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
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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.
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?
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.
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.
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi in a streetlegal 1303
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
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
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi in a streetlegal 1303
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
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]
Porshe heads modified and looks like a mid engine set up with that tranny and exhaust as well ? 914, buggy originally ? Sequential tranny cool !
