Carbon build up. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nismo240sxdrifter · 08-20-2017, 06:08 AM

Hey guys. The internet seems to be pretty vague so I thought I'd ask here. How much carbon build up is normal to see on an SR that was rebuilt 2 years ago? I am about to purchase one to use while I rebuild my current blown one. Compression is great at 158-163 across the motor, top of the pistons are dirty, but dont seem oily. Thanks for the opinions.

5280VertDET · 08-20-2017, 01:03 PM

I know this isn't exactly what you are looking for, but Chris Fix did a borescope test on some motors.

Check the description on this for the other ones. Should give you a visual comparison to base your pistons on...

https://www.youtube.com/watch?v=u6UeJXkzDW8

08-20-2017, 06:08 AM	#1
nismo240sxdrifter Zilvia Junkie Join Date: Jan 2008 Location: Deep south Posts: 443 Trader Rating: (12) Feedback Score: 12 reviews	Carbon build up. Hey guys. The internet seems to be pretty vague so I thought I'd ask here. How much carbon build up is normal to see on an SR that was rebuilt 2 years ago? I am about to purchase one to use while I rebuild my current blown one. Compression is great at 158-163 across the motor, top of the pistons are dirty, but dont seem oily. Thanks for the opinions.

08-20-2017, 01:03 PM	#2
5280VertDET Nissanaholic! Join Date: Aug 2013 Location: Denver Age: 41 Posts: 2,052 Trader Rating: (14) Feedback Score: 14 reviews	I know this isn't exactly what you are looking for, but Chris Fix did a borescope test on some motors. Check the description on this for the other ones. Should give you a visual comparison to base your pistons on... https://www.youtube.com/watch?v=u6UeJXkzDW8 __________________ S13 Vert \| SR \| PE1420 \| 5-Speed \| 15x9.5 - 0 \|