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If you think about why that is, along with the difference in compression of these motors and other NA Subaru motors, it should be apparent why it may be an issue. The people who just slap on CAIs are probably not running wide-band O2 sensors, and keeping an eye on things. Everything I've seen people say here is about the car running rich with a CAI, which was never the issue. It is when the car randomly runs lean under load that kills a motor with detonation or high combustion temps. High compression NA motors can be just as finicky as a turbo when it comes to det. It doesn't really matter if the high compression is dynamic (turbo) or static (NA). /ot Still going with oil. |
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On the OT: while this car still has MAF in the intake, with similar potential for mis-measurement of the airflow, I think that on turbo-subies un-tuned for intakes were mostly magnifying issues with non-stock maps rather than making oem tunes go crazy-knocking. So I'd doubt that a properly installed quality intake would create issues on an otherwise stock FA20. Now, there could've been a post-MAF leak that is never a good thing. |
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If you pull over soon enough and stop the engine, no damage should be done. In my case I drove almost 3 miles before I realized what the "thunk" I heard actually was. The second I heard a metal on metal grind is when it became obvious to shut the car off immediately. After it was parked you could see almost 2 quarts drain out onto the street. That is what saved the engine. Got a free 30k service and 8 free oil changes out of it. |
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Though I agree that Perrin's R&D is sorely lacking and often fraught with error. That's why I won't put a Perrin product on my car. I doubt the non-damped pulley was the issue. The untuned CAI is a possibility, however a lean condition usually doesn't cause such a catastrophic failure. I'm thinking either oil pickup or oil pump failure leading to a rod punching through the side of the block. |
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Either way, we still don't know, and my post was more to throw a little more sense into the people automatically exonerating the pulley. For reference, the ATI damper on my 7M (83x91 BxS) is different than the ATI damper on a 2JZ (86x86). It would be really nice to get a definitive answer on the cause from Toyota. |
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did the dealership say anything yet?
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Being at the race track for several years I've failed several engines myself and been around many many others.
I've melted pistons, crack ring lands, blown head gaskets, dropped valves, detonated half-dollar size holes in pistons etc and in none of those incidents did I see anything come out the block. On the melted piston and cracked ring land the pressure in the crank case pumped a lot of oil into my catch tank but that's not what happened here. In the instances where the moving bits actually caused an oil leak it was usually "friction" related where a part that should be protected from friction wasn't and usually has to do with the crankshaft. I'm going to err on the side of others here and agree that oiling (or lack thereof) played a part in this failure. |
Very true! In the Supra community, undampened lightweight pulleys are one of the biggest known (or suspected) causes of crank walk... I personally plan to avoid this as an upgrade as I don't want to risk adding to the known problems of this car. It MAY be a fine upgrade, but to me it is not worth the doubt to gain a few ponies...
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But the aftermarket pulleys that I have seen for the 86 are not "underdrive". They are just "light-weight". Light weight pulleys just reduce rotating mass, without changing the speed of anything on the accy belt. Either way, they are not dampened, although it is a stretch to call the stock pulley's thin band of rubber out towards the outer diameter of the pulley an effective dampener. That is most likely there to take some engine pulsing shock off the belt more than anything else. If it is a dampener, then they were seriously trying to save some money. |
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