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Old 07-10-2008, 09:45 PM   #1
slowmike
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Default Somender Singh Grooves

Has anyone tried or had experience with Somender Singh Grooves in their Subaru heads?
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Old 07-11-2008, 12:31 AM   #2
Broxma
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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
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Old 07-11-2008, 12:44 AM   #3
reddevil
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Old 07-11-2008, 01:04 AM   #4
slowmike
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No one tried it on a Subaru?
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Old 07-11-2008, 02:32 AM   #5
SaabTuner
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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.
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Old 07-11-2008, 11:19 AM   #6
slowmike
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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.
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Old 07-11-2008, 09:09 AM   #7
bluescoobywagon
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It looks like a great way to add sharp edges to promote knock...
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Old 07-11-2008, 12:19 PM   #8
konmann
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Those slots in the heads look like they were made with a metal saw or abrasive type cut off wheel.
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Old 07-11-2008, 12:34 PM   #9
slowmike
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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.
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Old 07-12-2008, 01:41 AM   #10
blue05
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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.
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Old 07-12-2008, 08:51 PM   #11
slowmike
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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.
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