I heard about this when I was in India in 1999. I thought it was ghetto back then but its really catching on.

Any thoughts?

http://www.herningg.com/projects/groovyheads.html

http://somender-singh.com/content/view/7/31/

http://somender-singh.com/content/view/68/49/

http://fueleconomytips.com/index.php...id=73&Itemid=2

http://jeremiahsviolins.com/grooves.htm

 

It helps burn efficiency(hense power and knock) - when the piston comes to TDC, that groove creates a high pressure surge of air into the quench area that helps ditribute the mixture in the combustion chamber. < - Cliff Notes. You should see the burn pattern in the chambers and piston tops that come out of motors set up that way - looks perfect.

 

Pretty interesting but wouldn't positioning of the groove be critical for best performance. It just seems to half hazard to me that a guy is breaking out his dremel tool to do this.

 

I think the groove has to be cut across from the spark plug.

 

If increasing turbulence is better, why do people port & polish?

 

Turbulant flow as apposed to a smooth laminar flow will cause air to "stick" to the surface. Thats why on a good port and polish job you actually try to scuff up the intake side a little. Example a golf ball flying through the air.



Maybe i will try this on my jet ski for fun. Head comes off pretty easily and that 2 cycle could def use a better burn pattern

 

But doesn't turbulent flow slow or lower the amt. of air traveling through a port as opposed to a slick smooth port?

 

I think most understand this but I'm going to say it anyway for people running out to rip there heads off and perform the surgery.
I hope anyone reading this understands not to go past the inside edge of the head gasket....otherwise you will have issues.

 

You want turbulance on the intake side so the fuel atomizes better and you polish the hell out of hte exhaust side.

 

Someone had to say it. I'm sure you saved at least one 16 yr old kid from messing up his car.

 

You completely missed the point, this is done in the chamber for turbulence under compression, not impacting port flow. In theory the turbulence at the top of the compression stroke mixes the air and fuel better and helps the flame front travel.

Far as polishing most of the time that is done it is because the person didn't know what they were doing and mistakenly thought it benificial.
I don't even buy the polish the exhaust port leave it a tad rough so carbon can stick and insulate the head a mlittle from the exhaust gas heat. If the motor is running right the carbon will not accumulate to the point of any restriction.

 

The groove is to push the fuel mixture out of the quench area into the combustion pocket closer to the plug, for a more complete burn. In tests there have been no HP gains,just fuel mileage gains. It may help detonation but that has not been proven either. Right now it is just an experiment.

Don't know about everybody else but I want the quickest ET not the least amount of fuel burned in a pass. Do they give trophies for that.

There is a guy down here cutting 4 grooves across the quench area. He has also done radial grooves,but their car didn't gain any measurable ET/MPH.

 

These guys are documenting gains. I have no idea about lowered et's etc...

 

They also went from 9.0 to 10.2 compression ratio. I was told sharp edges result in hot spots and possible pinging. Would these grooves not count as such?

 

Cutting steps into the backside of each valve to help with fuel atomization was a pretty clever idea.