distributor jump. help.
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Joined: Oct 2011
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distributor jump. help.
ive searched these forums and found nothing so...
i have a 69 f100, 3 on the tree, 302, edlebrock 750 carb and 289intake manifold, 87 f150 heads, hooker headers, flowmasters, mild cam, flat tapped lifters, my problems is....
i was doing my timing an had my cap off (i have points) i was turning over my motor my hand and when i got my rotor to about 11:00 and kept turning my motor it instead of smoothly moving jumped a little bit but only in this one spot.
my truck starts and runs sounds fine at idle and at a rev but is breaking up at a slight rev. everything seems to be in working order no leaks and everything hooked up
i have a 69 f100, 3 on the tree, 302, edlebrock 750 carb and 289intake manifold, 87 f150 heads, hooker headers, flowmasters, mild cam, flat tapped lifters, my problems is....
i was doing my timing an had my cap off (i have points) i was turning over my motor my hand and when i got my rotor to about 11:00 and kept turning my motor it instead of smoothly moving jumped a little bit but only in this one spot.
my truck starts and runs sounds fine at idle and at a rev but is breaking up at a slight rev. everything seems to be in working order no leaks and everything hooked up
Junior User
Joined: Mar 2012
Posts: 62
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From: DeKalb,Il--moving to Ariz
Sounds like you may have a small flat spot on the Dist cam or there is too much slop in the timing chain. Hard to tell but that's my two thoughts. Also a 750 Carb is TOO MUCH Carb for a 302. You would be better off with a 500CFM . A 750CFM would be a good fit for a big block but not a small block.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
6*BTDC is retarded, litterally. That was one of Ford's worst mistakes in recommending it for tuning the engine. 10* BTDC should be the very minimum initial timing on these engines. You might also want to verify that the balancer's outer ring hasn't slipped, that will both throw of the timing and the balance of the crankshaft. To check this, you need to get the #1 piston as close to TDC on the firing stroke as you can. Once you have it there, then look down at the timing pointer and balancer, these two should be aligned if it's at TDC on the firing stroke. Might also want to check for slack in the timing set. To do this, remove the distributor cap, then using a breaker bar and 15/16 socket on the balancers center bolt. Then slowly move the breaker bar and note how far the bar moves before the rotor in the distributor cap moves. One quarter rotation of the bar (90*) equals one cylinder's turn in the firing order.
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