DIY_EFI Digest Tuesday, 23 March 1999 Volume 04 : Number 188 In this issue: Re: Injector Math Re: Ceramic Coatings and EGT RE: injector manifold design RE: TBI Parts Wanted and 2.8 Parts for Free Port intake design RE: TBI Parts Wanted and 2.8 Parts for Free RE: TBI Parts Wanted and 2.8 Parts for Free Re: 02 sensor - temprature compensation. See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Jason_Leone@xxx.com Date: Mon, 22 Mar 1999 12:22:06 -0800 Subject: Re: Injector Math You forgot something! The injector duty cycle must be plugged in to the formula too. You had: So I have flow (lb/hr) = HP x .55 -------- 8 You should have: lb/hr = (est. Hp) x (BSFC) ( #cyl ) x (duty cycle) Multiply the lb/hr flow by 10.515 to get cc/min. This is what the injectors will flow AT RATED PRESSURE. So, for an 80% duty cycle, should be: (lb/hr) = HP x .55(forced induction) -------- 8 x (.80) Jason '93 SLC ------------------------------ From: Matt Beaubien Date: Mon, 22 Mar 1999 13:40:18 -0700 (MST) Subject: Re: Ceramic Coatings and EGT Frederic, > ceramic coatings reflect or isolate I guess is a better word > the metal that's coated from the explosions that occur in > your engine. Considering these explosions are a few > thousand degrees, an exhaust temperature of 900-1200 is not > unreasonable, especially if the compression is high. Just a slight correction. As the CR goes up, EGT's come down. The engine is more efficient so less heat is rejected. One the Bush GN engines (I think?), they have a restriced CR and have trouble with exhuast valve life. More so than the unrestricted engines. Matt Beaubien mbeaubie@xxx.ca 3 x 510 1 x 300ZXT ------------------------------ From: "Stowe, Ted-SEA" Date: Mon, 22 Mar 1999 13:06:35 -0800 Subject: RE: injector manifold design I see, thanks. that is a nasty problem, and yes it would be a lot of work to resolve. but I am wondering what is so different from the carb setup on it now. the same problem must be there I think. ? > -----Original Message----- > From: Mike Morrin [SMTP:mikem@xxx.nz] > Sent: Monday, March 22, 1999 11:34 AM > To: diy_efi@xxx.edu > Subject: RE: injector manifold design > > At 07:15 am 22/03/99 -0800, Stowe, Ted-SEA wrote: > >yes I wondered about that, but I was considering that since by design the > >Bosch system fires all 4 injectors like a bank at a time, 2 big injectors > >per port, both firing all the time, seems like it would have a lot of > >overlap. I can't immediately see the value of having 4 injectors, which > >would be physically hard to do with 2 intake ports, but 2 bigger ones > >instead might logically work. ?? > > I don't know if you saw my meaning.... > > Looking at one of your ports, the firing order is something like > 1-gap-gap-2-1-gap-gap-2....... > Now if you are squirting fuel at 80% duty cycle, what is going to stop > cylinder 2 from sucking in some of the fuel which was intended for > cylinder 1? > > You could go for a sort of modified-sequential injection, but you would > then be limited to a 25% maximum duty cycle per cylinder, which would > require timed injection, large injectors, and difficult idle control, not > to mention custom ECU software. > > regards, > Mike > ------------------------------ From: "Kurek, Larry" Date: Mon, 22 Mar 1999 15:21:55 -0600 Subject: RE: TBI Parts Wanted and 2.8 Parts for Free Grrrr... Looks like I'm striking a dry hole on this one. I find it difficult to believe, that with all of the TPI conversions out there, that nobody closer has a TBI available.... No luck on the distributor ;) Well, if you would like to get rid of it, let me know and we can work something out. My address is: Larry Kurek 357 Meadowlark Dr Bolingbrook, IL 60440 630-226-0535 (h) Where in Canada are you? I was in Windsor not that long ago to meet a guy from Vancouver (?) to pick up a block. Thanks! Larry > -----Original Message----- > From: Peter Fenske [mailto:pfenske@xxx.ca] > Sent: Monday, March 22, 1999 9:55 AM > To: diy_efi@xxx.edu > Subject: Re: TBI Parts Wanted and 2.8 Parts for Free > > > > > Hi Larry > > I got a few olde tbis manifoldes here larry but I live in kanadada.. > Let me know if you turn up a blank. > > Petered out. > > ------------------------------ From: andy quaas Date: Mon, 22 Mar 1999 13:47:49 -0800 (PST) Subject: Port intake design Since we are all talking about the intake for a 4-cylinder, how about this? I have been toying with the idea of creating a port injection intake manifold from an aluminum single plane, such as force-efi does. Has anyone here done this? How does one position the injectors in the ports? Andy _________________________________________________________ DO YOU YAHOO!? Get your free @xxx.com ------------------------------ From: "Kurek, Larry" Date: Mon, 22 Mar 1999 16:16:32 -0600 Subject: RE: TBI Parts Wanted and 2.8 Parts for Free Whoops! That damn "reply-to" thing got me... :) Sorry for the clutter... > -----Original Message----- > From: Kurek, Larry [mailto:lkurek@xxx.gov] > Sent: Monday, March 22, 1999 3:22 PM > To: 'diy_efi@xxx.edu' > Subject: RE: TBI Parts Wanted and 2.8 Parts for Free > > > Grrrr... > > Looks like I'm striking a dry hole on this one. I find it difficult to > believe, that with all of the TPI conversions out there, that > nobody closer > has a TBI available.... No luck on the distributor ;) > > Well, if you would like to get rid of it, let me know and we can work > something out. My address is: ------------------------------ From: Don.F.Broadus@xxx.com Date: Mon, 22 Mar 1999 16:19:47 -0600 Subject: RE: TBI Parts Wanted and 2.8 Parts for Free Larry; take RT 53 to 75 Th street to RT59 by the fox valley mall turn left on liberty by potillo's drive about 1/4 mile to aurora auto parts U-PULL-IT (630-375-0600) I have bought several TBI manifolds (1988 angle bolts) and even found a complete Camaro TPI set up. The TBI manifold will cost you $21 coil $4 Dist $29 injectors $10 7:30 to 5 PM seven days a week. I love this place and I'm sure you will also. Don > -----Original Message----- > From: Kurek, Larry [SMTP:lkurek@xxx.gov] > Sent: Monday, March 22, 1999 3:22 PM > To: 'diy_efi@xxx.edu' > Subject: RE: TBI Parts Wanted and 2.8 Parts for Free > > Grrrr... > > Looks like I'm striking a dry hole on this one. I find it difficult to > believe, that with all of the TPI conversions out there, that nobody > closer > has a TBI available.... No luck on the distributor ;) > > Well, if you would like to get rid of it, let me know and we can work > something out. My address is: > > Larry Kurek > 357 Meadowlark Dr > Bolingbrook, IL 60440 > > 630-226-0535 (h) > > Where in Canada are you? I was in Windsor not that long ago to meet a guy > from Vancouver (?) to pick up a block. > > Thanks! > > Larry > > > -----Original Message----- > > From: Peter Fenske [mailto:pfenske@xxx.ca] > > Sent: Monday, March 22, 1999 9:55 AM > > To: diy_efi@xxx.edu > > Subject: Re: TBI Parts Wanted and 2.8 Parts for Free > > > > > > > > > > Hi Larry > > > > I got a few olde tbis manifoldes here larry but I live in kanadada.. > > Let me know if you turn up a blank. > > > > Petered out. > > > > ------------------------------ From: xxalexx@xxx.com Date: Mon, 22 Mar 1999 17:12:28 +0000 Subject: Re: 02 sensor - temprature compensation. > > Just a thought... Why not use a cheaper 1 wire o2 sensor and monitor its > > temperature by measuring the sensor's impedence. > > > > Wen > Likely because you can't. The "impedence" of a battery is hard to read. > There is a recent tech forum discussion on O2 temperature monitoring at the IATN web site. http://www.iatn.net/ Seems Ford puts the current draw in scanner data. Comments were made by GM and Ford reps. Excellent site if you are mechanic, you have to register but no charge. Have not seen any DIY hackers forums there yet. alex ------------------------------ End of DIY_EFI Digest V4 #188 ***************************** 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".