Sprint Distributors.

[cliftyhanger]

I have 2 sprint distributors on my workbench.
41402 which is fitted with a 7 degree baseplate and a pair of thinnish springs. I believe fitted 73-77
416055 which has a 12 degree baseplate, on thinnish spring and a thick spring that is quite loose. Fitted 76-81
The vacuum units are different too, but I forgot to write teh numbers down (will check tomorrow, too miserag=ble to go up the garage again)

My question is this. The baseplates are significantly different. As are the springs. So which is the best one to use??
And lastly what figure should teh max advance be set to? I have seen these posts
https://forum.triumphdolomite.co.uk/vie ... t&start=15
and significantly
https://forum.triumphdolomite.co.uk/vie ... hp?t=36999

in th elatter post there is mention by people with very good experience of setting max advance at no more than 32 degrees, but the book figure is 26.
With the 12 degree baseplate (24 degrees crankshaft advance) the stating timing would be set at 2-8 degrees. And the early dizzy (7 degree baseplate, 14 degrees crankshaft ) would have static timing at 12-18degrees.

I don't think there were other changes to the engines in 76/77? maybe waxstats? needles?

The earlier distrtibutor is ion better condition now I have fitted some new bushes (pilfered from an old spitfire distributor) so I am very tempted to just use that. I could modify the baseplate to give a little more advance? ANd play with the selection of vacuum advance mechanisms I have to see how much advance I can get under cruise without pinking.

This is all initiated by thinking about my knackered delco dizzy and when will I have time to build up the sprint engine.....

But words of wisdom re distributors would be most helpful

[cleverusername]

Personally I would just pick the dizzy in the best nick, as I suspect that wear will have more impact on performance than anything else.