Merlin negative G cutout too quick?

[Crumpp]

Its not a MkV (no cannons)

See:

The aeroplane was fitted with 8 Browning guns

http://www.spitfireperformance.com/x4922.html

Mk Va's had rifle caliber machinegun armament just like the Mk I's.

One of the topics I discussed with Group Captain Peter Gilpin (who flew Spits for the entire war) was the introduction of the 'Ms Schillings orifice' and to what extent it solved the problem of neg G cutout. He told me that he could nose down and chase/attack without any problems.

Which has no bearing on the fact:

However it does clearly show that even "Miss Schillings" orifice and the SU pressure carburetor are still subject to effects from negative G. Only direct injection is immune.