Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Tue, 3 Aug 2021 16:25:27 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 173NFxvN024345; Tue, 3 Aug 2021 19:16:45 -0400 Received: from outgoing-exchange-5.mit.edu (OUTGOING-EXCHANGE-5.MIT.EDU [18.9.28.59]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 173NFv19024342 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Tue, 3 Aug 2021 19:15:57 -0400 Received: from oc11exedge2.exchange.mit.edu (OC11EXEDGE2.EXCHANGE.MIT.EDU [18.9.3.18]) by outgoing-exchange-5.mit.edu (8.14.7/8.12.4) with ESMTP id 173NFuMD009647 for ; Tue, 3 Aug 2021 19:15:57 -0400 Received: from w92expo26.exchange.mit.edu (18.7.74.32) by oc11exedge2.exchange.mit.edu (18.9.3.18) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Tue, 3 Aug 2021 19:15:33 -0400 Received: from oc11exhyb8.exchange.mit.edu (18.9.1.113) by w92expo26.exchange.mit.edu (18.7.74.32) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Tue, 3 Aug 2021 19:15:56 -0400 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (104.47.66.41) by oc11exhyb8.exchange.mit.edu (18.9.1.113) with Microsoft SMTP Server (TLS) id 15.0.1497.23 via Frontend Transport; Tue, 3 Aug 2021 19:15:56 -0400 Received: from BN9PR03CA0069.namprd03.prod.outlook.com (2603:10b6:408:fc::14) by DM5PR01MB2553.prod.exchangelabs.com (2603:10b6:3:40::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.25; Tue, 3 Aug 2021 23:15:49 +0000 Received: from BN8NAM11FT006.eop-nam11.prod.protection.outlook.com (2603:10b6:408:fc:cafe::72) by BN9PR03CA0069.outlook.office365.com (2603:10b6:408:fc::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.18 via Frontend Transport; Tue, 3 Aug 2021 23:15:49 +0000 Received: from mulvey.us (24.169.71.174) by BN8NAM11FT006.mail.protection.outlook.com (10.13.177.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4373.18 via Frontend Transport; Tue, 3 Aug 2021 23:15:49 +0000 Received: from [192.168.100.55] ([192.168.100.55]) by mulvey.us with MailEnable ESMTPSA (version=TLS1_2 cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256); Tue, 3 Aug 2021 19:15:47 -0400 From: Allen Mulvey To: "piclist@mit.edu" Sender: "piclist-bounces@mit.edu" Date: Tue, 3 Aug 2021 16:15:47 -0700 Subject: Re: [EE] Honda MT250 ignition waveforms Thread-Topic: [EE] Honda MT250 ignition waveforms Thread-Index: AdeIvtgEU5nvA0rlRJe3YZz8EOum/w== Message-ID: <29feeb7f-5fb6-cfd8-2dc2-5a8240dbdfa9@amulvey.com> References: <80ebcbcd-d532-1c34-c71c-dfe9e9e77c3c@amulvey.com> <00024edd0441d38f21d7d4a927f2c134.squirrel@mai.hallikainen.org> List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US Content-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of amulvey.com designates 24.169.71.174 as permitted sender) receiver=protection.outlook.com; client-ip=24.169.71.174; helo=mulvey.us; dkim-signature: v=1; c=relaxed/relaxed; h=subject:to:references:from:message-id:date:mime-version:in-reply-to:content-type; d=amulvey.com; s=amulvey; a=rsa-sha256; bh=mA6IAodljKEIYaRdQfnJZq8TebO6+S6NDfR+M7tdtWI=; b=N6EmpV7Vnx3AqTKAR1Ro2nvO5kSSDipXx3c4S96Y+83A3d/PLGQO6vqylCgT03BA4 rdvEJDGDmUlxLfV/OB2PMbfXP/9XfQ0S2x0kOV8pWOIrLPSiAU0bZ6AIi4lb2qSlw2P WA+FdAo8alQockPYnQ/P7eTs6WKfwsPDcy+Eeno=; authentication-results: spf=pass (sender IP is 24.169.71.174) smtp.mailfrom=amulvey.com; mit.edu; dkim=pass (signature was verified) header.d=amulvey.com;mit.edu; dmarc=bestguesspass action=none header.from=amulvey.com; user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-topics: [EE] x-content-filtered-by: Mailman/MimeDel 2.1.6 x-me-bayesian: 0.000000 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 In most traditional ignition systems the points open to generate a=20 spark. Magnetic fields tend to collapse much faster than they expand so=20 it usually gives a much hotter spark. I'm going back 5 decades. Allen On 8/3/2021 6:23 PM, RussellMc wrote: > On Wed, 4 Aug 2021, 09:16 Harold Hallikainen, > wrote: > >> After cleaning, >> we are able to see them close at the correct time (resistance drops to >> zero when the mark on the flywheel lines up with the timing mark). >> > This may not apply here, but usually points will OPEN at the timing mark > (according to my 3+ decades old memories) > > Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .