Carb/timing procedure

To continue on from post #7....
Many racers, especially before we got elec 'boxes' that were able to set ign parameters, used to lock their dists. Some still do it. So, if it was locked at, say, 36* that means:
- it cranks at 36*
- it idles at 36*
- it runs from 0 to max rpm @ 36*.
With hi power mini starters now available, there is no problem cranking with that timing.
Another trick you see on performance engines is to have a centri curve in the dist, but have it come in quickly. 'All in' by 1200 or 1500 rpm. So what is different in ign timing requirements between 1200 & the 900 rpm idle speed. Um.......nothing. Which is why MVA does the same thing as far as timing goes as a locked or quick-curve dist, but with an important benefit. VA is load sensitive. It drops away under load. Important for minimising detonation.

Any body contemplating using MVA [ a good idea if the combo can use it ] should never, ever try it with a stock or non-adj VA unit. All you will get is erratic & unreliable performance....& probably get on a forum like this & say MVA is no good!