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Otto Variable Fan Belt
Posted by: SoloCP ()
Date: September 18, 2021 10:08AM

Does anyone have a part number for a replacement belt for a Otto Fan Pulley.Also what is the best ratio to run on a Autocross Car turning 6200 to 6500 on shifting
Thanks

Don
AKA (Polyvairist)
Kansas City
HACOA
Broken Halo Corvair Garage
62 Rampside
62 Corvair Coupe (Flicka)
64 Spyder Coupe (Bill Pierson Car)
64 Monza Convertible,140/4 Speed,Electric Heat,Kelsey Hayes Wheels
64 Spyder Blown, (Dave Bolduc Car)
65 Corsa Convertible Triple Black, 140/4 Speed with A/C (aka Blackie)
65 Corsa 3.1 Liter Triple Weber (aka Unsafe)
66 Corvair V8 SuperVair (Created by Archibald Evans)
66 Avenger, Corvair Turbo, Fuel Injected, Air to Water intercool 140. (Michael Mann Car)

Re: Otto Variable Fan Belt
Posted by: 63turbo ()
Date: September 18, 2021 10:28AM

For autocross, 1.2 is the only ratio to consider, unless the course is long enough
that cooling is a consideration... usually not.

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

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
Test Start#2 [www.youtube.com]



Re: Otto Variable Fan Belt
Posted by: SoloCP ()
Date: September 18, 2021 12:06PM

Set at 1.32 now. Just installed this. Took off the spring tensioner. Running stock pulley now with belt guide at fan off set because of the size of the variable pulley. Belt guide at pulley. Belt tension set so i can turn alternator with my finger

Don
AKA (Polyvairist)
Kansas City
HACOA
Broken Halo Corvair Garage
62 Rampside
62 Corvair Coupe (Flicka)
64 Spyder Coupe (Bill Pierson Car)
64 Monza Convertible,140/4 Speed,Electric Heat,Kelsey Hayes Wheels
64 Spyder Blown, (Dave Bolduc Car)
65 Corsa Convertible Triple Black, 140/4 Speed with A/C (aka Blackie)
65 Corsa 3.1 Liter Triple Weber (aka Unsafe)
66 Corvair V8 SuperVair (Created by Archibald Evans)
66 Avenger, Corvair Turbo, Fuel Injected, Air to Water intercool 140. (Michael Mann Car)

Re: Otto Variable Fan Belt
Posted by: 63turbo ()
Date: September 18, 2021 01:46PM

One of the other reasons to use the 1.2 or 1.25 ratio (with the "long" belt) besides lower power usage is that the idler pulley will end up way too forward with the 1.32. Also, the 1.2 ratio will have the fan belt height exactly the same as the stock pulley will. All of the other ratios mess with that belt height, and increase the chances for the belt coming off.

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

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
Test Start#2 [www.youtube.com]



Re: Otto Variable Fan Belt
Posted by: MattNall ()
Date: September 18, 2021 01:57PM

For AX.... I would think the LeVeque 1/2 speed system would be best.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

Re: Otto Variable Fan Belt
Posted by: 63turbo ()
Date: September 19, 2021 10:17AM

The bugger when they get geared down that far is that the car has to be towed
to the course because the low rpm cooling is so poor. when they are fitted with a Nashfan, the car can be driven there, and if so desired, replace the stock pulley ratio with a 1.2:1 pulley and use less hp than a 1/2 speed pulley set-up can do (with the stock fan) then put the stock pulley back on and drive home spinning smiley sticking its tongue out

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

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
Test Start#2 [www.youtube.com]



Re: Otto Variable Fan Belt
Posted by: 66vairman ()
Date: September 19, 2021 11:37AM

SoloCP Wrote:
-------------------------------------------------------
> Does anyone have a part number for a replacement belt for a Otto Fan Pulley.Also what is the best ratio to run on a Autocross Car turning 6200 to 6500 on shifting
> Thanks

Is this what your are looking for ---- [losangeles.craigslist.org]

Not my part, I just saw the ad.

Re: Otto Variable Fan Belt
Posted by: MattNall ()
Date: September 19, 2021 01:19PM

Nope, he wants the Belt PART NUMBER!!

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

Re: Otto Variable Fan Belt
Posted by: 63turbo ()
Date: September 19, 2021 02:19PM

The Clarks number for the variable ratio pulley belt is here:

[ssl.corvair.com]

If you were wanting to try a 1.4 pulley ratio, there is a metric length 3/8
width belt that will work slick with that pulley ratio, but I dont know what the
part number is. It is longer than the 56" stock belt, and shorter than the Otto
"long" belt.

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

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
Test Start#2 [www.youtube.com]



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