DIY_EFI Digest Sunday, 3 November 1996 Volume 01 : Number 333 In this issue: Re: Ignition List Dynamos Re: Question...Timing of fuel delivery Re: Question...Timing of fuel delivery Re: Dynamos See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Robert Yorke Date: Sat, 2 Nov 1996 09:43:08 -0800 (PST) Subject: Re: Ignition List Mark: Your attachment arrived okay, but it's shown as a file with no extension to it. I've tried renaming it as a txt file but all I get is code. What is it (i.e.) wpd, doc, etc. ?? snipped > >Mark. > > >Attachment Converted: "C:\DELTANET\EUDORA\ATTACHIT\Ignition" > ------------------------------ From: Mark Pitts Date: Sat, 2 Nov 1996 22:37:23 -0000 Subject: Dynamos I know I'm off topic, but we are killing our selves here. We have a 1934 Riley, and it is fitted with a Rotax three brush dynamo. It doesn't work. We don't know how it should work, further more we can't find anybody still alive that knows! HELP! Even if you dont know how our setup works, but ya do know how a three brush dynamo should work, please share it with us! Mark saxon@xxx.org ------------------------------ From: "R. Larson" Date: Sat, 02 Nov 1996 21:59:47 -0600 Subject: Re: Question...Timing of fuel delivery >For a winter project, I plan to build a digital EFI/Ignition for my >motorcycle. What is the ideal (if there is such a thing) time for the >fuel to be injected into the intake runner? Should fuel only be injected >while the air in the respective runner is moving? I am also iinterested in doing this. I have already done some research into this but my particular application might not be as usefull to you as could be. My bike is a Harley and therefore uses one carberator and manifold for both cylinders. My unit is beeing based on a Multi-port fuel injection where all injectors are fired with each spark pulse. Since I have a two cylinder engine, each injector is fired for 1/2 gas charge so that there is a full charge for every two rotations. I have been informed that at RPMs above idle, the air never gets a chance to actually stop in the manifold and although it is not as perfectly timed as having it pulse when the intake vale opens, it degrades only slightly at low speeds. To get the pulse timed with the intake valve would probably need a flywheel position sensor. Also my unit would not control spark timing since there are many aftermarket units which allow full timing curves so my system would be in conjuction with theirs. I would like to hear what kind of bike yours is and how detailed the FI is going to be. Thanks for your post. ------------------------------ From: "R. Larson" Date: Sat, 02 Nov 1996 21:58:11 -0600 Subject: Re: Question...Timing of fuel delivery >For a winter project, I plan to build a digital EFI/Ignition for my >motorcycle. What is the ideal (if there is such a thing) time for the >fuel to be injected into the intake runner? Should fuel only be injected >while the air in the respective runner is moving? I am also iinterested in doing this. I have already done some research into this but my particular application might not be as usefull to you as could be. My bike is a Harley and therefore uses one carberator and manifold for both cylinders. My unit is beeing based on a Multi-port fuel injection where all injectors are fired with each spark pulse. Since I have a two cylinder engine, each injector is fired for 1/2 gas charge so that there is a full charge for every two rotations. I have been informed that at RPMs above idle, the air never gets a chance to actually stop in the manifold and although it is not as perfectly timed as having it pulse when the intake vale opens, it degrades only slightly at low speeds. To get the pulse timed with the intake valve would probably need a flywheel position sensor. Also my unit would not control spark timing since there are many aftermarket units which allow full timing curves so my system would be in conjuction with theirs. I would like to hear what kind of bike yours is and how detailed the FI is going to be. Thanks for your post. ------------------------------ From: Steve Baldwin Date: Sun, 3 Nov 1996 18:52:47 +1300 (NZDT) Subject: Re: Dynamos > > I know I'm off topic, but we are killing our selves here. > > We have a 1934 Riley, and it is fitted with a Rotax three brush dynamo. > > It doesn't work. > > We don't know how it should work, further more we can't find anybody still alive that knows! HELP! > > Even if you dont know how our setup works, but ya do know how a three brush dynamo should work, please share it with us! > > Mark > > saxon@xxx.org > > If the dynamo has been sitting unused for some time, it may just need polarising. You do this by just touching a wire from the battery to the out terminal. Use some thin, multistranded wire and just wipe it across the threads so you get a few little sparks. This simply sets up some residual magnetism in the core which is enough to get things going. There needs to be some magnetism to generate some current that then gets put into the field coils to make more magnetic field and more current. If it's not as simple as that, the other thing to check is the brushes. Most auto sparkies should be able to check a generator. The third brush part does what a regulator did in later years. It's sort of a second generator that feeds the field coils. You adjust the amount of current going to the field coils by moving the position of the brush. Steve. ------------------------------ End of DIY_EFI Digest V1 #333 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. 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