I have been having alot of trouble with compression and I just finished an engine rebuild, still seems low, so my questions is what should my compression be at 5430 ft elevation at 12.5 atmo pressure. b18b1 engine

 

.86 x the nominal.

 

What are your numbers? Your not really looking for a certain number just a variance in the cylinders

 

he's just curious about the elevation from sea level

 

the difference between the highest and lowest is 3psi. im at 155 - 158 psi on all cyl, but thats after an engine rebuild and seems low, but could be good depending on the elevation.