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FE Power Forums => FE Technical Forum => Topic started by: fastback 427 on November 01, 2020, 12:56:48 PM

Title: Dove pie heads
Post by: fastback 427 on November 01, 2020, 12:56:48 PM
Found some pretty cool stuff on Facebook.
Title: Re: Dove pie heads
Post by: Dumpling on November 01, 2020, 02:17:18 PM
What does "0" swirl mean/imply?
Title: Re: Dove pie heads
Post by: WConley on November 01, 2020, 05:47:34 PM
Quote from: Dumpling on November 01, 2020, 02:17:18 PM
What does "0" swirl mean/imply?

Numbers like that tell me there is no instrumentation hooked up to measure swirl.  On a flowbench, a device called a "swirl torque meter" is often used in the space below the chamber.

You can see a diagram of a swirl torque meter here (Sorry - Couldn't link the image...):

https://www.researchgate.net/figure/Swirl-torquemeter-principle-of-operation-7_fig1_254758698
Title: Re: Dove pie heads
Post by: Ghoughton on November 01, 2020, 08:17:37 PM
Scott did a nice job on those. Really impressive numbers
Title: Re: Dove pie heads
Post by: Dumpling on November 02, 2020, 12:24:25 PM
Quote from: WConley on November 01, 2020, 05:47:34 PM
Quote from: Dumpling on November 01, 2020, 02:17:18 PM
What does "0" swirl mean/imply?

Numbers like that tell me there is no instrumentation hooked up to measure swirl.  On a flowbench, a device called a "swirl torque meter" is often used in the space below the chamber.
...


Thanks. But isn't swirl important?
Title: Re: Dove pie heads
Post by: WConley on November 02, 2020, 12:41:07 PM
Swirl tends to improve lower-end torque, due to better charge motion / improved fuel mixing.  At higher RPM it's far less important than overall flow.  This looks like an all-out race port that's optimized for top end HP.
Title: Re: Dove pie heads
Post by: FrozenMerc on November 02, 2020, 01:33:25 PM
Swirl is much more important with diesels due to the shape of combustion chamber and the way the injectors introduce fuel into the cylinder.  Large amounts of swirl are necessary to promote homogeneous mixing of the fuel and air during the injection phase, which in turn aids in power production, a clean burn, and ease of starting.  The intake ports are designed to optimize swirl because of this and swirl in a diesel will be as much as 3 times faster than a similar sized gasoline engine.  Many a back yard engine builder has screwed up their diesel cylinder heads trying to port them using a gas engine mentality.

Gale Banks has put together a bunch of good information on swirl if your are interested in more reading.
(https://official.bankspower.com/wp-content/uploads/2020/07/2b-1024x576.jpg)

https://official.bankspower.com/what-are-squish-and-swirl-and-why-are-they-important-in-a-diesel-engine/ (https://official.bankspower.com/what-are-squish-and-swirl-and-why-are-they-important-in-a-diesel-engine/)
Title: Re: Dove pie heads
Post by: WConley on November 02, 2020, 02:25:27 PM
Nice post, FrozenMerc!  That clearly explains something I had only heard about.

- Bill