[Diy_efi] Making a fake O2

[Mike]

At 11:53 AM 30/05/05, you wrote:
>Ah, so your experience is a global observation on everything...

David, this is not *everything*, this is a specific technical list
where people are generally technical and that usually means
they have a background in high school physics, chemistry
and maths and move on to higher studies such as engineering,
masters or even a PhD...

The side effect of any technical discipline is the huge benefit
this allows to rationalise most phenomena in combination with
industrial and commercial complexity as they all come back to
scaffolding upon the fundamentals of physics and chemistry...

Engines are not that complex really, there are combinatorial
issues which are sometimes way beyond most people who
have never had the opportunity to get the basic groundwork
of physics and chemistry sorted out at an early point in their
development. Plus it helps to occasionally suspend personality
so one can launch into abstract notions with less limitation.

There's also nothing wrong with enjoying a good hard nosed
technical speculation from time to time either ;-)

>You must be a legend in your own mind! 

Do I hear knee jerk reaction from a battered ego...

<chuckle>

Mike





>> -----Original Message-----
>> From: diy_efi-bounces at diy-efi.org 
>> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Adam Wade
>> Sent: Sunday, May 29, 2005 10:11 PM
>> To: diy_efi at diy-efi.org
>> Subject: RE: [Diy_efi] Making a fake O2
>> 
>> --- David Cooley <n5xmt at bellsouth.net> wrote:
>> 
>> > If your injectors are starting to have reduced flow due to 
>> deposits, 
>> > low fuel pressure etc, the stock maps are NOT going to be safe.
>> 
>> Most Honda factory turbo motorcycles have never had their 
>> injectors cleaned, and many are operating with fairly clogged 
>> fuel filters.  I've never seen nor heard of any engine 
>> problem on ANY Honda turbo, for ANY reason.  They run 
>> open-loop, and have been in service since 1982.
>> 
>> If turbocharged motorcycle engines can handle it, I daresay 
>> normally-aspirated applications will be quite safe when 
>> operated in open-loop without BLM, unless the maps themselves 
>> are pretty horrible.
>> 
>> > The O2 sensor is there to correct for changes in 
>> airflow/fuel flow etc 
>> > in the engine to keep the A/F where the manufacturer specified...
>> 
>> No, the O2 sensor is to command a stoichiometric mixture 
>> during low-load steady-state operation.  One of the added 
>> benefits that has come with that is the
>> (limited) ability for a manufacturer to partially compensate 
>> for age via the use of BLM tables.  Prior to the emissions 
>> requirements that demanded a three-way catalyst and long-life 
>> emissions components, there were no oxygen sensors used in 
>> fuel injection. 
>> And if it was really that advantageous, then every 
>> fuel-injected motorcycle made in the past 10 years would have 
>> an O2 sensor.  You'll note that most of them don't, and the 
>> ones that do only did so when the EMISSIONS requirements were 
>> raised to the point where closed-loop running with a catalyst 
>> was necessary.
>> 
>> > If you take a vehicle that isn't brand new, and run it in open loop 
>> > with no corrections, then yes, the open loop maps MAY cause damage.
>> 
>> So all us motorcycle riders who got injected bikes without O2 
>> sensors can sue the manufacturer for making self-destructing 
>> engines?  Cool!
>> 
>> Frankly, since both open- and closed-loop running depend on 
>> the same ingition tables, any fuel maps that would "damage" 
>> an engine when it was older would also be very likely to 
>> damage it when new.  Further, think about where best-power 
>> fuel mixture is, in terms of potential engine damage...
>> 
>> Somehow, I am certain that those creating the fuel maps for 
>> automotive OEs are not neary as horribly stupid as you're 
>> saying they are.
>> 
>> | 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) | "It 
>> | was like an emergency ward after a great catastrophe; it  |
>> |   didn't matter what race or class the victims belonged to.   |
>> |  They were all given the same miracle drug, which was coffee. |
>> |   The catastrophe in this case, of course, was that the sun   |
>> |     had come up again."                    -Kurt Vonnegut     |
>> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
>> 
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Regards from


Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
http://niche.iinet.net.au