For the D15B7 1.5L SOHC engine, the ignition timing is set to 16° BTDC (Before Top Dead Center) at idle, with a range of 12-20° BTDC. The valve timing is as follows:
* Intake valve opens: 19° BTDC
* Intake valve closes: 41° ABDC (After Bottom Dead Center)
* Exhaust valve opens: 45° BBDC (Before Bottom Dead Center)
* Exhaust valve closes: 8° ATDC (After Top Dead Center)
For the D16A6 1.6L SOHC engine, the ignition timing is set to 12° BTDC at idle, with a range of 8-16° BTDC. The valve timing is as follows:
* Intake valve opens: 18° BTDC
* Intake valve closes: 38° ABDC
* Exhaust valve opens: 42° BBDC
* Exhaust valve closes: 10° ATDC
For the B16A1 1.6L DOHC engine, the ignition timing is set to 16° BTDC at idle, with a range of 12-20° BTDC. The valve timing is as follows:
* Intake valve opens: 19° BTDC
* Intake valve closes: 41° ABDC
* Exhaust valve opens: 45° BBDC
* Exhaust valve closes: 8° ATDC
It's important to note that these are general specifications and actual timing values may vary slightly depending on factors such as engine wear and modifications. It's recommended to refer to the manufacturer's specifications or a reliable service manual for the exact timing specifications for your specific 1991 Honda Civic model and engine type.
