Crank Bearings full grove or 3/4 ???
#920450
02/03/11 07:52 PM
02/03/11 07:52 PM
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Joined: Aug 2003
Posts: 1,123 Seaford Delaware
JSR1485
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What do you guys use 3/4 grove or full grove? I have heard that full grove is best for oiling but they can cause the crank to grove on thrust side-bottom and it is better to use 3/4 grove to give the crank more area on the bottom side. A friend of mine told that to also order the bearing -.001 also. This I have not heard of? They do cost alot more Also anybody use King Bearings? I see they are made right hear in NJ
Last edited by dartsport73; 02/04/11 05:44 PM.
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Re: Crank Bearings what to use?
[Re: JSR1485]
#920455
02/04/11 05:45 PM
02/04/11 05:45 PM
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Joined: Aug 2003
Posts: 1,123 Seaford Delaware
JSR1485
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Anybody have any input on what bearings are best to use?
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Re: Crank Bearings what to use?
[Re: CHAPPER]
#920458
02/04/11 09:42 PM
02/04/11 09:42 PM
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Joined: Oct 2005
Posts: 8,911 Ontario, Canada
Stanton
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Ontario, Canada
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Ixnay on the full groove !!
From Clevite ...
First, it’s essential to understand that bearings depend on a film of oil to keep them separated from the shaft surface. This oil film is developed by shaft rotation. As the shaft rotates it pulls oil into the loaded area of the bearing and rides up on this film much like a tire hydroplaning on wet pavement. Grooving in a bearing acts like tread in a tire to break up the oil film. While you want your tires to grip the road, you don’t want your bearings to grip the shaft. The primary reason for having any grooving in a main bearing is to provide oil to the connecting rods. Without rod bearings to feed, a simple oil hole would be sufficient to lubricate a main bearing. Many early engines used full grooved bearings and some even used multiple grooves. As engine and bearing technology developed, bearing grooving was removed from modern lower main bearings. The result is in a thicker film of oil for the shaft to ride on. This provides a greater safety margin and improved bearing life. Upper main shells, which see lower loads than the lowers, have retained a groove to supply the connecting rods with oil. In an effort to develop the best possible main bearing designs for performance engines, we’ve investigated the effects of main bearing grooving on bearing performance. The graphs on the next page illustrate that a simple 180° groove in the upper main shell is still the best overall design. While a slightly shorter groove of 140° provides a marginal gain, most of the benefit is to the upper shell, which doesn’t need improvement. On the other hand, extending the groove into the lower half, even as little as 20° at each parting line (220° in total), takes away from upper bearing performance without providing any benefit to the lower half. It’s also interesting to note that as groove length increases so do Horsepower Loss and Peak Oil Film Pressure which is transmitted directly to the bearing.
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Re: Crank Bearings what to use?
[Re: Stanton]
#920459
02/04/11 09:48 PM
02/04/11 09:48 PM
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Joined: Nov 2009
Posts: 3,410 Belpre,Ohio
CHAPPER
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Belpre,Ohio
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Quote:
Ixnay on the full groove !!
From Clevite ...
First, it’s essential to understand that bearings depend on a film of oil to keep them separated from the shaft surface. This oil film is developed by shaft rotation. As the shaft rotates it pulls oil into the loaded area of the bearing and rides up on this film much like a tire hydroplaning on wet pavement. Grooving in a bearing acts like tread in a tire to break up the oil film. While you want your tires to grip the road, you don’t want your bearings to grip the shaft. The primary reason for having any grooving in a main bearing is to provide oil to the connecting rods. Without rod bearings to feed, a simple oil hole would be sufficient to lubricate a main bearing. Many early engines used full grooved bearings and some even used multiple grooves. As engine and bearing technology developed, bearing grooving was removed from modern lower main bearings. The result is in a thicker film of oil for the shaft to ride on. This provides a greater safety margin and improved bearing life. Upper main shells, which see lower loads than the lowers, have retained a groove to supply the connecting rods with oil. In an effort to develop the best possible main bearing designs for performance engines, we’ve investigated the effects of main bearing grooving on bearing performance. The graphs on the next page illustrate that a simple 180° groove in the upper main shell is still the best overall design. While a slightly shorter groove of 140° provides a marginal gain, most of the benefit is to the upper shell, which doesn’t need improvement. On the other hand, extending the groove into the lower half, even as little as 20° at each parting line (220° in total), takes away from upper bearing performance without providing any benefit to the lower half. It’s also interesting to note that as groove length increases so do Horsepower Loss and Peak Oil Film Pressure which is transmitted directly to the bearing.
I use the Clevite full groove bearings....???
If you like drag racing, support your local track.
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Re: Crank Bearings what to use?
[Re: Monte_Smith]
#920461
02/04/11 10:26 PM
02/04/11 10:26 PM
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Joined: Jan 2003
Posts: 4,616 Kissimmee Fl.
dusturbd340W5
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I run the clevite H series in my 416 they are a half groove I spin this motor to 7500 on a regular basis and I looked at the mains after 125 passes and the bearings and crank still look new I see no reason to worry about having a full groove if everything else is correct.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: Crank Bearings what to use?
[Re: tjmarcus1]
#920463
02/04/11 11:19 PM
02/04/11 11:19 PM
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Joined: Aug 2003
Posts: 1,123 Seaford Delaware
JSR1485
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Is it also good to use -.001 bearings for better clearance also? This is what a friend always uses.
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Re: Crank Bearings what to use?
[Re: JSR1485]
#920465
02/04/11 11:38 PM
02/04/11 11:38 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Is it also good to use -.001 bearings for better clearance also? This is what a friend always uses.
Maybe if your on the tighter side but if you set the crank for the the looser side you wont need those... I set everything at .003... and I've been running a 1/2 groove for a long time... just like that article said... I want the larger load carrying area
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