73GreenMachine
Well-known member
Over the last few months I have been in the process of doing a 2V head conversion. Things are finally starting to come together, last week I got the head back from the machinist with the following flow results.
I don't think it will let me host the larger image so here is a link:
http://memimage.cardomain.com/ride_imag ... _large.jpg
Here are some pics of the installation so far..
This last shot is a mock up of the LPG mixer installation.
The head has been CNC port polished by Bullet Cylinder Heads in Adelaide, Australia and fully rebuilt with new Viton seals, guides, hardened valve seats, Crow valve springs and Crane collets and retainers. Classic Inlines parts include SI Portflow 1.75"/1.5" Stainless valves, Yella Terra Roller Rockers, Clay Smith Chrome Moly Pushrods and ARP Head Studs (Thanks Mike!). Chamber volume is around 52cc to yield a compression ratio of ~10.5:1.
It is interesting to see these flow numbers alongside the CI Aluminium head, where the 2V has great intake flow at low to moderate valve lifts, it is overtaken by the stock CI head at around 0.400" and the ported CI head at about 0.350", highlighting its great high lift performance and hence horsepower potential with the correct camshaft design. The greatest improvement of the CI head is the exhaust flow, achieving a much better balance between intake and exhaust flow of 82% against 69% of the 2V (taken at 0.550" lift).
The engine is mostly together now, only needing the intake manifold, fluids and valvetrain adjustment before I can drive it, fingers crossed it will be springing to life in the next 24 hours!
I don't think it will let me host the larger image so here is a link:
http://memimage.cardomain.com/ride_imag ... _large.jpg
Here are some pics of the installation so far..
This last shot is a mock up of the LPG mixer installation.
The head has been CNC port polished by Bullet Cylinder Heads in Adelaide, Australia and fully rebuilt with new Viton seals, guides, hardened valve seats, Crow valve springs and Crane collets and retainers. Classic Inlines parts include SI Portflow 1.75"/1.5" Stainless valves, Yella Terra Roller Rockers, Clay Smith Chrome Moly Pushrods and ARP Head Studs (Thanks Mike!). Chamber volume is around 52cc to yield a compression ratio of ~10.5:1.
It is interesting to see these flow numbers alongside the CI Aluminium head, where the 2V has great intake flow at low to moderate valve lifts, it is overtaken by the stock CI head at around 0.400" and the ported CI head at about 0.350", highlighting its great high lift performance and hence horsepower potential with the correct camshaft design. The greatest improvement of the CI head is the exhaust flow, achieving a much better balance between intake and exhaust flow of 82% against 69% of the 2V (taken at 0.550" lift).
The engine is mostly together now, only needing the intake manifold, fluids and valvetrain adjustment before I can drive it, fingers crossed it will be springing to life in the next 24 hours!