Timing Changes!!
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4thHorseman
774 Super Street
6 posters
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Timing Changes!!
774 Super Street June 1st 2012, 5:02 pm
Ok here is a good one. My buddy put together a SCJ headed 473 and has it in a 1965 Mustang that weighs 2550 with him in it. He took it to the track about a month ago and the best run was a 9.57 @ 139 mph. Not bad
but should be better. The engine was dropping oil psi under braking past the finish line. He brought the car home and replaced the oil pan and pick up with a new Canton. He started the engine and ran it to temp and everything was fine. He then hooked up the trailer to load the car and the car wouldn't start. After some checking he found the timing had changed. So, he timed it again and ran it with no issues, shut it off and it would not restart due to the timing changing again. So he has now checked the damper, pulled the front cover and checked the timing chain, tested the MSD 7al 2 box, removed the distributor and looked it over and anything else you can think of. The only thing even remotely wrong was the timing advance plate was a little loose from when he originally locked the timing out of the MSD 8580 billet distributor. He has now tightened that and is going back together. Any ideas?
but should be better. The engine was dropping oil psi under braking past the finish line. He brought the car home and replaced the oil pan and pick up with a new Canton. He started the engine and ran it to temp and everything was fine. He then hooked up the trailer to load the car and the car wouldn't start. After some checking he found the timing had changed. So, he timed it again and ran it with no issues, shut it off and it would not restart due to the timing changing again. So he has now checked the damper, pulled the front cover and checked the timing chain, tested the MSD 7al 2 box, removed the distributor and looked it over and anything else you can think of. The only thing even remotely wrong was the timing advance plate was a little loose from when he originally locked the timing out of the MSD 8580 billet distributor. He has now tightened that and is going back together. Any ideas?
774 Super Street- Posts : 26
Join date : 2011-03-14
Re: Timing Changes!!
4thHorseman June 1st 2012, 5:35 pm
What chain, dizzy? How much we talking here? Details please.
4thHorseman- Posts : 400
Join date : 2009-08-13
Location : Albuquerque, NM
Re: Timing Changes!!
774 Super Street June 1st 2012, 5:43 pm
Cloyes Quick Adjust Timing Chain. Timing changes up to 60 degrees.
774 Super Street- Posts : 26
Join date : 2011-03-14
Re: Timing Changes!!
Tommyj466 June 1st 2012, 6:09 pm
Roll pin on dizzy sheared? May be enough interference fit there to hold timing adjustment for Short period of time.
TJ
TJ
Tommyj466- Posts : 322
Join date : 2009-01-06
Location : Versailles Ky
Re: Timing Changes!!
maverick532 June 1st 2012, 10:00 pm
ck stator in distributor it is supposed to be welded to shaft and should not move , had this exact same problem with msd distributor before drove me nuts .
maverick532- Posts : 181
Join date : 2010-11-25
Age : 62
Location : orlando fla.
Re: Timing Changes!!
powerstrokeace June 1st 2012, 11:11 pm
Tommyj466 wrote:Roll pin on dizzy sheared? May be enough interference fit there to hold timing adjustment for Short period of time.
TJ
Ran in to the same problem. The roll pin shears and you really can tell till it frees up from the sheared end gripping the shaft. I did this 3 time last year and so far this year all i did was go from 20-50 to 10-30 oil to see what happens. The best idea i heard was to drill out the hole to X/XX size and then install a roll pin that size and then a roll pin inside of that one. Not sure what forum it was on but do a search under roll pins or sheared roll pins and see what comes up.
Ace
powerstrokeace- Posts : 1496
Join date : 2009-09-07
Location : colorado
Re: Timing Changes!!
774 Super Street June 12th 2012, 10:08 am
The issue turned out to be the reluctor for the magnetic pickup had moved in the distributor. It was then out of phase with the rotor causing the issue. That was fun!
774 Super Street- Posts : 26
Join date : 2011-03-14
Re: Timing Changes!!
rmcomprandy June 12th 2012, 11:13 am
Use another KNOWN GOOD ignition box ... what you describe has happened before with a bad electrical part in the box.
rmcomprandy- Posts : 6157
Join date : 2008-12-02
Location : Roseville, Michigan -
Re: Timing Changes!!
774 Super Street June 12th 2012, 11:50 am
Randy,
We installed another distributor and the issue is solved. The ignition box was next. Thanks
We installed another distributor and the issue is solved. The ignition box was next. Thanks
774 Super Street- Posts : 26
Join date : 2011-03-14
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