Anybody done this?

At first I sorta freaked out when I saw them thinking it was just waiting to crack where they grooved the heads, but from what I have been reading people don't seem to have cracking problems.

I'm skeptical and wouldn't want to try this on an expensive set of heads but from what I have been reading there seems to be some merit to this.

They're called singh grooves

What he does is cut a groove in the quench zone and usually aims it at the plug, I guess it is supposed to be a flame channel and create a more even burn, better mileage, better ring seal, etc. They also claim you're supposed to run a squish of roughly .050-.070

Pic on somander singh's website





Here are a few links:
http://www.hotrodders.com/forum/sing...-a-102958.html

http://speedtalk.com/forum/viewtopic.php?t=3876

http://forums.turbobricks.com/showthread.php?t=66779

 

If you're ever at the beach, dig a trench with your heel in the sand near where the waves reach their highest. When the water retreats, it falls into that groove and rushes back. Where the returning water hits the water line it creates a lot of turbulence.

A flat quench area is like a book that you set down on the table. The air is forced out in a flat space. Cutting the grooves makes two points of intensified flow out of the quench area just like that channel in the sand. Its just a way to add more turbulence to the quench process.

 

Very popular in the Harley Davidson performance world right now. Not really a big power gain, but faster burn with less timing. Most are running a .030-.040 squish.

 

On the other SpeedTalk they were saying for the SBCs that .050-.055 seems to work better with the grooved heads than a tighter quench of .040 or so.

It seems like its mainly a fuel economy mod, but also makes a more even burn pattern and is supposed to improve low end slightly. Somewhere there was an idle clip with a car with a radical cam before and after grooved heads, it was interesting that the idle smoothed out with the grooved head.

 

[QUOTE=offroadrider12;4610336]On the other SpeedTalk they were saying for the SBCs that .050-.055 seems to work better with the grooved heads than a tighter quench of .040 or so.

It seems like its mainly a fuel economy mod, but also makes a more even burn pattern and is supposed to improve low end slightly. Somewhere there was an idle clip with a car with a radical cam before and after grooved heads, it was interesting that the idle smoothed out with the grooved head.[/QUOTE

I dont have them on my bike, so no first hand experience but have read alot of positives and no negatives. It certainly makes sense, in theory.

 

Cool, never even heard of this before!

 

I grooved the heads on my old 6.0l turbo motor. I wasn't very scientific with the process. But, I was able to add more timing and boost afterwards.

 

Isn't Harley Davidson Performance an oximoron like Jumbo Shrimp?

I haven't heard of the quench zone mod either but it does sound like it would help. Too bad hardcoreLS1.com is down. You might try searching on LS1Tech.

Rick