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Senior Member
Join Date: Sep 2001
Location: Chesapeake, VA
Posts: 1,699
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Yet More MFI Tweaking
Sigh- I know I am getting closer. Everything is in and running, I am still off somewhere in the ignition and timing, but not sure what. The dwell is at 31, and the timing is set correctly, but the starting is very odd, as if it is having problems getting over TDC then starts to fire. I still have the intake covers off and the motor sounds kind of muted as if I am not getting full cobustion. The idle once warmed is still on the high side, but much more stable with the new throttle bodies. I only had BP8ES plugs which I think may be too cold for this motor. Plan on picking up some BP7ES' as they seemed to work better. Any help is appreciated!!!!
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Chris 1988 911 Carrera Targa (driving project started JAN 2022) 1970 911E - Long since gone 1972 911 Targa - gone 1987 911 Carrera - gone Retired FA-18C Driver |
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03-26-2004, 03:17 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Chris,
Your dwell is out of spec -- 35° is min. ... but I'm not sure that is really an issue. Is the gap about 0.014", or is it less? 31° sounds like the gap might be a bit too tight. What is youe 'basic' initial timing when you turn the engine over by hand? TDC - 5° BTDC should be OK.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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03-26-2004, 03:47 PM
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Senior Member
Join Date: Sep 2001
Location: Chesapeake, VA
Posts: 1,699
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OK - that makes sense Warren, the motor sounded better at around 40 on the dwell. The gap is a tad less than .014, I seem to have to go about .37mm or so to get the dwell correct. I remember kind of being in the same place last time around when I was narrowing in on the tune. I really believe that a part of my problem is the plugs being too cold.
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Chris 1988 911 Carrera Targa (driving project started JAN 2022) 1970 911E - Long since gone 1972 911 Targa - gone 1987 911 Carrera - gone Retired FA-18C Driver |
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03-26-2004, 03:57 PM
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