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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: rickseeman]
#3223667
03/30/24 10:02 AM
03/30/24 10:02 AM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,678
Stuttgart, Arkansas
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I don't think we are supposed to think about eccentricity. I don't believe we know anything about that nor is it something we can change. I think our job is to make sure the hole is the right size (2.9425"-2.943") and that we have the proper bearing to crankshaft clearance in the vertical dimension.
2011 Drag Pak Challenger
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: Cab_Burge]
#3223713
03/30/24 01:50 PM
03/30/24 01:50 PM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 761
Southington Ct.
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On the 119M mains I'm seeing about .002" eccentricity and consistent from hole to hole and the housing bores are perfect so I know its in the bearings. AG.
Last edited by turbobitt; 03/30/24 01:51 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: rickseeman]
#3223743
03/30/24 03:55 PM
03/30/24 03:55 PM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 761
Southington Ct.
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Is that a bad thing? What is your vertical clearance? I don't have a crank to calculate actual clearance but If I get a crank at nominal diameter than clearance will be .0025-.003( .003 on the center thrust main) . If I base it on the last K1 crank I had(main journals were slightly below min spec) than my clearance will be .0035-.004 (.004 on the center thrust main). I had a set of full groove Clevite 877P bearings and mounted one in the #1 main to spot check and was pretty much the same. AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: AndyF]
#3227177
04/15/24 12:20 PM
04/15/24 12:20 PM
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Joined: Aug 2003
Posts: 1,314 Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,314
Charlotte, NC
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Bearings can be hard to find these days so you should feel lucky that you have a couple of sets to pick from. I've noticed the same thing, any idea why?
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: turbobitt]
#3227189
04/15/24 12:48 PM
04/15/24 12:48 PM
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Joined: Dec 2006
Posts: 2,118 Byron, NY
W.I.N. Racing
top fuel
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top fuel
Joined: Dec 2006
Posts: 2,118
Byron, NY
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Is that a bad thing? What is your vertical clearance? I don't have a crank to calculate actual clearance but If I get a crank at nominal diameter than clearance will be .0025-.003( .003 on the center thrust main) . If I base it on the last K1 crank I had(main journals were slightly below min spec) than my clearance will be .0035-.004 (.004 on the center thrust main). I had a set of full groove Clevite 877P bearings and mounted one in the #1 main to spot check and was pretty much the same. AG. Taken from the Cleveite bearing catalogue “The wall is thickest at 90 degrees from the split and drops off a prescribed amount toward each parting line, depending on the bearings intended application. This drop off is called “Eccentricity.” In addition, there is a relief at the parting lines. Eccentricity is used to tailor the bearing shell to its mating hardware and to provide for hardware deflections in operation. Eccentricity also helps to promote oil film formation by providing a wedge shape in the clearance space. The relief at each parting line insures that there will not be a step at the split line due to bearing cap shift or the mating of bearing shells that differ slightly in thickness within allowed tolerance limits”Its a good read if you want to know bearing specifics..
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: W.I.N. Racing]
#3227209
04/15/24 01:57 PM
04/15/24 01:57 PM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 761
Southington Ct.
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Is that a bad thing? What is your vertical clearance? I don't have a crank to calculate actual clearance but If I get a crank at nominal diameter than clearance will be .0025-.003( .003 on the center thrust main) . If I base it on the last K1 crank I had(main journals were slightly below min spec) than my clearance will be .0035-.004 (.004 on the center thrust main). I had a set of full groove Clevite 877P bearings and mounted one in the #1 main to spot check and was pretty much the same. AG. Taken from the Cleveite bearing catalogue “The wall is thickest at 90 degrees from the split and drops off a prescribed amount toward each parting line, depending on the bearings intended application. This drop off is called “Eccentricity.” In addition, there is a relief at the parting lines. Eccentricity is used to tailor the bearing shell to its mating hardware and to provide for hardware deflections in operation. Eccentricity also helps to promote oil film formation by providing a wedge shape in the clearance space. The relief at each parting line insures that there will not be a step at the split line due to bearing cap shift or the mating of bearing shells that differ slightly in thickness within allowed tolerance limits”Its a good read if you want to know bearing specifics.. Thanks but I have already read it and well aware that there is eccentricity built in but was hoping the catalogs would have more specific informataion than just low/medium/high ecentricity.... AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Full Groove vs. 3/4 Groove Mains for BB Mopar
[Re: LSP]
#3227211
04/15/24 02:01 PM
04/15/24 02:01 PM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 761
Southington Ct.
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Bearings can be hard to find these days so you should feel lucky that you have a couple of sets to pick from. I've noticed the same thing, any idea why? The same old story, global supply chain issues..... The middle east is in turmoil and King bearings is in Jerusalem from what I understand. I was in contact with king on there +/- ,001 race main bearing sets and they tell me the production date is scheduled for 8/24. AG/
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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