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I now the riechert set up for type 4 engines.
But is someone making the 911 flat cooling via a horizontal axle via a poulie and v belt.

Like to know.

Regards eddie

I built a Horizontal fan setup years ago but its Corvair based and does not need a $1000 worth of Porsche parts.
Have recently asked for help from someone who makes T1 fans... out of reinforced plastic, the Corvair folks could also use a more reasonably priced, better performing solution.

A slightly cut down Corvair magnesium fan will work on a T4 but its ~impossible to find one not cracked at the blade root on the outer 3rd of the fan. That has prevented me from further work so far.

You mean like in the 934/935?
Sadly no, but would be very cool though!
I know Jim Torres Racing is making replicas in the USA for the 911's.

Regards,
Richard

I too would like to switch to a horizontal fan on the type 4 engine in my street Buggy. At present I am using the stock Bus cooling system and it is not ideal for this car in my view. Being low and facing the rear it brings in too much road dust and also some exhaust and spent cooling air. An upright conversion would be better but space above this engine with it's Weber carbs is already at a premium. Serviceability would suffer even more than it does now.

The Porsche fan is as others have said, priced out of reasonable reach. I also wonder if it is the right choice. The airflow off it will be going mostly down and would naturally favor the engine case and cylinders, the heads getting whatever is left over. Unless of course it is mounted fairly high up with long sloping sides to the shroud. The Corvair fan throws the air off horizontally and favors the heads. In the case of the type 4 engine this configuration would also favor the stock oil cooler location. To me those are the parts of the engine that have the highest cooling requirement. With that in mind would not the stock type 4 fan be better or is the diameter too large? How about the type 3 fan or even the type 1 fan?

With the air coming off the fan horizontally the fan could be mounted very close to the engine case making for a more compact design. In my car the alternator could stay where it is, the fan removed and relocated and a second pulley added to the crank to drive it. The majority of the cooling air would then be coming from over the transaxle and from the wheel wells instead of from behind the car.

Andrig's first version plastic type 1 fan interested me for this purpose because it's light weight would help immensely with the issue of keeping that long belt from coming off. However it seems the fan was prone to failure at the base. The second version was reinforced in that area but he has abandoned the design for a different one now.

I can't seem to get the idea out of my mind that his first version would have been a winner if he had shaped the blades more like the compressor wheel on a turbo. That would have put more meat into the lower 1/3 of the fins to strengthen the hub area and it also could have increased the aerodynamic efficiency I think.

Hi Eddie!

You mean like one with bevel gears(haakse overbrenging)?-only for 6cyl porsches and they are cubic Dollars.A new winter project for you-maybe using a gearset of an (big)angle grinder or a bevel gear out of an outboard engine?
The setup in the video is 25K$...

https://youtu.be/_EQAtpxw_Oo?si=MfXrMpOQNsTyNbWV

Thanks for the reply s guys.

Richie wrote: ↑Tue Oct 29, 2024 1:42 am You mean like in the 934/935?
Sadly no, but would be very cool though!
I know Jim Torres Racing is making replicas in the USA for the 911's.

Regards,
Richard

Holy ....., this is what I meant yeah...
But the price is out off this world.

Regards Eddie

Arnoud wrote: ↑Tue Oct 29, 2024 7:44 am Hi Eddie!

You mean like one with bevel gears(haakse overbrenging)?-only for 6cyl porsches and they are cubic Dollars.A new winter project for you-maybe using a gearset of an (big)angle grinder or a bevel gear out of an outboard engine?
The setup in the video is 25K$...

https://youtu.be/_EQAtpxw_Oo?si=MfXrMpOQNsTyNbWV

flatfan.jpg

Yep this is what I meant... but did not realise it would be this expensive.

Well this idea is out off the window.

A long v-belt and a couple extra pulleys on a bracket works well, the belt tossing issues on Corvairs was solved decades ago.
Trying to dig up the more or less complete mockup I posted ~15 years ago.

Pile those long belts pull horsepower.

Passatman, the fans draw 15-20 HP at redline. (Including T1s)
The loss in the belt is in the noise.

Jeeez, shows how time flies, haven't looked on here for so long, missed quite a few posts..
Belt throwing is not an issue, and you can build it yourself if you're good with tools & metalwork.
Driving this setup since 2014, replaced the belt once.

News on slightly smaller diameter vs. stock Corvair fan prototype ... Will post pics one it's here and home on cleaned up housing etc. Setup is for T4. super lightweight and ~same price as a quality welded/balanced T1 fan.

Typ 4 wrote: ↑Fri Feb 07, 2025 11:35 am Jeeez, shows how time flies, haven't looked on here for so long, missed quite a few posts..
Belt throwing is not an issue, and you can build it yourself if you're good with tools & metalwork.
Driving this setup since 2014, replaced the belt once.

Post up pics~ Need motivation!!

Orratech in germany sell a long belt flat fan kit. Its “all the money” but does include a 964 style fan machined to a smaller size (that alone with alternator is €1.5k)