Here's some details on the motor. It hasn't been driven for 1 year. . . The S13 didn't have a hood, so the blacktop was exposed in a garage all year (lots of dust on it etc). Oil is old, and the fuel is old.
We did a cold crank compression test on it by removing the fuel pump fuse, and keeping the throttle body wide open, and cranking it with and without all the spark plugs in. Here's the weird part. At first it was reading 95 PSI across all 4 cylinders. . . They were all pretty dead on. . . At the time, when we did this, we forgot to press down on the gas pedal, so we redone it with the gas pedal pressed in.
The results were basically the same. So we put some oil in the cylinder and it brought it up like about 8 psi. . . At this point we noticed that there's probably not much air entering the intake, so we removed the OEM tubing (that's connected to the side mount), and managed to bring it to 120 PSI. . .
So my question is, I understand these numbers are VERY low, but the guy told me he's been in a LOT of SR's, and tells me this one is clean, idles smooth, transmission is smooth, power is still very strong (all this a couple days ago, he bought the car from a friend and drove it to his house which is 2 mintues away).
So is the reasoning's behind the low PSI numbers due to the the old oil, and the 1 year old gas, let alone it sitting for a year (valve seals sticking)?
And is it a possibility that the engine may have had some work done to get the lower PSI? Such as an aftermarket Head Gasket, and forged internals etc?
He said he was going to drain the old gas out tomorrow, and idle it for a long time and warm it up, and then re do the compression test. I wonder if that would make it more normal? I
Anyways, here's some pictures of the actual SR.
