DIY_EFI Digest Friday, February 4 2000 Volume 05 : Number 052 In this issue: Re: Big Injectors Re: Big injectors Re: Big injectors new DDIS article RE: Camless engine RE: Camless engine Re: Vega engine Re: Vega engine Re: Vega engine RE: Camless engine See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Thu, 3 Feb 2000 10:35:59 -0600 From: "Andrew Theurer" Subject: Re: Big Injectors For the ftp challenged, where exactly is is? I looked at ftp://efi332.eng.ohio-state.edu/incoming/ but could not find it. Thanks Andrew Theurer > 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, 3 Feb 2000 09:19:51 -0800 (PST) From: Clay B Subject: Re: Big injectors Excuse my ignorance, but where is this FTP site? I take it this is not the same one that is referenced on the web page, as I do not find the aforementioned file there... Thanks, Walt. - - Clay - ---------------------------------------------------------------------------- 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 12:15:56 -0600 From: steve ravet Subject: Re: Big injectors Clay, and everyone else, it is the site mentioned on the new WWW page on the new WWW server. Those are: www.diy-efi.org ftp.diy-efi.org respectively. The big injector file is here: ftp://ftp.diy-efi.org/incoming/BigInjector.zip Clay B wrote: > > Excuse my ignorance, but where is this FTP site? I take it this is not the > same one that is referenced on the web page, as I do not find the > aforementioned file there... > > Thanks, Walt. > > - Clay > > ---------------------------------------------------------------------------- > 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 - -- Steve Ravet steve.ravet@xxx.com Advanced Risc Machines, Inc. www.arm.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: Thu, 03 Feb 2000 14:37:15 -0600 From: steve ravet Subject: new DDIS article An internet browser at large sent me the complete versin of Tim Drury's digital distributorless ignition article. The previous version was missing some source code among other things. If you've been interested you might look at it again as it is up to date now. It's on the diy_efi page, under members and projects. - --steve - -- Steve Ravet steve.ravet@xxx.com Advanced Risc Machines, Inc. www.arm.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: Thu, 03 Feb 2000 20:17:44 +0000 From: Ade + Lamb Chop Subject: RE: Camless engine At 11:03 02/02/00 -0500, 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. What about the Honda Vtec? Ade - ---------------------------------------------------------------------------- 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: Fri, 4 Feb 2000 05:55:10 +0800 From: Adrian Broughton 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. Here's a good web-page explaining Variable Valve Timing, and comparing the Honda and Toyota methods. The Toyota VVT you describe above has been superceded by TVVTiL, which is the same system (the VVT bit) but has "intelligence" (the i bit) that means it now has infinately variable timing, rather than just "mode A or mode B", and also variable lift (the L bit) which means it adjusts lift as well as timing. Anyway, read the page, it explains it all... http://www.onthenet.com.au/~billzila/vvtvtec.htm > >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. I think you are right Tom.. I remember reading an article in a really old copy of "Wheels" magazine (it was a 1960's issue) where they did a review of a new "Rotary Valve" engine that GM Holden had been developing here in Australia. I read the article a long time ago (5 years?), but kind of remember it. I think all the valve gear had basically been replaced by two overhead shafts (similar to an DOHC setup, but the shafts were much thicker) and these shafts had "flat spots" carved out of them.. basically the reverse of a normal cam, instead of having lobes that stick out you have indents that go in. The shaft rotates and as the flat-spots come round, they create a gap between the head and the shaft which allows the air/fuel or exhaust to go in or out. I'm not quite sure why they didn't take off. I think they could develop a fair bit of power (for the time), and you could use a file to make the flat spots bigger to give you the same thing as a bigger cam... but there was a reason they didn't take off... maybe lubrication, longevity, I dunno, can't remember. Anyway, the whole thing was basically self-contained in the head, so you could just bolt one of these heads onto your holden (not sure if it was for red motor or grey motor) and away you go.... They made 100 of