ign timing clarification needed, please
04-28-06, 01:10 PM
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ign timing clarification needed, please
I know this topic has been discussed quite a bit, but with all my experience I am confused....
I have been reading a lot but still am still not 100% clear about the standard timing and Yaw Power recommendation of best timing setpoint of 26* BTDC (Leading).
On an 13B SE, the FSM shows a setting of 5* ATDC (leading) at idle.
SO with 14* mechanical advance per FSM, if I add the 14* advance to the initial 5* ATDC, this gives me 9* BTDC at full mechanical advance. ( the AFTER and BEFORE can get confusing).
Is this correct?
My next question is, if this is correct, then 26* vs 9* = 15* difference between the std. full advance and the recommendation by Yaw Power.
That seems like a big difference, but I can live with that. is my thinking correct?
Then I will need to mark my pulley correctly at 9 and 26 BTDC to verify and test the 2 settings, but I'll skip that for now...
thanks
I have been reading a lot but still am still not 100% clear about the standard timing and Yaw Power recommendation of best timing setpoint of 26* BTDC (Leading).
On an 13B SE, the FSM shows a setting of 5* ATDC (leading) at idle.
SO with 14* mechanical advance per FSM, if I add the 14* advance to the initial 5* ATDC, this gives me 9* BTDC at full mechanical advance. ( the AFTER and BEFORE can get confusing).
Is this correct?
My next question is, if this is correct, then 26* vs 9* = 15* difference between the std. full advance and the recommendation by Yaw Power.
That seems like a big difference, but I can live with that. is my thinking correct?
Then I will need to mark my pulley correctly at 9 and 26 BTDC to verify and test the 2 settings, but I'll skip that for now...
thanks
04-28-06, 10:35 PM
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SO with 14* mechanical advance per FSM, if I add the 14* advance to the initial 5* ATDC, this gives me 9* BTDC at full mechanical advance. ( the AFTER and BEFORE can get confusing).
Um, don't forget about the vacum advance. Not sure how many degrees it is though.
04-28-06, 11:47 PM
#3
[QUOTE=capt murph]
I have been reading a lot but still am still not 100% clear about the standard timing and Yaw Power recommendation of best timing setpoint of 26* BTDC (Leading).
[/QUOTE=capt murph]
Markt the pulley. With vacuum advance disconnected, rev the RPM above 4K and then set the timing. Dont be afraid to play with different timing settings as not all engines are alike. 10* difference works for me.
I have been reading a lot but still am still not 100% clear about the standard timing and Yaw Power recommendation of best timing setpoint of 26* BTDC (Leading).
[/QUOTE=capt murph]
Markt the pulley. With vacuum advance disconnected, rev the RPM above 4K and then set the timing. Dont be afraid to play with different timing settings as not all engines are alike. 10* difference works for me.
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