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#1
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440 banging outta 5500 rpm
I have been running this 440 for three years now. Msd rev limited at 6500
Roller motor, demon 750, msd wires, billet msd distributor. I snapped a u joint Pulled the tranny to check it out sent the converter off for a new hub( it was worn and leaking). Put it all back together and now it sounds like the msd box is rev limiting at 5500. Runs a consistent 6.94 1/8. 60' is the same, turns 98 MPH. But starts the banging at the end of the 1/8. I used to run the 1/4 and with 456gears it was on the rev limit at the end of 1/4. I set the msd box to 2000 and checked it and it will limit at 2000. I set it to limit at 7000 made a pass and still missing t 5500. It's not popping, It sounds like rev limit. I changed the plugs, no diff. I had a fuel pump give up on me, it's got a new fuel pump. I. Don't have a fuel press. Gauge in the car its under the hood. Im not thinking fuel press. But not ruled out yet. I'm hoping for suggestions on this one. Thanks>>>>>> Wilson |
#2
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I would look at engine timing or possible valve spring pressures if everything else checks out ok.
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#3
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I would try without the limitator. Also check distributor.
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#4
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I checked distributor, also set the rev limit at 2000 fired it up it limits ok.
Set limit to 7000 and it won't make it past 5500 during a pass. I didn't mention I can get 6500 no problem in the burnout and hold it during the burnout. |
#5
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Check for bad grounds. Directly grounded to battery is usually the very best.
Just curious? How was the sprag/overunning clutch? |
#6
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Clutch was ok, sprag had problems. The planetary gear housing rolled on the shaft splines and I had to cut it out with a torch.
Grounds are good and direct to bat. Changing plug wires next. |
#7
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Check valve spring pressure, check coil, try closing up spark plug gap to .025" and see what that does.
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