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Showing results for tags 'non-interference'.
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Hey all, hopefully I won't be ridiculed or called an idiot for asking this, but I really want to know. I recently got an 05 WRX STI, I read that the DOHC EJ25 motors are interference engines. I know if you change your timing belts regularly, the odds of catastrophic failure due to pistons hitting valves is low. However, pulleys can seize and belts can fail prematurely. Also if you run without covers so you can regularly check them, that adds the possibility of something getting caught and breaking the belt. So my question is, how hard is it to make the engine non-interference? Will installing thicker head gaskets get the clearance needed to make it non-interference? If you increase how much boost the turbo puts out, will it successfully compensate for the compression loss you would get by raising the heads? Just how much overlap is there between the valves and the piston? Thanks in advance. -
I recently picked up a nice rust free 1997 Legacy 2.2 with a broken timing belt. I’ve gotten it started a few times but I am convinced the timing is still off. I was wondering if anyone on this page could offer any additional help. Things I know: Car is vinned as a 97 Inspection plates states that it was manufactured in August of 96 Motor is an ej22, non-interference motor – confirmed by grooved and stamped valve covers. Timing belt was broken while running. No other work has been performed on the vehicle since the timing belt was broken. Vehicle is not currently throwing any codes. Things I was told: Vehicle was running well with no check engine light on prior to timing belt breaking. Since I’ve taken possession of the car I have replaced the timing belt. The belt shows the appropriate amount of teeth, 44 to the passenger side, 40.5 to the driver side from crank notch. All the ears are present on the crank sprocket, I’ve lined the hash on the rear of the crank sprocket to the hash by the crank position sensor (approx. 12 o’clock) with the keyway facing down. I’ve lined the cam gears up with the belt, with the hash mark on the face of the gear facing upwards in the 12 o’clock position, in line with the notch in the timing belt cover. In this configuration the tdc triangle on the crank is in the 3 o’clock position, and the tdc arrows on the cams are up and to the right, 45 degrees clockwise from tdc. All pulleys, pumps, and idlers spin freely, tensioner is not leaking oil and takes a couple minutes in a vise to reset with a pin. I’ve had this timing belt on and off close to ten times, with at least 5 sets of eyes (all car guys and two professional mechanics) to verify timing. I’ve spun the crank multiple times and rechecked timing. Car has occasionally started, but starts hard and runs rough. While attempting to start, and performing the wot/clear cylinder procedure, and then applying half throttle, car pops and back fires violently. All of my experience leads me to believe the car is still out of time. There are a lot of knowledgeable guys on this forum, I’m hoping one of you can point me in the right direction. I’ve working on cars my entire life, and have an entire professional mechanics shop at my disposal. Any advice would be appreciated.- 11 replies
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- 1997
- subaru legacy
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