Twinscrew wrote:As a matter of fact MOST of the folks who reply to what seems like nearly every other post on this forum are leaving this one alone. I wonder why. Where did everyone go?
Twinscrew wrote:Check out http://www.somender-singh.com/ It seems that the jury is still out on this one. Lots of folks claim they have noticed improvements but no dyno quantification yet. This thread has some limited info:http://speedtalk.com/forum/viewtopic.php?t=4069. These grooves were on the heads of a Mustang drag car in first place in it's class about four years ago. I was told that they only worked because of the fuel being used. I believe otherwise. You'll notice that out of all of the professional head designers and porters that post here, none are respoding to these topics. This leads me to believe there is something to it.
jacksoni wrote:...I think it has been pretty well covered til someone has new info/dyno numbers etc. Search "automotive breath" who posts here a lot and seems to have most experience....
cboggs wrote:Twinscrew wrote: This leads me to believe there is something to it.
Or nothing to it, . . .. ..
Stef wrote:Squish grooves/jets can be applied to either the cylinder head or piston. With the piston grooves/jets it's in engines that normally have a flat (no chamber) cylinder head like the Ford "Kent" I4 engine.
SAE paper 1999-01-3664 is a good example. There are other papers in the SAE/IMECHE/ASME jornals on this.
The above paper was in "Design of Racing and High-Performance Engines - 1998-2003" published by the SAE.
Unkl Ian wrote:Playing Devil's Advocate for a minute,the "benefit" of
these grooves may relate more to lower rpm than would
concern a pro stock or nascar engine builder.