Early HW55 spring info. please

[deejayuu]

Thanks for looking. Would like to know what current spring specs. people use for the 25 mm 50/55 please.

[Phil Russell]

Hopefully this will help but cannot guarantee:
From my notes: (note that I was not aiming for high power)

' Original spring spec is, I believe c. 2.75mm wire x 32 coils. The replacement I put in is HW77 spec but seems OK. A meteor spring does not fit as the spring guide does not fit.
Subsequently fitted a 7.5J spring from Versandhaus Schneider'

Cheers, Phil

[MDriskill]

Some examples I have on hand:

+ Used one removed from an early-1960's "Burgo"-labeled HW 55: 31 coils, .770" OD, .110" wire

+ Used one removed from a mid-1980's HW 55: 31.5 coils, .775" OD, .110" wire

+ Un-used modern HW 55 replacement from Jim Maccari here in the US: 31.5 coils, .770" OD, .112" wire

+ Used one removed from an old-style HW 50: 29.5 coils, .775" OD, .120" wire.

I've had great luck with Maccari's springs in several HW 55's - good boost in power over factory, and very smooth and crisp action. The old factory HW 50 spring also works nicely in the 55.

[deejayuu]

thanks for all support so far. Struggling to find UK compatible as yet. So all helpful.

[HW777]

A titan No 11 or 13 cut to length for the limited spring room in a 55 piston would be my first choice but neither will fit the original spring guide, which is close to 14mm od if memory serves me well

[deejayuu]

A titan No 11 or 13 cut to length for the limited spring room in a 55 piston would be my first choice but neither will fit the original spring guide, which is close to 14mm od if memory serves me well

Agreed and thanks HW777. I have a donor guide on an earlier block which can be modified. Reluctant tho' in case someone needed it for authentic resto.