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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636313
06/21/14 12:27 PM
06/21/14 12:27 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
OP
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OP
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Ontario Canada
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The only difference in these cranks (oiling) is that the mains on the 5.7 are drilled straight through. Plus there is little to no chamfer around the hole. Now I'm no expert but why would this be an issue.  The cross drilling seems to be the same. Matt
Last edited by MattW; 06/21/14 12:34 PM.
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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636314
06/21/14 12:39 PM
06/21/14 12:39 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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Quote:
The only difference in these cranks (oiling) is that the mains on the 5.7 are drilled straight through. Plus there is little to no chamfer around the hole.
Now I'm no expert but why would this be an issue.
The cross drilling seems to be the same.
Matt
I'm no pro either but I like to see a decent champfer
on the holes... to me it spreads the oil easier..
maybe some of the pros will comment
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Re: 360 and 5.7 crank pics
[Re: MR_P_BODY]
#1636315
06/21/14 03:12 PM
06/21/14 03:12 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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I tend to agree with some; that the opposite centrifugal force keeps oil from getting to the rods.
Yeah, it's got a smallblock.
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Re: 360 and 5.7 crank pics
[Re: 340B5]
#1636316
06/21/14 04:30 PM
06/21/14 04:30 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
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OP
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Quote:
I tend to agree with some; that the opposite centrifugal force keeps oil from getting to the rods.
OK so lets say that this is true. Then wouldn't the oil act like a dam and force oil to the rods correct. This is under 60 psi.
As previously mentioned the only differences between the two are that the crank is that the 5.7 is drilled straight through on the mains.
Not trying to be an A$$ just trying to understand.
Matt
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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636317
06/21/14 05:13 PM
06/21/14 05:13 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Being that both holes are the same distance from the center line they will both have the same force on them but 180* out... I think the idea was they could oil the bearings more(rod bearings)... but from what others have said, the rods are the weak link in the bottom end.. so MAYBE the opposite hole is picking up air (guess on my part)
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Re: 360 and 5.7 crank pics
[Re: MR_P_BODY]
#1636319
06/21/14 06:01 PM
06/21/14 06:01 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
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Quote:
Being that both holes are the same distance from the
center line they will both have the same force on them
but 180* out... I think the idea was they could oil the
bearings more(rod bearings)... but from what others
have said, the rods are the weak link in the bottom
end.. so MAYBE the opposite hole is picking up air
(guess on my part)
Thats something I havent thought about. 
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Re: 360 and 5.7 crank pics
[Re: 340B5]
#1636320
06/21/14 06:05 PM
06/21/14 06:05 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
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Quote:
Quote:
Quote:
I tend to agree with some; that the opposite centrifugal force keeps oil from getting to the rods.
OK so lets say that this is true. Then wouldn't the oil act like a dam and force oil to the rods correct. This is under 60 psi.
As previously mentioned the only differences between the two are that the crank is that the 5.7 is drilled straight through on the mains.
Not trying to be an A$$ just trying to understand.
Matt
I see what you are thinking and agree that not much would flow out of the thru-drilled main when the hole is not opened to the rod, but it's the weight of the oil on both sides of the CL of the crank(in the main) that pull the oil in 2 directions at once, cancelling out each other. Then when the oil holes align to the rod, there is very limited time for the oil to overcome that force and escape to the rod.
After reading what I have on these engines, I would find an aftermarket crank if I was going to spin it over 6K.
Hope this explains my way of thinking.
I see what your trying to explain. So if someone would plug the hole from the mains and just leave it open for the rods this would be exactly what the LA crank would have.
I wonder if this would work?
I plan on testing this theory in the fall with a junkyard 5.7. If my friend is willing to help me.
Matt
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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636321
06/21/14 06:11 PM
06/21/14 06:11 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I see what your trying to explain. So if someone would plug the hole from the mains and just leave it open for the rods this would be exactly what the LA crank would have. I wonder if this would work? I plan on testing this theory in the fall with a junkyard 5.7. If my friend is willing to help me. Matt
IMO .. that would be a very good test.. and I think
the results would be positive
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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636323
06/21/14 06:25 PM
06/21/14 06:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Romeo MI
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I think that if you press in a plug it would stay even without a tac weld due to it being so close to center.. maybe about .002-.003 press fit
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Re: 360 and 5.7 crank pics
[Re: MR_P_BODY]
#1636324
06/21/14 06:33 PM
06/21/14 06:33 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
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master
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Milwaukee WI
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I'd feel a bit safer with threads. I realize that the sharp edges of threads would create stress risers though. Even being close to the c/l, you still have oil press, heat and some flex cycles in that area. Just my  , but I agree with the basic theory on the oiling issue.
"use it 'till it breaks, replace as needed"
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Re: 360 and 5.7 crank pics
[Re: TRENDZ]
#1636326
06/21/14 06:45 PM
06/21/14 06:45 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
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Milwaukee WI
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After looking at the pics again, I dont think you could do this.
Without the crank here to look at, it seems that the main journal would need to feed one rod on either side of the journal. My guess is that the intersect point for these would be to close together to separate the oil circuits. Without actually having it it's hard to tell.
"use it 'till it breaks, replace as needed"
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Re: 360 and 5.7 crank pics
[Re: TRENDZ]
#1636327
06/21/14 06:51 PM
06/21/14 06:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Quote:
I'd feel a bit safer with threads. I realize that the sharp edges of threads would create stress risers though.
Even being close to the c/l, you still have oil press, heat and some flex cycles in that area. Just my , but I agree with the basic theory on the oiling issue.
Being on the mains the flex should be at a minimum
and with .002-.003 press it shouldnt even move....003
is a TIGHT press and might not be possible without
issues... might need to be polished by a crank shop..
he could tig tack it and then have it polished (it would
need to be pushed in below the surface)... I use to tack
weld some cranks for a shop that put the heavy metal
in on the OD of the counter weights and they didnt move
(they did it that way because of the location that
needed the weight)
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Re: 360 and 5.7 crank pics
[Re: 340B5]
#1636328
06/21/14 06:58 PM
06/21/14 06:58 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
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master
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Milwaukee WI
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Well, if you were only trying to plug one hole, you could drill the feed side larger, stop past the intersect point, and install the press in plug from the "safe" side. But then, the "dummy" hole would still apply oil pressure when the main saddle lines up.
Do these things have fully grooved mains?
I would really like to see an oiling diagram of these engines.
"use it 'till it breaks, replace as needed"
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Re: 360 and 5.7 crank pics
[Re: TRENDZ]
#1636329
06/21/14 07:10 PM
06/21/14 07:10 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
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Quote:
Well, if you were only trying to plug one hole, you could drill the feed side larger, stop past the intersect point, and install the press in plug from the "safe" side. But then, the "dummy" hole would still apply oil pressure when the main saddle lines up.
Do these things have fully grooved mains?
I would really like to see an oiling diagram of these engines.
The one I pulled part had 1/2 grooved mains.
Don't know if I'm reading you right but my pressed pin would allow oil to both sids of the crank. I would just eliminate the drilled centre.
I would also open up all the cross drilled and mains to 1/4 inch.
I believe the oiling system goes this way.
Oil pick up to filter to crank. Crank to cam, cam to heads, heads to lifters.
Matt
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Re: 360 and 5.7 crank pics
[Re: MattW]
#1636330
06/21/14 07:20 PM
06/21/14 07:20 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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I think I would always use a Wix racing filter.. they dont filter the smaller partials BUT they also by pass sooner which would supply oil at all times... JMO
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