DOHC 4 valve heads - current status

[Bugat5speed]

Hi Walter,

it´s nice that you are not annoyed about another "OHC-producer". But you are right and I share the same opinion, that it´s good that some people do development and engineering on things that are totally different from the things that all do.

You may be right what concerns the price of such an engine, but on the other hand you will get something very special and - that´s the main reason - the engine will stand power and high revving. The reason for the new case is that we go with 5 crank bearings and that will give the engine a complete new character what concerns durability.
I don´t want to engineer anything based on a platform that (in my opinion) is not the correct one for a modern flat four engine. Type 1 and type 4 are wonderful engines, but 3 bearings are that what limits them for high revvs and high power. I know of too many engines that have to be reconditioned after only one season. I think that´s mainly caused by the case and the crankshaft. If you obey total costs on a longer period than such a type 4 can become very, very expensive and in the end the option with the new case might be the cheaper one.

It´s only the phase of development that slows down the project, but it will not have any effect on availability later. Each of my products once started as a single part and was later switched to a serial product.

How´s your project coming forward?

Martin

[Wally]

Cool!
I don't believe the stock case being 3-bearing only is such a weak point for the power output and duration of that output we talk about.
Failures of engines usually is a misconception of the parts used and more even so: incorrect maching and/or assembly of parts, but thats just my take on it, so don't let that put you off of your project

I just took my totally stock 914 2.0 engine in my street 1303 today to 305 Nm and 222 hp with the addition of a single turbo... The type 4's are great little engines

The apfelbeck project is not 'mine' though and AFAIK, its not moving at all at the moment