<VV> RE: Re: octane and alky - adjustment in a Corvair

[Eric S. Eberhard]

So how is the Safeguard different from the Knock Eliminator from Clark's ???
Where do I get it and how much does it cost?  Do you know how well it 
works?  Especially with the low rpm knock problem I have.

How do either of these units connect to the car.  I try very hard to keep a 
1962 look and am curious if I will be able to hide either of these.

The MSD is not really a knock eliminator, it is something that lets him 
change all kinds of cool ignition tuning stuff.  He likes that stuff.  It 
is actually and add-on to the MSD 6a that I use in my cars (the MSD 6a 
comes with or without the ports to add his toys on to).  Next time I see 
him I'll ask and report back exactly what it does.


At 03:27 PM 6/22/2005, Jim Burkhard wrote:
> > Our Land Cruiser actually lists different horsepower based on
> > the Octane
> > (actually based on using premium or regular).  I assume it
> > adjusts timing
> > primarily by detecting knock(?) and that the adjustment
> > lowers power.
>
>Yes
>
> >It could possibly adjust fuel as well.
>
>No, it will run stoichiometric in either case.  Actually, the retarded case
>will use a bit more fuel, because your timing is retarded off the MBT
>optimum and you lose thermal efficiency when you do that. How much depends
>on how retarded you are.  Of course you are using *cheaper* fuel at the same
>time, though....
>
> > On a Corvair, automatic detection is probably unlikely.
>
>Not at all ... the Safeguard ignition that Ray Sedman sell does just that.
>
> > However, I have a  friend here in AZ that uses an MSD ignition with an
> > instrument located on  the dash to make all kinds of adjustments with all
>kinds of
> > controls.  He  uses it to adjust for altitude (because it is easy to go
> > plus/minus 3-4000  feet here) and to adjust for fuel.  I believe it does
>more
> > than just retard ignition, I believe it also affects the advance curve if
>desired.
>
>Maybe MSD has a newer unit, but the old "ping control" one just shifted the
>whole curve (via a knob). It's pretty crude, but better than nothing. The
>Safeguard is a much better system as it works automatically and does it on a
>per cylinder basis.  Rarely do all cylinders have the same knock limit, so
>why retard the ones that don't need it?
>
>Jim Burkhard

Eric S. Eberhard
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