Re: Re: Compression Number

[Anonymous]

Published ratio is 6.2/1 and compression circa 7.7kg/cm2 or 111 psi with flat top pistons (domed pistons which you fitted should lift the ratio)

Before my engine was rebuilt with new pistons and liners, bearings etc. it showed just over 102 psi on a compression test, but as the crank had to come out to be reground and there was a lip on the cylinders it was decided to change the pistons and liners anyway (on a BL you really can’t do anything much without removing the engine) for the sake of another £300 considering the work involved to do it later.

Funnily enough, I haven’t done a compression test now everything is run in, maybe I should…..