(2nd new thread in a row, is that legal)?


Since it just didn't seem to have the power I thought it should, I recently took some compression readings on my '94 Suburban 350. As I didn't have a lot of time that day, I just did it for cylinders 1-3-5-7. 1 and 7 were 115 and 3 & 5 were 120. They are within 15% so that's supposed to be okay, but 115-120 seems kinda low. Then someone told me that the '94 engines had inefficient heads and low compression for smog purposes. So maybe the compression is where it should be?


I wonder if Lucas Oil Stabilizer or Restore Engine Additive might help compression? I have used the Lucas stuff to thicken the oil when towing in hot desert temps.


(I didn't take the readings correctly I don't think. The engine was cold, I didn't have all of the plugs out and didn't block open the throttle plates [if there are any?])


I also recently found that the plugs, wires, cap and rotor had never been replaced, 22 years and 126,000 miles. The new plugs, etc., made a big difference in power. Then I installed my MSD adjustable timing control and that helped even more as you can feel the power increase while advancing the timing by 15 degrees. Next I've ordered a new computer chip from "fastchip.com" which will hopefully help even more.

 

that's pretty low but If they are all the same keep trucking, yeah you likely have the 8.75:1 compression ratio.
Use the best oil you can find I always use syn Royal purple.


Good luck.