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Bearing Clearance Aluminum Hemi #3096477
11/23/22 08:20 AM
11/23/22 08:20 AM
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Mt Morris Michigan
mopar dave Offline OP
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I was able to do a quick check on one rod and one main bearing with my limited time and found .0026 on rod and .0038 on main. I will get to it this weekend with a new anolog and a digital gauge to get as precise as i can.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3096515
11/23/22 10:28 AM
11/23/22 10:28 AM
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Western NC
440Jim Offline
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Originally Posted by mopar dave
.0026 on rod and .0038 on main. I will get to it this weekend with a new analog and a digital gauge to get as precise as i can.

I am fine with 0.0026" on the rod bearings (2.2 Chevy right?). But if you want more, you can mix HXN and HN bearings to get about 0.0031", just HXN would go loose ~0.0036"
What were the journal diameters? For example 2.1992 rod, 2.7492 main


1993 Daytona, 1973 Cuda 440, 2009 Challenger 5.7 Hemi, 2015 RAM 1500 5.7 Hemi 8-speed auto, Link to 572 B1 - Part 1
Re: Bearing Clearance Aluminum Hemi [Re: 440Jim] #3096537
11/23/22 11:33 AM
11/23/22 11:33 AM
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Mt Morris Michigan
mopar dave Offline OP
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the journal specs are 2.200x2.750. I measure 2.199x2.749. The mic checks out correct.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3096669
11/23/22 09:31 PM
11/23/22 09:31 PM
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Bend,OR USA
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Way better to have .001+ to much bearing clearances on any racing crank bearing than .00010 to little whistling work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Bearing Clearance Aluminum Hemi [Re: Cab_Burge] #3096704
11/23/22 11:54 PM
11/23/22 11:54 PM
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Mt Morris Michigan
mopar dave Offline OP
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I have a brand new anolog gauge that measures in .0001" increments with total measure of .050" and a digital i want to try this weekend.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3096748
11/24/22 08:40 AM
11/24/22 08:40 AM
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Mt Morris Michigan
mopar dave Offline OP
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i found the brochure that came with my rings. It has a chart for gap. street/high performance .0045 top, second .004-.006 bigger than top ring. Drag race .005 top, second .004-.006 bigger than top ring. min .015 oil ring. Should be able to get all bearings measured and crank bolted in tomorrow.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3096790
11/24/22 11:00 AM
11/24/22 11:00 AM
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Dayton, OH
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1980volare Offline
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I don’t have any experience but this is relevant to how much an aluminum block grows

https://youtu.be/QLdkTkv0Qos

Re: Bearing Clearance Aluminum Hemi [Re: 1980volare] #3096805
11/24/22 11:38 AM
11/24/22 11:38 AM
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Ambridge, Pa.
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rickraw Offline
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I’m not a metallurgist but, I wonder if a billet block expands more or less the a regular aluminum block.

Re: Bearing Clearance Aluminum Hemi [Re: 1980volare] #3096806
11/24/22 11:38 AM
11/24/22 11:38 AM
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Originally Posted by 1980volare
I don’t have any experience but this is relevant to how much an aluminum block grows

https://youtu.be/QLdkTkv0Qos

Interesting video up Thanks for the share.

Re: Bearing Clearance Aluminum Hemi [Re: 1980volare] #3096848
11/24/22 02:31 PM
11/24/22 02:31 PM
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Mt Morris Michigan
mopar dave Offline OP
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Good video. I like Steve Morris. Down to earth guy and a wealth of knowledge. I watch alot of his vids and learn from much of them. In this video the main cap is aluminum and i think that is the reason for all the growth. Using steel caps i wouldnt think you would get that kind of growth on an aluminum block, But that it the reason for this post, i dont know for sure.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097078
11/25/22 02:47 PM
11/25/22 02:47 PM
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Mt Morris Michigan
mopar dave Offline OP
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Just spoke with Ray Barton. He uses .0025-.003 on rods and no more than .004 on mains. All consistent info.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097152
11/25/22 09:35 PM
11/25/22 09:35 PM
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Mt Morris Michigan
mopar dave Offline OP
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I ended up using the digital gauge on the bore gauge and measured the bearing clearances double checking it with a new anolog gauge. They both gave exact same numbers.
Rod
1 .0026
2 .0026
3 .0026
4 .0026
5 .0025
6 .0026
7 .0026
8 .0026

