VWDiesel.net The IDI, TDI, and mTDI source.

Engine Specific Info and Questions => IDI Engine => Topic started by: arb on September 12, 2008, 10:38:20 am

Title: Piston grooves - Somender Singh Grooves
Post by: arb on September 12, 2008, 10:38:20 am

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

Title: Piston grooves - Somender Singh Grooves
Post by: mk2diesel on September 14, 2008, 05:15:48 pm

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

Title: Piston grooves - Somender Singh Grooves
Post by: arb on September 15, 2008, 09:01:41 am

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.

Title: Piston grooves - Somender Singh Grooves
Post by: Smokey Eddy on September 15, 2008, 12:56:21 pm

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

Title: Piston grooves - Somender Singh Grooves
Post by: silvertdi on September 16, 2008, 08:11:41 pm

This grooving thing sounds like a complete scam to me.