Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - First post: What happened to my SR20DET cylinder walls??

astro.domine · 05-11-2020, 10:29 PM

I'm in need of the input of an experienced engine builder.

I just tore down my SR because the rings didn't seat well after rebuild (was running too rich), and I'm concerned about the cylinder wear. Had ~13,000mi on rebuild.

As you can see, the exhaust side has vertical streaks on all cylinders - is that normal? But what's worse is cylinder #1, which has circular grooves deep enough to feel with a fingernail. What would cause this??

Do you think a hone and new rings will suffice?

Cylinder #1
https://imgur.com/IawmjVl
#2
https://imgur.com/bbZ5SHK
#3
https://imgur.com/VATwdfs
#4
https://imgur.com/Yds4WJw

Specs:
-Wiseco 86.5mm pistons (bored to match)
-Eagle Rods
-ACL Bearings
-ARP Head and Main Studs (crank was line-bored)

05-11-2020, 10:29 PM	#1
astro.domine Join Date: Jan 2019 Location: Seattle Age: 32 Posts: 4 Trader Rating: (0)	First post: What happened to my SR20DET cylinder walls?? I'm in need of the input of an experienced engine builder. I just tore down my SR because the rings didn't seat well after rebuild (was running too rich), and I'm concerned about the cylinder wear. Had ~13,000mi on rebuild. As you can see, the exhaust side has vertical streaks on all cylinders - is that normal? But what's worse is cylinder #1, which has circular grooves deep enough to feel with a fingernail. What would cause this?? Do you think a hone and new rings will suffice? Cylinder #1 https://imgur.com/IawmjVl #2 https://imgur.com/bbZ5SHK #3 https://imgur.com/VATwdfs #4 https://imgur.com/Yds4WJw Specs: -Wiseco 86.5mm pistons (bored to match) -Eagle Rods -ACL Bearings -ARP Head and Main Studs (crank was line-bored)