DIY_EFI Digest Monday, March 20 2000 Volume 05 : Number 113 In this issue: Karmen Vortex info? Water injection. hall sensor simple questions Re: hall sensor simple questions See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 20 Mar 2000 18:37:49 +1100 From: Peter Gargano Subject: Karmen Vortex info? Anyone seen web based technical info on how Karmen Vortex MAF sensors work - I noticed one on a half-cut Mitsubishi the other day, during a wrecker-crawl. Anyone have any experience in using them? PG. - ---------------------------------------------------------------------------- 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: Mon, 20 Mar 2000 03:03:34 -0800 (PST) From: Roy Subject: Water injection. Hi all To ellaborate on my last note, the type of pump I am referring to is a small battery powered electric compressor that is sold here in the uk for pumping up your car tyres and it can easily produce 60Psi. What I suggested is that you pressurise the water container using compressed air. The pump can be controlled using a simple pressure switch and a solenoid between the water container and water injection nozzle controls the discharge into the airstream, this solenoid ideally wants to be controlled by your engine management software. I saw a very simple system in a magazine many years ago that used this idea, BUT they obtained their air pressure from the spare wheel/tyre !!!! from Roy Spectric's Ltd __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.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: Mon, 20 Mar 2000 03:29:33 -0800 From: "Toby Atwater" Subject: hall sensor simple questions As I understand it, a hall sensor can detect a metal mass approaching the sensor i.e. a distributor cam rotating and a hall sensor sensing the lobes. Crank shaft sensors can determine the position of the piston and therefore give the ECU a timing reference inorder to inject fuel at the right time. How many sensors do you need around the crank inorder to get a resolution that is useful? Is this multiplied by each cylinder as well? or can the ECU calculate where one piston is compared to another's location? Crank shaft sensors seem hard to implement on an old engine with no stock electronics what so ever. I was thinking about using the distributor's cam with a hall sensor in order to get spark timing and as well as Fuel Injection timing and thereby doing away with crank sensors completely. Is this possible? are the hall sensors accurate enough to not only detect a lobe peak but the lobe's approach and exit? Please help out a novice here... Thanks for your help Toby Atwater 1969 Austin Healey Sprite 1971 Toyota Land Cruiser - ---------------------------------------------------------------------------- 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: Mon, 20 Mar 2000 08:02:12 -0500 From: "nacelp" Subject: Re: hall sensor simple questions > As I understand it, a hall sensor can detect a metal mass approaching the > sensor i.e. a distributor cam rotating and a hall sensor sensing the lobes. Yes > Crank shaft sensors can determine the position of the piston and therefore > give the ECU a timing reference inorder to inject fuel at the right time. > How many sensors do you need around the crank inorder to get a resolution > that is useful? On some GM applications, they use 7 notches in the crank and one sensor (6 cyl), there are other strategies, like for SEFI, where you need to know cam posistion. Is this multiplied by each cylinder as well? or can the ECU > calculate where one piston is compared to another's location? ??. No reason to, that I can think of unless maybe for odd fires. > Crank shaft sensors seem hard to implement on an old engine with no stock > electronics what so ever. I was thinking about using the distributor's cam > with a hall sensor in order to get spark timing and as well as Fuel > Injection timing and thereby doing away with crank sensors completely. Is > this possible? Sure, numerous configurations use just Distributor signals. are the hall sensors accurate enough to not only detect a > lobe peak but the lobe's approach and exit? As far as I knoe they are digitial, you want an analog then pickup-coil reluctor is for proximity. Grumpy > Please help out a novice here... > Thanks for your help > Toby Atwater > 1969 Austin Healey Sprite > 1971 Toyota Land Cruiser > > -------------------------------------------------------------------------- - -- > 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 ------------------------------ End of DIY_EFI Digest V5 #113 ***************************** 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".