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Old 05-01-2011, 02:45 PM
Jayme Duty Jayme Duty is offline
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flywheel questions

Many of you know that i did a 5-speed swap a few months ago. My donor truck was a 91 and my driver is a 94 factory turbo. I was just told lately that the flywheel for a 94 factory turbo is balanced different than a N/A truck. It makes no sense to me but i have a vibration above 2500rpm and thought just maybe this could be the problem. Anybody know if there is a difference in flywheels?
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-01-2011, 02:56 PM
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The factory turbo engine has larger piston pins, which means the piston assembly weight is different than tha NA engine.
I believe that IDI engines are externally balanced by weighted harmonic dampeners and weighted flywheels. This means that flywheels & dampeners shouldn't be swapped between the 6.9 & 7.3, and would also mean that the factory turbo dampeners & flywheels are differently weighted than the NA 7.3s...
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'94 F-Super Duty dump, plow, 7.3 ATS 093, E4OD, soon(?) to be 4x4
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Old 05-01-2011, 03:07 PM
Jayme Duty Jayme Duty is offline
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Will driving with this setup cause premature tranny or engine failure until i can get the right flywheel. I am really surprised this never came up with all the questions i asked during the swap.
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-01-2011, 03:19 PM
Jayme Duty Jayme Duty is offline
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Does anybody have a part number for this, everything i find is for 88-94 non turbo
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-01-2011, 03:35 PM
Jayme Duty Jayme Duty is offline
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What is the difference between F and K code trucks, both show turbo charged
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-01-2011, 03:49 PM
Jayme Duty Jayme Duty is offline
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does anybody know what the difference is between these two flywheels and if this is what i am looking for
Sachs NFW1069 - Flywheel | O'Reilly Auto Parts
Sachs NFW1067 - Flywheel | O'Reilly Auto Parts
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-01-2011, 04:16 PM
IDI Diesel IDI Diesel is offline
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I cant find to much diffeance expect the secnd link fits more applications. Could be the spring rates or tooth count. Couldnt find those specs though
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Old 05-01-2011, 04:32 PM
Lazy K Lazy K is offline
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K is `94 factory turbo, F is Power Stroke.
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Old 05-01-2011, 06:29 PM
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Jamye You have to remember tha there were 3 different versions of the 7.3 in 94. As far as I know both the NA and turboed 7.3 IDIs take the same flywheel, but the 7.3 powerstroke flywheel is different, and won't work on the IDI. Is that where the confusion is coming from?
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1985 F250 Reg. cab 6.9,94 factory turbo, zf5 speed, 3.55 4X4, flatbed, dual 3.5in. stacks
1990 F350 SRW Crewcab 7.3 turbo 4.10 zf 5spd 4X4
1997 F350 SRW Reg cab powerstroke 4.10, zf5spd 4X4, 3inch downpipe, 6637 mod, intercooler
1996 F350 Crewcab dually 4.10, E4OD, 3" downpipe, 6637 filter
1996 F350 C&C Dually reg cab 4X4 flatbed Zf5 4.10, 3" downpipe, 6637 filter
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Old 05-01-2011, 08:40 PM
Jayme Duty Jayme Duty is offline
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I do understand the three different motors for 94. However i am now learning the motors are balanced different for the factory turbo and the N/A so the flywheel has to be different. I know that my truck is K code but every flywheel i find says 88-94. ???????
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-02-2011, 12:23 AM
axel 56 axel 56 is offline
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I just bought a 7.3 idi and the guy I bought it from took the after market flywheel that was on it and put it on his 6.9 with no prob he did say something about haveing to use the aftermarket clutch and pressure plate as they are a different size than the ford one but myself I do not Know.Thats just wat was said .
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Old 05-02-2011, 08:49 AM
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NorthernDiesel NorthernDiesel is offline
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For reference, this is the origin of my question to Jayme Duty, since I'm doing this swap soon. This is from the Ford manual supplement for the 94 turbo modifications:

Click the image to open in full size.
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Old 05-02-2011, 09:43 AM
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Quote:
Originally Posted by Jayme Duty View Post
I am really surprised this never came up with all the questions i asked during the swap.
Nothing I had read before said anything about different flywheels for the factory turbo. I never really thought about it until your 1st. post in this thread, but it makes sense.
Now, how much difference it makes is a good question. I've read of people interchanging 6.9 & 7.3 flywheels with no problem, & I'd have to think that the difference in piston assy. weight is greater there than the difference between the 7.3 NA vs. Turbo.
The O'Reilly links are disapointing. Based on the engine code, they claim that both flywheels fit IDI's and Strokes... You might contact Sachs directly, with their part numbers. You might get better info there.

Good luck man!
Phy
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'94 F-Super Duty dump, plow, 7.3 ATS 093, E4OD, soon(?) to be 4x4
'93 F250 4x4 460
'93 F350 4x4 dump, 7.3 ATS 093, E4OD- parts truck
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Old 05-02-2011, 10:17 AM
Jayme Duty Jayme Duty is offline
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Thanks for all the tips, i will contact ford and sachs today to see what i cant find out. is there anyother parts you guys would change out while i have the tranny out again. the clutch is almost new (10,000miles) so am not worried about it.
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1994 f-250 4X4 ext. cab long bed factory turbo, now sporting zf5. straight pipe, ram air, triple pillar gauges. 2in lift, 315-75-16 fierce tires, 16x8 american racing wheels. JL speakers and sub power by rockford amps. Lund moon visor, deep tool box. Headache rack in progress
1991 f-250 is now a trailer
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Old 05-02-2011, 10:22 AM
farmert farmert is offline
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Northern, Good info, that is the first that I heard of that, but it makes sense. You learn something new every day.
I agree with Phy on the Orilley's links, if you do a search for a 96 flywheel you come up with a different number than what they say a 94 stroke takes, but they should be the same.
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1985 F250 Reg. cab 6.9,94 factory turbo, zf5 speed, 3.55 4X4, flatbed, dual 3.5in. stacks
1990 F350 SRW Crewcab 7.3 turbo 4.10 zf 5spd 4X4
1997 F350 SRW Reg cab powerstroke 4.10, zf5spd 4X4, 3inch downpipe, 6637 mod, intercooler
1996 F350 Crewcab dually 4.10, E4OD, 3" downpipe, 6637 filter
1996 F350 C&C Dually reg cab 4X4 flatbed Zf5 4.10, 3" downpipe, 6637 filter
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Old 05-02-2011, 10:22 AM
 
 
 
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