Dorifto Machine

Short History: Bought a S13 SR20 Blacktop from a Zilvia member May of 2012.
Properly installed it over the last couple months. As of last month the car was running , had a high idle . Idle was corrected (Timing, TPS, IACV ) and car has been running for last couple weeks some what fine. All vitals and fluids were being checked periodically/topped off .

Problem: I noticed the water pump has been leaking out of the weap hole, so I ordered a new water pump. . During that time, this weird noise was presented intermittently after driving the car a little harder than normal (noise sounds like a door stopper being played with a rattle ) . Figured it was related to the water pump, maybe the bearings were shot or broken blade . So stopped driving it, replaced the water pump. Previous one was rusted to hell, no broken blades, no play in it, just leaky. Today , I went to crank the car and same noise is present if not louder / more consistent with also a squeaky/tick sound..
The car has oil in it and all other fluids are good.

Car is running at stock boost.
These are the specs of what the previous owner said is in the engine as far as under the valve cover;

HKS 256 cams
Rocker arm stoppers
BC valves and retainers

Here is the video of the sound. Watch from beginning to end. The noise is super evident around the 1:00 minute mark.

Video: http://youtu.be/qjcOfeW4cYc

Tomorrow, I will be opening the valve cover to check and see whats going on underneath. Maybe this will be good for anyone with a similar issue in the future.

What do you guys think it could possibly be before I tear things apart? Any suggestions?

Ive got a couple opinions from friends familiar with this motor, some saying it sounds like a lifter is bad to another saying it sounds like a rod knock or timing chain related...

Thanks for any and all help!


ISSUE FIXED 3/30/2013. Investigated and found a Loose Flywheel was the issue. Read Thread !