Crank and rods
 

I was looking for a Turbo Z31 to use as donor car for a NA/Turbo conversion and what I found is a low priced 85 Turbo. I'm going to look at the car this week. The guy sent me a pic of the car and it looks to be in very good condition. Other than a knock in the engine this car might be worth fixing. Besides I don't really want to be responsible for killing a Z car if it's not ready to died. He's only asking $500 for it so I'd have some room to fix it up.

I have a spare NA engine I can pull the crank and rods from if it's got a spun rod bearing. The sounds he said it makes me believe that's what happened. He also said it lost oil pressure just before the knock started. My next questions will be if the crank and rods are the same on a NA and Turbo. I know the compression ratio is diff. , but isn't the because of the pistons and heads??


I'll know more after I see the car, he might think it's in great shape when it's trashed..LOL

After thinking about it once I get the engine apart I might be better off the take the bad crank to a machine shop and have it turned, since I should do that to a new crank before you install it anyway.

I am also worried about other bearings in the engine, if he really lost all oil pressure figure other bearings probably were worn and might fail later.

If you're going to dig that deep into your engine then you should just replace all the bearings. Especially if the failure was a result of no oil pressure. Bearings aren't all that expensive and it's better to be safe then sorry.