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Old 09-14-2019, 07:51 PM
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Default L78 Nova fan noise.

I have a 70 Nova L78 that is all stock and sounds normal. I have had a number of L78 Novas and a few of of them had quite a loud howl that sounded like a truck. I didn't think there was anything wrong and never really searched to see where it comes from. This car I have now has what looks to me to be a stock shroud and 5 blade fan with no thermal clutch. It runs great and I sort of miss that howl. I have never heard the same sound from any other Camaro or Chevelle with a L78.
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Old 09-14-2019, 08:26 PM
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Post 5 Blade Nova BB Fan...

The 'howl' as you call it is standard equipment for these fans...they all do it.

Back in the day the noise was the reason a lot guys went with a flex-a-lite unit...the noise got to them.

No need to worry...if folks ask about the noise, just tell them you have a mini-blower installed and don't open the hood


-wilma
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Old 09-15-2019, 03:10 AM
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Quote:
Originally Posted by WILMASBOYL78 View Post
The 'howl' as you call it is standard equipment for these fans...they all do it.

Back in the day the noise was the reason a lot guys went with a flex-a-lite unit...the noise got to them.

No need to worry...if folks ask about the noise, just tell them you have a mini-blower installed and don't open the hood


-wilma
Thanks.The problem is mine doesn't do it.Do all L78s use a 5 blade fan?
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Old 09-15-2019, 03:35 AM
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Default Fan noise

Tom
Why do L-78 novas have the fixed blade only and all other L-78 models have fan clutches???
Thanks in advance
Mike
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Old 09-15-2019, 10:53 AM
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Because there's no room for it between the water pump and the radiator,like other vehicles that used a fan clutch.
The 7 bladed fans use the clutch and it needs more space.
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Old 09-15-2019, 12:45 PM
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Post 5 Blade Nova BB Fan...

Quote:
Originally Posted by rts View Post
Tom
Why do L-78 novas have the fixed blade only and all other L-78 models have fan clutches???
Thanks in advance
Mike
As noted, the space is the issue...the first year of the big block Nova [1968] used the short water pump with a clutch and 5 blade fan...that was the only year for that setup.

And despite what the 'repop catalog' guys show on their websites, there was never a spacer between the fan and water pump on the 69-70 cars. As for the lack of noise...?? hard to answer that one...maybe post a photo of the fan blade so we can see what you got.
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Old 09-15-2019, 03:01 PM
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There are several GM versions of those 5 blade heavy metal non-flex fans. Some have more of an aggressive pitch than others, that were installed on 70-72 small and big block trucks. Someone might have put one of those on, trying to pass it off as the correct fan (you have to look close at them).
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Old 09-17-2019, 01:32 AM
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Here are some pics.Hard to really get good ones.

https://www.kijiji.ca/v-view-details...dId=1460372449
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Old 09-17-2019, 02:00 AM
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Looks like a painted flex fan.
The blades don't look correct at all
Just my 2 cents
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Old 09-17-2019, 02:36 AM
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fan not correct in my opinion.
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