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Nash Fan installation, testing, and feedback thread
Posted by: ral1963 ()
Date: May 16, 2020 06:17PM

I wanted to start a new thread just for installation, testing, and other general post design info.

If you want the full history and development progress thread..click below to catch yourself up…

Original "My New Fan" Thread

Otherwise let’s start an general info thread to continue to build on.

I wanted to get some basic information out of the way…I weighed my fan on my food scale and mine came in at 664 Grams. I imagine that there will be some variance fan to fan but it should be marginal.

I dug around my parts stash and I couldn’t find a full sized mag fan to weigh, just a cut down Yenko fan.

If someone has a sensitive enough scale to measure a stock LM magnesium fan, please do so and post it on this thread.

And for reference, the cut down Yenko fan weighed in at 416 grams.

I also weighed my Alum fan pulley and it weighed in at 166 grams. I didn’t have a stock pulley laying around either, but if someone does, and can weigh it, that would be great as well.


I am working all weekend, but hope to have some time to work on the car this upcoming week. I am making a 2 piece top shroud to easily swap out the stock fan to the Nash fan within minutes for some back to back road tests from my Vair. I have Dual CHT gages and want to run the same roads both directions and record my head temps between the 2 fans and with and without the bell vane in place.

Rick Loving
Corvair historian & chronicler of useless facts
CORSA
Performance Corvair Group
Chicagoland Corvair Enthusiasts

RAL1963@COMCAST.NET
Just south of Chicago IL

Current Ride
63 Sprint Vert 140/4sp

Past Rides
60 700 Sedan 80hp PG
63 Monza Vert 102hp 4 spd
63 Monza Coupe 140hp 4 spd
63 700 Sedan 80hp 3 spd
64 Monza Vert 110hp 4 spd
64 Monza Coupe 95hp 3 spd
64 Monza Sedan 110hp PG
65 500 Coupe 95hp 4 spd
65 Monza Coupe 110hp PG
65 Corsa Coupe 140hp 4 spd
66 Turbo Coupe 180/4sp
68 Monza Vert 140hp 3 spd

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Re: Nash Fan installation, testing, and feedback thread
Posted by: 63turbo ()
Date: May 16, 2020 07:25PM

A stock, unpainted mag fan should weigh around 544 grams, or 1.2 lbs. What would be interesting is to see if you can feel a difference in inertia between the stock fan, Nashfan and your cut down one. All it amounts to doing is grabbing each fan at its center and as hard as you can manage, rapidly twist the fans back and forth. The level of effort you feel is an indication of inertia differences. I tried this with my .7 lb nylon printed prototype and compared it with my stock mag fan, and although there was a difference, it was actually suprising to me as to how small the difference actually was, especially considering the huge weight difference! Cool test you are doing by the way!!

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car






Edited 1 time(s). Last edit at 05/16/2020 07:25PM by 63turbo.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: Phil Dally ()
Date: May 16, 2020 07:27PM

"If" we ever have another meet at El Mirage...waiting on Comrade Newsom.

Dwight and I will deliver a full report from the over 150 mph world.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: jetcat ()
Date: May 17, 2020 06:00AM

So far so good but still incomplete. I put the Nash fan in using my stock pulley for now. I set the shroud clearance at 0.090" by lifting the fan bearing and using the included shim. When I first ran the engine, I was standing behind the car wearing shorts and thinking, damn, one of my thermostats wkas stuck open. It was fine, that was how much air was coming from the left side door that's normally open a crack.
I have a dual CHT gauge that is ambient temperature compensated and it maxed out at L= 375°, R=350° yesterday cruising at 65 mph on a 85° day.
The mag fan I took off the engine was heavy because I power coated it....

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: larry202br ()
Date: May 17, 2020 07:33AM

jetcat Wrote:
-------------------------------------------------------
> So far so good but still incomplete. I put the Nash fan in using my stock pulley for now. I set the shroud clearance at 0.090" by lifting the fan bearing and using the included shim. When I first ran the engine, I was standing behind the car wearing shorts and thinking, damn, one of my thermostats wkas stuck open. It was fine, that was how much air was coming from the left side door that's normally open a crack.
> I have a dual CHT gauge that is ambient temperature compensated and it maxed out at L= 375°, R=350° yesterday cruising at 65 mph on a 85° day.
> The mag fan I took off the engine was heavy because I power coated it....


