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Drilling thrust?
#2734792
01/20/20 09:58 AM
01/20/20 09:58 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
OP
master
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OP
master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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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"
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Re: Drilling thrust?
[Re: TRENDZ]
#2734811
01/20/20 10:28 AM
01/20/20 10:28 AM
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Joined: Aug 2003
Posts: 4,670 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,670
On the parachute mount
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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.....
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Re: Drilling thrust?
[Re: TRENDZ]
#2734868
01/20/20 12:35 PM
01/20/20 12:35 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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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. 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
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Re: Drilling thrust?
[Re: madscientist]
#2734894
01/20/20 01:46 PM
01/20/20 01:46 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
OP
master
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OP
master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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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. 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"
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Re: Drilling thrust?
[Re: Mopar_Rich]
#2734910
01/20/20 02:14 PM
01/20/20 02:14 PM
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Joined: Aug 2003
Posts: 4,670 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,670
On the parachute mount
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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. WHAT SIZE WAS THE HOLE DRILLED? AND SAME SIZE HOLE IN THE THRUST BEARING?
....BAD A$$ STREET CAR.....
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Re: Drilling thrust?
[Re: n20mstr]
#2734952
01/20/20 03:37 PM
01/20/20 03:37 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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Wrong post.
Last edited by Dave_J; 01/21/20 12:34 AM.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Drilling thrust?
[Re: Dave_J]
#2735001
01/20/20 05:19 PM
01/20/20 05:19 PM
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Joined: Feb 2006
Posts: 604 TN
1DGEMAN
mopar
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mopar
Joined: Feb 2006
Posts: 604
TN
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Been doing this since the 70's on NHRA Stock eliminator small blocks.
Real Men shift for themselves
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Re: Drilling thrust?
[Re: TRENDZ]
#2735058
01/20/20 08:13 PM
01/20/20 08:13 PM
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Joined: Feb 2006
Posts: 1,048 The Great White North
RAMM
super stock
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super stock
Joined: Feb 2006
Posts: 1,048
The Great White North
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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
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
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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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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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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. 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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