SBF Timing
- Thread starter rob2078
- Start date
Screaming Metal
Active Member
Well, all you have to do is to fabricate up a pointer that you like, install a piston stop thru your #1 plug hole, either install a degree wheel, but since I build racing motors, I have a quick band that goes around the harmonic balancer that has the degrees etched into it. You can use a timing tape that comes from Mr. Gasket or whoever. Rotate the crank one way till you lightly bump the stop. Set your tape & pointer to 0, rotate the otherway will you bump the stop, record that number.
Pull your stop, rotate your crank so your reading 1/2 of what the total range that you went from stop to stop.....this is TDC. Fab up your pointer your timing mark on the harmonic balance should be close. I usually use a engraver, carefully etch a New mark.
What I normally do is add the new pointer looking however you like it, lined up to the new mark so it lines up perfectly. Then I get a combo square set with a centerfinding attachment, I line up on the new timing mark, then I scribe down onto the center hub with a mark. I add white marker to both the newly found TDC mark, and to the line on the hub.
If your rubber ever slipped in your harmonic balancer, all you have to do is add your centerfinding head and rescribe your TDC mark, adding a new white paint (I use white Markel Metal Marker, won't come off even with a pressure washer, if cleaned before application).
Hope this helps....
Pull your stop, rotate your crank so your reading 1/2 of what the total range that you went from stop to stop.....this is TDC. Fab up your pointer your timing mark on the harmonic balance should be close. I usually use a engraver, carefully etch a New mark.
What I normally do is add the new pointer looking however you like it, lined up to the new mark so it lines up perfectly. Then I get a combo square set with a centerfinding attachment, I line up on the new timing mark, then I scribe down onto the center hub with a mark. I add white marker to both the newly found TDC mark, and to the line on the hub.
If your rubber ever slipped in your harmonic balancer, all you have to do is add your centerfinding head and rescribe your TDC mark, adding a new white paint (I use white Markel Metal Marker, won't come off even with a pressure washer, if cleaned before application).
Hope this helps....
Screaming Metal
Active Member
I've seen the stock marks be a little off sometimes, thats why I suggested you set up to find perfect TDC. You could however line things up with the stock mark, and then switch things over, make a new mark and add your pointer where-ever you want. As long as you can see it and aim your timing light at it.
Though without checking it with a piston stop, I would not completely trust it.
Screaming Metal
Active Member
Your crank being out of balance will not affect your timing, it will only destroy your bearings, rods, and crank, in-that-order. There is no 'alittle outta balance', it will either be something the motor can live with or something that'll cause damage . How long it will live is directly proportional to how hard the vibration is.... Its either right or wrong. its done by machine by experienced operators in a machine shop setting, adding or removing metal from the recipicating/rotating assembly.
If your asking will the timing marks line up, I don't know, I don't trust things that I have not done myself. You could always take it to someone that has a optical comparator and check the keyway to timing mark in degrees if you know a tool and die maker or Industrial machinist....
It takes no longer to take your time & do it right than it does to screw it up, and dump a bunch of money into correcting the problem that could have been avoided in the 1st place.....
I've seen a bunch of externally balanced motors fitted with internally balanced flexplates/flywheels and or harmonic balancers only to granade later....its best not to mess with the balancing unless you know exactly what your doing!
THERES A BIG DIFFERENCE BETWEEN BALANCING A TIRE AND BALANCING A MOTOR....
If your asking will the timing marks line up, I don't know, I don't trust things that I have not done myself. You could always take it to someone that has a optical comparator and check the keyway to timing mark in degrees if you know a tool and die maker or Industrial machinist....
It takes no longer to take your time & do it right than it does to screw it up, and dump a bunch of money into correcting the problem that could have been avoided in the 1st place.....
I've seen a bunch of externally balanced motors fitted with internally balanced flexplates/flywheels and or harmonic balancers only to granade later....its best not to mess with the balancing unless you know exactly what your doing!
THERES A BIG DIFFERENCE BETWEEN BALANCING A TIRE AND BALANCING A MOTOR....
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