Singh Grooves

[an0nymous]

Looks like it made slightly more torque in the usable rpms....
I notice that the test groove represent a much smaller % of the surface area than the multiple grooves per cylinder shown in the metro buildup pics. I wonder if they went as far as they should have?

[Xist]

Originally Posted by i_am_socket

HERE'S THE ARTICLE

And it's from September 2004.

I read this article eight years ago and just tracked it down. For some reason it cuts off. This page has the rest of the article:

Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Singh Grooves

[Xist]

I found several websites where people are trying this on their vehicle, but like the Jeremah in the original post, all improvements are antecdotal.

[ConnClark]

Belongs in the Unicorn corral IMHO

[Xist]

I do not think that unicorns would appreciate you putting dimples on them.

[mwebb]

do singh grooves improve FE / BSFC in a Geo Metro 10G
yes
do they improve power output ?
no

67 pages of test description and test results

http://somender-singh.com/uploadfile...s_Analysis.pdf

not going to work in a 4 valve per cylinder head
or
a 5 valve per cylinder head

[niky]

Been hearing about Singh grooves for years, and that's the first comprehensive test I've seen.

[Xist]

The guy that posted the link I shared earlier also ranted about that test. I usually ignore people who rant. I just remember he said that the test was worthless because they used the wrong cell. They did mention several times that the cell was a limiting factor, but it would have been prohibitively expensive.

I did not see an overall conclusion, just many tables and summaries after each series of tests. They certainly seemed thorough. I also do not remember anything about three valves compared to four or five. Did they say why it would not work.

What was the difference they showed in MPG and HP?

[Tamn]

Why is this not in the unicorn corral? It's unproven and totally speculation.

[niky]

Singh himself went to the trouble of having his modifications tested when he started out... But verification from Singh groove users is hard to find, especially as not many bother to really test them properly.

Always thought this was Unicorn stuff, myself, and probably not compatible with more modern multi-valve cars... Especially if you can't eliminate the effects of ECU relearning like these guys did by using a MegaSquirt.

Originally Posted by Xist

I did not see an overall conclusion, just many tables and summaries after each series of tests. They certainly seemed thorough.

The summary is before the tables. Lower fuel consumption and cooler operation in most conditions. I wonder, though, if it would have been better to do a "before" test for both engines... just to eliminate the effects of manufacturing variances which might cause one engine to naturally run better. But the preparation of the engines sounds pretty good, if they're telling e true, and they were pretty thorough, otherwise.

Strange that the wideband shows less oxygen in the exhaust and that the engine runs cooler even with less fuel being injected. Does the groove promote better burn by pushing the air towards the plug as the cylinder goes up?