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Tuning question I can’t figure out. HELP

Posted By Melly Last Month
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Melly
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First I have a 57, Ford 312 , 57 dizzy , Holley 570 CMF carb. New plugs, was running good. Started to notice that under rpm around 3500 plus rpm. The tach started showing some goofy behavior.. would pull steady till the 3500* range motor stared a slight surging, tach. Show crazy needle movement, but rpm sounds some what steady.
When trying to find out what was happening. Check vacuum it showed 18 psi, timing 9 deg .
Look thing over but do not know what it might be. As before I need you great advice as to what going on and where, and what to do to fix issues.
yknot
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I believe that you can set your initial timing at 12. should improve things.
Robs36Ford
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Tach depends on dizzy for values, If dizzy is misbehaving so will tach.

Check points, condenser and advance mechanism. Also wiring to and from it.


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

paul2748
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Is this a sedan or a Tbird.  Is it a distributor driven tach if not a TBird?


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
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Melly
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It is a fairlane, std. dizzy not tach. Drive.
Florida_Phil
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Did you check to see if the ground wire is still in the distributor?  This is often left out of 57 distributors when they are reassembled. 


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Lord Gaga
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Disconnect the tach and see what happens.

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1960fordf350
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In your initial post,   are you saying the engine was surging around 3500rpm,   or just the tach?    Stick shift or auto?    You'd definetly feel a difference with a stick shift.   

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Joe-JDC
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What happens when you try to rev past 3500 rpm?  Does it smooth out and pull on up to ....what rpm?  Joe-JDC

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Melly
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3 spd with OD, while driving in 2nd gear if I put it to floor, pulls steady til 3500 rpm then can feel surges and tach is kind of goes crazy. If you stay on it the surging continues.
I do notice that there is no ballast resistor, do knot know if it has coil with that built in or not. This is in a 1955 Ford fairlane so wiring is 1955 wired to a1957 set if that makes a difference. That I don’t know.
Going to check to see if ground wire in dizzy is there. ( it is a 1957 Ford dizzy )


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