Author Topic: Lightening and balancing the intermediate shaft. (Read 25803 times)

stewardc · « **Reply #30 on:** April 21, 2008, 06:43:58 am »

When I did mine, I talked to the builder about the shaft. He builds mega-horsepower race engines every day. His feelings were to put it in a lathe and cut off the lobe and clean off the casting marks (reduces stress points) and install it with new bearings.

rabbid79 · « **Reply #31 on:** April 21, 2008, 07:05:26 pm »

Subsonic, who did you originally talk to that does several of these each week? I'd like to send mine to someone who has done a few before. Thanks.

subsonic · « **Reply #32 on:** April 21, 2008, 07:30:53 pm »

There are a few links to people who do it on the first page. Any machine shop should be able to.

subsonic · « **Reply #33 on:** June 10, 2008, 08:22:41 pm »

Went by the shop today to drop off some bolts. Sitting on a shelf was my IM shaft, all turned and polished.

I did not have my camera with me, but I will snap some pics for sure before it goes back in. My bud said that when he spun it in his lathe he was shocked. The ends spun mostly true, but the middle, in his professional opinion:
"Looked like a nasty tree branch spinning around."
"It was god awful."
"It was completly unbalanced and vibrating like a mother ***er."

He said that after he finished turning it down, and polishing it with emory cloth the vibrations were gone and it spun nice and true.

Niiice

Pictures of my shaft to follow :wink: :lol:

captainpartytime · « **Reply #34 on:** June 12, 2008, 07:41:11 pm »

Quote from: "subsonic"

Perhaps there is another member who has one out of the car.

I have mine out of my 1.6 ECOdiesel. I will weigh it tomorrow. I'm considering having it turned down.

theman53 · « **Reply #35 on:** June 12, 2008, 08:13:55 pm »

I won't post a pic of my shaft but since it isn't turned down then my shaft should be bigger than yours and still vibrating like a MF :wink: :lol:

subsonic · « **Reply #36 on:** June 12, 2008, 08:34:11 pm »

Quote from: "theman53"

I won't post a pic of my shaft but since it isn't turned down then my shaft should be bigger than yours and still vibrating like a MF :wink: :lol:

True, but mine has more miles of use on it:lol: :lol:

Quote from: "captainpartytime"

Quote from: "subsonic"
Perhaps there is another member who has one out of the car.

I have mine out of my 1.6 ECOdiesel. I will weigh it tomorrow. I'm considering having it turned down.

That would be really cool. I was told there was a substantial pile of metal after it was done being turned. I am guesssing it is between 1-4 onces lighter.

jtanguay · « **Reply #37 on:** June 12, 2008, 10:41:12 pm »

this is very interesting... the IM shaft is quite large... and it seems as though it doesn't really need to be that big. does oil pressure and vacuum pump make THAT much stress???

while i can still take mine out, maybe i'll see about having it turned :wink:

thanks!

rabbitman · « **Reply #38 on:** June 13, 2008, 07:48:35 pm »

When I got my rabbit out of the junkyard the IM was broken off were the pulley goes. No clue why.

Baxter · « **Reply #39 on:** June 14, 2008, 03:04:13 pm »

This thread is great, just loaded with inuendo!

For any UK readers of Viz magazine... Finbar saunders would have a field day here!.

:lol:

For US readers..

subsonic · « **Reply #40 on:** June 14, 2008, 07:43:25 pm »

Quote from: "jtanguay"

this is very interesting... the IM shaft is quite large... and it seems as though it doesn't really need to be that big.

While i can still take mine out, maybe i'll see about having it turned :wink:

thanks!

Bigger is normally better, but having a light shaft that you can use at high speed definitely has it's advantages if you want to get the motor revving and warmed up fast. :lol:

captainpartytime · « **Reply #41 on:** June 14, 2008, 09:03:50 pm »

All we need now is a well placed "that's what she said"

I just weighed my IM shaft.
3.2 lbs. +/- .1
1452 grams or 1.452 kg

I live very close to SCCH http://scch-heads.com/viewpart.php?id=23 so I think I may pay them a visit to see if they can true and lighten diesel IM shafts.

subsonic · « **Reply #42 on:** June 15, 2008, 05:48:29 am »

Quote from: "captainpartytime"

I just weighed my IM shaft.
3.2 lbs. +/- .1
1452 grams or 1.452 kg

Nice work. Is that weight for just the shaft, or does it include the bolt and washer? I am going to make a guess and say that there will be some deviations between shafts due the rough casting quality of the center section, but this is a great start. I should be able to get pictures tommorow. I will also measure the new OD of the shaft.

What did yo use to weigh it?

captainpartytime · « **Reply #43 on:** June 15, 2008, 07:30:02 am »

I weighed it without the bolt and washer. I used my wife's digital scale which reads to the tenth of a pound. I weighed myself and then myself + IM shaft 4 separate times then took the average. I will verify the IM shaft's weight with a digital balance I use at work.

subsonic · « **Reply #44 on:** June 15, 2008, 06:35:13 pm »

I was hoping to use my high speed digital reloading scale to measure the weight, but I just checked and it's only good up to 100 grams / 3.527 ounces. Accurate to a 10th of a grain, but not able to weigh the shaft. Going to have to find somthing else accurate to use.

Author Topic: Lightening and balancing the intermediate shaft. (Read 25803 times)

stewardc

Baxter