Use of 150 octane fuel in the Merlin (Xylidine additive etc etc)

In article , Hildegrin
writes
Dave Eadsforth wrote in message
news:o+F5SWAHQUGAFwMy
...
Good day, good people,

I wondered if anyone out there (in all probability, Peter!) could help
me understand more fully the process by which the Merlin engine was
enabled to use 150 octane fuel; one feature of which was the addition of
the Xylidine anti-knock compound. (This was touched on in a thread
last year, I recall.)

SNIP of incredibly useful amount of historical data.

Thanks very much for taking the time to type in all that information -
very much appreciated.

Re. your pondering about whether the Griffon engine was boosted over 25
in. Years ago, I was invited to take a look inside a Shackleton, and
while in the cockpit I noted that the boost gauges went up to something
phenomenal - I cannot now remember what the numbers were, but they were
definitely well in excess of 25. I did take a photo of the interior and
I will now try to look it out and see if the numbers are readable.

Someone out there who knows more about Shacks might be able to give an
accurate figure.

Thanks again,

Dave

--
Dave Eadsforth

Dave Eadsforth wrote in message ...

Thanks very much for taking the time to type in all that information -
very much appreciated.

That's OK. I didn't do anything towards researching the information.
The thanks really belong to the chap who spent a long time trawling
through the PRO for the info in the first place.

Re. your pondering about whether the Griffon engine was boosted over 25
in. Years ago, I was invited to take a look inside a Shackleton, and
while in the cockpit I noted that the boost gauges went up to something
phenomenal - I cannot now remember what the numbers were, but they were
definitely well in excess of 25. I did take a photo of the interior and
I will now try to look it out and see if the numbers are readable.

I'm mainly interested in the Griffon 65, and wether any other models
of Griffon were fitted to the Spitfire XIV during the war, but any
info on Griffons with 150 octane fuel is very helpful.