DIY_EFI Digest Tuesday, 9 September 1997 Volume 02 : Number 312 In this issue: Re: Propane on Fuel Injected Cars Re: Fuel Pressure.....what to use ? Fruitless Political Argument See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Neall Booth Date: Mon, 08 Sep 1997 21:14:36 -0700 Subject: Re: Propane on Fuel Injected Cars Greg Wood: > I'm kind of curious on this also. Can I use the same > ECM and just change to propane injectors?? Not very likely. If you simply want to use the gasoline computer in your vehicle you will have a lot of trouble making propane injection work. Almost universally, propane is utilized in it's vapour phase. As such, the pulse widths required to inject a stoichiometric amount of fuel are considerably longer than gasoline. Additionally, there aren't any "propane" injectors avaliable, that I know of. However, natural gas injectors, like those made by Bosch for Chrysler do work. You will need complete access to the ECM though to optimize fuel delivery, etc. Ideally you would like to inject propane as a liquid into the cylinder, and gain the effects of charge cooling. However, liquid phase propane injection is a whole different ball of wax, one that even the propane industry is reluctant to touch. > Are their > any books written detailing conversions and whats involved? > I guess thats basically what i'm lookin for. A "How to" book > that would explain all the pitfalls etc. that are involved in a > conversion of this type. There are books avaliable on converting a vehicle to run on vapour propane carburation, however information of propane FI is limited at best (scarce to nil might be a better explination). The propane industry is presently lagging behind the gasoline industry by a great many years, and as such there is limited information, parts, and technical help avaliable for developing propane fuel injection. An actual propane conversion is not too difficult. However, if you want to make it a fuel injection system it will complicate the matter. If you've got more questions, fire away. Neall - -- ********************************** Neall Booth Bi-Phase Technologies Development & Applications Engineer nbooth@xxx.net ********************************** ------------------------------ From: Simon Quested Date: Tue, 09 Sep 1997 15:06:00 +1200 Subject: Re: Fuel Pressure.....what to use ? Hi JW and All > > The ecu will take care of that, I'm going to running an O2 sensor so > > I can keep and eye on the mixture. if it gets to low I run a 5th > > injector parallel the water injector. > How is the ECU going to take care of that? ...it's an old system it has 7 pots for the rev range and a pot to set up the on time at WOT and a master mix pot, so if the 4 injectors can't supply enough I'll add a 5th injector. > What will control your 5th injector? Still building that ;-).......map sensor input controlling the duty cycle of the injector..... > What are you using for an intercooler? RX7 700cfm (I think) intercooler > Hope you don't mind the prying questions, nope, it's good 'cause I'm hoping that you guys & gals will pick up any stupid ideas I have ;-) > I'm in the middle of "maximum boost" > by Corky Bell. Great book. I'd recomend it if you don't have it. Great book got it a couple of months ago from amonzon.com great service as well. > Why the water injection? Intercooling, proper fuel and spark management > should rule out the need for water injection. What's up? Wanting to run 10 - 20 psi on pump gas not proper fuel.... the gas in the new unleaded is shit if it was in the states it would be banned, 47% airomatics =-( full of benzine now ......I'd rather have the lead .....is it true that in America all fuel pumps must have extractors on the nozzel to suck the fumes away?? Cheers Simon +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Simon Quested (E-mail questeds@xxx.nz) Computer Technician, Silicon Graphics & Windows NT Support Centre for Computing and Biometrics LINCOLN UNIVERSITY OF NEW ZEALAND Phone (64)(03) 3252811 Ext. 8087 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ http://www.lincoln.ac.nz/ccb/techs/simon/default.htm +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ When the chips are down, the cow is empty. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------ From: Rich Mauruschat Date: Tue, 9 Sep 1997 08:52:17 +0100 Subject: Fruitless Political Argument >Subject: Re: why rich is better for power >Any chance that you could move this discussion to the "Fruitless >Political Arguement" newsgroup and leave this one to those interested in >DIY_EFI? > Bill in Boulder "Engineering as an Art Form" YES Bill, exactly my sentiments! ------------------------------ End of DIY_EFI Digest V2 #312 ***************************** 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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