right mate has had some issues with his cossies engine smoking abit and missfiring. Also the 2 middle plugs no 2 and 3 and are filling up with black soot and 1 and 2 seem fine.


He had a compression test done on the engine and it read

140/130/120/140

The engine was recently rebuilt about 10k approx its a 200 block had .5 oversized pistons etc fitted and new oil pump new bearing, crank ground etc.

Would it be possible to just change the rings on the pistons all the way across? would this remedy it? Why else could the compression be low ?


Whats should the compression ratio be for a healthy 200 blocked cossie engine?

cheers in advance guys

 

What colour is the smoke as it sound more like its over fueling tell him to swap the outside injectors with the inside and see if 1 and 4 do the same cheers james

 

ok will do that. Its smoking blue and gets thinner and clears up as it get to running temperature. But as said 2 middle plugs are black soot and even when cleaned get black soot over them and the 2 outer ones are fine and good an healthy

 

If it smoking blue its burning oil so might well be rings then .Does th car use alot of oil as if its that bad sounds like it will cheers james

 

could be valve stem oil seals