Hispano-Suiza 8B 220HP version

[PreußensGlanz]

Is there a specific version of the Hispano-Suiza 8B that made 220HP?
What I found was that the 8Bc & 8Be made 220 but I also found that the 8Be made 200 and only got to 220HP with new pistons, if thats true did any other version make 220HP after such an upgrade?

[Dan_San_Abbott]

Hi Christian:
1. H-S Geared 8Bc 5.3:1 Compression ratio, 220hp @ 2100rpm.
2. " " 8Be " " " 220hp @ 2100 ".
3. " " 8Bec " Cannon " " 220hp @ 2100 ".
4. " " 8Cc " " " " 220hp @ 2100 ".
5. " " 8Ce " " " " 220hp @ 2100 ".
6. " direct 8Dc " " " " 220hp @ 2100 ".
7. " " 8De " " " 220hp @ 2100 ".
8. " geared 8Ec " " " 220hp @ 2100 ".
9. " " 8Ee " " " 220hp @ 2100 ".
The H-S Type 35bis rated at 220hp @ 2100 rpm was 237 hp @ 2200 with the 24/41 gear ratios.
Blue skies Christian,
Dan-San

[PreußensGlanz]

Thanks, is there any deeper sense behind the lower case e and c?
Looks like the main subversions ran down from A to E and in case of the canon version the c could stand for the canon but I guess not as the others with c didn't have a canon.

[MiG-77]

Originally Posted by PreußensGlanz

Thanks, is there any deeper sense behind the lower case e and c?
Looks like the main subversions ran down from A to E and in case of the canon version the c could stand for the canon but I guess not as the others with c didn't have a canon.

b = Geared engine, low compression, short crankpins
c = Geared engine, high compression, short crankpins
d = Geared engine, low compression, long crankpins
e = Geared engine, high compression, long crankpins

Aa = ungeared engine wiht low compression
Ab = ungeared engine with high comperssio

[Kacey]

Originally Posted by MiG-77

b = Geared engine, low compression, short crankpins
c = Geared engine, high compression, short crankpins
d = Geared engine, low compression, long crankpins
e = Geared engine, high compression, long crankpins

Aa = ungeared engine wiht low compression
Ab = ungeared engine with high comperssio

Hello, MIG77

The information you provided above is correct for the source you are quoting it from:

Ministry of Munitions
Hispano-Suiza Engines
Notes to Squadrons in the Field
September, 1918
(Revised from E.F. Notes of february, 1918)

However, the other source known to me:

"Hispano Suiza in Aeronautics: Men, Companies, Engines and Aircraft",
M. Lage, November, 2003

States the opposite on the crankpin designations:

b = Geared engine, low compression, long crankpins
c = Geared engine, high compression, long crankpins
d = Geared engine, low compression, short crankpins
e = Geared engine, high compression, short crankpins

His data is suppose to have been from extensive H-S Co. records, which I don't think would get it wrong.

The ONLY thing that leads ME to believe Lage has it RIGHT and MoM may have had it reversed is:

The Original crankpins were the LONG pins followed by the SHORT pins when the crankshaft journals were increased in length from 60mm x 42mm to 60mm x 50mm.

So therefore ONE would think the ORIGINAL pins would be "b & c" followed by the NEW pins "d & e".

However, we are talking about the French here so I cannot be 100% sure that LOGIC prevails.

Respectfully Submitted,

KC