them, so if you have a Holden with one of these heads then I reckon it would be worth a mint! Cheers, Adrian ___________________________________ Adrian Broughton 1990 GT-Four Celica (@15psi), 1974 VW Kombi, 1967 Holden HR Fremantle, Western Australia gtfour@xxx.au/~gtfour/ ___________________________________ - ---------------------------------------------------------------------------- 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 13:48:25 -0800 From: Ludis Langens Subject: Re: Vega engine Ade + Lamb Chop wrote: > > >Also betcha that the first engines with anything resembling solenoid > >operated valves are about as long lived and popular as the Vega engines > >were! > > Vega?? I think I have just made you point! So what is a Vega engine then? Nobody else has jumped in, so I'll answer even though the Vega is a bit before my time: The Vega engine was a SOHC 4 cylinder with an aluminum block with no cylinder liners. The aluminum had a high silicon content to minimize cylinder wear. I looked at one briefly in the wrecking yard - - the head seemed to be iron! - -- Ludis Langens ludis (at) cruzers (dot) com Mac, Fiero, & engine controller goodies: http://www.cruzers.com/~ludis/ - ---------------------------------------------------------------------------- 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, 3 Feb 2000 17:52:43 -0500 From: "nacelp" Subject: Re: Vega engine Geez, just to end this Vega had an AL block, and cast iron head. Easy to blow headgaskets, replace headgasket, and then blow the rings outta them. Was living in LA at the time, and saw many of them die. On a *good* hot evening driving from LA to Riverside, you could watch 2 start to smoke, and wind up on the side of the road, on the way home. Some folks loved them. Others hated them. Grumpy > > >Also betcha that the first engines with anything resembling solenoid > > >operated valves are about as long lived and popular as the Vega engines > > >were! > > Vega?? I think I have just made you point! So what is a Vega engine then? > Nobody else has jumped in, so I'll answer even though the Vega is a bit > before my time: The Vega engine was a SOHC 4 cylinder with an aluminum > block with no cylinder liners. The aluminum had a high silicon content > to minimize cylinder wear. I looked at one briefly in the wrecking yard > - the head seemed to be iron! - ---------------------------------------------------------------------------- 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, 3 Feb 2000 16:27:06 -0700 From: bearbvd@xxx.net (Greg Hermann) Subject: Re: Vega engine >Ade + Lamb Chop wrote: >> >> >Also betcha that the first engines with anything resembling solenoid >> >operated valves are about as long lived and popular as the Vega engines >> >were! >> >> Vega?? I think I have just made you point! So what is a Vega engine then? > >Nobody else has jumped in, so I'll answer even though the Vega is a bit >before my time: The Vega engine was a SOHC 4 cylinder with an aluminum >block with no cylinder liners. The aluminum had a high silicon content >to minimize cylinder wear. I looked at one briefly in the wrecking yard >- the head seemed to be iron! It was. And the silicon in the Al didn't do all they claimed it would for bore wear. The pistons were aluminium, but iron plated. If Ralph Nader had known diddly about engines, he wudda written a book about the things! Greg > >-- >Ludis Langens ludis (at) cruzers (dot) com >Mac, Fiero, & engine controller goodies: http://www.cruzers.com/~ludis/ > > >---------------------------------------------------------------------------- >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: Thu, 3 Feb 2000 15:51:48 -0800 From: "Randall" Subject: RE: Camless engine Not quite camless, but I recall reading many years ago an article (in Popular Mechanix ?) about a gentleman who had modified Pontiac's OHC in-line 6 with cam lobes that were tapered fore & aft, and a "flying ball" type governor built into the cam gear that moved the cam fore & aft with varying engine speed. (This was long enough ago that the OHC engine was quite unusual, but the in-line 6 was 'normal'.) I don't recall the resultant specs, but the improvement in both power and gas mileage was quite impressive, especially considering the relatively limited scope of the mod (stock carb, manifolds, exhaust, etc.). Randall - ---------------------------------------------------------------------------- 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 #52 **************************** 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".