96 5.8L flywheel question
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From: Rusty, Maine
96 5.8L flywheel question
I'm taking a 96' 5.8 engine (out of an auto truck) and swaping it into my F-150 (now a 4.9) and I'm going to keep the M5OD for now.
Question is will the 4.9 flywheel detonate the 5.8 from imbalance? Or will it be fine? I know they will interchange but I don't want a broken crank in a week after the swap. So I figured this was the place to ask.
Any input would be great.
Question is will the 4.9 flywheel detonate the 5.8 from imbalance? Or will it be fine? I know they will interchange but I don't want a broken crank in a week after the swap. So I figured this was the place to ask.
Any input would be great.
Cargo Master
Joined: May 2007
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From: British Columbia
There's no reason that this swap will cause detonation. That is caused by overly advanced ignition timing or too high compression ratio for gasoline used.
It will most likely cause rapid engine damage due to severe imbalance. The 5.8 uses a 28 oz in balance weight in the flywheel or flexplate, whereas the 4.9 uses a zero balance flywheel.
It will most likely cause rapid engine damage due to severe imbalance. The 5.8 uses a 28 oz in balance weight in the flywheel or flexplate, whereas the 4.9 uses a zero balance flywheel.
Cargo Master
Joined: May 2007
Posts: 2,071
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From: British Columbia
Flywheels
I'm glad I was helpful with your question. Also beware of 302/5.0 flywheels as late model ones (after 1982 or so) are 50 oz-in unbalance so also will result in bad vibrations. Early ones are 28 oz-in.
This is an interesting subject because in flywheel tables the six cylinder units are often left out, which is a bit strange since they are common in trucks and are interchangeable with the small V8 counterparts, other than the imbalance.
Something to keep in mind when considering balancing is that besides the cast in counterweights, the flexplates and flywheels come from the factory with numerous shallow holes drilled in them to fine tune the balance (or little welded on tabs in the case of flexplates). So even the cost conscious OEM thinks that fine balancing is important.
This is an interesting subject because in flywheel tables the six cylinder units are often left out, which is a bit strange since they are common in trucks and are interchangeable with the small V8 counterparts, other than the imbalance.
Something to keep in mind when considering balancing is that besides the cast in counterweights, the flexplates and flywheels come from the factory with numerous shallow holes drilled in them to fine tune the balance (or little welded on tabs in the case of flexplates). So even the cost conscious OEM thinks that fine balancing is important.
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From: Rusty, Maine
Ok well. I guess I'm going to buy a salvage yard one and make sure they don't pass me a 5.0 flywheel and say "awe it's all the same 5.0 and 5.8".
As far as a clutch I'll have to use the 5.8 flywheel and pressure plate and toss my little 4.9 clutch disc because i'm sure the ZF and the M5OD don't use the same transmission main shaft.
As far as a clutch I'll have to use the 5.8 flywheel and pressure plate and toss my little 4.9 clutch disc because i'm sure the ZF and the M5OD don't use the same transmission main shaft.
Cargo Master
Joined: May 2007
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From: British Columbia
With luck the junkyard flywheel will have a decent clutch disc and pressure plate on it, they usually don't charge extra for those items when you buy the big piece.
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So your saying that the ZF and the M5OD have the same input shaft spline and diameter? Meaning that I could take a 351/ZF clutch kit and my M5OD input shaft would fit in it ok?
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Well I'll probably detonate my M5OD after bolting a very mildly built 351 to it.
Lead Driver
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From: Concord, NC
So your saying that the ZF and the M5OD have the same input shaft spline and diameter? Meaning that I could take a 351/ZF clutch kit and my M5OD input shaft would fit in it ok?
