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1. Re: [TR] [6pack] Compression boost (score: 1): Author: Michael Porter <mdporter@dfn.com>; Date: Fri, 13 Jun 2008 21:42:47 -0600; I think it depends upon how chamber preparation one does. Milling the head and just slapping it on will likely cause problems, if only because of the sharp edges from the milling. Attending to those,; /html/triumphs/2008-06/msg00269.html (7,736 bytes)
2. Re: [TR] [6pack] Compression boost (score: 1): Author: Robert Lang <lang@isis.mit.edu>; Date: Fri, 13 Jun 2008 23:52:30 -0400 (EDT); [stuff deleted] I'm not trying to "one-up" here, but a modern car with ALUMINUM HEADS and ENGINE MANAGEMENT has a few advantages over a cast iron engine with (likely) sub-optimal ignition timing (and; /html/triumphs/2008-06/msg00270.html (7,595 bytes)
3. Re: [TR] [6pack] Compression boost (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Fri, 13 Jun 2008 21:57:07 -0700; I don't recall the equation offhand, but the maximum torque of a car engine can be predicted reasonably accurately from just displacement and compression ratio. It follows that higher compression me; /html/triumphs/2008-06/msg00272.html (7,413 bytes)
4. Re: [TR] [6pack] Compression boost (score: 1): Author: Raymond Hatfield <iron_horse819@yahoo.com>; Date: Mon, 16 Jun 2008 05:43:56 -0700 (PDT); I plan on taking my TR engine up to 9.5:1 based on the fact that my Miata runs on regular with that compression ratio - it will ping a tiny bit under hard acceleration UNLESS I'm using E10 gasoline.; /html/triumphs/2008-06/msg00294.html (9,505 bytes)
5. Re: [TR] [6pack] Compression boost (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Mon, 16 Jun 2008 05:59:12 -0700; Well, don't be too surprised if it works out differently on your TR6. There's a lot more to octane requirement besides compression ratio; including combustion chamber shape and even head material (a; /html/triumphs/2008-06/msg00295.html (7,638 bytes)
6. Re: [TR] [6pack] Compression boost (score: 1): Author: emanteno@comcast.net; Date: Mon, 16 Jun 2008 14:50:06 +0000; You might also want to check to see if the Miata has a knock sensor. If it does, it senses pinging that the ear can't hear, and then retards the timing to eliminate the pinging. You certainly won't h; /html/triumphs/2008-06/msg00299.html (7,892 bytes)
7. Re: [TR] [6pack] Compression boost (score: 1): Author: Raymond Hatfield <iron_horse819@yahoo.com>; Date: Mon, 16 Jun 2008 10:06:45 -0700 (PDT); Good point Randall, and one that I'm trying to take into consideration. Obviously, no decision is final until the head gets milled! _______________________________________________ Support Team.Net ht; /html/triumphs/2008-06/msg00300.html (9,205 bytes)
8. Re: [TR] [6pack] Compression boost (score: 1): Author: Raymond Hatfield <iron_horse819@yahoo.com>; Date: Mon, 16 Jun 2008 10:09:06 -0700 (PDT); Maybe, and maybe not :) Since I'm planning on fuel-injecting the engine at some point, I have been considering adding a knock sensor to the engine. Obviously, I really need to sudy on how to make tha; /html/triumphs/2008-06/msg00301.html (9,157 bytes)
9. Re: [TR] [6pack] Compression boost (score: 1): Author: tom white <tswhitez123@hotmail.com>; Date: Tue, 17 Jun 2008 04:20:50 +0000; Before milling the head you might polish th combustion chambers and CC them. This will remove hot spots and balance the chambers. Best regards, Tom ___________________________________________________; /html/triumphs/2008-06/msg00315.html (8,246 bytes)
10. Re: [TR] [6pack] Compression boost (score: 1): Author: "wbeech" <wbeech@flash.net>; Date: Tue, 17 Jun 2008 00:17:54 -0600; Would anyone mind backing up a couple of steps just to explain how to determine the compression ratio? I know what it is, but do you fill the cylinder with liquid at BDC and measure how much come out; /html/triumphs/2008-06/msg00317.html (9,677 bytes)
11. Re: [TR] [6pack] Compression boost (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Tue, 17 Jun 2008 04:21:56 -0700; Ok, so you know compression ratio is (swept volume + unswept volume) / (unswept volume). Generally, I compute swept volume as (stroke * bore * bore * .7854). Your method would work, but it's easier; /html/triumphs/2008-06/msg00319.html (10,360 bytes)
12. Re: [TR] [6pack] Compression boost (score: 1): Author: Dave1massey@cs.com; Date: Tue, 17 Jun 2008 08:37:28 EDT; I seem to recall reading that knock sensors are far from trivial and that much signal processing and FFT's are required for effective implementation. If so, transplanting a knock sensor tuned for one; /html/triumphs/2008-06/msg00320.html (8,493 bytes)
13. Re: [TR] [6pack] Compression boost (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Tue, 17 Jun 2008 09:41:09 -0700; I've read much the same thing. Article I saw talked about the "knock signature" being different for every engine. Apparently they don't do the tuning in the sensor (which is basically just a microph; /html/triumphs/2008-06/msg00321.html (8,986 bytes)

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