DIY_EFI Digest Tuesday, March 21 2000 Volume 05 : Number 115 In this issue: Re: DIY_EFI Digest V5 #112 Re: Chamber Isolation Hall Effect Sensor See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Tue, 21 Mar 2000 01:42:30 -0500 From: "Swayze" Subject: Re: DIY_EFI Digest V5 #112 got a chance to look at the book, seems this % alcohol sensor sends temperature and density signals to the ECM. works for ethanol and methanol. the way its drawn in the manual looks like a capacitor. has a paragraph on using a 'Tech 1 scan tool to determine percent methanol in the fuel,but really just mix with known volume of water as water an alcohol are mixable. 'M85' fuel--85%methanol,15%unleaded. a few paragraphs in there on formaldehyde as a byproduct. offhand anybody know the relative densities of unleaded,methanol and ethanol (vs. water). another question-- is methanol(ethanol) a significant knock deterrent? byE Mike Swayze mswayze@xxx.com kswayze@xxx.net ............ > >Subject: Re: Subject: Re: water into efi system before injectors. > > > >I have a manual on the dual fuel 90-91 lumina, seems it had some sort of > >sensor on the fuel line to determine the percentage of alchohol in the > >fuel. any idea how it would work? > >byE > >Mike > >Swayze ....... > production. Fuzzy recollection says it was done with a light beam and a > sensor that measured the light refraction, don't know if it went in to > production that way or it was just an idea that they were working with. > > Todd Israels ..... - ---------------------------------------------------------------------------- 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: Tue, 21 Mar 2000 01:20:43 -0800 (PST) From: Roy Subject: Re: Chamber Isolation Hi all In reply to Mikes message: The best solution to "aerodynamics in the crankcase" is best achieved when the engine runs a dry sump lubrication system for the following reasons. 1) The crankshaft is not rotating in an oil bath which waste power. 2) By using a 3 stage pump with a single pressure stage and two scavenge pumps, with a sealed crankcase, you can run a partial vacuum in the crankcase, just make sure that the oil tank has plenty of ventilation. Roy Spectric's Ltd > Date: Thu, 16 Mar 2000 02:56:07 > From: "Mike (Perth, Western Australia)" > > Subject: CHamber isolation ? > > Hi all, > > I notice on all engines I've worked on that > aerodynamics in the crankcase > aren't given much attention in production engines > (fair enough for cost), > > I have the opportunity to work on and modify the > crankcase on a straight > six (RB30ET) block and wondered if its worth trying > chamber isolation in > the crankcase. > > ie. Rather then having crankcase gases move around > between chambers from > various pistons etc, why not isolate each chamber > with baffles (other > then a small hole for oil outlet). That way on the > descending stroke, the > crankcase gets pressurised and this 'power' is > returned on the compression > cycle - or at least some of it - allowing for some > oil outlet through the > hole naturally. The overall blowby should still > allow the oil to exit > and not upset the bearings... > > In essence, each chamber in the crankcase has its > own oil hole(s) into > the main crankcase (baffle added so that each > chamber has its own mini > crankcase slightly abive the main crankcase)... > > Is this completely off beam - or do the F1 guys do > this sort of thing > at their usual 16,000 rpm engines ? > > I'm only interested actually as its quite easy to do > and would make an > interesting experiment... > > Tah > > :) mike > __________________________________________________ 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: Tue, 21 Mar 2000 04:12:18 -0800 (PST) From: Carter Shore Subject: Hall Effect Sensor Ade wrote: > So Hall effect sesors don't need a magnet on the > thing that is moving? > It > just has to be ferous... The magnetic field strength at the sensor must vary + and - relative to the threshold in the sensor. You can use a fixed magnet biasing a moving ferrous shutter or wheel. Prototype it first to make sure that the sensor will trigger. If the magnet is too strong or too weak, or the components are placed wrong, the field strength will not vary past the trigger point of the sensor. __________________________________________________ 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 ------------------------------ End of DIY_EFI Digest V5 #115 ***************************** 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".