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1. [Land-speed] Multiple Engines (score: 1): Author: Skip Higginbotham <Saltrat@pahrump.com>; Date: Tue, 23 Mar 2010 13:42:16 -0700; When connecting two engines together at the crankshafts, what is the best offset to use? My thought is that harmonics should be arranged such that the rear crankshaft gets as little abuse as possibl; /html/land-speed/2010-03/msg00170.html (6,970 bytes)
2. Re: [Land-speed] Multiple Engines (score: 1): Author: "Dave Dahlgren" <ddahlgren@snet.net>; Date: Tue, 23 Mar 2010 17:04:14 -0400; Having never done done this but intuitively I would separate the firing points 45 degrees EX if engine 1 were to fire at 0 BTDC I would have engine 2 fire either 45 BTDC or 45 ATDC to fill in the tim; /html/land-speed/2010-03/msg00172.html (7,566 bytes)
3. Re: [Land-speed] Multiple Engines (score: 1): Author: "MEIERLE Mike" <Mike.Meierle@alcatel-lucent.com>; Date: Tue, 23 Mar 2010 16:32:52 -0500; So the idea is to make it a smooth V16 instead of a synchronized Double V8? Wonder what the Tractor Pull guys are doing with the 5 engine setups? Mike Meierle Sr. Systems Engineer Alcatel-Lucent 7751; /html/land-speed/2010-03/msg00173.html (9,861 bytes)
4. Re: [Land-speed] Multiple Engines (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Tue, 23 Mar 2010 14:42:46 -0700; Thank you and you are welcome! I will try to get to the 45 degree number.....coupler is made and it has 20 teeth and 6 bolts so some combination of those should result in 42 degrees........or so. One; /html/land-speed/2010-03/msg00174.html (9,328 bytes)
5. Re: [Land-speed] Multiple Engines (score: 1): Author: "Dave Dahlgren" <ddahlgren@snet.net>; Date: Tue, 23 Mar 2010 18:05:17 -0400; Put a speed sensor with the same number of teeth on the front and rear of the crank and watch for degrees of separation change. that will read directly into degrees of twist and I have no idea what i; /html/land-speed/2010-03/msg00175.html (9,658 bytes)
6. Re: [Land-speed] Multiple Engines (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Tue, 23 Mar 2010 15:16:45 -0700; Thanks Dave, I'll head that way. How did you do at Sebring? Skip _______________________________________________ Land-speed@autox.team.net Donate: http://www.team.net/donate.html Archive: http://www.; /html/land-speed/2010-03/msg00176.html (9,348 bytes)
7. Re: [Land-speed] Multiple Engines (score: 1): Author: "Dave Dahlgren" <ddahlgren@snet.net>; Date: Tue, 23 Mar 2010 18:31:27 -0400; My idea is you fill in you do not add much twist or torque and in you close them up they add to the torque on the rear crank has to transfer.. Like I said no practical experience but shooting form th; /html/land-speed/2010-03/msg00177.html (9,300 bytes)
8. Re: [Land-speed] Multiple Engines (score: 1): Author: drmayf <drmayf@mayfco.com>; Date: Tue, 23 Mar 2010 16:16:34 -0700; Hey, Dave! Good to see you survived all the snow and stuff. You bring up an interesting sub plot in your statement. And that would be placing teh cranks in such a position that teh torques do add tog; /html/land-speed/2010-03/msg00179.html (9,741 bytes)
9. Re: [Land-speed] Multiple Engines (score: 1): Author: "John Burk" <joyseydevil@comcast.net>; Date: Tue, 23 Mar 2010 20:41:57 -0400; I think crankshafts are stout to raise the harmonic frequency and resist bending . For torque capacity think how small the transmission input shaft is . John _________________________________________; /html/land-speed/2010-03/msg00181.html (8,717 bytes)
10. Re: [Land-speed] Multiple Engines (score: 1): Author: drmayf <drmayf@mayfco.com>; Date: Tue, 23 Mar 2010 18:14:59 -0700; Aren't torsonial frequencies important? That is probably more in line with shearing at the main bearing journals. _______________________________________________ Land-speed@autox.team.net Donate: htt; /html/land-speed/2010-03/msg00182.html (9,537 bytes)
11. Re: [Land-speed] Multiple Engines (score: 1): Author: "23weldon" <23.weldon@comcast.net>; Date: Tue, 23 Mar 2010 20:17:48 -0700; Sparky and others -- My thought on this is that more torsional dampening in the form of a better harmonic balancer might be what is called for. Of course that is aside from the issues of misalignment; /html/land-speed/2010-03/msg00186.html (11,334 bytes)
12. Re: [Land-speed] Multiple Engines (score: 1): Author: "John Burk" <joyseydevil@comcast.net>; Date: Wed, 24 Mar 2010 00:31:35 -0400; In Bill Hoddinott's Burkland interview in the most recent issue of Bonneville Racing News they said they have Vibratec Fluidampers with 4 keys on each engines and a custom coupler made from "old Lenc; /html/land-speed/2010-03/msg00188.html (11,842 bytes)
13. Re: [Land-speed] Multiple Engines (score: 1): Author: "Neil Albaugh" <neil@dbelltech.com>; Date: Wed, 24 Mar 2010 08:48:44 -0700; Crankshaft designs vary depending on what the engine is designed to drive. An aircraft engine drives a propeller, which is considered a "flexible load". Their crankshafts are light and so they lack; /html/land-speed/2010-03/msg00190.html (9,655 bytes)
14. Re: [Land-speed] Multiple Engines (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Wed, 24 Mar 2010 10:50:46 -0700; Thanks everybody for the info. Gary, I have the actual drawings of the Vesco coupler courtesy of Rick and Don several years ago and it looks nice and strong and good compliance. John, I have discusse; /html/land-speed/2010-03/msg00192.html (9,671 bytes)
15. [Land-speed] Multiple Engines (score: 1): Author: "Kirkwood" <saltfever@comcast.net>; Date: Wed, 24 Mar 2010 18:16:49 -0700; It seems to me you may be smoothing out your torsional frequency. As Dave mentioned the cylinder pressure is greatest somewhere around 14 degrees. If you index the motors 45 degrees the pressure peak; /html/land-speed/2010-03/msg00200.html (8,586 bytes)
16. Re: [Land-speed] Multiple Engines (score: 1): Author: Skip Higginbotham <saltrat@pahrump.com>; Date: Thu, 25 Mar 2010 15:30:42 -0700; I think so too. So, if I understand, the rear crank effectively stays loaded and never unloads as much as it would have on it's own. As you point out, the cycle is therefore shorter in amplitude so l; /html/land-speed/2010-03/msg00206.html (9,294 bytes)

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