4-valve DOHC engine aircooled

[Cohibra45]

Martin,

I sure would like to see you guys and the other teams:

http://www.apfelbeck.nl/

http://www.pro-machining.com/

http://www.aircooledtechnology.com/vw.htm

get together and form a true international consortium group. All could share information, ideas and most importantly costs/rewards. This should make all concerns time lines much quicker. The different styles of heads, Jakes push rod 'Porkies', apfelbeck single ohc 3 valve, and your dohc 4 valve. I'm sure that each will have different costs/uses and the resulting benefits for all the VW aircooled community will be tremendous.

Just a thought. As Jake said over on his forum, a group working together can accomplish much more faster than individuals. I plan on posting this over on Jakes forum and Shoptalkforums and see what ideas and talk can be generated.

Kelly (Cohibra45)

[Wally]

Its for a motorcycle (1500cc) and was showed in England at Birmingham show.

[Bad bug]

I would really like to see someone finish one of these projects soon and test the heads.

[Bugat5speed]

Hi,

had the first heads on the mill now. Attached some impressions.

Martin

Bug @ 5-Speed

[Bad bug]

Martin Good day,

Can your heads fit an engine of 103mm bore.

[Bugat5speed]

Hi,

at the moment we are heading to a maximum of 98 mm bore, but the heads can be adjusted later. As the effect of power is much higher than with a 2-valve engine we will go for a maximum of 2.500 cc for the moment. Similiar engines (OHC, or DOHC) with only 2 valves gave more than 100 PS per 1.000 cc capacity. If it´s only 100 then the "small" 2.5 litre engine will give easy 250 PS.
Let´s see!

Next week a test on the flowbench will be done.

Martin

Bug @ 5-Speed

[Bugat5speed]

By some mails I found out that there seem to be some missunderstandings on the heads and the engine. The engine will be a complete new engine. It´s no type IV. We will have a crankshaft with 5 bearings and a very stabile crankcase. So high revvs will make no problem at all. The heads will not fit a type IV, as I didn´t want to follow the type IV-route. It´s my personal opinion, that the type IV-engines are already over their limits and do not stand what is promised. My experience is that they are not stabile enough from the crank´s side and by this can not stand the "tortures" for a longer period.