Comrades,
I have a '91 with 80K miles. I had the dealership change the oil (full Synthetic, as always) just 1K miles ago. The only mods I'm aware of are an Prospeed Stage 3 ROM Chip (I don't believe it changes the rev limiter setting), headers, and exhaust. However, I'm not the original owner, so no telling what may have been done in the past. I've never heard any irregular sounds before, even on cold starts.
I recently started it up, let it warm up for 5 mins or so before getting too aggressive, then floored it up to the rev limiter. Immediately after that, I heard a deep knocking in sync with the RPM. I had a mechanic come over to look at it, and we isolated it to the #1 cylinder by unplugging the injector wires, one by one. The assumption in that this cylinder got oil-starved somehow. The plan is to get the car to his shop, drop the oil pan, and take a look. If the motor needs to come out, my mechanic doesn't want to take on a rebuild, so I need to have a plan if the motor needs to come out. Hopefully it can be resolved without dropping the motor, but I'm not holding my breath. So, trying to weigh my options;
I've done some research here, and some say it's a safer bet to get a used motor from a wrecked NSX than to tear into this one, as there's no telling what all it will need until it's opened up. However, those were pretty old posts, and they referenced used motors going for around $2500. From searching the marketplace, Ebay and Driving Ambition website, I found 2 used engines at $8K each, so assume that's the going rate.
If I get someone to tear into the engine, I'm afraid we wont be able to source the parts we may need (bearings in the right size, etc), and those we do find may be very expensive. I've also read that grinding the stock crank is not recommended. However, I see on Ebay there's a used crankshaft for $1500 in Hungary, but that seems risky.
So, that's my dilemma. Does anyone have any advice for how to get through this with minimal expense and headache?
Thanks in advance.
I have a '91 with 80K miles. I had the dealership change the oil (full Synthetic, as always) just 1K miles ago. The only mods I'm aware of are an Prospeed Stage 3 ROM Chip (I don't believe it changes the rev limiter setting), headers, and exhaust. However, I'm not the original owner, so no telling what may have been done in the past. I've never heard any irregular sounds before, even on cold starts.
I recently started it up, let it warm up for 5 mins or so before getting too aggressive, then floored it up to the rev limiter. Immediately after that, I heard a deep knocking in sync with the RPM. I had a mechanic come over to look at it, and we isolated it to the #1 cylinder by unplugging the injector wires, one by one. The assumption in that this cylinder got oil-starved somehow. The plan is to get the car to his shop, drop the oil pan, and take a look. If the motor needs to come out, my mechanic doesn't want to take on a rebuild, so I need to have a plan if the motor needs to come out. Hopefully it can be resolved without dropping the motor, but I'm not holding my breath. So, trying to weigh my options;
I've done some research here, and some say it's a safer bet to get a used motor from a wrecked NSX than to tear into this one, as there's no telling what all it will need until it's opened up. However, those were pretty old posts, and they referenced used motors going for around $2500. From searching the marketplace, Ebay and Driving Ambition website, I found 2 used engines at $8K each, so assume that's the going rate.
If I get someone to tear into the engine, I'm afraid we wont be able to source the parts we may need (bearings in the right size, etc), and those we do find may be very expensive. I've also read that grinding the stock crank is not recommended. However, I see on Ebay there's a used crankshaft for $1500 in Hungary, but that seems risky.
So, that's my dilemma. Does anyone have any advice for how to get through this with minimal expense and headache?
Thanks in advance.
