More fantastic views into this engine. Thanks again, Matthias!
I would guess, based on the rather square shape of the cam lobes, that each lobe does double-duty with exhaust, then intake valves. Pretty slick design, and very clean looking. Again, as a newbie guess, I assume that square lobe shape allows a little valve lead, lag and overlap.
And it’s hard to tell, but it appears that there is no bearing material (like bronze) in the cam towers, where they hold the camshaft. The bearing material could be hidden inside, but if not, this is another fresh new surprise. This is why those high-resolution pictures are helpful, Matthias. Please, snap away !
Tom.
There are two cam lobes per cylinder, each lobe actuates an inlet valve (einlassventil) and an exhaust valve (auslassventil), therefore four valves per cylinder. I have attached a scan from my DB601 manual which should provide a clearer view of the mechanism. Please note the cam profile on the DB601 is not as ‘square’ as the DB605 – the DB605 has quite an abrupt opening and closing action, with a longer duration open than the DB601 and consequently, I believe, makes the DB605 sound like a race engine, especially at idle. 🙂
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Fantastic photos Matthias! Thanks again for posting. 🙂 🙂
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