Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 07-10-2008, 09:45 PM   #1
slowmike
Scooby Specialist
 
Member#: 24890
Join Date: Sep 2002
Chapter/Region: SCIC
Location: All I wanted was a Pepsi
Vehicle:
2002 Jackwagon
WRB GG

Default Somender Singh Grooves

Has anyone tried or had experience with Somender Singh Grooves in their Subaru heads?
* Registered users of the site do not see these ads.
slowmike is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-11-2008, 12:31 AM   #2
Broxma
Scooby Specialist
 
Member#: 158006
Join Date: Aug 2007
Chapter/Region: TXIC
Location: San Antonio
Vehicle:
2003 WRX IdleWagon
1992 GVR4 379/1000

Default

Looking at the WRX heads I have sitting next to me it certainly is possible to do, but just a slight bit of research showed little to no change, negative torque numbers, or comparisons being made under different conditions, i.e. the only change was the grooves and "light port job".

Squish and flamefront action has been studied to death for almost 100 years in the relatively modern combustion engine. I know improvements could be made to most factory heads, but it would seem that manufacturers taking an extra 30 seconds to change the cast of the head to include these miracle notches with the promises made by the "inventor" would be a foregone conclusion, yet, they don't. If there was a true petrol powered vehicle on the road that from the factory came with these grooves and was considerably more efficient in the MPG department, i'd look further into it.

I am always leary of any miracle which is touted as "Patented" since you can patent just about anything, working or not. And from testimonials at Turbobrick and various other auto forums, the most notable improvement with the grooves cut was "Improved idle" and "Different sound". I'm not sold on the idea and even with my heads off my car and about ready to go back on, would not be willing to try it.

/Brox
Broxma is offline   Reply With Quote
Old 07-11-2008, 12:44 AM   #3
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

reddevil is offline   Reply With Quote
Old 07-11-2008, 01:04 AM   #4
slowmike
Scooby Specialist
 
Member#: 24890
Join Date: Sep 2002
Chapter/Region: SCIC
Location: All I wanted was a Pepsi
Vehicle:
2002 Jackwagon
WRB GG

Default

No one tried it on a Subaru?
slowmike is offline   Reply With Quote
Old 07-11-2008, 02:32 AM   #5
SaabTuner
Scooby Specialist
 
Member#: 67608
Join Date: Aug 2004
Location: SoCal
Default

There's no point. The boundary layer of air is thicker than the depth of those grooves.

If it weren't, your aluminum heads would melt under the 3,000+*C combustion temperatures.
SaabTuner is offline   Reply With Quote
Old 07-11-2008, 09:09 AM   #6
bluescoobywagon
Scooby Specialist
 
Member#: 14911
Join Date: Feb 2002
Chapter/Region: MWSOC
Location: The land of E85
Vehicle:
Not A Wagon!
2011 WRX - 285s on 18x9.5

Default

It looks like a great way to add sharp edges to promote knock...
bluescoobywagon is offline   Reply With Quote
Old 07-11-2008, 11:19 AM   #7
slowmike
Scooby Specialist
 
Member#: 24890
Join Date: Sep 2002
Chapter/Region: SCIC
Location: All I wanted was a Pepsi
Vehicle:
2002 Jackwagon
WRB GG

Default

Quote:
Originally Posted by SaabTuner View Post
There's no point. The boundary layer of air is thicker than the depth of those grooves.

If it weren't, your aluminum heads would melt under the 3,000+*C combustion temperatures.
You make a good point. I was just surprised that no one on nasioc had tried this yet in our never ending quest for knock resistance.
slowmike is offline   Reply With Quote
Old 07-11-2008, 12:19 PM   #8
konmann
Scooby Newbie
 
Member#: 125466
Join Date: Sep 2006
Chapter/Region: Tri-State
Location: Hudson Valley
Vehicle:
2006 WRX TR
SGM

Default

Those slots in the heads look like they were made with a metal saw or abrasive type cut off wheel.
konmann is offline   Reply With Quote
Old 07-11-2008, 12:34 PM   #9
slowmike
Scooby Specialist
 
Member#: 24890
Join Date: Sep 2002
Chapter/Region: SCIC
Location: All I wanted was a Pepsi
Vehicle:
2002 Jackwagon
WRB GG

Default

Some of the examples I have found are done with a mill and others are done by hand. I haven't found any Subaru examples yet and only a couple of vague turbo applications that didn't offer much info.
slowmike is offline   Reply With Quote
Old 07-12-2008, 01:41 AM   #10
blue05
Scooby Newbie
 
Member#: 125144
Join Date: Sep 2006
Chapter/Region: SCIC
Location: SoCal, LA that is.
Vehicle:
2005 wrx STi
wrb

Default

There is not a squish area on our heads. They are basically hemi heads. Plus we also have dished pistons. If we had flat top pistons and a matching flat spot opposite the plug those grooves might do something. All those pics were of sb chevys and fords.
blue05 is offline   Reply With Quote
Old 07-12-2008, 08:51 PM   #11
slowmike
Scooby Specialist
 
Member#: 24890
Join Date: Sep 2002
Chapter/Region: SCIC
Location: All I wanted was a Pepsi
Vehicle:
2002 Jackwagon
WRB GG

Default

Quote:
Originally Posted by blue05 View Post
There is not a squish area on our heads. They are basically hemi heads. Plus we also have dished pistons. If we had flat top pistons and a matching flat spot opposite the plug those grooves might do something. All those pics were of sb chevys and fords.
Subarus have a pent roof combustion chamber with a quench pad above the intake valves and one below the exhaust valves. When you put EJ205 heads on an EJ257 block, those quench areas become much bigger and you get quench area around the whole perimeter of the combustion chamber because of the smaller chamber size of the EJ205 head. This interests me because I am in the process of building a hybrid.
slowmike is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Singh Subaru of Riverside, CA AphexDouble Dealership Reviews 7 02-27-2010 07:19 PM
Singh Subaru in Riverside, CA GordonLai Newbies & FAQs 0 09-05-2009 07:48 PM
Tarsem Singh poison Off-Topic 10 08-19-2009 12:23 PM
Damn Vijay Singh wcbjr Off-Topic 24 09-04-2006 06:33 PM
Vijay Singh disses Annika Sorenstam and then gets completely OWN by his wife. Snoopy Off-Topic 93 05-26-2003 01:52 AM

All times are GMT -4. The time now is 04:26 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.