While researching going to an ATT on my smoking 6.2 repower mess the question came up without a clear answer of if there are any air flow differences between 6.2 and 6.5 heads.
I need to know if there is any differences in the heads. And also if the ATT would be affected by this.
I have pre 1988 6.2 heads on my 1993 pickup with all the 6.5 turbo stuff. She is painting the trailer and fender with black soot. 1 qt of oil per 1000 miles more or less. (6.2 longblock with 6.2 IP ½ turn up, 6.5 injectors pop tested good.)
This is a light black smoke daylight and sometimes a gray smoke in headlights. ½ or more throttle loaded with the trailer is visible smoke in headlights. Looks like a fog bank going out the exhaust in the head lights!
I am down to a bad turbo or other air flow restrictions. The 6.5 engine failure melted a hole in the cracked and scuffed #1 piston. However 4-5 glow plugs were half missing. This debris went through the turbo no doubt. A inspection through the exhaust side did not show any damage to the exiting turbo vanes.
I am down boost over the 6.5 at low RPM and only after turning up the TM 6 turns do I see 14 PSI at 3000 RPM.
EGT’s back up lack of airflow peaking out at 1400 if the gauge is accurate. Engine has 7000 miles at these sustained EGT’s so the gauge is off 200 or more high.
No coolant loss. Blowby is very minimal and handled by the CDR system.
Changing the advance on the engine did not affect the low boost. (Over advance can cause low boost.)
Truck tows all the time on insane grades.
I need to know if there is any differences in the heads. And also if the ATT would be affected by this.
I have pre 1988 6.2 heads on my 1993 pickup with all the 6.5 turbo stuff. She is painting the trailer and fender with black soot. 1 qt of oil per 1000 miles more or less. (6.2 longblock with 6.2 IP ½ turn up, 6.5 injectors pop tested good.)
This is a light black smoke daylight and sometimes a gray smoke in headlights. ½ or more throttle loaded with the trailer is visible smoke in headlights. Looks like a fog bank going out the exhaust in the head lights!
I am down to a bad turbo or other air flow restrictions. The 6.5 engine failure melted a hole in the cracked and scuffed #1 piston. However 4-5 glow plugs were half missing. This debris went through the turbo no doubt. A inspection through the exhaust side did not show any damage to the exiting turbo vanes.
I am down boost over the 6.5 at low RPM and only after turning up the TM 6 turns do I see 14 PSI at 3000 RPM.
EGT’s back up lack of airflow peaking out at 1400 if the gauge is accurate. Engine has 7000 miles at these sustained EGT’s so the gauge is off 200 or more high.
No coolant loss. Blowby is very minimal and handled by the CDR system.
Changing the advance on the engine did not affect the low boost. (Over advance can cause low boost.)
Truck tows all the time on insane grades.
