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Re: full groove main bearings???
[Re: CraigS]
#1210943
04/06/12 02:45 PM
04/06/12 02:45 PM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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I'm currently running full groove bearings in my small block, all the oil feed holes in the bearings elongated and all the oil passages opened up to a 1/2" with a HV oil pump. With 05W20 dino oil in it I have just a tick over 60 psi at 7000 in the lights. I know there is a lot oil flowing through the engine so I'm not worried about it but will probably switch to 10W30 when I put the synthetic in it.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: full groove main bearings???
[Re: CraigS]
#1210944
04/06/12 02:50 PM
04/06/12 02:50 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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A full grove bearing also takes away load carrying surface area... a guy I know use to build F1 engines and he said all that you need max is 5/8 of the total diameter 
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Re: full groove main bearings???
[Re: CraigS]
#1210945
04/06/12 04:32 PM
04/06/12 04:32 PM
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Joined: Aug 2003
Posts: 43,173
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
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Quote:
hey folks,
What are the advantages/disadvantages of full groove main bearings in my 440?I am changing mine ,and the old bearings were half groove,wheras the new ones are full groove? What can I expect the difference in oil pressure to be?Are the full groove more or less reliable?I have not read about this anywhere,I ordered new bearings from mancini ,and these are the ones I got,but they are different And was wondering if this is a mistake ?
Half groove main bearings oil the rods for half of the the stroke, starve the rods of oil during the other half of the stroke,AKA crankshaft rotation  There are several different versions and brands of full groove main bearings, race bearings with wide grooves in both Babbit and Tri metal and HD truck bearings with narrow grooves  I like and use the HD narrow full groove Seal Power brand main bearings   As far as oil pressure differences, there is probally a small amount of pressure loss  I like to keep my bearings oiled, at all times and at all RPM, especailly above 5000 RPM, which is 83 crankshaft revolutions per second
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: full groove main bearings???
[Re: Cab_Burge]
#1210947
04/06/12 07:50 PM
04/06/12 07:50 PM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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Quote:
Half groove main bearings oil the rods for half of the the stroke, starve the rods of oil during the other half of the stroke,AKA crankshaft rotation
That is why I don't run half groove main bearings in my race engine. IMO, the rod bearings need the oil in this application. I haven't seen any issue with "less load bearing area" in bracket engines under 900 hp.
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Re: full groove main bearings???
[Re: 440Jim]
#1210948
04/06/12 08:07 PM
04/06/12 08:07 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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1/2 grove beaings in mine. More surface for the shock load of nitrous. Go through the traps 7500 no problems.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: full groove main bearings???
[Re: ahy]
#1210950
04/06/12 08:16 PM
04/06/12 08:16 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I've been running 1/2 groove bearings for years... been as high as 9600 rpm and never spun a bearing (knock on wood now...lol)
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Re: full groove main bearings???
[Re: CraigS]
#1210951
04/07/12 01:30 AM
04/07/12 01:30 AM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Look around for what the bearing manufacturers say.
Or, I'll save you the trouble: "Don't".
Boffin Emeritus
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Re: full groove main bearings???
[Re: Cab_Burge]
#1210955
04/07/12 10:54 AM
04/07/12 10:54 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Half groove main bearings oil the rods for half of the the stroke, starve the rods of oil during the other half of the stroke,AKA crankshaft rotation What happened to the .003 bearing clearance during the other half of the stroke... it still has oil in the gap and is still flowing... the high flow area in the bearing is cooling time... and in a drag engine we dont build all that much heat....... JMO
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Re: full groove main bearings???
[Re: polyspheric]
#1210956
04/07/12 11:03 AM
04/07/12 11:03 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
Look around for what the bearing manufacturers say.
Or, I'll save you the trouble: "Don't".
that's fine and dandy, to want to run "stock" half groove bearings.
but I ordered stock replacement bearings from Clevite for a 360. I was sent full groove bearings.
When I called to ask about it, they told me they don't make "half groove bearings" because they "saw an opportunity to improve the factory design and did it"
they told me they didn't even OFFER stock type, half groove bearings anymore, but to not worry because their full groove bearings are superior to factory type.
What I think happened, was they saw a cost cutting opportunity, and stopped making the half of the bearing that did not have a groove in it, and decided it was cheaper to simply make 1 style of bearing half, that included the oil groove and the hole for the oil passage.
**Photobucket sucks**
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Re: full groove main bearings???
[Re: 70Cuda383]
#1210957
04/07/12 12:02 PM
04/07/12 12:02 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
When I called to ask about it, they told me they don't make "half groove bearings" because they "saw an opportunity to improve the factory design and did it"
that seems odd given that they were the ones that did a fair bit of research and according to them the 180° is a better design than full groove.
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Re: full groove main bearings???
[Re: Cab_Burge]
#1210960
04/07/12 03:34 PM
04/07/12 03:34 PM
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Joined: Jun 2007
Posts: 103
NEW JERSEY
BIGSPEED
member
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member
Joined: Jun 2007
Posts: 103
NEW JERSEY
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Quote:
Quote:
The Hemi 99 Prostock main bearings are half grooved as are all the mains in Nascar Cup racing.Bill C.
I wonder if the cranks in them are cross drilled for full time oiling like any r ace engines crankshafts are?
No crossdrilling is no longer used right along side full grooved main bearings. Technology marches on .Bill C.
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