A lttle Z help, please
I have a problem, At Nashville this past weekend after 3 laps in practice I entered Turn 2 and the motor went waaahhhhh and bogged down when I went to WOT. It would catch up a little but wouldn't pull above 4500 rpm. I chased the problem all weekend and even had GREAT help from David Plott.
Where should I start checking?
FWIW, I have had intermittent problems with a break up at 4500 rpm and then a loss of 5-750+ rpm on the straights when the problem appears. I found that hitting the rumble strips at CMP 8 would keep the car running fine for a couple of laps. I assumed it was fueling or a ignition problem.
So far I have rebuilt the fuel pump, replaced cell foam, filter, installed MSD box, new coil, cap, and wires. I put in new float valves, reset float levels, checked and re-checked timing. Adjusted and re-adjusted carbs. Changed pertronix, distributor with only minor results. CHecked alternator voltage, upped fuel pressure. Added fuel, etc.
This problem does not occur until the engine is under load. No break up in the garage and will rev to 7k.
I am at a loss. This problem seems heat related. I had a thought last night that I am wondering if I get a voltage loss through the master switch since the MSD box is connected there.
I chased this problem all weekend. The first three practice laps I saw 7k on the front straight and the car pulled great. then waaaaahhhh and problems the rest of the weekend.
Where do I look now?
BTW, I am on the road today so I may be a little slow in response
Paul
Paul Ballance
Tennessee Valley Region (yeah it's in Alabama)
ITS '72
1972 240Z
"Experience is what you get when you're expecting something else." unknown
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