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1. kinda o/t engine question (score: 1): Author: Adam Bradley <ambradley@attbi.com>; Date: Fri, 21 Mar 2003 20:58:27 -0800; I'm having a Datsun J15 engine rebuilt for my PL411. It was already bored .020" over, and will be .030" (.75mm) when it's finished. I believe this means my bore will be 78.75mm instead of 78mm (stand; /html/datsun-roadsters/2003-03/msg00474.html (7,896 bytes)
2. RE: kinda o/t engine question (score: 1): Author: TCR2B@aol.com; Date: Sat, 22 Mar 2003 02:12:08 EST; A couple of things: New bore dia. = 78.762 mm 1mm=.03937in. .030/.03937=.762(mm) oversize Your displacement calculation appears to be correct: it was easier for me to figure it in inches and then co; /html/datsun-roadsters/2003-03/msg00476.html (7,997 bytes)
3. Re: kinda o/t engine question (score: 1): Author: Thomas - Sweden <csp311@telia.com>; Date: Sat, 22 Mar 2003 10:35:15 +0100; Compression ratio is the difference of the total volume in one cylinder between piston at bottom and piston at top. A 0.030" overbore (if the pistons have the same top as before) makes a very, very s; /html/datsun-roadsters/2003-03/msg00477.html (8,914 bytes)
4. kinda o/t engine question (score: 1): Author: "Andy Cost" <andycost@earthlink.net>; Date: Sat, 22 Mar 2003 09:01:19 -0600; higher /// datsun-roadsters@autox.team.net mailing list /// Archives at http://www.team.net/archive; /html/datsun-roadsters/2003-03/msg00479.html (7,503 bytes)
5. RE: kinda o/t engine question (score: 1): Author: "Brian Hollands" <Brian_Hollands@adp.com>; Date: Sat, 22 Mar 2003 10:35:15 -0500; Incorrect, Compression ratio is a function of swept volume (which increases when you bore the cylinders) to unswept volume (which is combustion chamber volume + cylinder volume at TDC + head gasket v; /html/datsun-roadsters/2003-03/msg00480.html (8,084 bytes)
6. RE: kinda o/t engine question (score: 1): Author: "Brian Hollands" <Brian_Hollands@adp.com>; Date: Sat, 22 Mar 2003 10:44:59 -0500; One couple of other points on this - Boring the cylinders can change CR by a couple tenths of a point easily so how significant a change it is depends on how close to detonation you are at present. A; /html/datsun-roadsters/2003-03/msg00481.html (8,193 bytes)
7. Re: kinda o/t engine question (score: 1): Author: Thomas - Sweden <csp311@telia.com>; Date: Sat, 22 Mar 2003 18:26:49 +0100; Yes. Example: 500 cc cylinder (swept volume) and 50 cc combustion chamber + gasket etc. (unswept volume) 500 cc + 50 cc / 50 cc = 11.0:1 CR Another example 500 cc + 60 cc / 60 cc = 9.33:1 CR And so o; /html/datsun-roadsters/2003-03/msg00483.html (7,698 bytes)

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