Early/late NA flywheel difference?
08-14-2011, 10:33 PM
#1
Rainman
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Early/late NA flywheel difference?
Just curious if anyone could enlighten me on something. Search was inconclusive.
Apparently the early cars have a different flywheel than late cars. They are different part numbers and people caution to only use the appropriate wheel on your model year engine.
However, the clutch disk and pressure plate are the same for all 2.5 NA 8v 82-89. The crank is also the same on the flywheel end. The bellhousings are the same. The reference and speed sensors are the same, and the ring gears are the same.
So what's the difference?
Apparently the early cars have a different flywheel than late cars. They are different part numbers and people caution to only use the appropriate wheel on your model year engine.
However, the clutch disk and pressure plate are the same for all 2.5 NA 8v 82-89. The crank is also the same on the flywheel end. The bellhousings are the same. The reference and speed sensors are the same, and the ring gears are the same.
So what's the difference?
08-14-2011, 10:49 PM
#3
Race Director
Late flywheels have an extra plug for a test sensor. So Instead of 1 set screw on the flywheel there are two. Unless you are trying to hook up some fancy factory diagnostics it makes no difference. I have run both on my 944 spec.
08-15-2011, 10:05 AM
#6
Race Director
Hey I only know because I was in the middle of engine rebuilt and noticed both flywheels in my hands. I thnk I put on motor as wonder which one was right. Looked at the sensors, and bell housing and saw the late bell housing had place for test sensor. Currently I have an 88 block and 88/87 electrics in my 84. Not sure what flywheel is in the car, but I know for a time at least I ran a single plug flywheel with late electrics. Never an issue.
You learn a few things work with these cars for 11 years now. It was the summer of 2000 when I started building my 84 944 track car from bits of the 84 and low mileage wrecked 87 924S parts car. Not much on the car I have not touched and not much I have not tried to swap over. Being cheap I have to make use of everything I can and reuse where ever possible.
Glad I could help out.
You learn a few things work with these cars for 11 years now. It was the summer of 2000 when I started building my 84 944 track car from bits of the 84 and low mileage wrecked 87 924S parts car. Not much on the car I have not touched and not much I have not tried to swap over. Being cheap I have to make use of everything I can and reuse where ever possible.
Glad I could help out.
03-29-2012, 10:34 AM
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Ok here is a question for you. I bought a used flywheel off Ebay. Its supposed to fit 84 to 89 NA. One I got it I sanded off all the rust to find the number 944102105 3R According to my research it is from a 1990 944 with 3 liter motor. But was supposidly removed from a 1985 NA. Do you think this flywheel will work with my 84 NA ?
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03-29-2012, 03:43 PM
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Ok here is a question for you. I bought a used flywheel off Ebay. Its supposed to fit 84 to 89 NA. One I got it I sanded off all the rust to find the number 944102105 3R According to my research it is from a 1990 944 with 3 liter motor. But was supposidly removed from a 1985 NA. Do you think this flywheel will work with my 84 NA ?
Without checking PET, if the flywheel has cast in teeth then its a 16v part (I'm not talking about the starter ring gear BTW). 8V flywheels do not have these teeth. The only other "gotcha" is the friction surface depth - 8v N/A models have a recessed friction area whilst the turbo version has its friction surface pretty much flush with the outer edge of the casting.
Other important points ( to save burnt fingers) You cannot use a turbo flywheel/clutch pack on an 8v engine. The ring gear has 132 teeth not 130 for starters...
I don't even bother to check the part number anymore, its either 16v, turbo or n/a 8v really. Each is easilly identifiable by appearance alone.
03-29-2012, 03:55 PM
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Turbo models are M44/51 or M44/52
S2 - M44/41
S - M44/40
The engine number was relocated to the exhaust side left hand corner. I think from 88' onwards. Just remember that auto models got there own number...
03-29-2012, 03:59 PM
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Ok here is a question for you. I bought a used flywheel off Ebay. Its supposed to fit 84 to 89 NA. One I got it I sanded off all the rust to find the number 944102105 3R According to my research it is from a 1990 944 with 3 liter motor. But was supposidly removed from a 1985 NA. Do you think this flywheel will work with my 84 NA ?
Without checking PET, if the flywheel has cast in teeth then its a 16v part (I'm not talking about the starter ring gear BTW). 8V flywheels do not have these teeth. The only other "gotcha" is the friction surface depth - 8v N/A models have a recessed friction area whilst the turbo version has its friction surface pretty much flush with the outer edge of the casting.
Other important points ( to save burnt fingers) You cannot use a turbo flywheel/clutch pack on an 8v engine. The ring gear has 132 teeth not 130 for starters...
I don't even bother to check the part number anymore, its either 16v, turbo or n/a 8v really. Each is easilly identifiable by appearance alone.
03-29-2012, 08:12 PM
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This one has no cast in teeth and Im getting a NA ring gear to go on it. This one has a recessed friction surface area and then the machined surface that the pressure plate bolts to. Sounds like by what you are saying that this flywheel will work on my 84 na correct?
