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Head mods |
I've never seen that before. Does it promote swirl or possibly reduce overlap flow to the exhaust by creating a disturbance in the path?:confused: Found some info here (back a few clicks from the pics): http://www.somender-singh.com/ |
wow, definately sounds too good to be true. good timing for me though, i've got a .070" quench distance and 10.3:1 ratio or so, porting the heads now.... hmm.... |
What exactly does this slot do? I'll be putting on a set of heads in the next couple of months and I'm wondering if this might be worth doing before I put them on? |
placement of one or more grooves or channels or passages in the squish area as shown & described in the first page of US Patent 6237579 results in "Accelerated Laminar Total Clean Burn Combustion " - ALTCBC ? Meaning to say this simple but radical design change to squish areas, configurations enhances progressive turbulence close to the skin of the combustion chamber and further directs the (added) turbulence towards the igniter followed by multiple flame front propagation thus resulting in a radical change to " In-cylinder Combustion ". ALTCBC improves " Torque & Power " through the entire operating range with lesser amounts of fuel. After this simple design change - Obsolete Side Valve engines which feature large quench areas - when fully loaded to the max at 2000 rpms on a dyno have shown a reduction of 42.5 % fuel consumption ( BSFC) and further producing more torque & power at lower operating temperatures in comparison to a stock engine. ( ARAI results ) |
Originally posted by 84z28350 Looks and sounds cool but wouldnt the edges create hot spots and cause crazy detonation, especially in 2-strokes... Maybe it creates hot spots to help burn all of the fuel in the cylinder? Can anyone explain the theory behind this? I read the article, but I didnt see anything scientific, just a bunch of, "Use 40% less fuel and increase torque". Theories. Must be like that 4/7 swap theory. |
It looks like someone just used a grinder with a cut-off blade to make them... The only way i would do something like this is on a old set of junk heads, which i have 2 pairs so i may give it a try and see how bad it goes KABOOM! :p |
Did a quick patent search, found it here. http://patft.uspto.gov/netacgi/nph-P...&RS=PN/6237579 Hope the link work :) |
How do you patent a groove made by a grinder? I guess it would prevent a company from selling heads with this groove pre-cut. I'd love to try this, but would hate to ruin a set of heads that I cant afford to replace. anyone have a spare set of 416's and a dyno? |
What it seems to me like it would do, is that after the intake valve closes and the piston is coming back up, when it gets near the top, the gasses compressed under the 'flat' part of the head will collect in the groove and 'shoot' down the channel at a pretty good speed right into the middle of the combustion chamber. If this is actually what happens, then that would in theory create alot of turbulence just before the plug fires, or just as it is firing. |
Originally posted by Air_Adam What it seems to me like it would do, is that after the intake valve closes and the piston is coming back up, when it gets near the top, the gasses compressed under the 'flat' part of the head will collect in the groove and 'shoot' down the channel at a pretty good speed right into the middle of the combustion chamber. If this is actually what happens, then that would in theory create alot of turbulence just before the plug fires, or just as it is firing. |
Originally posted by 88_Import_Slaye Test it out for us. :p EDIT - wow... I wasn't serious guys!:eek: |
This is not as easy as it looks! The channels have to be strategically placed, certain sizes (depths, width, length) will all effect the velocity, and whether or not it will be doing what it's meant for, or if it's just going to kill velocity all together! If you have never ported heads before do NOT try this until you have a GOOD grasp of how things flow from the intake valve into the exhaust chamber, and once it's there, how your particular piston reacts with that. If you ever use the heads that you "channeled" on another engine, then you'll need to make sure you use the same pistons, or you'll have to modify the pistons that are in there in order to get the air to flow in the right direction. The way he makes it sound is easy... to bad it's not or I would be doing it... |
I got some 416 and 882s their still on motors at the moment though, theirs also no dynos around here... |
How would you judge the benifit/gains ??? If i would have seen this a few weeks ago, and could "see" the diagrams I might have tried it. The concept sounds reasonable although I'm sure there is a bit of figuring on the slot width, depth and taper to the correct points. Lot of small dynamics going on there concerning the shape of the chamber. Fresh heads are already bolted on so its not happening here. I do have a set of 083's that I might try on a future project if it seems to be viable. still reading... |
Originally posted by sellmanb This is not as easy as it looks! The channels have to be strategically placed, certain sizes (depths, width, length) will all effect the velocity, and whether or not it will be doing what it's meant for, or if it's just going to kill velocity all together! If you have never ported heads before do NOT try this until you have a GOOD grasp of how things flow from the intake valve into the exhaust chamber, and once it's there, how your particular piston reacts with that. If you ever use the heads that you "channeled" on another engine, then you'll need to make sure you use the same pistons, or you'll have to modify the pistons that are in there in order to get the air to flow in the right direction. The way he makes it sound is easy... to bad it's not or I would be doing it... |
Originally posted by 88_Import_Slaye no more prep'n my grinder for modding tonight :D From Pop Sci mag: Even as a prototype, it’s high-concept but exceptionally low-tech, the sort of thing you might be able to make in your own garage with a steady hand and a Dremel tool. Which is, essentially, what Singh did. “I am no great genius man, no man with letters after his name or fancy institutions, and what I have invented is really very simple,” he admits, as he pushes aside the clutter to reveal a child’s chalkboard. “But to understand even so simple a concept, you first must have a basic understanding of the forces at work within the combustion cylinder, the concept of turbulence and combustion which define the engine.” Singh takes the chalk and draws a rectangle with a domed top: a combustion chamber and the cylinder head, the ashtraylike piece of metal he has modified. Then he draws a diagonal line across the edge of that dome, then another, representing the grooves he has carved—his invention. The grooves are supposed to better mix the air and fuel inside the chamber. Singh is convinced that it makes combustion more efficient. Lot of info out there on this. Maybe the guy is just thinking while everyone else is calculating. Found patent pics here with the text. http://pesn.com/2005/10/13/9600187_D...tion_Chambers/ |
Interesting stuff |
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