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Holbay
- Thread starter skywords
- Start date
Wombat
Donation Time
Holbay was a British builder of racing engines. They built for Rootes a twin weber version of the 1725. This engine was used in the 1968 London to Sydney Marathon winning Hillman Hunter and fastback Sunbeam Rapier H120. I am not sure which the engine was originally developed for. It was also used in the Hunter GLS (UK only).
The engine had a different head with inlet ports that were smaller(!!) than stock and a different combustion chamber shape that looks as though it would breathe better. The engine also had different flat top pistons, heavier valve springs, higher compression, longer duration cam, the webers, headers and no doubt other items as well.
Better?? maybe, but I am sure that similar performance could be obtained by other mods. Ther was some debate on the old board about the relative merits of the Holbay head compared to stock.
The engine had a different head with inlet ports that were smaller(!!) than stock and a different combustion chamber shape that looks as though it would breathe better. The engine also had different flat top pistons, heavier valve springs, higher compression, longer duration cam, the webers, headers and no doubt other items as well.
Better?? maybe, but I am sure that similar performance could be obtained by other mods. Ther was some debate on the old board about the relative merits of the Holbay head compared to stock.
alpine_64
Donation Time
the holbay motor also ran:
finned alloy sump
oil filter base with temp sender
different dizzy
different cam though there seems to be 2 versions, the production on and the development one (e128?)
the holbay engine is also a slant mounted motor, so it wont bolt dirrectly to an alpine. you need to swap timing covers and also modify or get a new inlet manifold.
The smaller runners were to help with low end torque apparently.
finned alloy sump
oil filter base with temp sender
different dizzy
different cam though there seems to be 2 versions, the production on and the development one (e128?)
the holbay engine is also a slant mounted motor, so it wont bolt dirrectly to an alpine. you need to swap timing covers and also modify or get a new inlet manifold.
The smaller runners were to help with low end torque apparently.