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Side clearence alloy rods, how much?
#980096
04/25/11 05:58 AM
04/25/11 05:58 AM
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Joined: Sep 2003
Posts: 1,260
Netherlands
72Challenger
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Netherlands
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Hi guys and galls. I'm currently checking out an 400 -> 500ci halffilled engine with new bme alloy rods in it and seem to have a lot of side play. For an approx 800hp street strip engine with tge rods torqued down how much clearence would you consider either optimal and max? Measured cold of course...
All opinions appreciated!
Thanks!
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Re: Side clearence alloy rods, how much?
[Re: gregsdart]
#980099
04/25/11 12:32 PM
04/25/11 12:32 PM
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Joined: Sep 2003
Posts: 1,260
Netherlands
72Challenger
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Thanks so far guys. The minimum is not my concern, it's the maximum this time. Have to take a closer look with a correct feeler gauge but if seems to be more around .06
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Re: Side clearence alloy rods, how much?
[Re: dthemi]
#980101
04/27/11 05:35 AM
04/27/11 05:35 AM
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Joined: Sep 2003
Posts: 1,260
Netherlands
72Challenger
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Thanks guys! Time to close it all up and put it in the car this weekend.
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Re: Side clearence alloy rods, how much?
[Re: dthemi]
#980103
04/27/11 08:09 PM
04/27/11 08:09 PM
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Joined: Aug 2003
Posts: 1,313
Charlotte, NC
LSP
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Quote:
.06 wont hurt a thing, .02-.03 would be better for the oil that gets flung, but no problem.
Can you explain this please?
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Re: Side clearence alloy rods, how much?
[Re: LSP]
#980104
04/27/11 08:17 PM
04/27/11 08:17 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Quote:
.06 wont hurt a thing, .02-.03 would be better for the oil that gets flung, but no problem.
Can you explain this please?
I think that you will wind-up with 30 with alum rods when they warm-up.
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Re: Side clearence alloy rods, how much?
[Re: LSP]
#980105
04/27/11 08:23 PM
04/27/11 08:23 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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master
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nc
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Quote:
Quote:
.06 wont hurt a thing, .02-.03 would be better for the oil that gets flung, but no problem.
Can you explain this please?
I think the theory here is the larger the side clearance the more oil will sling off the crank adding to windage drag,
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Re: Side clearence alloy rods, how much?
[Re: emarine01]
#980106
04/27/11 08:44 PM
04/27/11 08:44 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
I think the theory here is the larger the side clearance the more oil will sling off the crank adding to windage drag,
NOT a theory ....it beez a fact ! ....some of the PROS run as small as 007 with steel rods.
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Re: Side clearence alloy rods, how much?
[Re: dOrk !]
#980107
04/27/11 08:56 PM
04/27/11 08:56 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
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master
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Posts: 3,695
nc
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Quote:
Quote:
I think the theory here is the larger the side clearance the more oil will sling off the crank adding to windage drag,
NOT a theory ....it beez a fact ! ....some of the PROS run as small as 007 with steel rods.
I know Doc... I was just covering my ass 
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Re: Side clearence alloy rods, how much?
[Re: dOrk !]
#980108
04/29/11 07:42 AM
04/29/11 07:42 AM
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Joined: Aug 2003
Posts: 1,313
Charlotte, NC
LSP
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pro stock
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Quote:
Quote:
I think the theory here is the larger the side clearance the more oil will sling off the crank adding to windage drag,
NOT a theory ....it beez a fact ! ....some of the PROS run as small as 007 with steel rods.
The oil "slinging" from the rods is metered by rod bearing clearance, .010", .020", .040", or .060" rod side clearance won't change the oil flow one bit.
Who's the "PROS" that run .007" rod side clearance?
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Re: Side clearence alloy rods, how much?
[Re: dOrk !]
#980111
04/30/11 08:39 AM
04/30/11 08:39 AM
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Joined: Aug 2003
Posts: 1,313
Charlotte, NC
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Quote:
This topic is never going to be laid-to-rest ..... 
Bearing and rod-side clearances ? .... ALL of this is a "leak" in the chain. For someone to say that there is no diff in this RSC "leak" between 10 and 60 ....... is uNsane ! 
WHO was talking about 007 ? .... WJ. And IIRC ...from that article ... he ran a steel rod motor at 11 all the time.
Rod vertical bearing clearance is what meters oil flow, not the side clearance... not today, not tomorrow, not ever.
Don't believe everything you read, WJ does not have any steel rod motors.
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Re: Side clearence alloy rods, how much?
[Re: dOrk !]
#980113
04/30/11 01:21 PM
04/30/11 01:21 PM
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Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
gregsdart
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master
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Frostbitefalls MN (Rocky&Bullw...
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Its pretty simple, really. There will be some restriction if you run them tight. But guys run them with far more than what will provide any restriction what so ever. If you have a .003 bearing clearance, then .003 extra(or slightly more) side clearance will give you as much room for the oil to escape as a larger clearance will. With folks running them very loose as with stock width BBC rods on stock width mopar journals, it must be apparent that the increase in oil flow isn't enough for most of us to worry about. It probably will show up on a dyno, but I wouldn't want to spend the time or money figuring out how close i could run them before disaster strikes. It would probably come from bind between rods, not an oiling issue.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Side clearence alloy rods, how much?
[Re: dthemi]
#980115
04/30/11 02:28 PM
04/30/11 02:28 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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Large rod side clearance is not gonna hurt anything other than as pointed out windage and oil that ends up in suspension. As DT pointed out .060" aint gonna hurt nothing othen and having more oil in suspension in the crankcase.
But hey I am not a Barton what do I know...
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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