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  #16 (permalink)  
Old 02-20-2003, 04:03 PM
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Oh hambiscuit, your just p!ssed because i called you on your BS story about 12:1 compression and a 671 blower. Im not a dick i just dont like seeing impressionable minds {loud malibu} filled with such garbage. And you dont port your combustion chamber, you clearence it to unshroud the valves. For gods sake i have never in my life heard of "porting the combustion chamber" polishing yes, but not porting. Oh im sorry, that must have been one of your old 1970 tricks to get your 12:1 671 blown 454 in the nines. The only 9 second run you probably ever made with that motor was initially starting it up for about 7 seconds and watching it blow for about 2. Biscuit your full of crap, and im done being negitive, end of story.

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  #17 (permalink)  
Old 02-20-2003, 06:00 PM
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Yeah I looked at that site and it says...
[quote]Five of these six tasks reduce restriction in the intake and exhaust tracts.
The remaining step, polishing the combustion chambers, inhibits carbon build-up,
decreasing an engine’s tendency to detonate or “knock” under heavy load. <hr></blockquote>

Exactly what you just said nickel. Polish combustion chamber only to inhibit carbon build-up.
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  #18 (permalink)  
Old 02-20-2003, 06:03 PM
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I noticed that you didn't quote the section & paragraph I refered to....can't stand to be wrong?
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Old 02-20-2003, 06:08 PM
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You can post it you know. So afr you are the only one with your opinion. Just copy and paste what you want. I read the page you sent me too and so did nickel I'm sure.
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Old 02-20-2003, 06:17 PM
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Ok I went back and found this...
[quote]Most important to remember during
chamber work is that you want to remove as little
material as possible. Every bit of metal you
polish away increases chamber displacement a
tiny bit and reduces your compression ratio a
corresponding amount. For that reason, you
must not use the rotary stone for chamber
polishing. <hr></blockquote>

To me that still says the point is to polish and remove as little as possible, EXCEPT if material must be removed for what it called 'shrouding' due to high valve lift in certain heads. Like I already stated, I'm no machinist and can only interpret what I've read and what I've been told in the past.
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Old 02-20-2003, 06:21 PM
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I've heard of unshrouding the valves. I'm not sure how much the chamber is enlarged though. $0.02
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Old 02-20-2003, 06:28 PM
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If you're only removing a minimal amount of material around the exhaust valve only (what it says) I can't see it affecting the compression all that much. It also says that this is usually done to pre '71 chevy heads if needed and early 289/302 Windsor heads.

Where's all our machinists? <img src="confused.gif" border="0">
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Old 02-20-2003, 06:33 PM
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Oh no Biscuit, please dont report me. Please, i swear ill agree to any BS story you post just dont report me. That private message you sent me was pathetic man, First off im not your typical definition of little by any standards, secondly im not going to Email battle you because that is rediculous, im simply stating your story is crap, and third by the time i was 15 i was more of a hotrodder than most guys, hey i built my first pontiac 400 by myself, i dont think that you know enough to be judging that. Im not judging your conquests cause i dont know you nor do i want to and i could care less, but i simply stated that 12:1 and a 671 blower is a BS story and you cant deny that. And you start crying to Dad "message board supervisor" because somone spoiled your story and spilled your milk. I tell it like it is, I dont candy coat stuff and if i dont know or im not really sure i typically keep my nose out of it and try to learn. Im probably one of the nicest guys youde ever meet till i smell BS. So instead of talking cyber crap grow a pair and throw in a good rebuttal,tell me exactly why i should believe you and then youll be somone ill listen to until then your full of it...oh yeah send me this article you sent Dmorris
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Old 02-20-2003, 06:37 PM
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[quote]And you start crying to Dad "message board supervisor" because somone spoiled your story and spilled your milk. <hr></blockquote>

So nickel, who's his dad??? What did he send you? The info was a website <a href="http://www.standardabrasives.com" target="_blank">www.standardabrasives.com</a> that he posted on page 1 of this.
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Old 02-20-2003, 06:52 PM
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Hey nickel, check your PM's.
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Old 02-20-2003, 06:54 PM
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<img src="confused.gif" border="0">
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Old 02-20-2003, 07:22 PM
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Hey B.S.cuit I just read your wonder article and you must have a warped perception of what it said Do you think you just start grinding combustion chambers to lower compression???, It says NOTHING about "porting" your combustion chamber, just polishing and maybe taking a hair out to unshroud the valve, they quote somthing like..." Dont get carried away or you will alter your compression ratio" This if done properly would barely reduce your compression, it would litlerally be unnoticeable and surely wouldnt be the deciding factor between detonation and not detonating, for crying out loud man were talking about a half a CC probably so get off your high horse the polishing is what would reduce chances of detonation be removing potential hot spots but thats not "porting the combustion chamber"...youre wrong and YOUR OWN ARTICLE PROVED IT.

[ February 20, 2003: Message edited by: nickel333 ]</p>
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  #28 (permalink)  
Old 02-20-2003, 08:48 PM
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Chamber polishing will increase chamber volume somewhere between 3-7 cc's depending on bore and surface roughness and how hard you lean on the grinder.

You guys do the math.

Polishing the chamber to reduce carbon buildup is an old wife's tale, it still builds up no matter what you do. Oh, and doing it to reflect heat back into the chamber is another one I like to hear.
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