30-12-2020, 04:03 PM
Hi Roger,
I think its time to do a volume check on both my 9E heads.
I know one was skimmed in the 1990s with the minimum taken off it.
The other head is a more recent find but the 9E block that came with has still got its diamond marks on its top face although this head will need a light skim.
The engine also runs well with a Ruby HC head.
I have a perspex sheet and a burette in the shed from a modern engine build.
I always understood you could never get too much compression with the Austin side valve design without making the valves smaller with less lift to make the chambers smaller.
I think its time to do a volume check on both my 9E heads.
I know one was skimmed in the 1990s with the minimum taken off it.
The other head is a more recent find but the 9E block that came with has still got its diamond marks on its top face although this head will need a light skim.
The engine also runs well with a Ruby HC head.
I have a perspex sheet and a burette in the shed from a modern engine build.
I always understood you could never get too much compression with the Austin side valve design without making the valves smaller with less lift to make the chambers smaller.