[Mark Savage]

I Love This Disscusion

I would agree with Chevynut And Rick L. All engines have designed tolerances for optimum performance,piston to wall clearance,bearing clearance and so forth.You need to run at least 185 degrees for several reasons,every engine when cold started create condensation (sweating) and it takes engine temperature to dissipate this also carb jetting becomes a factor,a cooler engine needs more fuel for the cooler temps and less when the engine is warm and can cause premature spark plug fouling (to much fuel when a motor is up to temp will as we say make it lazy). Then getting back to machine tolerances, a cold motor is much tighter and has not fully expanded say at 150 degrees versus 185 or 210 degrees and causes much more premature wear on the cylinders and rod and main bearings (that's why you do not sit and free rev a cold motor). So in a nutshell you need to have a engine up to temperature before you can attempt to TUNE IT, 185-210 DEGREES is what your looking for,your problem is one that everyone wishes they had,you just need to block a little air flow. Will YOU KILL YOUR MOTOR RUNNING AT 150,NO (but you are putting premature wear on it) is it running at its full potential, NO. And a further note todays engines run what us older folks consider TO HOT,the reason for this is they must to meet emission standards but that's another book.