<VV> Not expected to last

[jvhroberts at aol.com]

Funny, the last 911s had OBDII, and passed with flying colors! Fits? Nah. Remember, the forst EFI cars were air cooled, and I don't EVER remember Bosch having any problems specifically with VW or Porsche air cooled engines. The reason you stated is NOT why Porsche stopped with air cooled engines. The reason? Too hard to cool air cooled 4 valve heads, and with power levels ever rising, they kept running into cooling limitations. Also, the wet engines are quieter, get better fuel mileage, and are less expensive to build. 

And the alloy can be found out, with some judicious research. 


-----Original Message-----
From: ScottyGrover at aol.com
To: JVHRoberts at aol.com
Cc: kenpepke at juno.com; virtualvairs at corvair.org; fastvair at yahoogroups.com
Sent: Thu, 6 Mar 2008 4:43 pm
Subject: Re: <VV> Not expected to last




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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