Balancer questions

GTSteed89 · 09-01-2003, 01:51 PM

Hello everyone. I have a major problem that I need resolved in a hurry. Yesterday at the track the backing plate for the balancer somehow broke off. I am confused as to how all these balancers work and stuff. How are they counterweighted? Are the counterweights keyed so they can't go on wrong? The balancer I had says SFI approved converted to 28oz. Now, this don't tell me much. If anyone can help PLEASE DO!! I need to order a new one soon. I want to go with ATI or Fluidampr. I have the 5.0 HO timing cover and the balancer is a 4 hole. Thank you for help.

mustangII460 · 09-01-2003, 03:57 PM

I might be missing something in your post but, If you have a 89 motor it should have a 50oz Harmonic Balancer & flexplate. Unless it was somehow changed when the motor was built?

Pre-1980 motors used 28.2 oz Balancer and flexplate.

Either way the balancer is keyed, to only fit one way on the crank. ( For dummies like me)

If a 28.2 oz was bolted onto a late model 5.0 it should have gave a good vibration. Maybe thats why your balancer came apart?

GTSteed89 · 09-01-2003, 04:45 PM

Its a stroked 351. I should have made that clear.

mustangII460 · 09-01-2003, 05:15 PM

Hope I didn't sound harsh.

351 balancer and flexplate are interchangable with the 302 etc. And the years still apply. The small blocks are the same.

If it is a pre-1980 motor it still will use a 28.2 oz. Just go ahead and order a fluid dampner, they work great but a little pricy. Just bolts on one way.

I had a TCI rattler a few years back, annoying.

Z28EATR · 09-02-2003, 02:32 PM

i have a 331 with a 28 oz fluidamper i bought from dirttrackthunder.com for 129 or 139 i think, it was really cheap but you have to order a special spacer for it to fit, i bought my spacer from professional products dealer for 15 bucks i think it was, the part number was 8006 or 81006 if i remember right.

09-01-2003, 01:51 PM	#1
GTSteed89 Registered Member Join Date: Mar 1999 Location: Leesport, PA USA Posts: 24	Balancer questions Hello everyone. I have a major problem that I need resolved in a hurry. Yesterday at the track the backing plate for the balancer somehow broke off. I am confused as to how all these balancers work and stuff. How are they counterweighted? Are the counterweights keyed so they can't go on wrong? The balancer I had says SFI approved converted to 28oz. Now, this don't tell me much. If anyone can help PLEASE DO!! I need to order a new one soon. I want to go with ATI or Fluidampr. I have the 5.0 HO timing cover and the balancer is a 4 hole. Thank you for help. __________________ 89GT, 392, AFR 185's, 11.30:1 compression, Victor Jr., 241/251 dur. @.050 with .570 lift with 1.72's, 750 Speed Demon,1 3/4 longtubes, C4 w/ 8in., 3.73's, Detroit Locker, sway bar off front, Moroso Trick drag springs on all 4 corners, Pro3I control arms with adjustable spring jack, HPM Double adjustable uppers, solid bushings, 70/30's, subframes, 3" X-pipe, 2 chamber flows (3") 11.05 @ 120 1.51 60ft. on 26x10 Hoosier slicks. 11.06 @ 121 1.54 60ft. with the 8 inch and 26x10 Mickey slicks.

09-01-2003, 04:45 PM	#3
GTSteed89 Registered Member Join Date: Mar 1999 Location: Leesport, PA USA Posts: 24	Its a stroked 351. I should have made that clear. __________________ 89GT, 392, AFR 185's, 11.30:1 compression, Victor Jr., 241/251 dur. @.050 with .570 lift with 1.72's, 750 Speed Demon,1 3/4 longtubes, C4 w/ 8in., 3.73's, Detroit Locker, sway bar off front, Moroso Trick drag springs on all 4 corners, Pro3I control arms with adjustable spring jack, HPM Double adjustable uppers, solid bushings, 70/30's, subframes, 3" X-pipe, 2 chamber flows (3") 11.05 @ 120 1.51 60ft. on 26x10 Hoosier slicks. 11.06 @ 121 1.54 60ft. with the 8 inch and 26x10 Mickey slicks.

09-02-2003, 02:32 PM	#5
Z28EATR Registered Member Join Date: Jun 2000 Location: Florence, KY,USA Posts: 210	i have a 331 with a 28 oz fluidamper i bought from dirttrackthunder.com for 129 or 139 i think, it was really cheap but you have to order a special spacer for it to fit, i bought my spacer from professional products dealer for 15 bucks i think it was, the part number was 8006 or 81006 if i remember right. __________________ 88 LX 5.0 Ragtop "Desire" 14.18 @ 99.65 mph Best 60ft 2.19 YUK!!!! Best Mph 98.9 Slicks 13.86 @ 97.9 mph 60ft 1.93 yeah!!! Mod Specs

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09-01-2003, 03:57 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	I might be missing something in your post but, If you have a 89 motor it should have a 50oz Harmonic Balancer & flexplate. Unless it was somehow changed when the motor was built? Pre-1980 motors used 28.2 oz Balancer and flexplate. Either way the balancer is keyed, to only fit one way on the crank. ( For dummies like me) If a 28.2 oz was bolted onto a late model 5.0 it should have gave a good vibration. Maybe thats why your balancer came apart?

09-01-2003, 05:15 PM	#4
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Hope I didn't sound harsh. 351 balancer and flexplate are interchangable with the 302 etc. And the years still apply. The small blocks are the same. If it is a pre-1980 motor it still will use a 28.2 oz. Just go ahead and order a fluid dampner, they work great but a little pricy. Just bolts on one way. I had a TCI rattler a few years back, annoying.