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Drilling thrust? #2734792
01/20/20 09:58 AM
01/20/20 09:58 AM
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Milwaukee WI
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TRENDZ Offline OP
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Anybody ever drill a small oiling hole through the saddle and bearing on the thrust to keep wear down on a heavy clutch equipped combo? Thinking of doing this, as I’ve read about thrust problems with early hemi/ clutch combos. This particular engine has (more) modern 340 main bearings.
All thoughts and opinions appreciated.


"use it 'till it breaks, replace as needed"
Re: Drilling thrust? [Re: TRENDZ] #2734811
01/20/20 10:28 AM
01/20/20 10:28 AM
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On the parachute mount
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n20mstr Offline
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I never did this, but recently saw it on a youtube video. A turbo car and they are low budget. SO instead of the roller bearing machined in the front of the crank, they drill through the bearing to the passage. I thought it was a great idea to direct oil the face of the thrust bearing. they didn't say what size drill but I would think if you went too large, you could always drill the hole in the bearing smaller??

interesting idea


....BAD A$$ STREET CAR.....
Re: Drilling thrust? [Re: TRENDZ] #2734855
01/20/20 12:14 PM
01/20/20 12:14 PM
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Sonora CA
Mopar_Rich Offline
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I have done this many times when I was building big HEMIs. I also chamfered the thrust edge where the two shells meet in order to help spread the extra oil. It always seemed to work fine.

Re: Drilling thrust? [Re: TRENDZ] #2734868
01/20/20 12:35 PM
01/20/20 12:35 PM
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Originally Posted by TRENDZ
Anybody ever drill a small oiling hole through the saddle and bearing on the thrust to keep wear down on a heavy clutch equipped combo? Thinking of doing this, as I’ve read about thrust problems with early hemi/ clutch combos. This particular engine has (more) modern 340 main bearings.
All thoughts and opinions appreciated.




Why are you running a "heavy" clutch? I can't think of any reason to run something like that. Just curious.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Drilling thrust? [Re: madscientist] #2734876
01/20/20 01:01 PM
01/20/20 01:01 PM
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Kirkland, Washington
Pacnorthcuda Offline
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I disconnect the Clutch safety starter switch and make sure I DONT depress the clutch on starts. In my mind that’s plenty of precaution to ensure little to no thrust bearing wear.

Re: Drilling thrust? [Re: madscientist] #2734894
01/20/20 01:46 PM
01/20/20 01:46 PM
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Milwaukee WI
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TRENDZ Offline OP
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Originally Posted by madscientist
Originally Posted by TRENDZ
Anybody ever drill a small oiling hole through the saddle and bearing on the thrust to keep wear down on a heavy clutch equipped combo? Thinking of doing this, as I’ve read about thrust problems with early hemi/ clutch combos. This particular engine has (more) modern 340 main bearings.
All thoughts and opinions appreciated.




Why are you running a "heavy" clutch? I can't think of any reason to run something like that. Just curious.


Im not actually. I am running a high rpm launch program though, so i would imagine this would make the thrust happier. Just extrapolating off of the things I have read about heavy (meaning release pressure) clutches.
Mine will have a MCLEOD or RAM slipper.


"use it 'till it breaks, replace as needed"
Re: Drilling thrust? [Re: Mopar_Rich] #2734910
01/20/20 02:14 PM
01/20/20 02:14 PM
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Posts: 4,662
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n20mstr Offline
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Originally Posted by Mopar_Rich
I have done this many times when I was building big HEMIs. I also chamfered the thrust edge where the two shells meet in order to help spread the extra oil. It always seemed to work fine.


WHAT SIZE WAS THE HOLE DRILLED? AND SAME SIZE HOLE IN THE THRUST BEARING?


....BAD A$$ STREET CAR.....
Re: Drilling thrust? [Re: n20mstr] #2734952
01/20/20 03:37 PM
01/20/20 03:37 PM
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Auburn WA
Dave_J Offline
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Wrong post.

Last edited by Dave_J; 01/21/20 12:34 AM.

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Re: Drilling thrust? [Re: Dave_J] #2735001
01/20/20 05:19 PM
01/20/20 05:19 PM
Joined: Feb 2006
Posts: 604
TN
1DGEMAN Offline
mopar
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TN
Been doing this since the 70's on NHRA Stock eliminator small blocks.


Real Men shift for themselves
Re: Drilling thrust? [Re: TRENDZ] #2735058
01/20/20 08:13 PM
01/20/20 08:13 PM
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Posts: 1,048
The Great White North
RAMM Offline
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The Great White North
I do this on most Big and Small Mopars as well as Fords or anything with the thrust bearing on the number 3 main. It really helps especially with a manual trans application. I'm a believer. J.Rob


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Re: Drilling thrust? [Re: TRENDZ] #2735080
01/20/20 10:11 PM
01/20/20 10:11 PM
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Posts: 4,457
Washington
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madscientist Offline
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Originally Posted by TRENDZ
Originally Posted by madscientist
Originally Posted by TRENDZ
Anybody ever drill a small oiling hole through the saddle and bearing on the thrust to keep wear down on a heavy clutch equipped combo? Thinking of doing this, as I’ve read about thrust problems with early hemi/ clutch combos. This particular engine has (more) modern 340 main bearings.
All thoughts and opinions appreciated.




Why are you running a "heavy" clutch? I can't think of any reason to run something like that. Just curious.


Im not actually. I am running a high rpm launch program though, so i would imagine this would make the thrust happier. Just extrapolating off of the things I have read about heavy (meaning release pressure) clutches.
Mine will have a MCLEOD or RAM slipper.



Ok. A sintered iron set up is not what I'd call a heavy clutch. I have never drilled one, but there is nothing wrong with it. In fact, I probably should do it but since I've never had an issue (yet...knock on wood...probably screwed myself by saying that) I have never done it.

I can say it's a very good idea.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston






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