<VV> Early vs Late Fan
Mel Francis
mfrancis at wi.rr.com
Sat Mar 3 17:07:27 EST 2012
The California tests used a flat fan attached to the top of the shroud. That doesn't direct air outward radially, like a Corvair fan does, so yes, that approach doesn't work.
This test uses an electric motor attached to the stock Corvair fan with a belt and pulley.
Photo: http://www.flickr.com/photos/mel_francis/6582973759/in/set-72157628474177583
Mel
----- Original Message -----
From: Ron
To: Mel Francis
Sent: Saturday, March 03, 2012 3:49 PM
Subject: Re: <VV> Early vs Late Fan
Surely you remember the tests done on that California car several years ago! They proved that it doesn't work so now you want to reprove it?
RonH
----- Original Message -----
From: Mel Francis
To: Ron
Cc: virtualvairs at corvair.org
Sent: Saturday, March 03, 2012 1:33 PM
Subject: Re: <VV> Early vs Late Fan
"As almost everybody knows", electric fans on the Corvair engine don't work, but I decided to give it a try anyway, in the Monza SS, which is just an experiment anyway. I have a big motor and the setup is in its early stages of development. I wanted to keep it really simple at first, seeing just what head temps I would get under real-use conditions, with a single speed fan. A variable speed control will evolve later.
If top fan speed doesn't cool the car under this coming summer's hottest traffic conditions, I can easily hook up the belt again. So far, the head temps appear to stabilize at around 350F, no matter how far I drive. Remember, this light sportscar has the direct-air cooling duct from the nose, so whatever results I achieve, may not transfer over to a full-size Corvair.
My engine has the lower shrouds removed, so there's no buildup of pressure against the fan as the engine revs higher, which you get with thermostatically-closed lower shrouds.
Mel Francis
----- Original Message -----
From: "Ron" <ronh at owt.com>
To: "Mel Francis" <mfrancis at wi.rr.com>; <ScottyGrover at aol.com>
Cc: <virtualvairs at corvair.org>
Sent: Saturday, March 03, 2012 3:03 PM
Subject: Re: <VV> Early vs Late Fan
> As almost everybody knows, you need a big motor for that and you don't want
> a constant speed fan on a variable speed engine as the cooling load varies
> with the engine speed, more or less.
> RonH
> .
> RonH
>
> ----- Original Message -----
> From: "Mel Francis" <mfrancis at wi.rr.com>
> To: <ScottyGrover at aol.com>
> Cc: <virtualvairs at corvair.org>
> Sent: Saturday, March 03, 2012 10:47 AM
> Subject: Re: <VV> Early vs Late Fan
>
>
>>I don't see it happening at all. Way too expensive...
>>
>> My focus recently, has been on the LM fan spun at a constant RPM
>> by a thermostatically controlled electric motor and so far, that seems
>> to offer a good compromise, since there are no fan speed changes at all,
>> during shifting. I might even try an early fan hooked up to the motor.
>>
>> Mel
>>
>> ----- Original Message -----
>> From: <ScottyGrover at aol.com>
>> To: <fastvair at yahoogroups.com>
>> Cc: <virtualvairs at corvair.org>
>> Sent: Saturday, March 03, 2012 12:12 PM
>> Subject: Re: <VV> Early vs Late Fan
>>
>>
>>> so, Mel, when are you going to reproduce the early fan in fibreglass- or
>>> carbon-impregnated resin?
>>>
>>> Scotty from Hollyweird.
>>>
>>>
>>> In a message dated 3/3/2012 10:07:58 A.M. Pacific Standard Time,
>>> mfrancis at wi.rr.com writes:
>>>
>>> The lighter, late fan design, resists fan belt tossing better than the
>>> early
>>> design.
>>>
>>> While the early fan does flow a bit more air, it is a bunch heavier and
>>> its
>>> inertia
>>> causes the belt to stretch, then bunch up during fast gearchanges.
>>>
>>> Mel Francis
>>>
>>> ----- Original Message -----
>>> From: "Bob Gilbert" <bgilbert at gilberts-bc.ca>
>>> To: <virtualvairs at corvair.org>
>>> Sent: Saturday, March 03, 2012 11:46 AM
>>> Subject: <VV> Early vs Late Fan
>>>
>>>
>>>> Hi,
>>>> Other than the different hole in the middle and the retaining bolts on
>>>> a
>>>> different radius are there any other differences between an early and a
>>>> late
>>>> fan? I have a friend who could drill out the main hole for me plus
>>>> drill
>>>> new
>>>> holes in my early fan/pulley to make it fit my late bearing hub.
>>>> Before I say yes, is there any reason that I shouldn't do this?
>>>> Thanks,
>>>> Bob
>>>>
>>>>
>>>>
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