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Old 08-23-2006, 03:46 PM   #1
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Grooves in the squish area of the combustion chamber

http://www.jeremiahsviolins.com/grooves.htm

Anyone done this?

I'm curious. I would love to do this but my car is too nice.
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Old 08-23-2006, 03:58 PM   #2
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Ah, I posted about this way back when when it was new, who knows, not me. Someone more clever will have to come along and see. I believe Larry is having this done on his saturn.

However, it might be worth noting that Hondas don't really have quench spaces, at least not D, B, H, or F series Hondas. I haven't seen a K or L taken apart that I know of but I don't they changed their basic head casting.
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Old 08-23-2006, 08:52 PM   #3
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This person is a regular contributor at teamswift in the FE forum. I haven't talked to him about this though. What's the supposed mechanism that helps FE?

He mentions the grooves helped reduce ping, which he got by going with a shaved head / increased compression ratio. But, isn't taking material out of the combustion chamber simply reducing the compression ratio again?

I admit this one's beyond me.
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Old 08-23-2006, 09:55 PM   #4
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the idea of the grooves I think is they help to chanal the flame to the outer edges to help with a faster more compleat burn, and altho the groves will help to reduce compression I doubt, unless he bearly touched the head when he shaved it, that those tiny notches have no way of making up that much volume.
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Old 08-23-2006, 10:29 PM   #5
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Originally Posted by the article
I can idle it while driving in 2nd gear below 500 rpm
How does one idle while in 2nd gear?
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Old 08-23-2006, 10:38 PM   #6
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So I guess I'd like to see a better test before I get out the grinder and carbide bit.
You're more adverterous than I. I'd prefer to have a spare cylinder head before I did this one.
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Old 08-23-2006, 11:18 PM   #7
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Dude, I'd throw a few bucks your way just to have a reliable test done on this ish.
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Old 08-24-2006, 04:33 AM   #8
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I've already started to go nuts with porting, valve relieving, and chamber cc'ing. Would consider these if there was a better basis for doing so.
Check out www.mpgresearch.com

...you can also find links to other sites...a lot of people doing the groove thing with some good results.
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Old 08-24-2006, 10:14 AM   #9
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Dude, I'd throw a few bucks your way just to have a reliable test done on this ish.
well, how much is a few? because i would love to see a real test done just to have a REAL test done. if a handfull of us pitched in $20each, and a junkyard run ensued??
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Old 08-24-2006, 10:28 AM   #10
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well, how much is a few? because i would love to see a real test done just to have a REAL test done. if a handfull of us pitched in $20each, and a junkyard run ensued??
For something like this, I think it would be better to use a junk car on it's way out. I believe I remember reading about certain auto manufacturers trying to do this on their engines, but they found it was too difficult to do correctly, so they abandoned the modification.
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