Author Topic: Dove pie heads  (Read 849 times)

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fastback 427

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Dove pie heads
« on: November 01, 2020, 12:56:48 PM »
Found some pretty cool stuff on Facebook.
Jaime
67 fastback 427 center oiler 428 crank Dove aluminum
top end toploader
67 fairlane gta cross bolted 12:1 390 Dove aluminum top end c6 3600 stall
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76 f350 dually 390 mirror 105 4bbl 4spd
74 f100 xlt 390 c6 factory ac

Dumpling

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Re: Dove pie heads
« Reply #1 on: November 01, 2020, 02:17:18 PM »
What does "0" swirl mean/imply?

WConley

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Re: Dove pie heads
« Reply #2 on: November 01, 2020, 05:47:34 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
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Ghoughton

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Re: Dove pie heads
« Reply #3 on: November 01, 2020, 08:17:37 PM »
Scott did a nice job on those. Really impressive numbers

Dumpling

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Re: Dove pie heads
« Reply #4 on: November 02, 2020, 12:24:25 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?

WConley

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Re: Dove pie heads
« Reply #5 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.
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FrozenMerc

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Re: Dove pie heads
« Reply #6 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/what-are-squish-and-swirl-and-why-are-they-important-in-a-diesel-engine/
« Last Edit: November 02, 2020, 01:36:53 PM by FrozenMerc »

WConley

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Re: Dove pie heads
« Reply #7 on: November 02, 2020, 02:25:27 PM »
Nice post, FrozenMerc!  That clearly explains something I had only heard about.

- Bill
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