<VV> WB units Re: Catalytic Converter for Corvair

[Bill H.]

                                    B"H

Thanks guys.  Good food for thought...Bill H.


--- FrankCB at aol.com wrote:

>  
> Craig, Bill and VVers, 
>     Wide band O2 units are available for less now IF
>  you are willing to 
> build them from a kit.  Better have excellent
> soldering  skills and a temp. 
> controlled fine pointed soldering iron to make it
> work.
>     Innovate Motorsports has both single units
> (already  built) and DUAL 
> ones.  The dual ones can show TWO separate readings
> at once  if you want to 
> install a separate sensor on each bank of the
> Corvair's exhaust  system.
>     IMHO, you really need a wideband unit to
> properly  setup an EFI 
> conversion.
>     Good luck!
>     Frank Burkhard
>  
> In a message dated 4/6/2008 8:06:16 PM Eastern
> Daylight Time, NicolCS  writes:
> 
> Bill wrote:
> 
> Something occurred to me...couldn't I  install 
> leaner
> jets in the carbs?
> 
> For most city driving (90% of my driving  is city
> under
> 30 mph) there is no bad smell whatsoever; when I get
> the  car up to 50 mph and over, I can smell the
> rotten
> eggs (very  slight).
> 
> btw the car still runs much better with the  cat
> installed.  Gas mileage is the same as before.
> 
> Thanks  guys for your advice...Bill Hershkowitz
>  
> Craig replies:
> The basic answer is "yes" a leaner main jet will
> lean-out the cruise,  
> especially when we remember that lots of folks throw
> in larger jets (usually  53s) 
> as a matter of course.  I'm a big fan of data and
> knowledge though  so if it 
> were me, I would install an oxygen sensor based
> air/fuel ratio meter  and find 
> out what's really happening.  I'd also suggest
> reading Bob  Helt's book on 
> Corvair Rochester carburetors so you can learn the
> effects of  emulsion tubes and 
> correction orifices to really do the job right.  
> Here's what happens if you 
> go too lean: (which is NOT "leaner", I mean TOO 
> lean): combustion chamber 
> temperatures go through the roof resulting in 
> detonation, burned valves (or 
> pistons), and prodigious Nox production.   There are
> two types of oxygen sensors: 
> Wide band, which are relatively costly  ($300 ish)
> and narrow band (which are 
> more like $120 ish). Narrow band sensors  will do
> the job (that's what I use) 
> but aren't nearly as accurate and require  more
> thoughtful interpretation 
> (guessing)
> Craig Nicol
> 
> 
> 
>  
> 
> 
> 
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> 



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