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+--- Thread: Origins of a 9E1-AF cylinder head (/showthread.php?tid=8848)
Origins of a 9E1-AF cylinder head - Nick Lettington - 31-08-2023
Can someone knowledgeable please help me by confirming the origins of a 9E1-AF head. Two differing opinions from two people I respect. One suggested EA Sports are 9C and Nippy 9E... the other that a 9E1 head that sloped down towards the edge furthest from the valves was EA Sports and one flat like the late Ruby was Nippy.
Is there any printed information that would give a definitive answer?
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RE: Origins of a 9E1-AF cylinder head - Chris Garner - 31-08-2023
Nick,
Basic rule of thumb is 9E is non-supercharged Ulster, 9C for supercharged.
Good to see another of these patent numbered 9E1 heads, similar to to one I was discussing in an earlier post
RE: Origins of a 9E1-AF cylinder head - Nick Lettington - 31-08-2023
OK... following a phone call, slightly more confusion and a third opinion... does anyone know if any replica 9E heads were made with a sloping top (reducing the water capacity and passage width) or if they (as logic would suggest) were generall made with a flat top? It seems an odd detail to replicate in a copy.
RE: Origins of a 9E1-AF cylinder head - Charles P - 31-08-2023
I only have the very high compression replica casting!
RE: Origins of a 9E1-AF cylinder head - Nick Lettington - 31-08-2023
(31-08-2023, 11:52 AM)Charles P Wrote: I only have the very high compression replica casting!
With a sloping top...
RE: Origins of a 9E1-AF cylinder head - Charles P - 31-08-2023
(31-08-2023, 11:58 AM)Nick Lettington Wrote:(31-08-2023, 11:52 AM)Charles P Wrote: I only have the very high compression replica casting!
With a sloping top...
Indeed. Only the best for my bogus Ulster
RE: Origins of a 9E1-AF cylinder head - Chris Garner - 31-08-2023
I'm indebted to David Howe for freely supplying more information on Ulster reference numbers and corrections where necessary. Thank you.
1. Parts common to production supercharged and non-supercharged Ulsters are 9C. eg: steering box and rear shock absorber links.
2. Parts only on the non-supercharged production cars are 9E.
3. Parts only on the supercharged production cars are 9C - primarily the engine and ancillaries.
4. 9B numbers are found on Works only parts.
5. SP numbers are found on Super Sports, supercharged engines
6. 1A numbers are found on both 8-stud supercharged and non-supercharged blocks as these are Longbridge modified standard castings.
7. 9C numbers are found on 10 stud blocks, both types.
8. 1 5/16" Ulster cranks will be stamped " Ambrosia " as this company were their manufacturers for the AMCo.
I'm sure the above data will be useful to those wishing to identify or to build up early sporting Sevens.
RE: Origins of a 9E1-AF cylinder head - Ruairidh Dunford - 31-08-2023
Can you elaborate on what a “Works Only” car is please, Chris?
RE: Origins of a 9E1-AF cylinder head - Scarlet O'Hara - 02-09-2023
Here's another one for you Chris, I did't think they were that uncommon and just assumed that they all had the patent number. This one's on the Type 65 and most of the other sports parts on the car have a 9E number apart from the torque tube socket that is 9C144. The much later Speedy crankcase (M248719) has a 9E199 number. Did the 9E numbers possibly come in with the change to the long chassis but left over 9C parts that could be fitted got went onto early 65's and 75's?
Forgot to say so hence a quick edit. The head isn't wedge shaped and is the same thickness all over, it also has 18mm plugs.
RE: Origins of a 9E1-AF cylinder head - dickie65 - 02-09-2023
Both my 9E heads are not wedged.
It is my understanding That the EB65 EB75 and Nippy all used the Ulster 9E head.
I have found the 9E head to make the engine harsh probably due to the combustion happening on one half of the piston tipping the piston which tips into balance as soon as it moves off TDC ( Piston Slap )
There are cast iron, Alloy and Bronze Replica 9E heads in existence.
I paid £5 for one of my 9E heads in 1980 the owner wanted to upgrade to a later head with 14mm plugs.
Neither of us knew what a 9E head was from.
I found out at Longbridge in 1982 when I found one on an Autojumble stall for £30.
My father bought the EB65 which I now have which did not have the correct cylinder head ! So I gave father the 9E head.