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Delrin Fan?
Posted by: Kamaka ()
Date: April 28, 2017 07:10PM

I've heard that at one point, I believe 1962, that Corvairs had a Delrin Plastic cooling fan and were recalled because of the plastic emitting poisonous gasses when exposed to the battery vapor.

The question did they ever really make it into the hands of consumers and if so has anyone ever seen one?

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Re: Delrin Fan?
Posted by: MattNall ()
Date: April 28, 2017 07:22PM

Never in production IIRC... but there are pictures...





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Re: Delrin Fan?
Posted by: davemotohead ()
Date: April 28, 2017 08:18PM

smoking smiley



Email me at: Dave Motohead

Sign my guest book!
[motoheadmall.com]
-----------------------------------
Rust Free Lancaster Ca

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Re: Delrin Fan?
Posted by: veverlove ()
Date: April 28, 2017 08:59PM

I heard it through the grapevine that R&D is being conducted on a composite fan (glass impregnated polymer?), but haven't heard anything since. Interesting design, similar to a turbo impeller. With today's 3D printing I should think designing/creating a prototype would be relatively (my caveat) easy for someone with the necessary technical skills.

Dave - Has to be from a museum. My guess would be the CPF?

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Re: Delrin Fan?
Posted by: dragvairclark ()
Date: April 29, 2017 03:53AM

I had one of these. I believe I gave it to Dave Newell.

Clark Hartzel, Fraser, MI
1965 Monza coupe

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Re: Delrin Fan?
Posted by: gnvair ()
Date: April 29, 2017 05:21AM

Would be hard to make one lighter than the magnesium fan. Any weight savings composite might add is negated by the resin to hold it together. Most of the racers are switching to up right fans.

Lee J
Southern New Jersey near Philly.
1966 Corsa 180/4 speed
1969 Monza convertible 140/4 speed

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Re: Delrin Fan?
Posted by: BobV66Vair ()
Date: April 29, 2017 02:33PM

I know someone who is working on a billet aluminum fan that will blow more pressure and air than the stock. Idea is to improve cooling enough that the engine won't be so susceptible to overheating. The trick, as I understand it, is to get a lot more airflow without using a lot of horsepower. Something like a turbo blade.

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: Delrin Fan?
Posted by: MattNall ()
Date: April 29, 2017 05:09PM

Afew have been in Development for over a decade!





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Re: Delrin Fan?
Posted by: BobV66Vair ()
Date: April 30, 2017 10:09AM

There is a fully machined prototype already, going to test for airflow very soon. Interesting stuff, trying to improve on GM. There is just a brick wall for the Corvair. So many really good innovations over the decades that I am happy to take advantage of today. Hats off to those who have been working on this over those decades. I saw a study, by GM I think, that showed the HP required to increase the Corvair's speed at the upper end. The aerodynamics are so poor that it takes a massive amount of HP to get small increases. A brick comes to mind. There is a terminal speed that the aerodynamics will allow. Beyond that there is no real return for the increased weight required to add the HP.

I think GM designed it to look like a car with a radiator and engine in the front so it looked more "normal" in the day. There were no American cars with really good aerodynamics in those days. Some European cars but they were not really considered by American designers, at least none that got past the board of directors.

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: Delrin Fan?
Posted by: Seth Emerson ()
Date: April 30, 2017 05:14PM

Tom Keosbabian (SP?) had one of the plastic fans.

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Re: Delrin Fan?
Posted by: jmaechtlen ()
Date: April 30, 2017 09:31PM

Well - for a passenger car, there are a set of priorities and tradeoffs.
50 years of technology, and a somewhat different set of priorities, might lead to a different design or two.

As far as body aero, our lakes racers (including Keosabian) may have some suggestions there. it seems 170+ is possible...

