Oil in cylinder 1 and 2

[08vapor500]

Changed spark plugs on the 500 after a lean issue under WOT. Borescoped each cylinder and this is what I find in cylinder 1 and 2. The car does not smoke at all when idling or under load. Plug in cylinder one showed slight fouling but was dry when pulled. Any insight is appreciated.

 

[gt347mustang]

Leakdown time. If you go looking for trouble you'll probably find it.

 

[Sielmo]

Changed spark plugs on the 500 after a lean issue under WOT. Borescoped each cylinder and this is what I find in cylinder 1 and 2. The car does not smoke at all when idling or under load. Plug in cylinder one showed slight fouling but was dry when pulled. Any insight is appreciated.

Yep, I'd do a pressure check. relatively easy to do to determine your cylinder PSI. I did a check on mine with the TB still on and I registered 160psi which is normal.

 

[08vapor500]

Conducted the compression test and all cylinders were with 5PSI of each other. Going to get rid of this email tune and get it dyno tuned this next week.

 

[Sielmo]

Glad to hear, sounds like your engine is fine. Curious about the oil though. Do you have a catch can? Are you running cams? What was your pressure?

 

[RedVenom48]

@08vapor500 You still may want to do a cylinder leak-down check. Better indicator of what condition the rings are at. Good compression is excellent news, but the rings could still be worn out.

 

[08vapor500]

no catch can on the motor with stock Cams. The pressure was 160 in each cylinder with one at 155. Car has 15k miles with only 3k on the new tvs setup.

 

[Catmonkey]

You have spark plug hole seals in the valve cover. They can leak and oil will pool at the bottom of the plug and when you pull the plug, the oil goes down the spark plug hole.

 

[Catmonkey]

double post

 

[08vapor500]

^ Makes sense, when I pulled the plugs for the compression test I saw the same little amount of oil in the same spot on top of the piston.

 

[Sielmo]

You have spark plug hole seals in the valve cover. They can leak and oil will pool at the bottom of the plug and when you pull the plug, the oil goes down the spark plug hole.

Oh jeez....totally forgot about this. That's likely the issue

 

[08vapor500]

Ran leak down with harbor frieght leak down kit. Car was sitting for around 2 hours.

1- (25-28) cylinder with oil residue
2- (15-18)
3- (18-20)
4- (20)
5-(20-22)
6-(15)
7-(20)
8-(20)

 

[gimmie11s]

Am I the only one who sees burnt piston crown exposing the top ring on that bottom pic?

Or is that carbon build up?



Sent from my iPhone using svtperformance.com

 

[08vapor500]

It was carbon build up. I borescoped that same piston today and it looked normal.