Piston grooves - Somender Singh Grooves

[arb]

Has anyone done grooves in the head / pistion crowns to improve combustion ? I've seen quite a bit about this in the gasser world, but nothing in ours.

http://somender-singh.com

[mk2diesel]

we don't have squish bands over our pistons .. the grooves would lower the compression ratio .. cause hard starting ... and burn up the pistons at higher speeds ( less mass to dissipate the heat produced under heavy load )..with  higher internal temps  ...
1.6 have swirl chambers already  .. 1.9 have them built into the pistons

[arb]

I would think the squash band was directly under the pre-chamber cup.  Yes, the 23:1 would drop to maybe 22:1 but an extra pound or 2 of boost would more than make up for that. Cold starts w/ slightly less compression - pull the cold start lever most of us never use.

The guys on the Groove sites have been having great sucess, but none of them are diesel heads.

[Smokey Eddy]

I have to use my cold start to keep mine idling on more than 2 cylinders once started  :cry:

[silvertdi]

This grooving thing sounds like a complete scam to me.