Originally Posted by automotive breath

Curtis is absolutely right, I did a test, lets call it privative wet flow. I put a gasket on a grooved head and placed a piece of plexi glass with a hole in it over the squish area. With a low pressure parts washer, I blew solvent into the hole; some of the solvent blew out of the squish window, the rest exited out of the groove in a stream. I concluded, with this groove as a guide, you can decide where you want the concentrated squish to flow. Now I cut them in many directions trying to decide what works best.

I've been doing this for over two years, at first with the direction of Somender Singh. Some folk’s say this won't work, I have never heard that from someone that has tried it!

Originally Posted by xntrik

Thanks for the update. After lots of studying, I am totally convinced they work. And will be using them on my new SBF heads.
x

Originally Posted by rale

do the grooves have to be straight or can they be at angels or curved?

Does it mater how many grooves there are??

Would it make a difference if the spark plug is lined up with the grooves wild that make a difference??

Originally Posted by Rob

… Spark ignition (SI) engines all work on the principle of a turbulent flame front (TFF) consuming the air-fuel charge. A normal combustion event would be considered one where the spark ignites the air fuel mixture (a complex process in itself) and the flame propagates throughout the air-fuel mixture with this turbulent flame front.

First, think of a chamber (say a cube or a disc for simplicity) full of nice calm, still air-fuel mixture. A spark in the middle ignites, and begins to consume the mixture. Ideally, the flame front (in this case a laminar flame front, since the mixture is still) would form a spherical shell, as it progresses. Now, this flame front is propelled by a couple of forces. First, the mixture in the wake of the flame front is obviously heated by the combustion. This heat translates to an increase in pressure. This higher pressure burned gas compresses the mixture ahead of the flame front. Since the volume of the burned gases expands it helps accelerate the flame front. Think of blowing up a balloon. The compression of the end gas also raises its temperature. Flame speeds are higher in higher temperature mixtures.

For a turbulent flame front, consider instead of a calm chamber, a chamber full of turbulent eddies, of all size scales. As the flame front approaches one of these swirling eddies, the flame edge is 'torn' and spun around by the eddy, into fresh mixture. This helps to shred up the flame front, and helps to progress the burn of the mixture. In short, this is really why SI engines work at all…

Originally Posted by bullheimer

yo. can't believe this thread ended after less than two pages. anyway.
auto breath, why are the groove in your pic above coming from the exhaust valve? how did this work in comparison to coming from the spark plug and how did the multiple lines work compared to the single?

this is a great idea to me and my 400 pontiac because i am at .032 down in the hole and with a .039 gasket would be right at 71 down so perfect for this groove-thang!!! i have been planning on zero decking.

Originally Posted by bullheimer

auto B, you just told me to angle the grooves towards the intake valves. those would be the LARGE ones. all of your pictures show the lines headed towards the smaller exhaust valve. also, with a 26 thou gasket and 32 down i would be only at 58 quench, far from the 70-90 referred to earlier.