Main
1 .0036 2 .0034 3 .0034 4 .0036 5 .0036

Last edited by mopar dave; 11/25/22 10:14 PM.
Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097271
11/26/22 12:58 PM
11/26/22 12:58 PM
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Indiana
Gabby63 Offline
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Those are very acceptable numbers , rods & mains . What digital gage did you use ? The one I have been using made a bad fall off the bench & needs replaced . Thanks Gary

Re: Bearing Clearance Aluminum Hemi [Re: Gabby63] #3097371
11/26/22 07:33 PM
11/26/22 07:33 PM
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Mt Morris Michigan
mopar dave Offline OP
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I bought a no name gauge online. All 5 indicators were very close to each other. I used the 2 I thought were the best of what I had. The analogue gauge I used was a old friend of mine that was a machinist on now no longer with use.

B10F65DB-3E4E-4BC3-B52E-1FC0596DC923.jpeg
Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097421
11/26/22 10:51 PM
11/26/22 10:51 PM
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Bend,OR USA
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A good, decent, dial bore gauge is handy.
I set mine up with a old Craftsman micrometer and recheck it after each bearing check, learning on how to rock it to get the minimum bore size is fun whistling scope shruggy
Left, right, up and then down, several times wrench up

Last edited by Cab_Burge; 11/26/22 10:51 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Bearing Clearance Aluminum Hemi [Re: Cab_Burge] #3097426
11/26/22 11:18 PM
11/26/22 11:18 PM
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Posts: 7,684
Mt Morris Michigan
mopar dave Offline OP
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I understand 100%. All i got done yesterday was the crank installed. Lots of measuring just to be sure.

Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097504
11/27/22 10:47 AM
11/27/22 10:47 AM
Joined: Jan 2003
Posts: 16,727
Western NC
440Jim Offline
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Originally Posted by mopar dave

I like the 0.0026" rod bearing clearance with 2.2" Chevy journal diameters.

Main
1 .0036 2 .0034 3 .0034 4 .0036 5 .0036
Dave,
What main bearings are you using? Part number:


1993 Daytona, 1973 Cuda 440, 2009 Challenger 5.7 Hemi, 2015 RAM 1500 5.7 Hemi 8-speed auto, Link to 572 B1 - Part 1
Re: Bearing Clearance Aluminum Hemi [Re: 440Jim] #3097568
11/27/22 02:12 PM
11/27/22 02:12 PM
Joined: Jan 2007
Posts: 7,684
Mt Morris Michigan
mopar dave Offline OP
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Pic

C06AE3E9-ADF1-43F1-9090-80EA5DBD6D29.jpeg
Re: Bearing Clearance Aluminum Hemi [Re: mopar dave] #3097717
11/28/22 09:46 AM
11/28/22 09:46 AM
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Marion, South Carolina [><]
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Originally Posted by mopar dave
I ended up using the digital gauge on the bore gauge and measured the bearing clearances double checking it with a new anolog gauge. They both gave exact same numbers.
Rod
1 .0026
2 .0026
3 .0026
4 .0026
5 .0025
6 .0026
7 .0026
8 .0026

Main
1 .0036 2 .0034 3 .0034 4 .0036 5 .0036

Good to go! up


CHIP
'70 hemicuda...8 sec street car
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed
'71 Demon 340
'73 Chrysler New Yorker
'90 Chevy 454SS Silverado
'06 GMC 2500HD LBZ Duramax...toy hauler






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