<VV> Early vs Late Fan

[Mel Francis]

"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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>>>
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