This may sound like a dumb question, but I had to get chamferred bearings for my 383 buildup and as I was installing the pistons I noticed there are no oil spurt holes in the rod bearings. Is this correct, or did I get a set of bearings which weren't completed? If there is not supposed to be an oil spurt hole in them can someone please explain why? Thanks.

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Riccioli Performance Motorworks

--RPM Racing--

-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, either AFR or Trick Flow heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??


***** Flyby: (n) When you let off the throttle after beating a ***** Racer by a few car lengths and he then blows by you in an attempt to convince you he really won the race.

 

the rod bearings don't have oil holes. they oil from the crank not from the rods.

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ICON Motorsports
1st & 3rd

 

Nope, the oil comes thru the crank to lube the bearings so they float on the oil.

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"I don't want to be right - I just want to know if I'm right"
-Einstein

 

Thanks guys. The first set of bearings I had before I got the chamferred ones had holes right on the side where the bearings connect (opposite the side with the tangs), but the tech guy at Summit told me GM had experimented with these holes a while back. I've still never heard of this though??

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Riccioli Performance Motorworks

--RPM Racing--

-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, either AFR or Trick Flow heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??


***** Flyby: (n) When you let off the throttle after beating a ***** Racer by a few car lengths and he then blows by you in an attempt to convince you he really won the race.

 

Y'know, now that you mention it, I have seen that on a few. It's a hole with the ridge on each side right?

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"I don't want to be right - I just want to know if I'm right"
-Einstein

 

Most bearings don't have that hole any more. Most people don't consider it essential.

Do your rods have the little groove machined across the mating surfaces of the rod and cap? If not, the holes in the bearings won't do anything anyway. If the rods have it but the bearings don't, and you want to supply that extra little shot of oil to the bottom of the piston for the pin, you could file the notch in all the upper halves.

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"So many Mustangs, so little time..."

 

Or you could install all the little 3/64" steel oil lines and distribution blocks like truck and large stationary engines. There is normally PLENTY of oil slinging off the crank throws to lube the undersides of the pistons. This windage is what many of us try to knock down with trays and scrapers/strippers.

Thank goodness for "standard" bearings and synthetic oil.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

You guys can correct me if I'm wrong on this one.

I believe the holes in the rods, which are always to face inward toward the crankshaft, were used to provide oiling to the camshaft lobes.

Small journal 327 rods, as well as some early big block rods and some Pontiac rods had this feature.

The set of small journal rods I'm running in my 415 had them, well at least seven of them did. The eighth one didn't - perhaps because it had been resized which removed the hole - so I just drilled it in.

The Clevite 77 rod bearings I'm using all had the holes at the inboard parting line which matched the locations on both the rod and cap.

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9