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1. 30 over displacement in cc (score: 1): Author: Unknown; Date: Mon, 25 Aug 2003 20:23:47 -0400; Hey All, What is the displacement of a 1275cc engine after it's bored 30 over? Kevin V. /// unsubscribe/change address requests to majordomo@autox.team.net or try /// http://www.team.net/mailman/list; /html/spridgets/2003-08/msg01007.html (7,376 bytes)
2. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Mon, 25 Aug 2003 19:58:11 -0700; Well, I believe .060 over is 1330, but to be accurate, there are a lot of variables. Is is the head shaved (smaller combustion chamber); is the block decked? What pistons, etc. Thanks for the vote of; /html/spridgets/2003-08/msg01016.html (8,538 bytes)
3. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Mon, 25 Aug 2003 23:28:16 -0700; OK, before I get deluged with emails, I stand corrected. I mixed up CR with displacement. The answer to Kent's original question is 1301. I'll be putting the formula on my web site for future referen; /html/spridgets/2003-08/msg01022.html (7,869 bytes)
4. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Tue, 26 Aug 2003 03:35:35 -0400 FILETIME=[9C2317E0:01C36BA4]; According to the Autopress Ltd. book, the 1275's bore/stroke = 70.61/81.28mm Converting these to inches = 2.77992126"/3.2" Displacement = (pi*bore^2/4)*stroke*# of cyl so: pi*2.77992126"^2/4 = 6.0695; /html/spridgets/2003-08/msg01024.html (7,923 bytes)
5. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Tue, 26 Aug 2003 04:15:43 -0400 FILETIME=[371C74D0:01C36BAA]; Thanks! Spreadsheets are Beautiful Things. ;^) GM -- Original Message -- From "Robert E. Shlafer" <PilotRob at webtv.net> To: "GM" <altec210@yahoo.com> Cc: <spridgets@autox.team.net> Sent: Tuesday, A; /html/spridgets/2003-08/msg01029.html (7,893 bytes)
6. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Tue, 26 Aug 2003 04:31:45 EDT; The point may be academic at least for A-series engines since there may not be pistons available in that size. Standard overbore sizes being 20, 40 & 60 Daniel1312 /// unsubscribe/change address requ; /html/spridgets/2003-08/msg01030.html (7,321 bytes)
7. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Tue, 26 Aug 2003 06:12:59 -0700 (PDT); I answered Kevin directly (BTW, .040 over is 1312, Pilot). I should have posted the math to the list. Head chambers, etc., affect compression ratio, but the displacement is simply how much air (volum; /html/spridgets/2003-08/msg01033.html (7,829 bytes)
8. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Tue, 26 Aug 2003 17:34:27 -0400; Pistons are (or were) available in 30 over. I got a set from Peter C. (in the spring of this year). The block is bored and all the machine work has been done to the crankshaft, rods and head. All I; /html/spridgets/2003-08/msg01046.html (8,126 bytes)
9. Re: 30 over displacement in cc (score: 1): Author: Unknown; Date: Wed, 27 Aug 2003 01:45:00 -0400 FILETIME=[48E504C0:01C36C5E]; Well, unless they're a heck of a lot better made than they were ~30yrs ago, they're going to have to be custom anyway, and assuming sizing hasn't changed since then they are 'standard' in 0.005" incr; /html/spridgets/2003-08/msg01063.html (8,084 bytes)

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