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I stumbled across a website that appears to have a DIFFERENT flat VW engine with overhead cams! This is definitely not the WRX-headed engine....


http://www.vw1303s.at/

HÖBART 2 OHC Motor

TRIJEKT Motormanagement

BOSCH Einspritzdüsen
2 Stück pro Zylinder

TWM Drosselklappen
48 mm
Basis TYP 1 1997 ccm

Auf diesen Seiten soll in den nächsten Wochen ein Bericht über die 2 OHC Motoren von R. D. HÖBART entstehen.

Diese Bild wurde im Juli 1979 entwickelt.(Datum auf der Rückseite des Bildes.)

MOTOR VON WALTER MAYER

ÜBER INFOS UND FOTOS DER 2 OHC MOTOREN VON HUBERT KATZIAN, HERBERT BREITENEDER, WALTER MAYER UND
RUDOLF KROKER WÜRDE ICH MICH FREUEN.

2 OHC Motor (Stage 2)
von Herbert Breiteneder


Technische Daten:

Bohrung: 86 mm
Hub: 82 mm
später 84 mm
Einlaßventil: 46 mm
Auslaßventil: 40 mm
Vergaser: Weber 46 IDA

Leistung:
194 PS bei 7800 U/min

Anyone have any ideas what is going on here?
- David

According to Babelfish:

HOEBART 2 OHC engine TRIJEKT engine management BOSCH injection nozzles 2 pieces per cylinder TWM butterfly valves 48 mm of basis TYPE 1 1997 ccm

On these sides a report is to develop over the 2 OHC engines of R. D HOEBART in the next weeks. This picture became in July 1979 entwickelt.(Datum on the back of the picture.) ENGINE OF WALTER MAYER OVER INFORMATION AND PHOTOS OF THE 2 OHC ENGINES OF HUBERT KATZIAN, HERBERT BREITENEDER, WALTER MAYER AND RUDOLF KROKER I BECAME BEING PLEASED.


Technical data: Drilling: 86 mm stroke: 82 mm later 84 mm intake valve: 46 mm exhaust valve: 40 mm of carburetors: Weber 46 IDA Achievement: 194 HP with 7800 U/min

....

So ... I guess someone is trying to replicate (or has done it) a prototype OHC VW engine?

One page says that Herbert Breiteneder won the Austrian Rally-Cross championship in 1979 and 1980 with this engine. So I think this was a "homemade" engine back in the early 80s. And they use these or similar heads on their current rally-engines.
Another interesting thing is the sequential Hewland transmission.

regards

rwx

so any guesses on how the fan is turned for cooling? alt is off to the side, two wires going to possible electric motor that turns the fan at back of shroud?

Looks like a T1 engine with OHC heads to me. Maybe they are modified porsche heads?

Daniel

My guess would be Porsche, too...as it is the only air-cooled flat-six around, and those heads/cam-boxes/valve-covers definitely came off of a 6-cylinder arrangement.

Porshe heads modified and looks like a mid engine set up with that tranny and exhaust as well ? 914, buggy originally ? Sequential tranny cool !

this is the sequential tranny, looks pretty nice

I do not recognize the heads, but I´m no Porsche expert either. Could definitely be from a Porsche.
But the general setup was widely used from the late 70ies and up to early 90ies in rallycross and similar racetypes. But with VW type heads though. In those days, they averaged about 170 - 175 hp on max 2000 cc. In the early 90ies they were able to pull about 190 - 200 hp. on those, turning up to about 8 K rpm. Now both the T1 & T4 are almost obsolete in these classes because of build cost. they now choose to run in a class 1 step higher and are then allowed to use "foreign" engines, such as 16 & 20 valve Toyota, 20 valve VW engines. - Even then they are still fairly competive, because of the ability to launch fast and get out of the curves. But these cars are getting rare now.
T.

I have seen that web-site some time ago. Definately 911 heads, probably from an early 911 model (2,2-2,4?) which may have a cylinder spacing closer to the type 1. Looks like they casted their own valve covers.

Very beautifully done. I gues only competition generates money for this kind of developments...

Fan is electrical. That also is a clear indication that this is a competition engine-only, but a normal belt-driven cooling system would not be a problem to adapt.

The name Overfly spring to mind? I cant remember where he hails from anyone confirm where and if this is his ?

Bobtail wrote:The name Overfly spring to mind? I cant remember where he hails from anyone confirm where and if this is his ?

Hehe, no the Overfly engines were made by Holzapfel and were all type 4.
Also, Rolf used the 993 alu 100mm Nikasil cylinders with those..
I'am sure you remember Paul
There are some pictures of those on the net somewhere too

I built my first VW engine in 1978 like that.
We used T1 case, and Porsche 911 2,7 liter heads.
It ran NA and then with turbo.
I used it for many years both in a dragster and then in my street 67 beetle.
I have plenty of pictures and they have been posted here before. Unfortunately I have no webhotel. Someone wants to host them, mail me.
[email protected]

This one?

More pictures from Frallan's engine in this post about half way down...

http://www.vw1303.at/bilder/2_ohc/1.htm
236hp@8300 out of a 2 liter type1 and all that 25 years ago, pretty impressive