Copied from
another site
dkjones96
Thread Killer
Senior Member
Join Date: Nov 2007
Location: Albuquerque, NM
Posts: 1,350
-Polish only the exhaust port, do not port the head.
-Stock cams or cams that are ground to make power lower than stock.
-Polish valve faces, combustion chamber and piston crown to a mirror like finish.
-Exhaust header with straight though exhaust system (the exhaust system takes actual thinking and must be sized appropriately with the displacement).
-Compression should be around 10:1 for aluminum heads and ~9.2:1 for iron as these are the upper limits for pump regular gasoline (dependent on other factors but this is a general rule).
-Moly rings as stated above.
-Very tight clearances so you can run nice, thin 0w-20.
Break-in can make or break an engine with economy. Don't do the easy on it for 400 miles BS. After a couple of light warm up to operating temps and cool downs to ambient take it out and have a healthy run-in with a healthy combination of almost to red-line ~80% throttle runs and engine braking from the top of a gear (preferably 2nd) down to 1.5-2k. Make sure it's done in the first 20 miles.
If you do it right this will make for very nice economy. I built an engine following these guidelines and the engine runs powerful with good economy. I did a couple things differently that let me go with 11.2:1 on pump regular gas but it got direct injection and a slew of other items...
__________________
- Kyle
Last edited by dkjones96 : 05-09-2008 at 11:40 AM.