DIY_EFI Digest Thursday, February 3 2000 Volume 05 : Number 051 In this issue: willing to pay for project assistance RE: Camless engine Re: Camless engine Big Injectors Re: Big Injectors Re: Camless engine Re: Camless engine Re: Electro valves See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 2 Feb 2000 08:57:32 -0500 From: Rodney_L_Wiggins@xxx.com Subject: willing to pay for project assistance I am looking to have a relatively simple efi component designed and/or built. Does anyone here do or know someone that does any freelance work? I'm having an oscillation problem on a big turboed car with a MFS. I am simply looking for a device (analog or digital) that will set an adjustable limit on voltage output of my MFS when throttle position (and therefore voltage from my tps) is less than a specific, adjustable point. I've been trying to learn how to do this myself, but so far I just haven't had the time to work on this project. I am looking to improve part throttle drivability, but not ready to take the plunge and install a complete, proper EFI setup. When cruising I can watch the MFS voltage surge to the point where the mixture becomes very rich and then I believe I am "falling off the map" and the car bucks and stumbles. Please contact me if you are interested in this project or know someone who might be. Thanks Rod - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 2 Feb 2000 11:03:20 -0500 (EST) From: Mike Comai Subject: RE: Camless engine This subject caught my eye and I looked into the toyota and rover VVT (variable valve timing I think) systems. There are basically two types of systems in production/semiproduction right now. I've seens systems with multiple lift lobes with hydraulic "shifters" to select the lobe they want (this was a wierd setup and I didn't understand the theory but the principle seemed like a good one). Toyota's system and the most common is a cam gear on a kind of spedometer gear (for lack of a better description). There is a mechanism that adjust the location of one of the gears and thus advances or subtracts from the inital position. Thus with a seperate intake/exhaust cam you can overlap the openings for optimization ... this is great except all you can do is adjust the timing ... I'll try and find the webpage I was on and send it to the list. Mike Comai - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 02 Feb 2000 10:32:10 -0600 From: gabe Subject: Re: Camless engine Check out the Honda VTEC (Acura Integra / NSX / S2000 / Prelude) engine that has been in production for something like, over 8 years now. Now producing in the neighborhood of 120 hp per liter breathing normally. Just think if we could get that much pwr out of our domestic engines with that level of derivability and refinement. I wouldn't mind a 600+hp, 9000rpm SBC that idles like a stocker and behaves well enough in town that I could let my grandmother drive it. I have read somewhere that Honda is doing research on some form of camless engine as well. Gabe Mike Comai wrote: > This subject caught my eye and I looked into the toyota and rover VVT > (variable valve timing I think) systems. There are basically two types of > systems in production/semiproduction right now. I've seens systems with > multiple lift lobes with hydraulic "shifters" to select the lobe they > want (this was a wierd setup and I didn't understand the theory but the > principle seemed like a good one). Toyota's system and the most common is > a cam gear on a kind of spedometer gear (for lack of a better > description). There is a mechanism that adjust the location of one of the > gears and thus advances or subtracts from the inital position. Thus with > a seperate intake/exhaust cam you can overlap the openings for > optimization ... this is great except all you can do is adjust the timing > ... I'll try and find the webpage I was on and send it to the list. > > Mike Comai > > ---------------------------------------------------------------------------- > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) > in the body of a message (not the subject) to majordomo@xxx.org - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 2 Feb 2000 19:48:57 -0800 From: "Walter Sherwin" Subject: Big Injectors Hi All, Just uploaded a file to the new incoming directory, called "BigInjectors.zip". It contains some photo flow bench images and a brief discussion of each of the referenced larg'ish port injectors. This is in response to Clay's project, but thought others might find it useful too. Walt. - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 2 Feb 2000 20:33:48 -0500 From: "nacelp" Subject: Re: Big Injectors Thanks Walter, pics worth what is it nowadays 10K in words.... Grumpy > Hi All, > Just uploaded a file to the new incoming directory, called > "BigInjectors.zip". It contains some photo flow bench images and a brief > discussion of each of the referenced larg'ish port injectors. > This is in response to Clay's project, but thought others might find it > useful too. > Walt. - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Thu, 03 Feb 2000 05:01:42 GMT From: "Joe Bloggs" Subject: Re: Camless engine >I have read somewhere that Honda is doing research on some form of >camless >engine as well. Didn't some F1 cars use pneumaticaly operated valves to give infintely variable camtiming/lift? Sounds expensive tho.. Malcolm - ------- ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 02 Feb 2000 23:25:47 -0600 From: Gabe Subject: Re: Camless engine Already been discussed... Joe Bloggs wrote: > >I have read somewhere that Honda is doing research on some form of >camless > >engine as well. > > Didn't some F1 cars use pneumaticaly operated valves to give infintely > variable camtiming/lift? > Sounds expensive tho.. > > Malcolm > ------- > > ______________________________________________________ > Get Your Private, Free Email at http://www.hotmail.com > > ---------------------------------------------------------------------------- > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) > in the body of a message (not the subject) to majordomo@xxx.org - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: 3 Feb 2000 21:58:45 +1200 From: "Tom Parker" Subject: Re: Electro valves mark koenig wrote: >Carlo Putter wrote: >> >> Has anybody ever had an idea to manufacture a cam less machine. Well I've >> got that dream, maybe somebody has tried it already. >> > >My two cents worth: >Aren't we missing something? If we do away with the camshaft, why not >do away with the valves as we know them? How about an Iris? Or maybe >some sort of sliding/rotating window? Would seem to do away with the There are old engines that did this. They had a rotating sleeve around the cyclinder opening ports in it's walls. At least, I believe this is how it works, I'm sure others can tell us the details. I believe they are no longer made because they are difficult to make. - -- Tom Parker - parkert@xxx.nz - http://www.geocities.com/MotorCity/Track/8381/ - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ End of DIY_EFI Digest V5 #51 **************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".