My engine has approximately 104,000 miles on it… I presumably bent a connecting rod this past weekend on the stock motor (hasn’t been verified yet…); so, assuming I didn’t have a catastrophic engine failure and the crankshaft, etc. is still in good condition, would it be ok in reusing the original block? I’d be running 96mm pistons in it.

I was reading the sleeve thread and started wondering if all the miles on my engine could potentially lead to a sleeve/block failure after I build the engine with Eagle/Wiseco internals? This motor won’t see more than 600 whp, but it’ll see plenty of time on the road. Just wanted to see what everyone’s thoughts were…

Thanks!

 

As long as your boring it out to 96mm it will be fine.

 

Everything can and should be checked when you go to reuse it. Assuming all checks out, I would have no fear in reusing your original block.

 

matching numbers

 

Yup, the plan’s to bore out the cylinders to make room for the 96mm pistons.

Thanks! Do you know of what I should be looking for precisely? Or what the machine shop should? Just want to make sure it gets done right.

lol, exactly!

I appreciate everyone’s input!

 

Bumping this thread! Quick question!

So, back in March I came across a “good” deal for a spare/core engine for my build; the engine was out of a supercharged 2003 350Z, the owner said it was running but had low compression in one cylinder. Anyways, I decided to purchase this engine and build it as it’d be easier for me to build it on the side and swap the engines once this one was fully assembled with new internals.

Well, last month we pulled the engine apart and sent it out to the machine shop… here’s what the piston looked like:



Now, it needs a fair amount of machine work; block is being bored for 96mm pistons, cylinder heads are going to be reworked as well, balancing, etc.

My question is… with this much damage previously inflicted on the engine, is it still going to be a good, “safe” core to use for my build? I’m putting a considerably amount of money into this engine (to me at least, lol) and want to make sure everything’s going to be good and hold up.

Also, is there anything else you would replace on this engine? (I’m planning on using stock camshafts, valve springs, retainers, valves, etc.)

Thanks!

 

Wow that piston is toast.

 

Looking at the photo of the piston it's a bit hard to believe the guy you bought the engine from was telling you the truth when he said, "it was running but had low compression in one cylinder." If he was lying to you about that, then one has to wonder what else he was lying about. I don't know much about rebuilding engines, but like you said you will be putting a lot of money into your build, so unless you know enough to spot potential problems on your own you might consider getting someone with more experience to look things over before you get too deep into your bank account.

 

the answer is still the same as Hal's #3 post. if everything comes out of the machine shop straight and clean, you should be fine.

 

Your machinist will answer better then any of us will.

 

More like 0 compression on one cylinder LOL

 

Exactly correct... Your machinist should be able to inspect the block, crank, dowels, etc... to see how it all looks. Might be a good idea if you have engine parts from that seller and everything is apart to inspect your timing chain slides and cam gears.

Big thing is to make sure you have the entire rotating assembly balanced after having all the machine work done... You could have a fantastic build,, not worth skimping on something small like balancing to have a huge issue later on.