[Healeys] DW overdrive piston

[Bob Spidell]

I put one in my BJ8's O/D. It's subjective*--O/Ds seem to work a little 
quicker with cold, thick oil than hot oil--but it cuts maybe a third off 
engagement time on average. I had the O/D on the bench and disassembled, 
and the current one had a scored barrel so, why not? Engagement isn't 
much, if any, harsher than before which, I believe is the reason DMH 
wanted the weaker, smaller spring. If I'd known about it, I might have 
bought AHSpares' with an O-ring instead.

* I've never really 'timed' O/D functioning, it would be a bit awkward; 
anyone done it? I usually tap the clutch pedal when engaging O/D, and 
give a little throttle when disengaging. I thought mine engaged a little 
quicker when I switched to synthetic fluid from engine oil, but in all 
cases confirmation bias may be involved.



On 8/2/2022 8:09 PM, Joseph Costa wrote:
> Has anyone installed their upgraded overdrive piston?  If so, is it 
> worth the trouble ?
>
> Joe
> BN1 #923
>