10-12-2018, 06:44 PM
Reliant side valve shells were designed for a housing diameter 1.8940~1.8945".
I have attempted to measure three different A7 housings and come up with figures ranging from 1.875 to 1.893".
A marginally smaller housing dia would have the effect of increasing 'nip', which may acceptably be 0.003-0.007".
Anything above 0.008" will cause local deformation at the parting line, less than 0.002" and the shells will spin in the housing, with or without tabs.
Nip (or 'crush') is measured by doing up both bolts then removing one, and trying feeler gauges in the gap which should open up between the two housing parts.
I have attempted to measure three different A7 housings and come up with figures ranging from 1.875 to 1.893".
A marginally smaller housing dia would have the effect of increasing 'nip', which may acceptably be 0.003-0.007".
Anything above 0.008" will cause local deformation at the parting line, less than 0.002" and the shells will spin in the housing, with or without tabs.
Nip (or 'crush') is measured by doing up both bolts then removing one, and trying feeler gauges in the gap which should open up between the two housing parts.