCCI under light load operation. Fortunately, production auto engines spend much of their time operating at light load. In general, the very rapid heat release rate characteristics of HCCI combustion results in higher peak cycle pressures. But limiting HCCI combustion to light load operating conditions should keep cylinder pressure levels within the capability of modern automotive aluminum blocks/heads.

RE: Mazda is going to use HCCI in 2019

The current Skyactiv-G engine block is aluminum. Honda diesels (not sold in North America) use aluminum blocks. I don't think this will have peak cylinder pressure as high as a turbodiesel does.

Wonder what it's going to sound like? The nature of HCCI combustion ought to make it sound like the worst case of detonation you've ever heard ... unless they've managed to control the combustion rate somehow.

RE: Mazda is going to use HCCI in 2019

Nothing like the sound of detonation AFAIK.

Detonation is combustion front travelling at mach 1, hence the pressure front builds as combustion progresses - forming a shock wave which is capable of applying a large and rapid spike of force to the chamber wall.

HCCI produces a myriad of tiny shock waves originating from all points in the chamber - there is no chance they will arrive simultaneously at the chamber wall.

je suis charlie

RE: Mazda is going to use HCCI in 2019

The summary I read said they don't run HCCI at full load and retain spark plugs to aid combustion when lean, so it's clearly a partial load operating mode. So is every other HCCI I've seen mentioned by the majors in the DOE HCCI Consortium. Kudos to Mazda. They are small but have one of the best profit margins in the business while sustaining a very productive engine R&D effort. They were also issued a new patent on the Wankel and have said it will be HCCI capable.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

eBook: Product Innovation Platform Assessment
Over the past few years, there has been growing interest among industrial companies and solutions providers with regards to Product Innovation Platforms, where design, manufacturing and IoT tools are bundled into a single software package. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close