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OIL PATH AMC DISTRIBUTOR GEAR OILING
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RobinPDX View Drop Down
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    Posted: Jan/19/2021 at 4:52pm
Originally posted by PHAT69AMX PHAT69AMX wrote:

The "other side of the coin"...
Guess while we're at it, this also impacts Distributor Drive Gears.
Correct interface between Distributor Shaft and Oil Pump Gear Shaft...
Wish I still had some known factory original parts to measure...
Wonder if Matt at BullTear has any original AMC Engineering Drawings of this area?
An AMC rebuild will replace Oil Pump Gears and often the Distributor.
Resulting in the mating of two new aftermarket non-stock items with possibilities
of incorrect dimensions and/or fit or interference in the below circled areas.
Compounded even further when the Timing Chain Cover is replaced. 
Square Corners can run up against radius of machining preventing proper engagement.
Causing Oil Pump, Distributor, and Distributor Drive Gear problems... And...
this interface is "hidden" once the Distributor Drive Gear is installed on the shaft!
All new parts must be on-hand and trial assembled well before doing final assembly.
Your all's thoughts? 

Very excellent point to verify on the whole topic of cam gear oiling  / TC Mod correction issues!






Edited by RobinPDX - Jan/19/2021 at 4:54pm
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  ( Full Groove front most cam bearing and or journal !)                                  All front cam bearings had a grove in them  The early camshafts ( 66 early 68 ) did not have a grove in the front cam journal. The first couple yrs. they had a lube problem with the Cam and Dist. gears. There was a Field Fix from the dealers to tee a oil line from the pressure switch to the front cover to get more lube to the gears. All 68 and up  cams had a grove in the front journal.   NOW 50 plus yrs. later there is a mix of flat tappet cams that do not have the front journal grove. All of the roller cams I've seen DO NOT have the grove.
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Points: 5919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Nov/01/2019 at 12:34pm
This is just a drawing I know, and rotated into position in PowerPoint to create this image,
but it gives some general idea of the amount of slope in the stock cyl head oil drain back holes
and just how shallow, or just how little slope, there actually is in those drainback passages.
I'm fairly confident this is correct, 45 deg block deck surface, cyl head drawing oriented as-if on block.




Edited by PHAT69AMX - Nov/01/2019 at 12:36pm


Link to a Short YouTube Burnout Video
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Hurst390 View Drop Down
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Originally posted by bwamx bwamx wrote:

Are those oil drain back lines from the valve covers
On the drivers side of the oil pan? We use to run those along with a Similar home made oil pan on a IMSA hornet before going to a  sump system. 
Yes 1 rear on each head and one on right front
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Points: 143 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bwamx Quote  Post ReplyReply Direct Link To This Post Posted: Oct/30/2019 at 7:23pm
Are those oil drain back lines from the valve covers
On the drivers side of the oil pan? We use to run those along with a Similar home made oil pan on a IMSA hornet before going to a  sump system. 
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Hurst390 do you run a pan with more volume, something like the Canton road race/street oil pan, or if you have something you made can you describe it?
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Originally posted by Hurst390 Hurst390 wrote:

I've never blown up an AMC going around corners with a wet sump pan.


Penske racing blew up Traco built AMC engines back in 1970.

Tha was before Traco figured it out and SCCA allowed dry sump oiling.
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I've never blown up an AMC going around corners with a wet sump pan.
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Points: 5122 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Oct/29/2019 at 7:03pm
Originally posted by PHAT69AMX PHAT69AMX wrote:

72POS has videos posted on his FaceBook page of his highly modified AMC race motor
running and looking down in the Valve Cover Breather Holes and you would NOT BELIEVE
the amount of OIL circulating around inside those Valve Covers !
Those 2 Oil Drain Back Holes on the corners of the Heads must just be very restrictive relatively.
And they drain into the Lifter Valley -NOT- the Oil Pan...
and the "path" from head to valley is kinda of a more Horizontal flow path than vertical...
Plus all Hydraulic Lifters are -NOT- created equal and who knows just how much
volume of OIL is pumped up top by whatever brand current replacement lifter from the myriad of manufacturers
compared to the volume of oil pumped up onto the heads by stock original AMC Hydraulic Lifters ?...



I did this type of testing a few years ago when I was chasing an oil pressure problem. Running the oil pump with a drill won't flow as much as if the engine were running for a couple of reasons. One reason is the oil is cold and thick when using a drill. Another is since things aren't moving feed holes aren't moving around and being lined up with the pressurized oil feeds during rotation.

For my testing I looked at the drainback paths in the heads as well as how much was flowing past the crank bearings. Got video of running engine valvetrain oiling and drill driven pump valvetrain and crank bearings.

Instead of restricting the oil feed in the block I used restrictive pushrods. Easier to change if need be.

-Steve-
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