I was racing my friend in the back roads and I over reved my car from shifting to second instead of forth.. I found out that i had bent valves and got that fixed.. we did a compression test and it was 200, 170, 200, 170.. the problem is that when we did the leak down test, one cylinder is leaking 50 percent and the three remaining does not have any compression at all (meaning it is leaking fully). The car seems pretty strong considering the fact that i can still smoke my friend's SI but what could be the problem? is it ok to drive it around for now until i get the money to fix it?

 

Are you sure you did the test correctly? Being that 3 cylinders didn't hold any compression makes it seem like you tested those cylinders with the valves open and cylinder down.

"The engine should be rotated so that the valves in the cylinder to be tested are closed and the piston is at top dead center. Tests should be conducted when the engine is warm."
http://www.vclassics.com/archive/leakdown.htm

 

well, a local shop did the leak down test and i was there when they did it.. they seem to know what they are doing and they said it could be burned piston rings because the previous owner of the car is shooting nitrous.. but then again, they might have done the test wrong or something

 

If the local shop was doing it, then they should know the exact problem, which depends upon the results of the tests. More then likely its the piston rings though.

 

if I have a blown or burned piston rings, wouldnt the car would run all messed up? and the car would be really really weak.. because the car seems to run fine except that during the idle, the rpm would sometimes drop to about 600 and sometimes 550..