Horizontal posrche cooling

[Bruce.m]

Also, in instagram today. A company has produced a short version of the 934 design to fit the Flat 4 Polo engines (shortened 911 engine, with a new crankcase, crank etc these days).

If you have a crazy budget, it might fit.

[Arnoud]

That is pretty cool!One day-when I win the lottery...

[Typ 4]

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!!

Sorry, it's been a while

[Piledriver]

Sweet!
Actually bought/have custom Corvair fan (slightly smaller to fit T4 available area) fan from Andrig Miller, as well as Andrigs T1 fan (original style as tested/used by FJCamper) weighs ~about nothing.. shipping box was far heavier than both fans combined.

Looking for my t4 pulley/belt guide/mount setup, have ...too carefully put it away, think it was from Reichert, bought it from Don years go. hope to get it done before it gets too hot.

[Typ 4]

How does the corsair setup distribute the air? The Porsche fans push it straight down, but with the corsair would you have to fit deflectors to guide it to the centre, to the cylinders?

[Piledriver]

Corvair used a low profile radial fan, it pushes air out the sides and makes good pressure.
This fan was somewhat custom job but would drop in a 65+ Corvair very nicely.
Andrigs T1 fan is also a straight blade radial, the one I have is the ~original like FJCamper tested.

The Porsche fans move a lot of air, but T4s and Corvairs are unlike 911 Porsche engines with lots of free flowing cooling fin area, axial fans great for flow, not pressure.

When I get up this afternoon will dig out and post pics, gotta crash.

[Typ 4]

Cool (no pun intended) looking engines these Corvairs

I can imagine why they (Corvair) had issues with belt tossing.
Don't these engines run counter clockwise? Instead of having an alternator/fan only, there is a generator installed as a deflector pulley. With fast rpm changes, there is drag in exactly that area.

The Peugeot 304 had an alternator sitting 90° offset from the crank, however, they only had deflector pulleys and no load in that area. Belts always stayed on without major reliability problems.

Riechert and other Horizontal systems with Porsche fan's hardly have any issues with belt throwing, unless the deflector pulleys aren't lined up correctly or tension is insufficient.

[Typ 4]

Corvair.jpg

Peugeot.jpg

[Typ 4]

Here is a not so high res photo from the 90's, that was my first home made Horizontal setup using the Peugeot deflector pulleys that I found at a scrap yard.

[Piledriver]

The Corvairs "belt tossing issue" was solved 50 years ago, kevlar belts and add a tensioner in the right place.
(will go on other side ase T4s rotate clockwise) The much lighter magnesium fan helped a lot as well...
Andigs T1 or the custom one he made for me weigh ~half or less less of the late GM magnesium fan, and far less than the ~$2K CNC aluminum fan that used to be the only good aftermarket option for the Corvair guys.

Here's some fan porn

Cut down 65+ magnesium Corvair fan, they usually get cut here due to cracking at the base of the fins stops at a reinforcement/sprue riser about halfway. only usable for racing, maybe AX. The original diameter is ~11 inches. This ones closer to 7. Note fan weights, courtesy of my Inficon scale....

corvair-cut-fan.jpg

Next, Andrigs original T1 fan, same type as race tested by FJCamper. Using it was my original plan, picked one up as you never know when you might find a bug or ghia that needs a T4...

Andrig-T1-fan.jpg

Andrigs custom, 19mm smaller Corvair fan, but with extra blades (14 vs 11) , custom by request, but would work great in Corvair...smaller to fit on top of T4 between trans flange and chimney with some room for fan housing.. 14 blades vs magnesium originals 11 blades, <half the weight of original.

Andrig-19mm-smaller-corvair fan-14-blade.jpg

[flxzcat]

www.typ4shop.de (use Google translator when you get to the site)

T4 Flat Fat.jpg

There are more low-quality pictures there and there is tech at the bottom of the left-hand menu somewhere that discusses fan flow numbers as I recall.

I'm not sure about the design of the fiberglass shrouds I've seen on any of the flat fan designs, even Raby's version. I don't see anyone defusing the airflow out of the fan like RSR, 934 908, 917 etc. Porsche defuses the flow at the exit which helps the air fan-out (ha, ha) centrifugally. These other shrouds just dump the air out into an upside-down shallow pan which I would think would kind of stall the flow?

Anyway, I want one and a few thousand doesn't really seem like all the money when an actual bevel shaft driven replica is like 20k

[flxzcat]

I thought it was interesting on all the engines they build, that they have the breather coming up from the pan area. I haven't noticed that before.

[Piledriver]

That's just where most T4s have the oil fill hole.
The breather should be from the case chimney, which is naturally heated, designed for that porpoise and works awesome stuffed with woven pot scrubbers for oil separation.

If you look carefully, there is a decent sized tube coming out the side of the chimney on that pic.
(on a big motor i would want bigger breather tube there)
No breather on fill tube.

Thinking about it, I bet Andrig could make 911 compatible composite fans and rings for a whole lot less than used Porsche prices...
The Corvair or T1 fan will make better pressure than the 911 axial fan so IMHO a better starting position choice but looks count for something... I will try and tart mine up.

Even better-I found my belt pulley setup and mount plate.

[Wally]

I came across a complete Riechert kit, still mostly NOS!
Building it up for the buggy atm on an still unopened 1800 412 ‘N’ engine, AT-code.
Used printed spacers to lift up the carbs, so could use the original linkage.
One pulley used as a model for a spun alu ones (lighter), so not complete yet. 3000km holiday with it in september, so fingers crossed!

[Eddie010]

That is spot on wally.
Good find.
I am not that lucky in finding those.

Regards Eddie