02-23-2006, 10:14 PM
Much below 60 isn't optimal... unless you take precautions.
The only time I broke in (or began breaking in) an engine when it was around 30F out, I used those chemical hand warmers ziptied to the engine head the whole time I was out. I ran about 8 tanks through the engine and it was fine when spring finally showed up.
With the hand warmers ziptied to the head, the head temp at the GP never got below 80F during the cool downs. It made it easy to get the engine up to 210 for a proper break-in temp as well.
The only time I broke in (or began breaking in) an engine when it was around 30F out, I used those chemical hand warmers ziptied to the engine head the whole time I was out. I ran about 8 tanks through the engine and it was fine when spring finally showed up.
With the hand warmers ziptied to the head, the head temp at the GP never got below 80F during the cool downs. It made it easy to get the engine up to 210 for a proper break-in temp as well.