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Re: Delrin Fan?
Posted by: MattNall ()
Date: April 30, 2017 09:48PM

Read!! "Living with the World's Fastest Corvair"


And the Clean-Air Corvair---faster at Bonneville

No aero on this either







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Re: Delrin Fan?
Posted by: BobV66Vair ()
Date: May 01, 2017 08:39AM

Tom's propane car is the same engine as his first Bonneville winner, he just changed it for Propane. At least that's what he said in an interview I saw. My point was that there are limits to how fast a Corvair can go due to aerodynamics. Clearly that has not been achieved yet by a real car but I suspect it is getting pretty close. Maybe with some increases in HP it will be soon by one of our contributing members!

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: Delrin Fan?
Posted by: gnvair ()
Date: May 01, 2017 10:05AM

BobV66Vair Wrote:
-------------------------------------------------------
> Tom's propane car is the same engine as his first
> Bonneville winner, he just changed it for Propane.
> At least that's what he said in an interview I
> saw. My point was that there are limits to how
> fast a Corvair can go due to aerodynamics. Clearly
> that has not been achieved yet by a real car but I
> suspect it is getting pretty close. Maybe with
> some increases in HP it will be soon by one of our
> contributing members!


Look up Charlie Friend's Silverstate Classic Corvair. Lots of videos and pictures. I believe he has been about 190 with his. I'm sure someone knows more details.

Lee J
Southern New Jersey near Philly.
1966 Corsa 180/4 speed
1969 Monza convertible 140/4 speed

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Re: Delrin Fan?
Posted by: MattNall ()
Date: May 01, 2017 10:49AM

I do his webpages... 217 so far.. but has aero nose and chopped top.

Charlie Friends open Road racer 406 sbc





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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Re: Delrin Fan?
Date: May 02, 2017 12:30PM

In deference to mr. Keosabian his 171mph car is still Corvair powered.

Lon
www.corvairunderground.com

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Re: Delrin Fan?
Posted by: BobV66Vair ()
Date: May 02, 2017 01:06PM

That's a Corvair body over a big Chevy engine and a Frankenstein drive train. Sorry, I am OK with major hot rod changes to the cars, even some of the V8 machines but I don't think you can compare a V8 to the flat 6 of the Corvair. Not a fair comparison. No knock on the owner or others that want to do that. Hot rodding is all about individual choices, and funding.

As to my earlier point about the aerodynamics of the Corvair creating a wall that can't really be passed, it's still valid. The car in the link was able to increase the walls speed but at what cost? Notice the picture of the car after running the course?

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: Delrin Fan?
Posted by: MattNall ()
Date: May 02, 2017 01:36PM

NEW Michelin RF tire blew....





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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Re: Delrin Fan?
Posted by: Phil Dally ()
Date: May 02, 2017 05:39PM

The fastest speed ever put down by a stock configuration Corvair is 187+ mph.

This was accomplished by Ron Cohn in the seventies at the Bonneville Salt flats.

He could not back it up as he had run out of pistons...but it is the fastest ever.

If you need verification Tom K will back up the story as he was there when it happened.

Tom K's F/CBGC 173.090 mph is the only Corvair left in the SCTA-BNI record book.

There were many Corvairs in the record book until fuel was separated from gasoline.

At that time all of the records were nullified and everybody started from scratch.

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Re: Delrin Fan?
Posted by: MattNall ()
Date: May 03, 2017 05:53PM

Back to original topic:

As Seth stated Tom K. has one the was on Devin SN2 along with the only set of Front Disc brakes! Run on a Turbo Engine..... going back on to that engine which will go back in the car....He's been invited to the "Quail Concours" [ ???] Monterey in Sept.

It is 14 OZ.... 3 Oz.lighter than the Mag fan.... Oh, and the Mag fans in '64 from the Dealer?? $4 !!!

We had a "Low Tea" yesterday... Not a "High Tea"....non-Brits will have a ball with that!

I asked Tom for a"Cheshire Cat Grin" Oh well

OH, that a NEW NOS NEVER INSTALLED MAG FAN for those that wondered about original finish!



Edited 1 time(s). Last edit at 05/03/2017 06:19PM by MattNall.

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