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Total 7 documents matching your query.

1. [TR] TR4A Piston Upgrade (score: 1): Author: Pat Caffrey <pcaffrey@deltacollege.edu>; Date: Sat, 6 Sep 2008 15:31:43 -0700 (PDT); I'm having an engine rebuild on my 1967 TR4A and am considering upgrading the pistons to either 87mm or 89mm. The car is strictly for street driving. I'd like to get more power out of the engine but; /html/triumphs/2008-09/msg00120.html (7,385 bytes)
2. Re: [TR] TR4A Piston Upgrade (score: 1): Author: "Andrew Uprichard" <auprichard@comcast.net>; Date: Sat, 6 Sep 2008 19:22:22 -0400; By too much you mean something downstream will fail as the result of the additional HP ? I put 89s in my TR3a with a slightly modified cam, but otherwise all is standard and I have had 4 years of tro; /html/triumphs/2008-09/msg00121.html (8,804 bytes)
3. Re: [TR] TR4A Piston Upgrade (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Sat, 6 Sep 2008 16:51:34 -0700; Wow, that's wild! How does the flow get related to the square of the cross-sectional area? Not so much. Displacement follows the square of the bore, but 89^2 is less than 5% more than 87^2; so we're; /html/triumphs/2008-09/msg00123.html (7,775 bytes)
4. Re: [TR] TR4A Piston Upgrade (score: 1): Author: "Andrew Uprichard" <auprichard@comcast.net>; Date: Sat, 6 Sep 2008 22:13:53 -0400; How come I knew you'd pick up on this ? I guess one answer is that the human body is a little more complicated than our beloved TRs, and flow to an organ also depends on cardiac output, blood pressu; /html/triumphs/2008-09/msg00133.html (9,052 bytes)
5. Re: [TR] TR4A Piston Upgrade (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Sat, 6 Sep 2008 20:29:10 -0700; Arnold was kind enough to send me the key phrase "Poiseuille's law". It's apparently pretty standard fluif dynamics. The key point of the derivation is that the fluid is viscous and sticks to the wa; /html/triumphs/2008-09/msg00134.html (7,861 bytes)
6. Re: [TR] TR4A Piston Upgrade (score: 1): Author: "Brian Induni" <308gtsi@roadrunner.com>; Date: Sat, 6 Sep 2008 23:24:10 -0700; Well, I did go with the 87mm upgrade when I rebuilt my 4a engine last year, but not sure it was worth the extra $$$. It is a bit self defeating - the larger the piston, the more mass; the more mass,; /html/triumphs/2008-09/msg00137.html (8,773 bytes)
7. Re: [TR] TR4A Piston Upgrade (score: 1): Author: MMoore8425@aol.com; Date: Sun, 7 Sep 2008 02:48:42 EDT; Brian, When I rebuilt my TRA several years ago, I bored to 90mm and had pistons made. THAT was a little pricey to. Wit a little bigger cam etc it scoots right along. I would probably not do it today; /html/triumphs/2008-09/msg00138.html (9,538 bytes)

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