I have to change lathe bearings, so hopefully in a couple hrs. I will start the idle test at 420rpms. Not sure if I should count the mileage? As at idle the car is usually at rest. I will do the idle test for a week (7days) since idle is the worst for the bearing apparently... I will take an oil sample tonight and after the idle test is finished to see if anything metalic in the oil is visible under the microscope. I can't do a ppm, but I will definately be able to see a change between the 2 samples compared to the start sample.
So we have....,
12,504 mi. +3,666 mi.=16,170mi. while not a milestone, but its a start.

Ok, up and running... 10pm pst. @ 420 rpms, oil still looks like new. Will look and compare to the start oil sample.
as for the lathe... if you have one of the HF, central machinery 9x20 the bearings are taper rollers 32007 2ea. for the chuck shaft.

9.5 hrs 250F/ 220F... when I did the oil sample, a quick test test by feel, the bearing still felt like new. The seal didn't show any signs of wear? After this week at idle, I think its back up to atleast 3000 rpm shaft/6000rpm engine to put some distance on the seal.

looking good so far Feelyx,how many miles do you plan to go on the first no load test? sending some engine parts out early next week,did you want the IMS shaft with the bearing seals.

I am hoping for 200,000 + I am also trying to incorperate your idea with a pressure load on the shaft, but I am trying not to make this a bearing issue as there are plenty of good bearings out there. If I do I am going with a roller bearing as I see no testing of a roller.
Yes, I will take the shaft, PM me your paypal address and send some money to you.
Thanks
Tim

I have a mod I am working on that will eliminate the need for a spacer to pin the smaller race of the bearing. The seal has a metal ring that pins the top, so a simple cut will remove the need for any spacers on the '97-'99. It says 25mm dia. seal but I think a 23mm or even a 22mm dia. seal would suit this best.

http://forums.pelicanparts.com/uploa...1332478236.jpg
(the pic I modified was stolen off Pelican.....,,, don't tell Wayne) SmileWavy


PS.... still running no problems... not even with the lathe LOL!

quick update, still running quiet and no problems, I will have to get a couple more heat guns, just in case.
2nd update, yep, still smooth, quiet, and no problems. Sat. 3:15pm pst.

I am looking at the IMS and how stout is is built. It seems as I play with this, the flex is happening in the inner race of the bearing, and case halves. As Howe00 had stated before, a self-aligning spherical bearing would be the best for this situation.
Now, to figure how much pull at idle and full speed the chains have on the tube.
If, someone has a wobbly center double row, and is willing to send me, I would like to inspect it. Thanks.

Ok, I am a little confused here, I was reviewing the IMS bearing install that Wayne has written up on his site here, and my question is.... did Porsche ever go to a gear drive on the IMS shaft? Look at the 2 photos from the write up, and let me know.... SmileWavy
(Photos are not mine.... but on the website here)

http://forums.pelicanparts.com/uploa...1332633352.jpg

http://forums.pelicanparts.com/uploa...1332633371.jpg

edit: maybe they went to laminated chain by the wear marks on the gear??? ie. early chevy v8 style.....

I think GM did that on the cam gear for noise? over time and heat they broke off the sprockets. thanks Tim, chains are in the box (free) for your IMS testing ,good luck.

Thanks, Greg
If I remember right those chains would stretch like crazy also.... cam deviation issues?

Cross section one. They aren't well built. I have pictures on our website of one we sliced in half. We get them in the shop all the day with up to 1/8" runout on the sprocket and have to straighten and pin them to be usable. There also is a bushing in the i.d. of the tube that keeps the sprockets from crushing the thinwall pipe and they fall out of place, causing the sprockets to move. We're going to be making out own, time permitting, since we see higher and higher demand for them and there are basically zero cores left around.

Thanks for the info Charles, glad to see you following this thread. I have a few questions....
The ones you get in the shop, are they new? or did they suffer from a bearing failure?
Have you cut a double bearing shaft? As that is what I am focused on, the early double bearing. The shaft I am running is nearly perfect from one end to the other.

I can see where the center bushing would/could move if too much heat was applied to this area, allowing the gears to move and seperate and pinning would help.
I have had the temp as high as 300F on my test and I am now wondering if the oil in the tube is keeping the IMS cool enough so the gears don't seperate?

I look foreward to seeing your IMS you intend to produce, I have no doubt that it will be impressive.

update, nothing exciting, still running smooth and quiet, sun 12pm pst.

feelyx, Please don't take this as a knock. But IMHO. Until you put a load on that shaft/bearing. You're waisting electricity running that lathe and not proving much. I would be curious how ever to see when you reach your goal of 200k miles, as is. Then put a load on it and see what happens. Best of luck and thanks for the informative thread!

Randy

Hi randy, No problem, if you need to knock then knock away. I do agree that this is pretty much useless if it was a bearing test. But, I am just peeling layers off the seal to see if it can go the distance of 200k +, withstand the heat of 250F+, at what point does the seal get hard, cracked, rippled, can it handle the speed of the shaft, etc.

I have been looking at the case halves and bearings where the flex would take place, I have placed a 5000lb. ratchet strap around the shaft inside the case where the chains would pull on the shaft, and the flex is always inside the bearings inner race, and I can even get the case itself to flex. I can't imagine that the chains would put that amount of pressure on the bearing, just to get <5 degrees of angle to the inner race.

I would like find a wobblely double bearing to see if I can find the angle of which the chain actually pulled on it.

The next test..., will have a load on it with the fail angle built in. I will be mounting 2 IMshafts with the bearings back to back on an adjustable plate that can be raised/lowered. That way I can force the angle to the inner race on 2 different bearings. Hhhhmmmmm.... which 2 bearings should I test first.... ;)

Onward... SmileWavy

Thanks for understanding. My thoughts are just observations. And no more. Not a bearing scientist, or engineer. Don't put this in the same ballpark as what the IMS bearing does. But coming from the R/C world. A R/C engine will run all day with no problems with no load. Put an out of balance prop on it and it's a whole nother animal.
I'll be watching with great interest. Like I said. Best of luck.
Randy

Thanks randy, at least someone is watching :) I know this part of the test is kinda boring, but it must be done.

It'll only be boring for another page. Then something will happen. LOL Kidding. I find it all interesting. Looking forward to the next update. Hang in there. SmileWavy

Randy

yep, running like a champ, 1.5 more days and back to high speed run...