Db611?

[Dball]

My question is this;

Was there ever any such engine design?
I've viewed the write up of Daimler Benz known engines and there are two that rarely if ever get listed and they are the following;
Db608
Db611

No after done internet snooping I've found that the Db608 was a larger displacement development of the Db601 with 36.6 L displacement over the Standsrd Db601s 33.9L.
I read it was terminated due to development of the Db601H high altitude optimized engine.

Now I have yet to find any reliable info on the Db611.

Also as a side note
The Db620 is listed as a "coupled Db628 engines". Which strikes me as a bit more that odd as I've noticed that Daimler Benz routinely designates it's Coupled motorsin its numerical sequence FOLLOWING the single engine that it is derived from..
I.e.
Db601/ Db606 (coupled Db601s)
Db603/ Db613 ( coupled Db603s)
Db605/ Db610 (Coupled Db605s)
Db614/ Db615 ( coupled Db614s)
Db617/ Db618 (coupled Db617s)

So the outlier is the
Db628/ Db620 (Coupled Db628s)

 

[Calum Douglas]

My question is this;

Was there ever any such engine design?
I've viewed the write up of Daimler Benz known engines and there are two that rarely if ever get listed and they are the following;
Db608
Db611

No after done internet snooping I've found that the Db608 was a larger displacement development of the Db601 with 36.6 L displacement over the Standsrd Db601s 33.9L.
I read it was terminated due to development of the Db601H high altitude optimized engine.

Now I have yet to find any reliable info on the Db611.

Also as a side note
The Db620 is listed as a "coupled Db628 engines". Which strikes me as a bit more that odd as I've noticed that Daimler Benz routinely designates it's Coupled motorsin its numerical sequence FOLLOWING the single engine that it is derived from..
I.e.
Db601/ Db606 (coupled Db601s)
Db603/ Db613 ( coupled Db603s)
Db605/ Db610 (Coupled Db605s)
Db614/ Db615 ( coupled Db614s)
Db617/ Db618 (coupled Db617s)

So the outlier is the
Db628/ Db620 (Coupled Db628s)

The DB612 was built in reasonable experimental quantities, figures suggest at least ten were at least projected to be delivered. My best guess is that the 611 was another rotary valve idea which probably failed at the first attempt and was scrapped. The 612 was actually run, it just didnt last very long, the discs wore out.

I think the only reason the DB628 double engine wasnt given a double number, was that they stopped at DB632, and the 628
never performed as hoped for, so the double version was almost certainly never even drawn up, let alone built.
Generally these AI2 reports on German prototype engine numbers should be regarded with deep suspicion, however,this is a
post-war document, not wartime guesses from talking to downed pilots or informants. So it is "probably" trustworthy.

 

[Dball]

My question is this;

Was there ever any such engine design?
I've viewed the write up of Daimler Benz known engines and there are two that rarely if ever get listed and they are the following;
Db608
Db611

No after done internet snooping I've found that the Db608 was a larger displacement development of the Db601 with 36.6 L displacement over the Standsrd Db601s 33.9L.
I read it was terminated due to development of the Db601H high altitude optimized engine.

Now I have yet to find any reliable info on the Db611.

Also as a side note
The Db620 is listed as a "coupled Db628 engines". Which strikes me as a bit more that odd as I've noticed that Daimler Benz routinely designates it's Coupled motorsin its numerical sequence FOLLOWING the single engine that it is derived from..
I.e.
Db601/ Db606 (coupled Db601s)
Db603/ Db613 ( coupled Db603s)
Db605/ Db610 (Coupled Db605s)
Db614/ Db615 ( coupled Db614s)
Db617/ Db618 (coupled Db617s)

So the outlier is the
Db628/ Db620 (Coupled Db628s)

View attachment 681572
View attachment 681571
The DB612 was built in reasonable experimental quantities, figures suggest at least ten were at least projected to be delivered. My best guess is that the 611 was another rotary valve idea which probably failed at the first attempt and was scrapped. The 612 was actually run, it just didnt last very long, the discs wore out.

I think the only reason the DB628 double engine wasnt given a double number, was that they stopped at DB632, and the 628
never performed as hoped for, so the double version was almost certainly never even drawn up, let alone built.
Generally these AI2 reports on German prototype engine numbers should be regarded with deep suspicion, however,this is a
post-war document, not wartime guesses from talking to downed pilots or informants. So it is "probably" trustworthy.

Thanks for the reply. And that list has the best information regarding the 608 and 611/ 612.
The 628 was doubled but the doubled motor variant was designated the 620..
My question was why it's doubled version was given a numerically earlier number wheras all other doubled engines were given numbers than came sequentially AFTER their single engined progenitors

 

[Calum Douglas]

My question is this;

Was there ever any such engine design?
I've viewed the write up of Daimler Benz known engines and there are two that rarely if ever get listed and they are the following;
Db608
Db611

No after done internet snooping I've found that the Db608 was a larger displacement development of the Db601 with 36.6 L displacement over the Standsrd Db601s 33.9L.
I read it was terminated due to development of the Db601H high altitude optimized engine.

Now I have yet to find any reliable info on the Db611.

Also as a side note
The Db620 is listed as a "coupled Db628 engines". Which strikes me as a bit more that odd as I've noticed that Daimler Benz routinely designates it's Coupled motorsin its numerical sequence FOLLOWING the single engine that it is derived from..
I.e.
Db601/ Db606 (coupled Db601s)
Db603/ Db613 ( coupled Db603s)
Db605/ Db610 (Coupled Db605s)
Db614/ Db615 ( coupled Db614s)
Db617/ Db618 (coupled Db617s)

So the outlier is the
Db628/ Db620 (Coupled Db628s)

View attachment 681572
View attachment 681571
The DB612 was built in reasonable experimental quantities, figures suggest at least ten were at least projected to be delivered. My best guess is that the 611 was another rotary valve idea which probably failed at the first attempt and was scrapped. The 612 was actually run, it just didnt last very long, the discs wore out.

I think the only reason the DB628 double engine wasnt given a double number, was that they stopped at DB632, and the 628
never performed as hoped for, so the double version was almost certainly never even drawn up, let alone built.
Generally these AI2 reports on German prototype engine numbers should be regarded with deep suspicion, however,this is a
post-war document, not wartime guesses from talking to downed pilots or informants. So it is "probably" trustworthy.

Thanks for the reply. And that list has the best information regarding the 608 and 611/ 612.
The 628 was doubled but the doubled motor variant was designated the 620..
My question was why it's doubled version was given a numerically earlier number wheras all other doubled engines were given numbers than came sequentially AFTER their single engined progenitors

Did you not read the last paragraph ?

 

[Wurger]

Dball,

the 1939 DB611 existed alright, a inverted V developing 1180 hp. Specs are equal to the DB612V, differing only in the reduction gearing. The source shown by Calum refers to the DB612A. There was also a DB612B.
The DB 608 was from 1938, 154mm bore, 164mm stroke, 37 litres capacity, developing 1650hp with a weight of 710kg.