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1. [Land-speed] Destroking a Crankshaft... (score: 1): Author: Larry Mayfield <drmayf@mayfco.com>; Date: Sun, 20 Feb 2011 10:34:05 -0800; I have been toying around with an idea for a new motor for my Sunbeam. But it would require a destroked crank to meet the displacement goals. I have been searching around for such cranks and they are; /html/land-speed/2011-02/msg00027.html (8,075 bytes)
2. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Jon Wennerberg <jonwennerberg@nancyandjon.org>; Date: Sun, 20 Feb 2011 15:22:03 -0500; I had a built-up/welded up stroker crank made for my nitrous bike -- and it didn't last well at all. I heard poor things about the welded up process after going that way. It wasn't a huge increase in; /html/land-speed/2011-02/msg00028.html (8,733 bytes)
3. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: <sparky.2211@cox.net>; Date: Sun, 20 Feb 2011 20:51:16 -0500; I would just pull push rods and put dummy lifters to keep up oil presure and plug wires out of ever how many cyl you need to get to displacement _______________________________________________ Land-s; /html/land-speed/2011-02/msg00029.html (8,290 bytes)
4. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Bryan Savage <b.a.savage@wildblue.net>; Date: Sun, 20 Feb 2011 23:07:30 -0800; What displacement is your target Mayf? Ford made 221 and 260 Windsors, but the 221 is a collectors item and 260 are almost as rare. I would call several engine builders and see if they can help you.; /html/land-speed/2011-02/msg00031.html (7,575 bytes)
5. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: "Dave Dahlgren" <dahlgren536@comcast.net>; Date: Mon, 21 Feb 2011 11:59:42 -0500; There are lots of smaller displacemet high performance engines available without jumping through the destroke hoop. Very short stroke big bore engines seldom make much in the way of power unless you; /html/land-speed/2011-02/msg00032.html (9,479 bytes)
6. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Rich Fox <v4gmr@yahoo.com>; Date: Mon, 21 Feb 2011 09:49:14 -0800 (PST); As fvar as the 260 being rare. If you want a block and crank from a '63 1/3 Falcon sprint 260. Drop on by. Free for the hauling. RF What displacement is your target Mayf? Ford made 221 and 260 Windso; /html/land-speed/2011-02/msg00033.html (9,142 bytes)
7. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: David <adin@frontier.net>; Date: Mon, 21 Feb 2011 14:33:44 -0700; IIRC (if I remember correctly ) the 221, 260, 289 all had the same stroke- one might verify this before getting too excited. As far as other motors, some may have decades of time/money invested in Fo; /html/land-speed/2011-02/msg00034.html (10,157 bytes)
8. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Bryan Savage <b.a.savage@wildblue.net>; Date: Mon, 21 Feb 2011 20:04:37 -0800; Correct. They are all ste same stroke. _______________________________________________ Land-speed@autox.team.net Donate: http://www.team.net/donate.html Archive: http://www.team.net/archive Forums: h; /html/land-speed/2011-02/msg00035.html (10,686 bytes)
9. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Tue, 22 Feb 2011 06:45:32 -0800; Easier and more economical to sleeve and pin all eight or even just a couple of cylinders. As far as the crank is concerned, you might offset grind it and chrome it back to -.20. Skip _______________; /html/land-speed/2011-02/msg00036.html (9,701 bytes)
10. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Tue, 22 Feb 2011 06:46:32 -0800; Easier and more economical to sleeve and pin all eight or even just a couple of cylinders. As far as the crank is concerned, you might offset grind it and chrome it back to -.020. Skip ______________; /html/land-speed/2011-02/msg00037.html (9,476 bytes)
11. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: "Rick Byrnes" <Rick@RBMotorsports.com>; Date: Tue, 22 Feb 2011 11:28:39 -0500; Dave, could you be a little more specific. In a naturally aspirated engine, lets say a 4" bore with a 2" or 2.5" stroke. I would also assume compression of around 15:1. Push rod, and valve train tech; /html/land-speed/2011-02/msg00038.html (8,954 bytes)
12. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: Larry Mayfield <drmayf@mayfco.com>; Date: Tue, 22 Feb 2011 10:17:37 -0800; All, Skip, sleeving now is reasonably expensive. You folk have no idea what I am thinking about for the destroked crank, the use there of. I don't want a V6 motor. Sleeving two cylinders and using a; /html/land-speed/2011-02/msg00041.html (11,270 bytes)
13. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: "Dave Dahlgren" <dahlgren536@comcast.net>; Date: Tue, 22 Feb 2011 13:18:37 -0500; Without turning this into either an essay or debate.... first the odds of making 15/1 CR in a pushrod anything with a 4" bore and 2" stroke are probably worse than winning Powerball. Second the block; /html/land-speed/2011-02/msg00042.html (10,664 bytes)
14. Re: [Land-speed] Destroking a Crankshaft... (score: 1): Author: "Rick Byrnes" <Rick@RBMotorsports.com>; Date: Tue, 22 Feb 2011 14:19:05 -0500; My answer to your original question, is why not. If you find an existing forging or billet, there is no reason that it cannot be done reliably. I did some cast cranks for ford about 25 years ago tha; /html/land-speed/2011-02/msg00044.html (8,529 bytes)

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