Stock Cam Duration?
1 - 6 of 6 Posts
Luckily I have a '93.5 Supra NCF...
2JZ GTE:
Intake opens at 3deg BTDC, closes at 50 deg ABDC
(intake duration is thus 233 degrees)
Exhausut opens at 52 deg BBDC, closes at 4 deg ATDC
(exhaust duration is thus 236 degrees)
2JZ GE:
Intake opens at 3deg BTDC, closes at 50 deg ABDC
(intake duration is thus 233 degrees)
Exhausut opens at 53 deg BBDC, closes at 3 deg ATDC
(exhaust duration is thus 236 degrees)
...notice that according to the book, autos and manuals have the same cams.. and the turbo and NA have the same duration, except that the NA's exhaust timing is retarded by 1 degree compared to the TT's.
Andi
2JZ GTE:
Intake opens at 3deg BTDC, closes at 50 deg ABDC
(intake duration is thus 233 degrees)
Exhausut opens at 52 deg BBDC, closes at 4 deg ATDC
(exhaust duration is thus 236 degrees)
2JZ GE:
Intake opens at 3deg BTDC, closes at 50 deg ABDC
(intake duration is thus 233 degrees)
Exhausut opens at 53 deg BBDC, closes at 3 deg ATDC
(exhaust duration is thus 236 degrees)
...notice that according to the book, autos and manuals have the same cams.. and the turbo and NA have the same duration, except that the NA's exhaust timing is retarded by 1 degree compared to the TT's.
Andi
Maybe that's why I gained power by retarding my exhaust camshaft by 4.5 marks (equal to 4.5 cam degres or, in crank degrees as cam duration is quoted, 9 degrees).Ebanks said:That's wild.. I would expect the timing to be retarded on the turbo... I guess that is why I am not an engineerI also think it is pretty bizarre that they are the same specs, weird!
-Ethan
Heh....
Andi
1 - 6 of 6 Posts
Join the discussion
