PolyQuad cylinder head concept ? - LotusTalk - The Lotus Cars Community
 
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post #1 of 6 (permalink) Old 07-16-2016, 10:36 AM Thread Starter
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Vizard's PolyQuad valve system/cylinder head concept ?

I'm seeking an additional intel on the Polyquad valve arrangement concept described by D. Vizard here:
Polyquad Article - MotorTech Magazine
The PolyQuad application is discussed in detail in the 2012 book by David Vizard "How to Port and Flow Test Cylinder Heads."


So far I found a few leads:
Holler: Poly Quad Revisited
Poly Quad Head - Anyone heard of it or tried it? - Miata Turbo Forum -Boost cars, acquire cats.

Any discussion on other forums, anywhere?

Last edited by MRDANGERUS; 07-16-2016 at 05:13 PM.
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post #2 of 6 (permalink) Old 07-16-2016, 05:30 PM Thread Starter
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Cylinder Head Porting

Interesting "how to" article:

https://www.allpar.com/fix/holler/head-porting.html
and part 2
https://www.allpar.com/fix/holler/head-porting2.html

~~~~~~~~~~~~~~~~~~~~~~~~~~~
Another way of generating combustion chamber swirl are "Somender Singh Grooves". They cost almost nothing and are very simple comparing to the Polyquad method.
They can be implemented any time you take the head off!

http://forums.turbobricks.com/showthread.php?t=66779

US Patent 6237579
ABSTRACT: combustion chamber design layout of grooves or channels or passages formed in the squish band to further enhance turbulence in the charge prior to ignition as compared to existing designs with squish bands or hemispherical layouts in I.C. Engines. These grooves or channels or passages after ignition direct the flame front to cause multi point ignition during the combustion cycle resulting in the following distinct advantages over existing designs in practice. First, quicker and complete clean burn combustion; second, lower operating temperatures due to the higher flame velocities; third, enhanced torque and power through the entire range resulting in better fuel economy with lower Emissions; and fourth, smoother engine operation through the entire range enhancing engine life.

Explanation and theory of the Somender Singh Grooves: http://rexresearch.com/singh/singh.htm#4usp

Also, see test reports proving the theory here: http://www.herningg.com/singh/
The first tests were normal engine running tests. These simulated normal types of engine loading as one would see going down the road, anywhere from in town to high speed on the highway. All engine running parameters, dynamometer loading and tailpipe emissions parameters were collected by the computerized data acquisition system. Exhaust gases readings were obtained by a 5 gas exhaust analyzer. Right click to download.
Running Analysis Report. Report is in PDF format. You will need Adobe Acrobat to open this document.

The second tests were ionization current tests. These tests utilized the method of applying a voltage across the spark plug after the coil spark to induce a minute current during the combustion process. This current could then be used as a combustion signature and give insight into many of the characteristics of the combustion process. This report shows graphically the combustion signatures as a function of crank angle. Right click to download.
Ionization Current Analysis. Report is in PDF format. You will need Adobe Acrobat to open this document.
.

Notice significant carbon deposits (indication of un-burned fuel) in the cylinder squish areas, last pic.
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Last edited by MRDANGERUS; 07-17-2016 at 09:14 AM.
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post #3 of 6 (permalink) Old 07-17-2016, 07:44 AM Thread Starter
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Grooves can be added by using a hand held file.
If you machine your head, be careful not to cut trough, all the way to the water jacket, as this poor chap here.
Garrett Robert Herning - Projects Singh Groove Experiment
.

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post #4 of 6 (permalink) Old 07-17-2016, 10:03 AM
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Hmmmmmmmmmmm...don't sharp edges contribute to detonation?

I don't think I will be laying into my head with a file anytime soon
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post #6 of 6 (permalink) Old 06-08-2019, 12:17 PM Thread Starter
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