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03-04-2006, 01:10 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,162
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Not Ranked
Rod bearing question on 390.
Ok, I have clevite 77 CB 760p .010 under bearings, but looking at my old ones, there's a V notch in the each piece and with the new ones, well, they don't have that notch. Obviously the rods have the notch in them too (I guess for oil evacuation/pressure relief? Anyway, what's the story?
Right ones or wrong ones? On the summitracing site I don't see any other 760 .010 model for clevite, sooooo...????
Thanks for the help. |
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03-04-2006, 01:32 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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On the side of the rod cap mating surface I guess? Some rods have a hole in the rod near the top of the big end for squirting oil up into the piston area. Cooling\lubrication...
It is curious as to what the v notch on a 390 is for, perhaps the same thing?
Last edited by Excaliber; 03-04-2006 at 01:34 PM..
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03-04-2006, 01:57 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,162
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03-04-2006, 02:01 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Brent: Sounds like the V-notch is to match a rod or cap that has a groove across the parting line for squirting oil on the thrust side of the cylinder wall. If your caps or rods aren't grooved, the V-notched inserts are not needed. If they are and your bearings aren't notched, you can always file a notch in them. Just make sure you chamfer the edges.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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03-04-2006, 02:04 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,162
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Tom, it sounds like I need them (see my pics above)? Is there a special part # or what?
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03-04-2006, 02:59 PM
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Senior Club Cobra Member
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Make sure you get the rods facing the right direction when re-installed. Not only for the possible oil squirt effect but because the rod is chamfered on the side the goes against the crank counter weight edge.
Backward installation is known to happen.
Initially on my engine build I put the pistons on backwards to the rod. When I got the rod installed right, the piston was wrong! Arrgggghhhhhh, those piston pin spiral locks are a nightmare to install. 
So you gonna file some notches in the bearings? WHOA, does that sound scary or what! 
Last edited by Excaliber; 03-04-2006 at 03:02 PM..
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03-04-2006, 03:28 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
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Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
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Brett: I'll have to do some research for you. Been out boring holes in the sky this afternoon and heading out to the movies now. I'll check the Ford manual and talk to my BB Ford guru and let you know.
Excaliber: Scary filing notches in bearings? Having massaged a fair number of beairng in race engines, I find it scary only if you don't know what you're doing. With the right info and the right touch, it should be OK. 
We'll get the right info and go from there.
Later.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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03-04-2006, 03:47 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,162
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Thanks for the help guys...More the merrier.  |
03-04-2006, 10:01 PM
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CC Member
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Join Date: Jan 2003
Location: Atlanta,
GA
Cobra Make, Engine: CAV GT40 with 331 KC
Posts: 2,187
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Brent -
I don't think those notches have anything to do with oiling....it does seem that those holes are bigger than normal - is there a locating bushing that fits in there? Are those holes larger than the ones on rods that do not have the notches?
Pat
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03-05-2006, 01:51 AM
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Senior Club Cobra Member
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Join Date: Nov 1999
Location: Folsom,
CA
Cobra Make, Engine: ERA 623, 427 S/C Cobra. Ford FE 428 Cobra Jet, Ford Nascar TL 4speed - with a touch of raw; "less is more" theme
Posts: 3,884
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Brent,
The notches were originally put there by FoMoCo for lubricating the cylinder walls and pistons (squirt splash) with the intent to keep them cooler. It was designed to allow oil to be squirted through it if the matching bearings are used. Apparently, some bearing manufacturers decided to stop making them with squirt holes thinking it was not needed. Also, if they are used as original, it could lower oil pressure. Good Luck.
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Duane
Western States Cobra Group 1998-2016.
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03-05-2006, 06:28 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
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Did you spin a bearing Brent? That cap looks pretty rough....
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03-05-2006, 09:44 AM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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It is the elimination of items such as this that are contributing to the flat tappet cam/lifter failures. Some types rods/engines used these notches, some types used squirter holes in the upper half--you need the oil off the big end of the rod to oil the cam/lifter area, distributer gear, and wrist pin bushing/small end of the rod-have any of these situations bitten any of you guys???
Go and read my responce several days ago about flat tappet/cam failure
Jerry |
03-05-2006, 10:28 AM
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Bearing cap looks OK to me, appears to be just showing the normal markings left from the old rod bearing.
Good point Jerry! I wouldn't worry about loosing oil pressure if indeed that IS a oil squirt hole in the rod.
Last edited by Excaliber; 03-06-2006 at 01:10 AM..
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03-06-2006, 12:01 AM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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Quote:
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Originally Posted by Excaliber
I got squirt holes in the top of my rods and still run 80 psi.
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The hole on the little end is for oil splash to lubricate the piston pin.
While I've seen rod bearings with "V" notches in the indicated location, the pistons & cylinders also get splash from oil running out from between the rods as the shaft rotates. The larger the gap between the rods (usually .025 max) the more splash.
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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03-06-2006, 12:39 AM
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CC Member
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Join Date: Jun 2003
Cobra Make, Engine: ERA 427 w/496 Side Oiler, roller, dual quads
Posts: 417
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I thought you were smart enough to know about the little end hole...
What rods do you have? I haven't seen any with a hole as you describe...just curious.
Dan
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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03-29-2006, 08:35 PM
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Location: West Bloomfield,
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Actually Ford decided not to use those little squirter holes anymore and had both major bearing manufacturers eliminate them as a cost savings measure.
Saving a penny per bearing means a lot when you make a few million of them.
They were designed to squirt oil into the cylinder for skirt lubrication - - and have nothing to do with cam life. The vast majority of the oil sprayed around the crankcase comes through the rods side clearance area, and it is limited by rod bearing clearance. Testing proved that the squirters were not needed - - they were a leftover concept from the 50's when the original design work was done.
Now on a Cup motor they put them back - - in the pan rail...
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