l Fox <paulvair@yahoo.com> Subject: Re: <VV>Octane/Ping

[Eric S. Eberhard]

I like that -- all engines are air cooled :-)  However, in boats this is 
not true, so all CAR engines are air cooled is more accurate!

At 02:51 PM 6/23/2005, Padgett wrote:

>>  It would be nice if you could get a Corvair to work at 9 to 1 on 87 
>> octane. Maybe when the engine is fresh with no carbon build up. I think 
>> the air cooling will keep you from the ideal temps for this.
>
>When you get down to it, all engines are air cooled, just some use water 
>(coolant) as an intermediate step. The key is to be able to cool the 
>engine below where you want it to run and then be able to stabilize it at 
>the temperature you want. After all, a Harley Sportster 883 has about the 
>same cyl size as the Corvair.
>
>At first glance the Corvair seems backwards, because at speed you have a 
>high pressure area under the floorpan and a low pressure area over the 
>rear deck. I realize that is how VW did it but the shape was entirely 
>different.
>
>If going to push air down, I would think an air dam under the back seat 
>and a rear spoiler would be useful to reverse the pressures.
>
>I also have to wonder just how much hp is used for the fan at a 70 
>mph/3500 rpm cruise (either electrics of a CVT drive would allow constant 
>fan flow: with a bit of reprogramming, my computer cars run 181-185F even 
>in hot for Orlando weather.
>
>Just as an aside, are 3.08 gearsets considered valuable for anything ? 
>Since a big hunk of the cooling issue is IHP losses, keeping the revs low 
>can really help (odd thing is that back at GMI, people thought I was crazy 
>promoting very steep axle ratios for low rpm cruise but as far as I was 
>concerned it was a win-win situation. My test bed then was a 327-275 hp 
>Camaro (because I had it) with a 4-speed and Rochester FI. using very tall 
>tires (H78-15) to keep the revs down on Interstates. Could of gone furter 
>but never found a B-W o/d to mate with a Saginaw 4-speed.
>
>Padgett
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Eric S. Eberhard
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