What were your temps before the fan change?

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door 180 Turbo.

KC0SKX
Olathe, ks
HACOA

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Re: Nash Fan installation, testing, and feedback thread
Posted by: jetcat ()
Date: May 17, 2020 08:24AM

Too many changes since I last ran the engine with the original fan to compare. The temps that I am measuring are quite accurate though. I have the same CHT setup in my 110hp coupe with a stock fan and it would measure about the same under those conditions. However, the 110 head thermocouple port is not in the same position as the turbo head and does measure cooler because of that.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: 63turbo ()
Date: May 17, 2020 10:17AM

Bob... Nice install!! sheesh that is clean looking!! it looks like your injectors are not hooked up yet?? also, although your temps look a touch high still, compared to a stone stock turbo at those kind of ambient air temps, and speeds, it seemed like 400 was more like it. Also, given that all my freeway tests were done with "intake mods" (airflow pulley, bells and guidevane bells) and my temps were quite a bit lower, this might be indicative of the kinds of intake losses I found.
Super interesting first peek and impressions though!!!

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: Nash Fan installation, testing, and feedback thread
Posted by: jetcat ()
Date: May 17, 2020 01:23PM

Hey Kevin, the max temps were 375/350. <400... Even though I was only crusing at 65 it was up a fairly steep grade with me cycling the throttle trying to seat in the rings. It's a pretty tight engine as well (< 2hrs run time). I'm not really ready yet to evaluate much yet till I get everything sorted out. BTW, my previous engine never would run under 425+++ under the same conditions. It had several issues however.

Since I had the engine rebuilt and knew the carburetor kinda worked, I thought it would be best to run it stock to break it in. Everything for the EFI is installed and working except for the fuel rails. The machinist making them is busy right now making pulleys I think grinning smiley. I use the EFI to run the fuel pump but feed the carburetor with the return line (@2 PSI). I can monitor the O2 sensor with the EFI terminal that works out to be helpfull.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: ral1963 ()
Date: May 17, 2020 03:50PM

Just for future information, can you weight your powder coated Mag fan...once I pull mine I will weight it and we can then also see the difference between coated and non-coated fans.

I still need the weight of a stock pulley if anyone has one laying around?

Rick Loving
Corvair historian & chronicler of useless facts
CORSA
Performance Corvair Group
Chicagoland Corvair Enthusiasts

RAL1963@COMCAST.NET
Just south of Chicago IL

Current Ride
63 Sprint Vert 140/4sp

Past Rides
60 700 Sedan 80hp PG
63 Monza Vert 102hp 4 spd
63 Monza Coupe 140hp 4 spd
63 700 Sedan 80hp 3 spd
64 Monza Vert 110hp 4 spd
64 Monza Coupe 95hp 3 spd
64 Monza Sedan 110hp PG
65 500 Coupe 95hp 4 spd
65 Monza Coupe 110hp PG
65 Corsa Coupe 140hp 4 spd
66 Turbo Coupe 180/4sp
68 Monza Vert 140hp 3 spd

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Re: Nash Fan installation, testing, and feedback thread
Posted by: jetcat ()
Date: May 17, 2020 03:58PM

My powder coated fan weighs 570 grams.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: Nash Fan installation, testing, and feedback thread
Posted by: bmarsh52 ()
Date: May 18, 2020 04:42AM

That is a really great looking engine. I particularly like the color of the turbo and pipe.

What coating did you use on your exhaust housing and down pipe?

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Re: Nash Fan installation, testing, and feedback thread
Posted by: MonzaDave ()
Date: May 18, 2020 09:11AM

One of my stock LM uncoated -- but a bit dirty -- fans weighs 493 grams.

Dave Keillor
Rochester, MN

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Re: Nash Fan installation, testing, and feedback thread
Posted by: jetcat ()
Date: May 20, 2020 06:31AM

My stock pulley power coated is 274 grams

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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