Flywheel resurfacing
#1
Pro
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Join Date: Oct 2009
Location: Redmond, Oregon
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Flywheel resurfacing
How much should i/can i?
BTW here are wonderful pictures of my horrible clutch and the bearing that was eating itself to pieces. (so THATS what that bbs in a can rattling sound was.)
BTW here are wonderful pictures of my horrible clutch and the bearing that was eating itself to pieces. (so THATS what that bbs in a can rattling sound was.)
#3
Rennlist Member
I took my 951 flywheel to a local machine shop which I trust, and they just resurfaced the front side and then shaved the backside down to basically where those little reference screws are. I think it took about 5lbs or less out from the flywheel. Not a huge difference but it was very slightly noticeable. Took about a whole day on the machine to get it shaved down.
#4
Proprietoristicly Refined
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Great disc you got there---Italian, nice.
I'm using the same disc on the '87. It took a while to break in. Now it is real smooth.
Your flywheel is nasty. A basic 2 step flywheel resurface is about $40 in PHX. I do not know what it would cost to shave weight. I have seen some ready to go on eBay for about $200 for a lightened flywheel.
GL
John
I'm using the same disc on the '87. It took a while to break in. Now it is real smooth.
Your flywheel is nasty. A basic 2 step flywheel resurface is about $40 in PHX. I do not know what it would cost to shave weight. I have seen some ready to go on eBay for about $200 for a lightened flywheel.
GL
John
#5
Rennlist Member
Are those grooves cut in the flywheel face by rivets? From the looks of the checking and scoring you may want to consider a good used flywheel, offered by several shops online. The FSM gives no guidance whatsoever on how much can be cut. If it needs more than 0.010 - 0.015" to clean up, I'd bag it.
#6
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Great disc you got there---Italian, nice.
I'm using the same disc on the '87. It took a while to break in. Now it is real smooth.
Your flywheel is nasty. A basic 2 step flywheel resurface is about $40 in PHX. I do not know what it would cost to shave weight. I have seen some ready to go on eBay for about $200 for a lightened flywheel.
GL
John
I'm using the same disc on the '87. It took a while to break in. Now it is real smooth.
Your flywheel is nasty. A basic 2 step flywheel resurface is about $40 in PHX. I do not know what it would cost to shave weight. I have seen some ready to go on eBay for about $200 for a lightened flywheel.
GL
John
I took my 951 flywheel to a local machine shop which I trust, and they just resurfaced the front side and then shaved the backside down to basically where those little reference screws are. I think it took about 5lbs or less out from the flywheel. Not a huge difference but it was very slightly noticeable. Took about a whole day on the machine to get it shaved down.
Are those grooves cut in the flywheel face by rivets? From the looks of the checking and scoring you may want to consider a good used flywheel, offered by several shops online. The FSM gives no guidance whatsoever on how much can be cut. If it needs more than 0.010 - 0.015" to clean up, I'd bag it.
#7
Nordschleife Master
Definitely resurface the flywheel, this should always be done when replacing the disc. Cost should not be more than $50 or so and takes about a day. Lightening is a nice option also if you want to do it, you can get the stock flywheel down to about 9lbs or so. It revs much nicer and is not bad at all in traffic or starting on inclines. A well worthwhile thing to do i think.
Its also a very good idea to have the flywheel and pressure plate assembly balanced.
I had a machine shop resurface, lighten and balance the flywheel/PP together.. cost was $120 and was ready for me at the end of the day.
This is what the disc looks like after lightening, you can see where the material on the backside is removed.
Its also a very good idea to have the flywheel and pressure plate assembly balanced.
I had a machine shop resurface, lighten and balance the flywheel/PP together.. cost was $120 and was ready for me at the end of the day.
This is what the disc looks like after lightening, you can see where the material on the backside is removed.
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#8
Rennlist Member
Jon, do you know by any chance what the weight difference is for a stock 944 n/a flywheel vs. a stock 951 flywheel, if any? I can't seem to remember what I weighed mine at, but I figure someone has factory specs.
:/
:/
#9
No, not Mosquito!
Rennlist Member
Rennlist Member
Wow, I just had my flywheel resurfaced locally... but had no clue about the lightening. Now I'm wondering if I should bring it back... hm....
#11
Proprietoristicly Refined
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+1 + on the information from Techno Duck.
If you got the complete clutch kit (PP,TO,disc) you should get the PP & FW balanced. I did this on my "87 when I installed the Italian disc. $125.
After the FW is ground and the top ridge is put on the lathe, the shop will put the FW on the machine and balance it separately. then the PP is attached and balanced as a pair.
The only possible downside to get it balanced is that you pay so close attention to vibration that you may notice the Torque Tube/driveshaft vibration if the TT bearings are out of tolerance--going bad.
The FW weighs about 15 pounds 4 ounces.
GL
John
If you got the complete clutch kit (PP,TO,disc) you should get the PP & FW balanced. I did this on my "87 when I installed the Italian disc. $125.
After the FW is ground and the top ridge is put on the lathe, the shop will put the FW on the machine and balance it separately. then the PP is attached and balanced as a pair.
The only possible downside to get it balanced is that you pay so close attention to vibration that you may notice the Torque Tube/driveshaft vibration if the TT bearings are out of tolerance--going bad.
The FW weighs about 15 pounds 4 ounces.
GL
John