Researching Engines 671TI in '79 37C

[Captain Ralph]

Sorry. 1-15/32" or 1.468. Fir some reason I can't edit posts on my phone.

Not sure where the 1.148 comes from. Usually all N90s are 1.460.
0.008 is not much in the big picture but you are firing a bit late IMO.
Do you remember where they were at before your tune-up (tight or loose)?

Hope my below notes help.

1978 engine
Turbo
Intercooled
NON By-Passes blower

N90 injectors.
1.14 A/R turbo horns
Air box pressure 37.7 to 39.5 inches mercury (18.5 to 19.5 psi) @ loaded WOT
Fuel pressure 35 to 50 psi
Coolant temperature 160-185° f

OR

N90 injectors.
1.32 A/R turbo horns
Air box pressure 32.2 to 34.0 inches mercury (16 to 17 psi) @ loaded WOT
Fuel pressure 35 to 50 psi
Coolant temperature 160-185° f


How to tell your tune and WOT RPM settings;
Look at the turbo. The air side made of aluminum facing forward, blowing air into the engine.
Look for a cast number that says 1.** A/R

1.00 A/R min loaded RPM 1800
1.14 A/R min loaded RPM 2100
1.32 A/R min loaded RPM 2300

Add 200 RPM for max high idle (no-load max WOT)

My notes have nothing on the cam shaft advanced. I then assume not on any of the above.
This can be confirmed with the serial number with a real DDC shop.

 

[Captain Ralph]

Fir some reason I can't edit posts on my phone.

I have a heck of a time editing on my phone also.

 

[Bob Bradley]

Btw, I also checked fuel pressure. 20psi at idle. 60psi at 1800 rpm. Other (good) engine was comparable at 64psi.

 

[cenger]

If you have N90 injectors your HP rating is 410 and you should be at 2300 RPM loaded,2450 unloaded. Check the unloaded RPM to eliminate running gear issues.