<VV> Not expected to last
ScottyGrover at aol.com
ScottyGrover at aol.com
Thu Mar 6 16:43:13 EST 2008
In a message dated 3/6/2008 1:15:06 P.M. Pacific Standard Time,
JVHRoberts at aol.com writes:
Answer? Look at how the last of the air cooled 911 engines were made.
In a message dated 3/6/2008 2:15:00 PM Eastern Standard Time,
ScottyGrover at aol.com writes:
Ken,
If you were designing the Corvair in present time, what aluminium alloy
would you use for the cylinder head; or for that matter, would you still
use
cast-iron for the cylinders, or some kind of specially heat-treated
aluminium?
Scotty from Hollyweird
Now John, you know that I've seen pictures of the 911 head (I think it was
you that sent them to me) but I don't know what alloy was used in their
manufacture. And I was trying to get a serious answer as to what would be used in
2008 to do the design if someone was re-designing the Corvair engine. I do
know that air-cooled engines give engineers fits trying to set up a
pre-ordained memory map for the ECU, that's why they aren't made by VW or Porsche.
But that's not the only way to use digital technology for modern EFI; an
analogue-to-digital converter following analogue processing of the data from an
air-flow sensor, temperature and pressure sensors, then digital processing using
a narrow-band oxygen sensor to set up pulse-width modulation of an injector
system with a series of down-counters (one for each cylinder.) This has been
done without microcontrollers but would be more parts-efficient using a micro.
Scotty from Hollyweird (with multiple breadboards)
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