Originally Posted by
sickpuppy1
during break in, wouldnt I want it cooler, I mean, I know below 200 is not cool, so to speak, what am I looking for? 220-240 ish. I know, dont tune by temps, just thinking of a "ideal" range to try to keep it in around now. Outside temps this week should be mid-upper 70's. Humidity 50-70%.
You want to keep the motor in the normal operating temperature range - but running very rich during the first 12 or so tanks of the break in. In order to keep the temps up while running this rich you need to foil the cooling head.
By runnig the motor at these temps during break in, you are bedding the piston and sleeve in at the temps they will be operatng at during itīs racing life. This makes for a much longer lasting and better performing motor.
Running the motor too cool when it is so tight makes for mega wear on the components. Remember how much easier it was to turn the motor over after you had heated it with the heat gun, as opposed to when it was stone cold.
Keep the temps in the 210 -250 range by adjusting the LSN and adding / removing foil from the head as neccessary. After the 12 tanks remove the foil and run another three tanks just slightly rich, but nice and easy through the full rev range. After these 15 tanks in total, set it to a moderate race tune and give it some. Then just wait until the rest of the metal pinch goes at around 1 - 1.5 gal, remove the break in shim somewhere during this period when you feel the motor is loose enough. Go and kick arse on the track
Change the rod, wrist pin and C clips at 2 gal.