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Re: Falbelt Video: Crazy Times in the Engine Compartment
Posted by: jimc ()
Date: September 10, 2021 12:23PM

Tim,
What belt gap at the belt guide are you running?

Jimc
1965 Corsa Coupe, two owner history


HACOA Member
CORSA 2017 Concours Senior Gold Award
AACA 2015 Award

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Re: Falbelt Video: Crazy Times in the Engine Compartment
Posted by: aircooled ()
Date: September 10, 2021 01:31PM

jimc Wrote:
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> Tim,
> What belt gap at the belt guide are you running?


That was about 3/16 - 1/4 inch.

Tim
Southern California - Where the stars are on the ground and dirt is in the sky

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Re: Falbelt Video: Crazy Times in the Engine Compartment
Date: September 10, 2021 09:21PM

TheRealHip Wrote:
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> Has anyone done something else with this design. Instead of making the belt do the 90 degree turn?

The low parallel fan is a feature, not a bug!! Designed in to the Corvair engine was a solution to the tall VW cooling fan structure that really limited their future models. Lots of space to be reclaimed by making the fan tight to the engine - As VW later discoverd in their Type III series Station wagon & Fastback with a low load floor due to a complete redesign of the VW air cooling design.

The Corvair belt makes a simple twist as it changes planes across the idler and alternator pulleys.
I and many others have put thousands of enthusiastic miles on our Corvairs without any problems with the belt.
ONE of the key components is a > Rust Free < pulley or harmonic dampner. Rough textures on the pulleys makes for a chaotic belt life.


Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 Corsa 140 Coupe ~ ~ 1965 Monza 140/4 Convertible Sierra Tan/Fawn ~ 1964 Monza Spyder Convertible ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 CoupeEvening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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Re: Falbelt Video: Crazy Times in the Engine Compartment
Posted by: American Mel ()
Date: September 10, 2021 09:28PM

People on here have been talking about VW/Porsche 911 engines, but no one yet has bothered to mention that when it came to serious racing speeds, and efficient cooling, you rarely see a vertical fan on a Porsche Factory Race car. hot smiley

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WA. state, 1 mile south of the Canadian border, I am not at the end of the world, but you can see it from here.

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Re: Falbelt Video: Crazy Times in the Engine Compartment
Date: September 10, 2021 10:09PM

American Mel Wrote:
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> People on here have been talking about VW/Porsche 911 engines, but no one yet has bothered to mention that when it came to serious racing speeds, and efficient cooling, you rarely see a vertical fan on a Porsche Factory Race car
. hot smiley

I presume you are talking about the LeMans winning 917 series 12 cylinder air cooled race engines:



Esentially two 6 cylinder engines combined with a vertical shaft to turn the massive fan. No flimsy belts here!!

Porsche soon went to water-cooled heads and used the fans to cool the cylinders and engine case. Oil was cooled by ram air injection! smoking smiley

This was IMHO the great times of long-distance racing when the regulators were kept quiet and the engineers were creating the amazing legendary sports racers.

Later it became a math game with calculated fuel consumption a large portion of the mix.

This ain't no Economy Run!!



Five-litre Group 5 Sports cars in action 1971


Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 Corsa 140 Coupe ~ ~ 1965 Monza 140/4 Convertible Sierra Tan/Fawn ~ 1964 Monza Spyder Convertible ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 CoupeEvening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468



Edited 1 time(s). Last edit at 09/10/2021 10:12PM by 1966-Corsa-GT-180.

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Re: Falbelt Video: Crazy Times in the Engine Compartment
Posted by: 63turbo ()
Date: September 10, 2021 10:31PM

Yup! theres more than a few VW's and Porsche's that have converted to mule drive, for racing, and dont have the belt tossing problems we see. One guy I talked to has a cut down mag fan on a Porsche 914 and has had zero belts come off in years of racing it. Theres some differences in how those guys do this, vs how we do it... One is the fan speed is lower, by quite a bit, and the hp usage is down quite a lot also. It is pretty typical for those set-ups to be using pulley ratios in the neighborhood of 1.2- 1.4. The alternator, if they have one is usually on its own pulley system and these engines, because they are 4 cylinders dont need a harmonic balancer. Many of these have a plate directly behind the crank pulley which functions as a guide, and the belt enters and exits the crank pulley tangent on both sides, on our set-up theres a built in rearward offset on the alternator pulley and a slight forward offset leading to the idler from the crank. Since the hp usage of their fans and set-up is so low, they dont have to use belt slippage like many of us do (or did, when I had a mag fan) so belt control is better by being tighter. Lots of seemingly little details, but they do add up.
why do they go to the hated/much maligned mule drive??? Airflow distribution is way better! and much less expensive than the 90 degree gear drive used on the factory Porsche racers.

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

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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