N/A vs IDIT flywheel

[centennial60]

Wondering if anyone here has had any experience with a n/a engine that has had a turbo flywheel installed on it by mistake. How bad is the balance off? I seem to have vibration above 2500 rpm that I just thought was normal until I bought my crewcab. Its nice and smooth all the way up to governor speed.
Here's the story. When I bought my 93 F250 it had a bad engine and a new solid flywheel setup in it. I pulled the engine and installed a 7.3 out of a 1990. I installed the flywheel/clutch setup that came with the truck not knowing at the time that there were differently balanced flywheels out there. So this vibration has been bothering me for some time and I finally got a few minutes last night to pull the inspection cover off to take a look.

It appears that I have the LUK LFW128

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I went to rock auto and they show the LFW127 as the flywheel for a n/a. If you look where the cast in counter weight is they have a lot of weight drilled out of that area

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On the LFW128 that area is not drilled

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What are your thoughts and experiences? Am I thinking correctly?

thanks,
Adam

 

[crash-harris]

Subbing to this one. Got a Duralast SMF kit from Autozone (Luk) to do my conversion. There is indeed a different part number for the IDIT trucks, but even at idle, I have some vibration and under the truck I can see the clutch fork bouncing in time with it. Could also be some other BS from when I got hit.

 

[Thewespaul]

This has been covered, I have a thread from last year that compared the different flex plates and we had a discussion about mix and matching, iirc @IDIBRONCO said he has mixed them without issues.

 

[centennial60]

This has been covered, I have a thread from last year that compared the different flex plates and we had a discussion about mix and matching, iirc @IDIBRONCO said he has mixed them without issues.

I'll try to find it. Thanks

 

[ifrythings]

I put a NA flexplate on my turbo motor just to try it out and it shook like crazy at idle and never smoothed out as you revd it up.

 

[IDIBRONCO]

At the shop I used to work at, we mixed and matched parts between n/a and factory turbo. We didn't know that they were supposed to be balanced differently. I honestly only remember one that had a vibration. Were there vibrations that were small enough to not be noticed? Who can say at this point? I quit there in 2001.

 

[crash-harris]

I've heard on turbo balance flywheels doing bad things to cranks and bearings on an N/A engine.

 

[OLDBULL8]

Wondering if anyone here has had any experience with a n/a engine that has had a turbo flywheel installed on it by mistake. How bad is the balance off? I seem to have vibration above 2500 rpm that I just thought was normal until I bought my crewcab. Its nice and smooth all the way up to governor speed.
Here's the story. When I bought my 93 F250 it had a bad engine and a new solid flywheel setup in it. I pulled the engine and installed a 7.3 out of a 1990. I installed the flywheel/clutch setup that came with the truck not knowing at the time that there were differently balanced flywheels out there. So this vibration has been bothering me for some time and I finally got a few minutes last night to pull the inspection cover off to take a look.

It appears that I have the LUK LFW128

You must be registered for see images attach

I went to rock auto and they show the LFW127 as the flywheel for a n/a. If you look where the cast in counter weight is they have a lot of weight drilled out of that area

You must be registered for see images attach

On the LFW128 that area is not drilled

You must be registered for see images attach

What are your thoughts and experiences? Am I thinking correctly?

thanks,
Adam

Looking at the 127, the cast in CW, the curved side is 6 bolt holes away, on the 128, the curved side is 5 bolt holes away and the curved side is opposite from the 127.

Here is the damper pulley difference between N/A and turbo that's why the different fly wheels.

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[typ4]

I would get the correct one, it could break the crank.

 

[centennial60]

I would get the correct one, it could break the crank.

I'm thinking that will be the route I'll take just to be safe. Thanks for all the responses.

 

[IDIBRONCO]

That would be the safe route.

 

[2stroke]

Would I be correct in saying that if you had the matching damper/flywheel-flexplate you would be good to go

 

[Thewespaul]

Crankshaft is different as well

 

[2stroke]

ok with all these differences does it matter if you turbo a N/A motor and use all the original parts of that motor

 

[IDIBRONCO]

The "turbo" parts ONLY apply to an engine that originally had a factory Turbo on it. The ones with the serial numbers that start "7.3TU2U". Partswise, everything else is considered N/A.