I may have asked this question before, but don't remember a definitive
answer. Which grade unleaded do I use in the 69 Spitfire? Normal compression
(3 out of 4 cylinders) seems to be in the 150 to 160 range. Does this
mean it is the "high" or "low" compression version of the 1300 engine? And
should I run it on 87, 89, or 92/93 octane gas?
The reason I ask is, I can't seem to retard pinging out of the engine
totally on 87 octane. After my mechanic put the new timing chain on, the
distributor is at a different angle, and the marks on the crankshaft pulley
actually seem to make sense. So, I am trying to set 2 degrees ATDC as
it says on the under-hood sticker. I get pinging on acceleration... if
I retard further the engine gets really hot and anaemic. And I still have
some pinging under load!
With luck the "new" MG is delivered tomorrow. ...John
(So what gas do I run in a 73 MG?)
Thanks!!
|