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1. [6pack] Compression boost (score: 1): Author: "Alan Salvatore" <tr6parts@charter.net>; Date: Fri, 13 Jun 2008 22:56:27 -0400; I am in the process of rebuilding my 76 motor. I had it bored out 20 over and got a G2 cam, aluminum flywheel. I couldn't decide what to do with the head. I just left it at the machine shop and am go; /html/6pack/2008-06/msg00087.html (7,336 bytes)
2. Re: [6pack] Compression boost (score: 1): Author: Richard Seaton <rsh17@msn.com>; Date: Fri, 13 Jun 2008 22:04:50 -0500; I have a similar cam (Piper 270) and 9.5:1 and run 93 oct, no problems, not sure about 87 or 89 as I've never run the lower octane in it. Never a hicup w/ 93, so I assume 89 might not be too bad. 3-; /html/6pack/2008-06/msg00088.html (7,441 bytes)
3. Re: [6pack] Compression boost (score: 1): Author: "Foster, Stan" <stan.foster@hp.com>; Date: Sat, 14 Jun 2008 03:08:44 +0000; My understanding is that you can go at least as high as 9.5:1 or perhaps 9.6:1 and still be fine on regular gas. At least I hope so, I had my head and block machined for 9.6:1 based on that assumptio; /html/6pack/2008-06/msg00089.html (7,524 bytes)
4. Re: [6pack] Compression boost (score: 1): Author: "Alan Salvatore" <tr6parts@charter.net>; Date: Fri, 13 Jun 2008 23:25:08 -0400; I wonder how much difference there is between 9.5 and 9.0 compression. I could bump it up. As a daily driver, I prefer not to have to run premium. Al My understanding is that you can go at least as h; /html/6pack/2008-06/msg00090.html (8,528 bytes)
5. Re: [6pack] Compression boost (score: 1): Author: Robert Lang <lang@isis.mit.edu>; Date: Fri, 13 Jun 2008 23:32:29 -0400 (EDT); Once you get above 9.5:1, you can run regular or mid-grade fuel, but you have to watch for pinging and if you get ping, you have to back off the timing. Note that the higher the compression ratio, t; /html/6pack/2008-06/msg00091.html (8,672 bytes)
6. Re: [6pack] Compression boost (score: 1): Author: Kendall Larsen <mailkendall@sbcglobal.net>; Date: Fri, 13 Jun 2008 22:19:27 -0700 (PDT); For what it's worth on the economics of premium... Regular: $4.53/gal Premium: $4.71/gal 10,000 miles a year 18 mpg 556 gal/year Totals: Regular $2,517 Premium $2,617 Or a difference of $100/yr Or 4%; /html/6pack/2008-06/msg00092.html (8,966 bytes)
7. Re: [6pack] Compression boost (score: 1): Author: "Sally or Dick Taylor" <tr6taylor@webtv.net>; Date: Sat, 14 Jun 2008 06:35:42 GMT; Al--You could try the 87 Octane with the 9:1 CR, but expect to retard your ignition timing a few degrees, depending on where you now have it, of course. I'd guess you could end up with the timing at; /html/6pack/2008-06/msg00093.html (8,571 bytes)
8. Re: [6pack] Compression boost (score: 1): Author: "Joseph Grant" <grant@bowtie6.com>; Date: Mon, 16 Jun 2008 12:49:22 -0400; This whole thread about compression ratios is quite interesting. I have several questions for you all: You talk about increasing the ratios to 9.0, 9.5, etc. Given head 'x', how is the compression ra; /html/6pack/2008-06/msg00113.html (8,459 bytes)
9. Re: [6pack] Compression boost (score: 1): Author: Kendall Larsen <mailkendall@sbcglobal.net>; Date: Mon, 16 Jun 2008 10:12:37 -0700 (PDT); I found this guy on youtube that talks through how compression ratio is calculated by "cc'ing" the head. (Filling it with fluid to measure volume) http://www.youtube.com/watch?v=OGuOMItsCXk Kendall S; /html/6pack/2008-06/msg00115.html (8,409 bytes)
10. Re: [6pack] Compression boost (score: 1): Author: Jeff Scarbrough <fishplate@charter.net>; Date: Mon, 16 Jun 2008 18:11:42 -0400; Yes, but doesn't your Miata have a knock sensor that retards the timing upon detecting a ping? _______________________________________________ Support Team.Net http://www.team.net/donate.html 6pack@a; /html/6pack/2008-06/msg00124.html (7,993 bytes)
11. Re: [6pack] Compression boost (score: 1): Author: "Navarrette, Vance" <vance.navarrette@intel.com>; Date: Thu, 19 Jun 2008 08:44:49 -0700; I am coming to this discussion very late, but a data point is that I run 9.6:1 CR, with a 270 degree cam on regular (87 octane R+M/2), never the slightest hint of pinging. I run the factory timing o; /html/6pack/2008-06/msg00145.html (10,076 bytes)
12. Re: [6pack] Compression boost (score: 1): Author: FSZEK@aol.com; Date: Thu, 19 Jun 2008 19:31:37 EDT; Hey Vance, What kind of mileage do you get ? Enviously, Frank,in Ohio **Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. (http://autos.aol.com/used?ncid=aolaut0005000000000; /html/6pack/2008-06/msg00150.html (8,134 bytes)

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