douglee25
m3booooy
- Location
- South Jersey
Maico said:
I found a group K article here and I'll copy this portion.... The main link is http://www.groupk.com/archbtl97.htm
Still think they work?
Doug
"The text of the article seemed pretty straight forward, however we have some major disagreements with a few technical points. Page 109 states that the spiral cut head dome pattern puts the mixture into a swirl motion. While we have seen other shops that have mimicked this same feature, there is no test data ever produced by any reputable engine builder/designer that confirms that any such "swirl effect" helps or even exits. No one has ever proven that such a dome shape actually induces a swirl motion on to the mixture, nor that such a motion does actually net a performance benefit..."it simply LOOKS like it ought to work". Sharp edges, like the ones that exist in the OP spiral domes, are avoided by most engine builders because they are such a high risk starting point for pre ignition. The disadvantages of these shape edges is only one of the reasons that spiral cuts like this are not employed in any true racing engine designs. If OP has definitive, repeatable, test data that proves this design does have performance merits over standard hemispherical domes in high output pwc engines...they ought to present it for publication. Such a tech item would be a first."
Doug
