28oz. or 50oz. flywheel, what should I have used?

[Rotortrash]

Should've asked this at the BEGINNING of the 5 speed conversion, now I have an annoying vibration.

I installed a NEW 28oz. flywheel. Confident that everything is seated, I even used my calibrated torque wrench to torque everything.

Should I have used a 50oz. flywheel?

This is on a 1992 LX 5.0, all stock.

[G..]

Should've asked this at the BEGINNING of the 5 speed conversion, now I have an annoying vibration.

I installed a NEW 28oz. flywheel. Confident that everything is seated, I even used my calibrated torque wrench to torque everything.

Should I have used a 50oz. flywheel?

This is on a 1992 LX 5.0, all stock.

yes

[91CoupeMike]

50oz..

I bet that vibrates like a mother fucker.

[Rotortrash]

50oz..

I bet that vibrates like a mother fucker.

Its actually not too bad. Its smooth as silk at 1500-2000 in all gears. Even under acceleration, it dosen't start till around 3000, and I can pull it all the way to 5500 or so without it being too bad. It at its worst under decelleration of all things.

[G..]

If you only knew the damage you were doing with the wrong one on there. Vibrations whether you feel them or not are deadly to a engine

[Rotortrash]

If you only knew the damage you were doing with the wrong one on there. Vibrations whether you feel them or not are deadly to a engine

Oh I know, dont worry. This conversion has all of 25 miles on it so far, and now that I've learned the error of my ways, I will be replaceing the flywheel this weekend.

I'm a helicopter mechanic/pilot, I know all too well the dangers of even the slightest vibration!

[jason07]

Oh I know, dont worry. This conversion has all of 25 miles on it so far, and now that I've learned the error of my ways, I will be replaceing the flywheel this weekend.

I'm a helicopter mechanic/pilot, I know all too well the dangers of even the slightest vibration!

Can you not replace the harmonic balancer?

[Rotortrash]

Can you not replace the harmonic balancer?

Good question, I don't know. Hopefully someone thats been down this road before will chime in.

Sure would be easier to change the balancer than dropping the trans, again.

[G..]

Good question, I don't know. Hopefully someone thats been down this road before will chime in.

Sure would be easier to change the balancer than dropping the trans, again.

I believe the 50oz is needed to counter balance the engine. If you have a 90 model 302 HO it requires the 50oz on both ends unless you want vibration and premature engine failure

[Txstang1]

Can you not replace the harmonic balancer?

No , you would need to have to have the crank rebalanced in order to do that. The only solution is to replace the flywheel

[Baron Von Crowder]

I believe the 50oz is needed to counter balance the engine. If you have a 90 model 302 HO it requires the 50oz on both ends unless you want vibration and premature engine failure

Correct, it's dependent on the imbalance of the crank shaft

[Rotortrash]

I believe the 50oz is needed to counter balance the engine. If you have a 90 model 302 HO it requires the 50oz on both ends unless you want vibration and premature engine failure

I really appreciate the input, G.., and all the others. Looks like I get to spend some more time under my car. Yay me! That's what I get for getting in a hurry. I bought the flywheel locally so I could get the trans in a day earlier. Look where that got me. Live and learn I guess....

[Mach1]

28oz is for 351W and early 302's

[greenbullitt]

I really appreciate the input, G.., and all the others. Looks like I get to spend some more time under my car. Yay me! That's what I get for getting in a hurry. I bought the flywheel locally so I could get the trans in a day earlier. Look where that got me. Live and learn I guess....

i might have a spare one Jeff..

[IHaveAMustang]

28oz is for 351W and early 302's

Yep, I used a 28oz in my 84' 302. I honestly don't remember what balancer we used though...man it's been a long time since we restored her...getting foggy now.

But I remember installing the wrong flywheel as well (we thought since the trans was from a 93' GT we should match it...wrong)